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Surface Displacements Mechanism of the Dobi Graben from ASAR Time-Series Analysis of InSAR: Implications for the Tectonic Setting in the Central Afar Depression, Ethiopia. REMOTE SENSING 2022. [DOI: 10.3390/rs14081845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The Dobi graben is a Quaternary, NW-trending continental rift found within the East-Central Block (ECB) of the Afar Depression (AD) in Ethiopia. The AD might be the only place where three active rifts meet on land. This diffused, Rift–Rift–Rift (RRR) triple junction in the ECB comprises the overlap zone between the Red Sea and the Gulf of Aden propagators. Rifting is ongoing in the Dobi graben as evidenced by the August 1989 earthquakes (of magnitude 5.7 < MW < 6.2). This study carried out a surface displacement time-series analysis to examine the kinematics of the Dobi graben and the surrounding area using 18 ascending orbit scenes (between May 2005 and March 2010) along tract 257 and 15 along the descending orbit (tract 006) of the Advanced Synthetic Aperture Radar (ASAR), C-band (λ = 5.6 cm) acquired by the ENVIronmental SATellite (ENVISAT). We utilized the Small Baseline Algorithm (SBA) techniques of the distributed scatterer, which were implemented independently to generate Line of Sight (LOS) displacement maps. These LOS displacement surface movements, identified in both geometries, can be interpreted as ± signs of predominantly vertical movement in both geometries: positive for uplifting and negative for subsidence. Additionally, opposite signs of ± horizontal movement in both geometries indicate that the movement is from East to West (or vice versa). Results from the velocity and displacement maps and time series analysis suggest that creeping is associated mainly with normal faulting and could be the primary mechanism for strain distribution for the Southeastern part of the Dobi graben. The anomalous, continuous uplifting exhibited at the rift shoulder and in the horst area might be linked to the presence of temporary reactivation of normal faulting in the region. The oblique, positive LOS signals observed in different parts of the Dobi graben might serve as a proxy for understanding how strain is accommodated as normal faulting and is distributed in a distinct northeast direction. This explanation supports both the arguments for the Northeast migration of the triple junction and the transfer of strain from the southernmost Red Sea Rift (RSR) to the Central AD.
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Awaleh MO, Boschetti T, Adaneh AE, Chirdon MA, Ahmed MM, Dabar OA, Soubaneh YD, Egueh NM, Kawalieh AD, Kadieh IH, Chaheire M. Origin of nitrate and sulfate sources in volcano-sedimentary aquifers of the East Africa Rift System: An example of the Ali-Sabieh groundwater (Republic of Djibouti). THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 804:150072. [PMID: 34509848 DOI: 10.1016/j.scitotenv.2021.150072] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 08/28/2021] [Accepted: 08/28/2021] [Indexed: 06/13/2023]
Abstract
Within the East African Rift System (EARS), the complex Ali-Sabieh aquifers system, located in the south of the Republic of Djibouti, was overexploited and subjected to anthropogenic and/or geogenic pollution with high concentrations of dissolved nitrate (up to 181 mg/l) and sulfates (up to 1540 mg/l). This study is the first undertaken on the hydrochemistry of this aquifer system, combining geochemical tools and multi-isotope - δ2H(H2O), δ18O(H2O), δ18O(SO4), δ34S(SO4), δ15N(NO3), δ18O(NO3), δ13C(DIC), and 14C- was used to decipher the origin and fate of different nitrate and sulfate sources to groundwater. The groundwater samples of the region show a chemical evolution from fresh Ca(Na)-bicarbonate to brackish Na-Cl , mainly due to water-rock interaction. The combined chloride and water isotope data show that evaporation and transpiration are present, with the latter occurring primarily in the shallow alluvial aquifer waters. Inspection of δ15N(NO3) vs. δ18O(NO3) and NO3/Cl vs. Cl diagrams show that dissolved nitrates are primarily of anthropogenic origin. In particular, higher nitrate concentrations may be related to animal manure used as organic fertilizers during agricultural activities. Sulfates are from a natural origin related to the interaction of water with gypsum of hydrothermal or sedimentary origin. SO4/Cl ratio and isotopic composition show that dissolved sulfates in saline and ancient groundwater of the Cretaceous sandstone aquifer (between 7.4 ± 2.2 and 5.8 ± 1.4 k-years before the present) are generated by interaction with gypsum from oxidation of pre-existing (Jurassic?) sulfides. This work highlight that isotopic ratios of the two molecules -δ18O(SO4), δ34S(SO4), δ15N(NO3), δ18O(NO3)- are not sufficient for tracing the origin of nitrate and sulfates in groundwater, but that a complete hydrogeochemical study is needed. In the absence of this, the relatively high concentration of chloride and sulfates could be wrongly linked to the anthropogenic source of nitrate (manure or sewage).
