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An Isotopic Survey of Pacific Oceanic Plateaus: Implications for their Nature and Origin. ACTA ACUST UNITED AC 2013. [DOI: 10.1029/gm043p0207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Saunders AD, Fitton JG, Kerr AC, Norry MJ, Kent RW. The North Atlantic Igneous Province. LARGE IGNEOUS PROVINCES: CONTINENTAL, OCEANIC, AND PLANETARY FLOOD VOLCANISM 2013. [DOI: 10.1029/gm100p0045] [Citation(s) in RCA: 153] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Czamanske GK, Ishihara S, Atkin SA. Chemistry of rock-forming minerals of the Cretaceous-Paleocene batholith in southwestern Japan and implications for magma genesis. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/jb086ib11p10431] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Hildreth W. Gradients in silicic magma chambers: Implications for lithospheric magmatism. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/jb086ib11p10153] [Citation(s) in RCA: 1048] [Impact Index Per Article: 87.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Davies GF. Geophysical and isotopic constraints on mantle convection: An interim synthesis. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/jb089ib07p06017] [Citation(s) in RCA: 148] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Lakomy R. Implications for cratering mechanics from a study of the Footwall Breccia of the Sudbury impact structure, Canada. ACTA ACUST UNITED AC 2012. [DOI: 10.1111/j.1945-5100.1990.tb00997.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Depaolo DJ, Wasserburg GJ. Neodymium isotopes in flood basalts from the Siberian Platform and inferences about their mantle sources. Proc Natl Acad Sci U S A 2010; 76:3056-60. [PMID: 16592671 PMCID: PMC383761 DOI: 10.1073/pnas.76.7.3056] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The initial isotopic compositions of Nd and Sr in basalts from the Central Siberian Plateau and other major continental flood basalts are reported. The continental flood basalts appear to be the product of partial melting of mantle sources that consist of relatively primitive undifferentiated material and are clearly distinct from midocean ridge basalts, which sample mantle reservoirs that have been modified by extraction of continental crust earlier in earth history. These observations provide fundamental constraints on models of mantle structure and dynamics. Isotopic effects of crustal contamination are clearly recognizable in some continental flood basalts, but these effects can be distinguished from isotopic patterns inherited from the mantle magma sources.
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Affiliation(s)
- D J Depaolo
- The Lunatic Asylum, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125
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Boerner DE, Kurtz RD, Craven JA, Ross GM, Jones FW, Davis WJ. Electrical conductivity in the precambrian lithosphere of western canada. Science 1999; 283:668-70. [PMID: 9924022 DOI: 10.1126/science.283.5402.668] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The subcrustal lithosphere underlying the southern Archean Churchill Province (ACP) in western Canada is at least one order of magnitude more electrically conductive than the lithosphere beneath adjacent Paleoproterozoic crust. The measured electrical properties of the lithosphere underlying most of the Paleoproterozoic crust can be explained by the conductivity of olivine. Mantle xenolith and geological mapping evidence indicate that the lithosphere beneath the southern ACP was substantially modified as a result of being trapped between two nearly synchronous Paleoproterozoic subduction zones. Tectonically induced metasomatism thus may have enhanced the subcrustal lithosphere conductivity of the southern ACP.
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Affiliation(s)
- DE Boerner
- D. E. Boerner and J. A. Craven, Geological Survey of Canada, 615 Booth Street, Ottawa, Ontario K1A OE9, Canada. R. D. Kurtz and W. J. Davis, Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A OE8, Canada. G. M. Ross, Geologica
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Crustal contamination and the granite problem in the British Tertiary Volcanic Province. ACTA ACUST UNITED AC 1997. [DOI: 10.1098/rsta.1984.0018] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Isotopic studies on the British Tertiary Volcanic Province have shown that the granites contain both mantle-derived and crustal components, while basic rocks display pronounced crustal contamination. In order to study contamination mechanisms in greater detail, isotopic and chemical variations in Skye plateau lavas and Cuillins Complex intrusive units were examined as a function of time. In both cases degrees of crustal contamination generally fall with time, which, it is argued, reflects the progressive melting and ‘sweating out' of Lewisian acid gneissic sheets from the more refractory intermediate basement during repeated intrusion and contamination of sheet-like magma reservoirs. Long lived developing magma chambers do not fit the data well. Skye granites had basic precursors that suffered similar types of contamination in the lower crust, but tended to form longer lived developing magma chambers in the upper crust. Nevertheless, Skye granites display similar crustal Pb contents to associated basic intrusions, and are argued not to be the products of crustal anatexis, but the differentiates of Preshal Mhor basic magmas contaminated by
ca
. 10% with large degree partial melts of Lewisian acid gneisses.
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Relative roles of source composition, fractional crystallization and crustal contamination in the petrogenesis of Andean volcanic rocks. ACTA ACUST UNITED AC 1997. [DOI: 10.1098/rsta.1984.0014] [Citation(s) in RCA: 115] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
There are well established differences in the chemical and isotopic characteristics of the calc-alkaline basalt—andesite-dacite-rhyolite association of the northern (n.v.z.), central (c.v.z.) and southern volcanic zones (s.v.z.) of the South American Andes. Volcanic rocks of the alkaline basalt-trachyte association occur within and to the east of these active volcanic zones. The chemical and isotopic characteristics of the n.v.z. basaltic andesites and andesites and the s.v.z. basalts, basaltic andesites and andesites are consistent with derivation by fractional crystallization of basaltic parent magmas formed by partial melting of the asthenospheric mantle wedge containing components from subducted oceanic lithosphere. Conversely, the alkaline lavas are derived from basaltic parent magmas formed from mantle of ‘within-plate’ character. Recent basaltic andesites from the Cerro Galan volcanic centre to the SE of the c.v.z. are derived from mantle containing both subduction zone and within-plate components, and have experienced assimilation and fractional crystallization (a.f.c.) during uprise through the continental crust. The c.v.z. basaltic andesites are derived from mantle containing subduction-zone components, probably accompanied by a.f.c. within the continental crust. Some c.v.z. lavas and pyroclastic rocks show petrological and geochemical evidence for magma mixing. The petrogenesis of the c.v.z. lavas is therefore a complex process in which magmas derived from heterogeneous mantle experience assimilation, fractional crystallization, and magma mixing during uprise through the continental crust.
