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Han R, Wu J, Zhang Y, Chen Q, Sun B. Oblique distribution patterns and the underlying mechanical model of orebody groups controlled by structures at different scales. Sci Rep 2024; 14:4591. [PMID: 38409479 PMCID: PMC10897225 DOI: 10.1038/s41598-024-55473-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Accepted: 02/23/2024] [Indexed: 02/28/2024] Open
Abstract
The oblique distribution of orebodies is a basic feature of the spatial distribution of orebody groups in hydrothermal deposits, and it is closely related to the shearing effect. However, the oblique distribution patterns of orebody groups controlled by ore-controlling/ore-forming structures at different scales (orebody, ore deposit and ore field scales) and the underlying formation mechanism are unclear but could be used to directly constrain mineral exploration and prospecting breakthroughs in the deep and peripheral areas of ore deposits. This paper uses the northeastern Yunnan Ge-rich Pb-Zn ore concentration area in the Sichuan-Yunnan-Guizhou metallogenic area as an example to analyse and demonstrate the oblique distribution patterns of orebodies (orebody groups) controlled by ore-forming/ore-controlling structures at different scales and the underlying mechanical model based on the Theory and Methods of Ore field Geomechanics. The results indicate that in 3D space, the oblique distributions of orebodies (veins), orebody groups and ore deposits are controlled by the mechanical properties, kinematic characteristics, and tectonic stress fields of ore-forming/ore-controlling fault structures of different sequences during the mineralization period. This study has an important guiding role for ore field-scale exploration deployment, evaluation of deep and peripheral prospecting, and exploration project arrangement, with the aim of helping mining companies increase resource reserves and production.
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Affiliation(s)
- Runsheng Han
- Southwest Institute of Geological Survey, Geological Survey Center for Nonferrous Metals Resources, Kunming University of Science and Technology, Kunming, 650093, Yunnan, China.
| | - Jianbiao Wu
- Southwest Institute of Geological Survey, Geological Survey Center for Nonferrous Metals Resources, Kunming University of Science and Technology, Kunming, 650093, Yunnan, China.
| | - Yan Zhang
- Southwest Institute of Geological Survey, Geological Survey Center for Nonferrous Metals Resources, Kunming University of Science and Technology, Kunming, 650093, Yunnan, China
| | - Qing Chen
- Yunnan Chihong Zinc Germanium Co., Ltd, Qujing, 655011, Yunnan, China
| | - Bangtao Sun
- Yiliang Chihong Co., Ltd, Zhaotong, 657600, Yunnan, China
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Gentis N, Licht A, De Franceschi D, Win Z, Aung DW, Dupont-Nivet G, Boura A. First fossil woods and palm stems from the mid-Paleocene of Myanmar and implications for biogeography and wood anatomy. AMERICAN JOURNAL OF BOTANY 2024; 111:e16259. [PMID: 38031479 DOI: 10.1002/ajb2.16259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 10/23/2023] [Accepted: 10/23/2023] [Indexed: 12/01/2023]
Abstract
PREMISE The rise of angiosperm-dominated tropical rainforests has been proposed to have occurred shortly after the Cretaceous-Paleogene transition. Paleocene fossil wood assemblages are rare yet provide important data for understanding these forests and whether their wood anatomical features can be used to document the changes that occurred during this transition. METHODS We used standard techniques to section 11 fossil wood specimens of Paleocene-age, described the anatomy using standard terminology, and investigated their affinities to present-day taxa. RESULTS We report here the first middle Paleocene fossil wood specimens from Myanmar, which at the time was near the equator and anchored to India. Some fossils share affinities with Arecaceae, Sapindales (Anacardiaceae, Meliaceae) and Moraceae and possibly Fabaceae or Lauraceae. One specimen is described as a new species and genus: Compitoxylon paleocenicum gen. et sp. nov. CONCLUSIONS This assemblage reveals the long-lasting presence of these aforementioned groups in South Asia and suggests the early presence of multiple taxa of Laurasian affinity in Myanmar and India. The wood anatomical features of the dicotyledonous specimens reveal that both "modern" and "primitive" features (in a Baileyan scheme) are present with proportions similar to features in specimens from Paleocene Indian localities. Their anatomical diversity corroborates that tropical flora display "modern" features early in the history of angiosperms and that their high diversity remained steady afterward.