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Affiliation(s)
- Mohamed Osman Awaleh
- Institut des Sciences de la Terre, Centre d'Etudes et de Recherches de Djibouti (CERD), Route de l'aéroport, B. P. 486, Djibouti ville, Djibouti.
| | - Tiziano Boschetti
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 157/a, 43124 Parma, Italy
| | - Abdillahi Elmi Adaneh
- Institut des Sciences de la Terre, Centre d'Etudes et de Recherches de Djibouti (CERD), Route de l'aéroport, B. P. 486, Djibouti ville, Djibouti
| | - Mahamoud Ali Chirdon
- Institut des Sciences de la Terre, Centre d'Etudes et de Recherches de Djibouti (CERD), Route de l'aéroport, B. P. 486, Djibouti ville, Djibouti
| | - Moussa Mahdi Ahmed
- Institut des Sciences de la Terre, Centre d'Etudes et de Recherches de Djibouti (CERD), Route de l'aéroport, B. P. 486, Djibouti ville, Djibouti
| | - Omar Assowe Dabar
- Institut des Sciences de la Terre, Centre d'Etudes et de Recherches de Djibouti (CERD), Route de l'aéroport, B. P. 486, Djibouti ville, Djibouti
| | - Youssouf Djibril Soubaneh
- Département de biologie, chimie et géographie, Université du Québec à Rimouski, 300, Allée des Ursulines, Rimouski, QC G5L 3A1, Canada
| | - Nima Moussa Egueh
- Institut des Sciences de la Terre, Centre d'Etudes et de Recherches de Djibouti (CERD), Route de l'aéroport, B. P. 486, Djibouti ville, Djibouti
| | - Ali Dirir Kawalieh
- Institut des Sciences de la Terre, Centre d'Etudes et de Recherches de Djibouti (CERD), Route de l'aéroport, B. P. 486, Djibouti ville, Djibouti
| | - Ibrahim Houssein Kadieh
- Laboratoire Régional, Newalta Châteauguay, 125 Rue Bélanger, Châteauguay, J6J 4Z2, Québec, Canada
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Economic Feasibility of Green Hydrogen Production by Water Electrolysis Using Wind and Geothermal Energy Resources in Asal-Ghoubbet Rift (Republic of Djibouti): A Comparative Evaluation. ENERGIES 2021. [DOI: 10.3390/en15010138] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The Republic of Djibouti has untapped potential in terms of renewable energy resources, such as geothermal, wind, and solar energy. This study examines the economic feasibility of green hydrogen production by water electrolysis using wind and geothermal energy resources in the Asal–Ghoubbet Rift (AG Rift), Republic of Djibouti. It is the first study in Africa that compares the cost per kg of green hydrogen produced by wind and geothermal energy from a single site. The unit cost of electricity produced by the wind turbine (0.042 $/kWh) is more competitive than that of a dry steam geothermal plant (0.086 $/kWh). The cost of producing hydrogen with a suitable electrolyzer powered by wind energy ranges from $0.672/kg H2 to $1.063/kg H2, while that produced by the high-temperature electrolyzer (HTE) powered by geothermal energy ranges from $3.31/kg H2 to $4.78/kg H2. Thus, the AG Rift area can produce electricity and green hydrogen at low-cost using wind energy compared to geothermal energy. The amount of carbon dioxide (CO2) emissions reduced by using a “Yinhe GX113-2.5MW” wind turbine and a single flash geothermal power plant instead of fuel-oil generators is 2061.6 tons CO2/MW/year and 2184.8 tons CO2/MW/year, respectively.