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Fram MS, Lesher CE. Geochemical constraints on mantle melting during creation of the North Atlantic basin. Nature 1993. [DOI: 10.1038/363712a0] [Citation(s) in RCA: 72] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Ordovician bimodal magmatism in the Ogcheon belt (South Korea): intracontinental rift-related volcanic activity. ACTA ACUST UNITED AC 1992. [DOI: 10.1016/0743-9547(92)90054-f] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Fiechtner L, Friedrichsen H, Hammerschmidt K. Geochemistry and geochronology of Early Mesozoic tholeiites from Central Morocco. ACTA ACUST UNITED AC 1992. [DOI: 10.1007/bf01764538] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Nicholson SW, Shirey SB. Midcontinent rift volcanism in the Lake Superior Region: Sr, Nd, and Pb isotopic evidence for a mantle plume origin. ACTA ACUST UNITED AC 1990. [DOI: 10.1029/jb095ib07p10851] [Citation(s) in RCA: 98] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Application of Stable Isotopic Studies to Problems of Magmatic Sulfide Ore Genesis With Special Reference to the Duluth Complex, Minnesota. ACTA ACUST UNITED AC 1986. [DOI: 10.1007/978-3-642-70902-9_3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Dungan MA, Lindstrom MM, McMillan NJ, Moorbath S, Hoefs J, Haskin LA. Open system magmatic evolution of the Taos Plateau volcanic field, northern New Mexico: 1. The petrology and geochemistry of the Servilleta Basalt. ACTA ACUST UNITED AC 1986. [DOI: 10.1029/jb091ib06p05999] [Citation(s) in RCA: 86] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Azbel IY, Tolstikhin IN. SrNd and ArHe isotopic relationships: Comparison, geotectonic implications and approximation by model computing. ACTA ACUST UNITED AC 1985. [DOI: 10.1016/0168-9622(85)90006-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Nd—Sr isotopic composition of granulites and constraints on the evolution of the lower continental crust. Nature 1984. [DOI: 10.1038/307510a0] [Citation(s) in RCA: 197] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Radiogenic Isotopes – Some Geological Applications. ACTA ACUST UNITED AC 1984. [DOI: 10.1016/b978-0-444-42148-7.50016-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Verma SP, Schilling JG, Waggoner DG. Neodymium isotopic evidence for Galapagos hotspot—spreading centre system evolution. Nature 1983. [DOI: 10.1038/306654a0] [Citation(s) in RCA: 61] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Moorbath S, Taylor P. Chapter 20 Isotopic Evidence for Continental Growth in the Precambrian. DEVELOPMENTS IN PRECAMBRIAN GEOLOGY 1981. [DOI: 10.1016/s0166-2635(08)70025-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Strontium isotope composition of volcanic rocks: Evidence for contamination of the Kirkpatrick Basalt, Antarctica. ACTA ACUST UNITED AC 1981. [DOI: 10.1029/gd005p0075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Abstract
Lead isotope data from Quaternary andesitic lavas of the Arequipa and Barroso groups of southern Peru and from regional Precambrian granulitic gneisses reveal a lead component in the lavas from the gneisses. The lava leads can be accounted for by two-component mixtures of lead from mantle and lower crustal sources, although the mixing process need not have occurred in the lower crust.
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Nd–Sr isotopic relationship in granitoid rocks and continental crust development: a chemical approach to orogenesis. Nature 1980. [DOI: 10.1038/286335a0] [Citation(s) in RCA: 285] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Continental crust composition and nature of the lower crust: constraints from mantle Nd–Sr isotope correlation. Nature 1980. [DOI: 10.1038/286342a0] [Citation(s) in RCA: 40] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Askja 1875, Skye 56 Ma: Basalt-triggered, Plinian, mixed-magma eruptions during the emplacement of the Western Redhills granites, Isle-of-Skye, Scotland. ACTA ACUST UNITED AC 1980. [DOI: 10.1007/bf01869036] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Menzies M, Murthy VR. Enriched mantle: Nd and Sr isotopes in diopsides from kimberlite nodules. Nature 1980. [DOI: 10.1038/283634a0] [Citation(s) in RCA: 134] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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143Nd/144Nd and 87Sr/86Sr ratios from the Azores and their significance in LIL-element enriched mantle. Nature 1979. [DOI: 10.1038/280028a0] [Citation(s) in RCA: 141] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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O'Nions RK, Evensen NM, Hamilton PJ. Geochemical modeling of mantle differentiation and crustal growth. ACTA ACUST UNITED AC 1979. [DOI: 10.1029/jb084ib11p06091] [Citation(s) in RCA: 389] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Isotope geochemical studies Of North Atlantic Ocean basalts and their implications for mantle evolution. ACTA ACUST UNITED AC 1979. [DOI: 10.1029/me002p0342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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