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Affiliation(s)
- Nicolas Gentis
- CR2P, UMR7207, MNHN, Sorbonne Université, CNRS, 57 rue Cuvier, CP 48, 75005, Paris, France
| | - Alexis Licht
- CEREGE, Aix Marseille Université, CNRS, IRD, INRAE, Collège de France, Europole Méditerranéen de l'Arbois, BP 80, 13545, Aix-en-Provence, France
| | - Dario De Franceschi
- CR2P, UMR7207, MNHN, Sorbonne Université, CNRS, 57 rue Cuvier, CP 48, 75005, Paris, France
| | - Zaw Win
- Geology Department, Shwebo University, Sagaing Region, Myanmar
| | - Day Wa Aung
- Geology Department, University of Yangon, Pyay Rd, Yangon, Myanmar
| | - Guillaume Dupont-Nivet
- Géosciences Rennes, Université de Rennes 1, 35042, Rennes, France
- Helmholtz Centre Potsdam, German Research Centre for Geosciences, 14473, Potsdam, Germany
| | - Anaïs Boura
- CR2P, UMR7207, MNHN, Sorbonne Université, CNRS, 57 rue Cuvier, CP 48, 75005, Paris, France
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Wood HM, Wunderlich J. Burma Terrane Amber Fauna Shows Connections to Gondwana and Transported Gondwanan Lineages to the Northern Hemisphere (Araneae: Palpimanoidea). Syst Biol 2023; 72:1233-1246. [PMID: 37527553 DOI: 10.1093/sysbio/syad047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 07/24/2023] [Accepted: 07/31/2023] [Indexed: 08/03/2023] Open
Abstract
Burmese amber is a significant source of fossils that documents the mid-Cretaceous biota. This deposit was formed around 99 Ma on the Burma Terrane, which broke away from Gondwana and later collided with Asia, although the timing is disputed. Palpimanoidea is a dispersal-limited group that was a dominant element of the Mesozoic spider fauna, and has an extensive fossil record, particularly from Burmese amber. Using morphological and molecular data, evolutionary relationships of living and fossil Palpimanoidea are examined. Divergence dating with fossils as terminal tips shows timing of diversification is contemporaneous with continental breakup.Ancestral range estimations show widespread ancestral ranges that divide into lineages that inherit different Pangean fragments, consistent with vicariance. Our results suggest that the Burmese amber fauna has ties to Gondwana due to a historical connection in the Early Cretaceous, and that the Burma Terrane facilitated biotic exchange by transporting lineages from Gondwana into the Holarctic in the Cretaceous.
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Affiliation(s)
- Hannah M Wood
- Department of Entomology, National Museum of Natural History, Smithsonian Institution, 10th & Constitution Ave. NW, Washington, DC 20560, USA
| | - Jörg Wunderlich
- Oberer Häuselbergweg 24, 69493 Hirschberg an der Bergstraße, Germany
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Bespalaya YV, Palatov DM, Gofarov MY, Kondakov AV, Kropotin AV, Sousa R, Taskinen J, Inkhavilay K, Tanmuangpak K, Tumpeesuwan S, Vikhrev IV, Bolotov IN. Associations of mayfly larvae with Corbicula clams. Biol J Linn Soc Lond 2023. [DOI: 10.1093/biolinnean/blac143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Abstract
Currently, the parasitic and endosymbiontic fauna of Corbicula clams remain poorly studied throughout their range. Here, using samples from the Mekong basin, we describe two Symbiocloeon species new to science: Symbiocloeon corbiculinus sp. nov. and Symbiocloeon laoensis sp. nov. Our results and a review of available published data indicate that freshwater bivalve-associated mayflies are narrow host specialists, being associated with one or a few closely related species of freshwater bivalves. The bivalve-associated mayfly larvae have several specific morphological traits compared with free-living species, which include a reduction of integument chitinization and a significant reduction of the surface structures on segments. An increase in area of the respiratory surface of larval tergalia was also recorded. The possible positive and negative effects of mayflies on the clam hosts are discussed. This study is an example of the many possible hidden associations between aquatic species that remain to be described.