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Active Fault Systems in the Inner Northwest Apennines, Italy: A Reappraisal One Century after the 1920 Mw ~6.5 Fivizzano Earthquake. GEOSCIENCES 2021. [DOI: 10.3390/geosciences11030139] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Based on the review of the available stratigraphic, tectonic, morphological, geodetic, and seismological data, along with new structural observations, we present a reappraisal of the potential seismogenic faults and fault systems in the inner northwest Apennines, Italy, which was the site, one century ago, of the devastating Mw ~6.5, 1920 Fivizzano earthquake. Our updated fault catalog provides the fault locations, as well as the description of their architecture, large-scale segmentation, cumulative displacements, evidence for recent to present activity, and long-term slip rates. Our work documents that a dense network of active faults, and thus potential earthquake fault sources, exists in the region. We discuss the seismogenic potential of these faults, and propose a general tectonic scenario that might account for their development.
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New Insights into Hydrothermal Fluid Circulation Affected by Regional Groundwater Flow in the Asal Rift, Republic of Djibouti. ENERGIES 2021. [DOI: 10.3390/en14041166] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The Asal Rift hosts a lake located in a depression at 150 m below sea level, where recharge is influenced by regional groundwater flow interacting with the Ghoubbet Sea along the coast of Djibouti. This regional groundwater flow is believed to influence hydrothermal fluid circulation, which we aim to better understand in this study, having the objective of developing concepts for geothermal exploration in the area. To this end, magnetotelluric data acquired in the Asal Rift were processed and analyzed. 1D inversion models of electrical conductivity were interpolated for interpretation. These data were then used to build a 2D hydrogeological model, allowing multiphase flow and heat transfer simulations to be performed, considering the regional groundwater flow near the surface and the site topography, in order to confirm the preferred path of fluid flow. Geophysical data analysis indicates the presence of normal faults, notably the H fault, which may act as a conduit for the circulation of hydrothermal fluids and where the hanging wall can be a hydrogeological barrier within the hydrothermal system of the Asal Rift. The results from the 2D numerical flow and heat transfer modelling show the importance of groundwater flow responsible for thermal springs located at the periphery of Asal Lake. Reservoir temperature inferred by means of geothermometry ranging from 200 to 270 °C was shown to correspond to simulated temperature at potential reservoir depth. Moreover, simulated temperature between 600 and 1700 m depth is close to the temperature profile measured in the geothermal well Asal 6 of the area, with less than 20 °C difference. Simulations indicate that hydrothermal fluid circulation is likely influenced by the regional groundwater flow controlled by the topography and the major water bodies, the Ghoubbet Sea and Asal Lake, feeding buoyant fluids interacting with a deep magmatic source and where tectonic activity created normal faults offering a preferred path for fluid circulation.
