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Vestiges of the Kerguelen Mantle Plume in Southern Tibet:Evidence from 123-117 Ma Magmatism in the Dingri Area of the Central Tethys Himalaya

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Acta Geologica Sinica(English Edition) 2023年第4期97卷 1163-1180页

作者： YAN Songtao WU Qingsong LI Hu DAI Xuejian ZHU Lidong WANG Jie XIN Chongyang Civil-Military Integration Center of China Geological Survey China Geological SurveyChengdu 610036China Institute of Sedimentary Geology Chengdu University of TechnologyChengdu 610059China College of Earth Science Chengdu University of TechnologyChengdu 610059China

The widely distributed Early Cretaceous magmatism in the Tethys Himalaya(TH)of southern Tibet is related to the Kerguelen mantle *** magmatic activity products are distributed in the eastern TH,where the active age is earlier than the peak ages of the Kerguelen mantle *** study investigated magmatic activity of the Dingri area in the central TH which was coeval with the Kerguelen mantle *** intrusion in the Dingri area contains diabases and *** zircon age of diabase is 123±1 Ma,and that of monzonite is 117±1 *** and Sr-Nd isotopic analyses show that the mafic-intermediate dikes were formed in an intraplate extensional *** diabase is derived from the enriched lithospheric mantle and monzonite is derived from partial melting of the lower crust,with both magmatic evolutions being contaminated by crustal *** characteristics are similar to those of the Rajmahal-Sylhet basalt,a typical Kerguelen mantle plume *** discovery of the Dingri mafic-intermediate dikes of the central TH suggests that the TH and Rajmahal-Sylhet Traps formed a continuous mantle plume overflow magmatic belt which was a product of the continuous eruption of the Kerguelen mantle plume.

关键词： geochronology mafic-intermediate dikes Kerguelen mantle plume central Tethys Himalaya east gondwana

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Asia–gondwana connections indicated by Devonian fishes from Australia:palaeogeographic considerations

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Journal of Palaeogeography 2020年第2期9卷 128-149页

作者： Gavin Charles Young Jing Lu Department of Applied Mathematics Research School of PhysicsAustralian National UniversityCanberraAustralia Australian Museum Research Institute SydneyAustralia Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences Institute of Vertebrate Paleontology&PaleoanthropologyChinese Academy of SciencesBeijing 10004China CAS Center for Excellence in Life and Paleoenvironment Beijing 10004China.

Middle Palaeozoic vertebrate fossil occurrences are summarised for Australia, with reference to faunal connections between Asia and east gondwana, as first indicated by fish distributions of Lower Devonian fossil sites. Major endemic groups discussed are pituriaspid(Australian) and galeaspid(Asian) agnathans, wuttagoonaspids(Australian)and antarctaspid(Antarctic, Australian, Asian) arthrodires, yunnanolepid and sinolepid antiarchs(South China,Indochina terrane, Australia), and early tetrapodomorphs(South China, Australia). More widespread groups that lived in shallow marine environments(lungfishes, buchanosteid arthrodires, antiarch Bothriolepis) also show species groups shared between South China and east gondwana. Exchange of continental facies fishes(e.g. tristichopterid tetrapodomorphs) may have been interrupted by marine transgression in the Frasnian, but were restored in the late Famennian with the appearance of Grenfellaspis in eastern Australia, the only sinolepid antiarch known from outside Asia. The hypothesis of gondwana dispersion and Asian accretion, to explain the collage of geological terranes forming modern east and southeast Asia, implies increasing dissimilarity with increasing age, but the SiluroDevonian early vertebrate evidence is inconsistent with this. Previous cladistic analysis of Asian terranes predicted galeaspid agnathans on the Indochina terrane, and their subsequent discovery at Ly Hoa, Vietnam, confirms that Indochina and South China had come together across the Song Ma suture by Middle Devonian time.

关键词： Devonian Palaeogeography Biogeography Vertebrates east gondwana South China Indochina terrane

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