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The Characteristics of the Indosinian Pacific-Type Ancient Continental Margin in the Qinghai-Xizang(Tibet)-Sichuan-Yunnan Region 被引量:1
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作者 Gao Yanlin Qinghai Provincial Commission for Science and Technology,Xining, Qinghai Jiang Minxi 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 1991年第1期1-18,共18页
The Qinghai-Xizang (Tibet) Plateau and the 'Sanjiang' area②, where are extensively developed theTethys-type marine Triassic sequences with Indosinian tectonic disturbance and magmatism, provide an impor-tant ... The Qinghai-Xizang (Tibet) Plateau and the 'Sanjiang' area②, where are extensively developed theTethys-type marine Triassic sequences with Indosinian tectonic disturbance and magmatism, provide an impor-tant region for the study of the tectonic evolution and the Indosinian movement of China as well as for thestudy of the boundary between Gondwana and Laurasia and the characteristics of the time-space distributionof the Tethys oceanic crust within the territory of China. Over a long period of time in the past, quite a numberof scholars made substantial studies and discussious from various viewpoints on the geotectonie and regionalgeological evolution of this region. Based on some new data obtained recently and the field observations by theauthor, and by using the plate tectonic theory, the author considers that there developed a Pacific-type (activetype) ancient continental margin bordering the Palaeo-Tethys ocean (or North Tethys ocean) in the south inLate Permian to Triassic times in the region of south-central Qinghai, northeastern Xizang (Tibet), western andsouthwestern Sichuan, and western Yunnan. Its characteristics basically represent the Indosinian tectonic evo-lution of this region. 展开更多
关键词 TIBET The Characteristics of the Indosinian pacific-type Ancient Continental Margin in the Qinghai-Xizang
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Triggers and sources of volatile-bearing plumes in the mantle transition zone 被引量:4
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作者 Inna Safonova Konstantin Litasov Shigenori Maruyama 《Geoscience Frontiers》 SCIE CAS CSCD 2015年第5期679-685,共7页
The paper discusses generation of volatile-bearing plumes in the mantle transition zone(MTZ) in terms of mineral-fluid petrology and their related formation of numerous localities of intra-plate bimodal volcanic serie... The paper discusses generation of volatile-bearing plumes in the mantle transition zone(MTZ) in terms of mineral-fluid petrology and their related formation of numerous localities of intra-plate bimodal volcanic series in Central and East Asia.The plume generation in the MTZ can be triggered by the tectonic erosion of continental crust at Pacific-type convergent margins and by the presence of water and carbon dioxide in the mantle.Most probable sources of volatiles are the hyclrated/carbonated sediments and basalts and serpentinite of oceanic slabs,which can be subducted down to the deep mantle.Tectonic erosion of continental crust supplies crustal material enriched in uranium and thorium into the mantle,which can serve source of heat in the MTZ.The heating in the MTZ induces melting of subducted slabs and continental crust and mantle upwelling,to produce OIB-type mafic and felsic melts,respectively. 展开更多
关键词 Asis pacific-type convergent margin Continental cr
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