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Shi X, Tapponnier P, Wang T, Wei S, Wang Y, Wang X, Jiao L. Triple junction kinematics accounts for the 2016 M w 7.8 Kaikoura earthquake rupture complexity. Proc Natl Acad Sci U S A 2019; 116:26367-26375. [PMID: 31822611 PMCID: PMC6936559 DOI: 10.1073/pnas.1916770116] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The 2016, moment magnitude (Mw) 7.8, Kaikoura earthquake generated the most complex surface ruptures ever observed. Although likely linked with kinematic changes in central New Zealand, the driving mechanisms of such complexity remain unclear. Here, we propose an interpretation accounting for the most puzzling aspects of the 2016 rupture. We examine the partitioning of plate motion and coseismic slip during the 2016 event in and around Kaikoura and the large-scale fault kinematics, volcanism, seismicity, and slab geometry in the broader Tonga-Kermadec region. We find that the plate motion partitioning near Kaikoura is comparable to the coseismic partitioning between strike-slip motion on the Kekerengu fault and subperpendicular thrusting along the offshore West-Hikurangi megathrust. Together with measured slip rates and paleoseismological results along the Hope, Kekerengu, and Wairarapa faults, this observation suggests that the West-Hikurangi thrust and Kekerengu faults bound the southernmost tip of the Tonga-Kermadec sliver plate. The narrow region, around Kaikoura, where the 3 fastest-slipping faults of New Zealand meet, thus hosts a fault-fault-trench (FFT) triple junction, which accounts for the particularly convoluted 2016 coseismic deformation. That triple junction appears to have migrated southward since the birth of the sliver plate (around 5 to 7 million years ago). This likely drove southward stepping of strike-slip shear within the Marlborough fault system and propagation of volcanism in the North Island. Hence, on a multimillennial time scale, the apparently distributed faulting across southern New Zealand may reflect classic plate-tectonic triple-junction migration rather than diffuse deformation of the continental lithosphere.
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Affiliation(s)
- Xuhua Shi
- School of Earth Sciences, Zhejiang University, 310027 Hangzhou, China
- Research Center for Structures in Oil- and Gas-Bearing Basins, Ministry of Education, 310027 Hangzhou, China
| | - Paul Tapponnier
- Key Laboratory of Crustal Dynamics, Institute of Crustal Dynamics, China Earthquake Administration, 100085 Beijing, China
| | - Teng Wang
- School of Earth and Space Sciences, Peking University, 100871 Beijing, China
| | - Shengji Wei
- Earth Observatory of Singapore, Nanyang Technological University, Singapore 639798, Singapore
| | - Yu Wang
- Department of Geosciences, National Taiwan University, 10617 Taipei, Taiwan
| | - Xin Wang
- Seismological Laboratory, California Institute of Technology, Pasadena, CA 91125
| | - Liqing Jiao
- Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, UMR 7154 CNRS, 75005 Paris, France
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Bonatti E, Gasperini E, Vigliotti L, Lupi L, Vaselli O, Polonia A, Gasperini L. Lake Afrera, a structural depression in the Northern Afar Rift (Red Sea). Heliyon 2017; 3:e00301. [PMID: 28560355 PMCID: PMC5443967 DOI: 10.1016/j.heliyon.2017.e00301] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Revised: 03/02/2017] [Accepted: 05/08/2017] [Indexed: 10/26/2022] Open
Abstract
The boundary between the African and Arabian plates in the Southern Red Sea region is displaced inland in the northern Afar rift, where it is marked by the Red Sea-parallel Erta Ale, Alaita, and Tat Ali volcanic ridges. The Erta Ale is offset by about 20 and 40 km from the two en echelon ridges to the south. The offset area is highly seismic and marked by a depression filled by lake Afrera, a saline body of water fed by hydrothermal springs. Acoustic bathymetric profiles show ≈80 m deep canyons parallel to the NNW shore of the lake, part of a system of extensional normal faults striking parallel to the Red Sea. This system is intersected by oblique structures, some with strike-slip earthquakes, in what might evolve into a transform boundary. Given that the lake's surface lies today about 112 m below sea level, the depressed (minus ≈190 m below sea level) lake's bottom area may be considered the equivalent of the "nodal deep" in slow-slip oceanic transforms. The chemistry of the lake is compatible with the water having originated from hydrothermal liquids that had reacted with evaporites and basalts, rather than residual from evaporation of sea water. Bottom sediments include calcitic grains, halite and gypsum, as well as ostracod and diatom tests. The lake's level appears to have dropped by over 10 m during the last ≈50 years, continuing a drying up trend of the last few thousand years, after a "wet" stage 9,800 and 7,800 years before present when according to Gasse (1973) Lake Afrera covered an area several times larger than at present. This "wet" stage corresponds to an early Holocene warm-humid climate that prevailed in Saharan and Sub Saharan Africa. Lake Abhé, located roughly 250 km south of Afrera, shows similar climate-driven oscillations of its level.
