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Late Cretaceous high-sr/y granitic rocks in the Eastern Tibetan Plateau: Crustal Thickening During Continental Collision

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Acta Geologica Sinica(English Edition) 2020年第S1期94卷 19-20页

作者： HU Peiyuan ZHAI Qingguo WANG Jun Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China

high-sr/y granitic rocks,characterized by intermediate–high SiO2 contents(>56 wt.%),high La/yb ratios(>20),and low y(<18 ppm)and yb(<1.9 ppm)contents,have drawn much attention from geologists in the past *** were ori... 详细信息

high-sr/y granitic rocks,characterized by intermediate–high SiO2 contents(>56 wt.%),high La/yb ratios(>20),and low y(yb(y named adakites and defined as granitic magma in convergent plate margins formed by partial melting of subducted young(ydrated oceanic *** studies suggest that these rocks can also be formed in a variety of non-subduction-related tectonic settings through different petrogenetic processes including partial melting of thickened lower continental crust,providing important constraints on crustal growth and evolution throughout the Earth’s *** Tibetan plateau,generally considered as an archetype of collisional orogen,was formed by the successive accretion of different tectonic terranes to the southern margin of the Eurasia plates since the Early ***,the Tibetan plateau comprises several W–E trending terranes(the Kunlun,North Qiangtang,South Qiangtang,and Lhasa terranes)and northernmost India(the Himalaya region).These terranes have undergone significant crustal thickening during the continental collision *** crustal thickness of the Tibetan plateau is asymmetric,being thickest under the Lhasa terrane and thinning more gradually towards the north than to the *** south to north,the crustal thickness increases from^50 km in the Himalaya region,to^70–80 km under the Lhasa terrane,and decreases to^65 km under the North and South Qiangtang terranes and^55 km beneath the Kunlun *** present crustal thickness of the Tibetan plateau has generally been attributed to the Cenozoic collision between the Indian and Eurasian plates and the subsequent intracontinental convergences since^55 ***,doubts were raised about this interpretion in the past few *** example,recent studies indicated the crust of the Lhasa terrane had been significantly thickened during ca.140–130 Ma in

关键词： Tibetan plateau south Qiangtang terrane high-sr/y granitic rocks petrogenesis

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