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Affiliation(s)
- Yulia V Bespalaya
- N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences , Severnaya Dvina Embankment 23, 163000 Arkhangelsk , Russian Federation
| | - Dmitry M Palatov
- N. Severtsov Institute of Ecology and Evolution of the Russian Academy of Sciences , Leninsky Prospect 33, 119071 Moscow , Russian Federation
| | - Mikhail Yu Gofarov
- N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences , Severnaya Dvina Embankment 23, 163000 Arkhangelsk , Russian Federation
| | - Alexander V Kondakov
- N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences , Severnaya Dvina Embankment 23, 163000 Arkhangelsk , Russian Federation
| | - Alexander V Kropotin
- N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences , Severnaya Dvina Embankment 23, 163000 Arkhangelsk , Russian Federation
| | - Ronaldo Sousa
- CBMA – Centre of Molecular and Environmental Biology, Department of Biology, University of Minho , Braga , Portugal
| | - Jouni Taskinen
- Department of Biological and Environmental Science, University of Jyvӓskylӓ , PO Box 35, 40014 , Finland
| | | | - Kitti Tanmuangpak
- Department of Science, Faculty of Science and Technology, Loei Rajabhat University , Loei , Thailand
| | - Sakboworn Tumpeesuwan
- Department of Biology, Faculty of Science, Mahasarakham University , Maha Sarakham , Thailand
| | - Ilya V Vikhrev
- N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences , Severnaya Dvina Embankment 23, 163000 Arkhangelsk , Russian Federation
| | - Ivan N Bolotov
- N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences , Severnaya Dvina Embankment 23, 163000 Arkhangelsk , Russian Federation
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Follow the Footsteps of Leonardo Fea: An Example of an Integrative Revision of Freshwater Mussel Taxa Described from the Former British Burma (Myanmar). J ZOOL SYST EVOL RES 2022. [DOI: 10.1155/2022/6600359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Leonardo Fea, an Italian explorer and traveler, sampled a comprehensive collection of continental Mollusca during his travels throughout the former British Burma (currently Myanmar) in 1885-1887. Cesare Maria Tapparone-Canefri, an Italian malacologist, studied this sample and published a paper with a description of numerous terrestrial and freshwater molluscan taxa new to science. This collection was partly deposited in the Museo Civico di Storia Naturale di Genova (MSNG), Italy and the Indian Museum (ZSI: Zoological Survey of India) in Kolkata. Here, we provide a re-analysis of C.M. Tapparone-Canefri’s Burmese Unionidae collection. Our study reveals that the type series of only four nominal taxa described by Tapparone-Canefri as new to science in 1889 are still available in the MSNG, i.e. Unio rectangularis, U. pulcher, U. protensus var. obtusatus, and U. marginalis var. subflabellata. The first taxon is a valid species belonging to the genus Yaukthwa, while U. pulcher and U. protensus var. obtusatus are considered here as junior synonyms of the widespread Lamellidens generosus, and the last nominal taxon corresponds to L. savadiensis. The MSNG collection also contains shell lots of Indochinella pugio pugio, I. pugio paradoxa, Indonaia andersoniana, Radiatula chaudhurii, R. mouhoti haungthayawensis, Lamellidens savadiensis, L. generosus, Yaukthwa nesemanni, and Y. zayleymanensis, most of which were listed in Tapparone-Canefri’s work under incorrect names. We revise all the freshwater mussel taxa listed by Tapparone-Canefri based on the original descriptions, available DNA sequences, morphological data, and biogeographic evidence. A freshwater mussel from the Haungthayaw River that was identified by Tapparone-Canefri as Unio exolescens is described here as Trapezoideus mitanensis sp. nov., a fourth species in this small Contradentini genus with a restricted range. Finally, new taxonomic opinions are proposed here for Leoparreysia tavoyensis, Trapezidens dolichorhynchus, Lamellidens generosus, and Lamellidens savadiensis.
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Nagel KO, Schiøtte T, Gofarov MY, Vikhrev IV, Konopleva ES, Bolotov IN. Re-discovery of the type series of the Indian freshwater mussel Parreysia corrugata (O. F. Müller, 1774) with the designation of the lectotype (Bivalvia: Unionidae: Parreysiinae). J NAT HIST 2022. [DOI: 10.1080/00222933.2022.2063083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Karl-Otto Nagel
- Malacological Section, Senckenberg Research Institute and Natural History Museum Frankfurt/M, Senckenberganlage 25, Frankfurt am Main, Germany
| | - Tom Schiøtte
- Natural History Museum of Denmark (Zoology), Copenhagen OE, Denmark
| | - Mikhail Y. Gofarov
- N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences, Arkhangelsk, Russia
| | - Ilya V. Vikhrev
- N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences, Arkhangelsk, Russia
- Northern Arctic Federal University, Arkhangelsk, Russia
| | - Ekaterina S. Konopleva
- N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences, Arkhangelsk, Russia
- Northern Arctic Federal University, Arkhangelsk, Russia
| | - Ivan N. Bolotov
- N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences, Arkhangelsk, Russia
- Northern Arctic Federal University, Arkhangelsk, Russia
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