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Affiliation(s)
- Enrico Bonatti
- Istituto Scienze Marine, CNR Bologna, Italy.,Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, USA
| | | | | | - Luca Lupi
- Centro documentazione Dancalia Italiana, Pontedera, Italy
| | - Orlando Vaselli
- Department of Earth Sciences, University of Florence, Firenze, Italy
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Mapping the evolving strain field during continental breakup from crustal anisotropy in the Afar Depression. Nat Commun 2011; 2:285. [PMID: 21505441 PMCID: PMC3104516 DOI: 10.1038/ncomms1287] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2010] [Accepted: 03/23/2011] [Indexed: 11/09/2022] Open
Abstract
Rifting of the continents leading to plate rupture occurs by a combination of mechanical deformation and magma intrusion, yet the spatial and temporal scales over which these alternate mechanisms localize extensional strain remain controversial. Here we quantify anisotropy of the upper crust across the volcanically active Afar Triple Junction using shear-wave splitting from local earthquakes to evaluate the distribution and orientation of strain in a region of continental breakup. The pattern of S-wave splitting in Afar is best explained by anisotropy from deformation-related structures, with the dramatic change in splitting parameters into the rift axis from the increased density of dyke-induced faulting combined with a contribution from oriented melt pockets near volcanic centres. The lack of rift-perpendicular anisotropy in the lithosphere, and corroborating geoscientific evidence of extension dominated by dyking, provide strong evidence that magma intrusion achieves the majority of plate opening in this zone of incipient plate rupture.
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9
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Bailey GN, Reynolds SC, King GCP. Landscapes of human evolution: models and methods of tectonic geomorphology and the reconstruction of hominin landscapes. J Hum Evol 2010; 60:257-80. [PMID: 20947132 DOI: 10.1016/j.jhevol.2010.01.004] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2008] [Revised: 05/09/2009] [Accepted: 12/10/2009] [Indexed: 11/30/2022]
Abstract
This paper examines the relationship between complex and tectonically active landscapes and patterns of human evolution. We show how active tectonics can produce dynamic landscapes with geomorphological and topographic features that may be critical to long-term patterns of hominin land use, but which are not typically addressed in landscape reconstructions based on existing geological and paleoenvironmental principles. We describe methods of representing topography at a range of scales using measures of roughness based on digital elevation data, and combine the resulting maps with satellite imagery and ground observations to reconstruct features of the wider landscape as they existed at the time of hominin occupation and activity. We apply these methods to sites in South Africa, where relatively stable topography facilitates reconstruction. We demonstrate the presence of previously unrecognized tectonic effects and their implications for the interpretation of hominin habitats and land use. In parts of the East African Rift, reconstruction is more difficult because of dramatic changes since the time of hominin occupation, while fossils are often found in places where activity has now almost ceased. However, we show that original, dynamic landscape features can be assessed by analogy with parts of the Rift that are currently active and indicate how this approach can complement other sources of information to add new insights and pose new questions for future investigation of hominin land use and habitats.
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Affiliation(s)
- Geoffrey N Bailey
- Department of Archaeology, University of York, The King's Manor, York, YO1 7EP, UK.
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10
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Fournier M, Chamot-Rooke N, Petit C, Huchon P, Al-Kathiri A, Audin L, Beslier MO, d'Acremont E, Fabbri O, Fleury JM, Khanbari K, Lepvrier C, Leroy S, Maillot B, Merkouriev S. Arabia-Somalia plate kinematics, evolution of the Aden-Owen-Carlsberg triple junction, and opening of the Gulf of Aden. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2008jb006257] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Grandin R, Socquet A, Binet R, Klinger Y, Jacques E, de Chabalier JB, King GCP, Lasserre C, Tait S, Tapponnier P, Delorme A, Pinzuti P. September 2005 Manda Hararo-Dabbahu rifting event, Afar (Ethiopia): Constraints provided by geodetic data. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008jb005843] [Citation(s) in RCA: 108] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Feuillet N, Tapponnier P, Manighetti I, Villemant B, King GCP. Differential uplift and tilt of Pleistocene reef platforms and Quaternary slip rate on the Morne-Piton normal fault (Guadeloupe, French West Indies). ACTA ACUST UNITED AC 2004. [DOI: 10.1029/2003jb002496] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- N. Feuillet
- Institut De Physique du Globe de Paris; Laboratoire de Tectonique et Mécanique de la Lithosphère; Paris France
| | - P. Tapponnier
- Institut De Physique du Globe de Paris; Laboratoire de Tectonique et Mécanique de la Lithosphère; Paris France
| | - I. Manighetti
- Institut De Physique du Globe de Paris; Laboratoire de Tectonique et Mécanique de la Lithosphère; Paris France
| | - B. Villemant
- Université Pierre et Marie Curie and Institut De Physique du Globe de Paris; Laboratoire de Géochimie des Systèmes Volcaniques; CNRS UMR 7040 Paris France
| | - G. C. P. King
- Institut De Physique du Globe de Paris; Laboratoire de Tectonique et Mécanique de la Lithosphère; Paris France
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Persaud P, Stock JM, Steckler MS, Martín-Barajas A, Diebold JB, González-Fernández A, Mountain GS. Active deformation and shallow structure of the Wagner, Consag, and Delfín Basins, northern Gulf of California, Mexico. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2002jb001937] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Patricia Persaud
- Seismological Laboratory; California Institute of Technology; Pasadena California USA
| | - Joann M. Stock
- Seismological Laboratory; California Institute of Technology; Pasadena California USA
| | - Michael S. Steckler
- Lamont-Doherty Earth Observatory; Columbia University; Palisades New York USA
| | - Arturo Martín-Barajas
- Centro de Investigación Científica y Educacion Superior de Ensenada; Ensenada, Baja California Mexico
| | - John B. Diebold
- Lamont-Doherty Earth Observatory; Columbia University; Palisades New York USA
| | | | - Gregory S. Mountain
- Lamont-Doherty Earth Observatory; Columbia University; Palisades New York USA
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Lahitte P, Gillot PY, Kidane T, Courtillot V, Bekele A. New age constraints on the timing of volcanism in central Afar, in the presence of propagating rifts. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2001jb001689] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Pierre Lahitte
- Laboratoire de Géochronologie Multi-Techniques UPS-IPGP; Université Paris-Sud; Orsay France
| | - Pierre-Yves Gillot
- Laboratoire de Géochronologie Multi-Techniques UPS-IPGP; Université Paris-Sud; Orsay France
| | - Tesfaye Kidane
- Laboratoires de Paléomagnétisme et de Tectonique; Institut de Physique du Globe de Paris; Paris France
| | - Vincent Courtillot
- Laboratoires de Paléomagnétisme et de Tectonique; Institut de Physique du Globe de Paris; Paris France
| | - Abebe Bekele
- Department of Geology and Geophysics; University of Addis-Ababa; Addis-Ababa Ethiopia
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Kidane T, Courtillot V, Manighetti I, Audin L, Lahitte P, Quidelleur X, Gillot PY, Gallet Y, Carlut J, Haile T. New paleomagnetic and geochronologic results from Ethiopian Afar: Block rotations linked to rift overlap and propagation and determination of a ∼2 Ma reference pole for stable Africa. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2001jb000645] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Tesfaye Kidane
- Laboratoires de Paléomagnétisme et de Tectonique; Institut de Physique du Globe de Paris; Paris France
- Department of Geology and Geophysics; University of Addis-Ababa; Addis-Ababa Ethiopia
| | - Vincent Courtillot
- Laboratoires de Paléomagnétisme et de Tectonique; Institut de Physique du Globe de Paris; Paris France
| | - Isabelle Manighetti
- Laboratoires de Paléomagnétisme et de Tectonique; Institut de Physique du Globe de Paris; Paris France
| | - Laurence Audin
- Laboratoires de Paléomagnétisme et de Tectonique; Institut de Physique du Globe de Paris; Paris France
- Institut de Recherche pour le Devoloppement; Université Paul Sabatier, Géologie; Toulouse France
| | - Pierre Lahitte
- Laboratoire de Géochronologie Multi-Techniques, Université Paris Sud-Institut de Physique du Globe de Paris, Sciences de la Terre; Université Paris XI-Paris Sud; Orsay France
| | - Xavier Quidelleur
- Laboratoires de Paléomagnétisme et de Tectonique; Institut de Physique du Globe de Paris; Paris France
- Laboratoire de Géochronologie Multi-Techniques, Université Paris Sud-Institut de Physique du Globe de Paris, Sciences de la Terre; Université Paris XI-Paris Sud; Orsay France
| | - Pierre-Yves Gillot
- Laboratoire de Géochronologie Multi-Techniques, Université Paris Sud-Institut de Physique du Globe de Paris, Sciences de la Terre; Université Paris XI-Paris Sud; Orsay France
| | - Yves Gallet
- Laboratoires de Paléomagnétisme et de Tectonique; Institut de Physique du Globe de Paris; Paris France
| | - Julie Carlut
- Laboratoire de Géologie; Ecole Normale Supérieure; Paris France
| | - Tigistu Haile
- Department of Geology and Geophysics; University of Addis-Ababa; Addis-Ababa Ethiopia
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17
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Feuillet N, Manighetti I, Tapponnier P, Jacques E. Arc parallel extension and localization of volcanic complexes in Guadeloupe, Lesser Antilles. ACTA ACUST UNITED AC 2002. [DOI: 10.1029/2001jb000308] [Citation(s) in RCA: 142] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- N. Feuillet
- Institut de Physique du Globe de Paris; Laboratoire de Tectonique et Mécanique de la Lithosphère, CNRS UMR 7578; Paris France
| | - I. Manighetti
- Institut de Physique du Globe de Paris; Laboratoire de Tectonique et Mécanique de la Lithosphère, CNRS UMR 7578; Paris France
| | - P. Tapponnier
- Institut de Physique du Globe de Paris; Laboratoire de Tectonique et Mécanique de la Lithosphère, CNRS UMR 7578; Paris France
| | - E. Jacques
- Institut de Physique du Globe de Strasbourg; France
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Hébert H, Deplus C, Huchon P, Khanbari K, Audin L. Lithospheric structure of a nascent spreading ridge inferred from gravity data: The western Gulf of Aden. ACTA ACUST UNITED AC 2001. [DOI: 10.1029/2000jb900391] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Manighetti I, Tapponnier P, Courtillot V, Gallet Y, Jacques E, Gillot PY. Strain transfer between disconnected, propagating rifts in Afar. ACTA ACUST UNITED AC 2001. [DOI: 10.1029/2000jb900454] [Citation(s) in RCA: 102] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Manighetti I, King GCP, Gaudemer Y, Scholz CH, Doubre C. Slip accumulation and lateral propagation of active normal faults in Afar. ACTA ACUST UNITED AC 2001. [DOI: 10.1029/2000jb900471] [Citation(s) in RCA: 209] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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