Late Paleozoic intrusive rocks from the southeastern Lhasa terrane, Tibetan Plateau, and their Late Mesozoic metamorphism and tectonic implications
Late Paleozoic intrusive rocks from the southeastern Lhasa terrane, Tibetan Plateau, and their Late Mesozoic metamorphism and tectonic implications
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青藏高原拉萨地体东南部晚古生代侵入岩及其晚中生代变质作用和构造意义
DOI：
10.1016/j.lithos.2014.04.001
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发表时间：
2014-06
期刊：
影响因子：
3.5
通讯作者：
Lin Yanhao
中科院分区：
文献类型：
--
作者：
Dong Xin;Zhang Zeming;Liu Feng;He Zhenyu;Lin Yanhao
藏南拉萨地体经历了晚古生代和中新生代复合造山作用。本文对拉萨地体东南部晚古生代和晚中生代侵入岩的岩石学、地球化学、锆石U-Pb年代学和Hf同位素进行了研究。晚古生代侵入岩结晶形成于晚泥盆世-早石炭世，形成于弧后伸展环境中的双峰式火成岩组合。镁铁质端元起源于富集型地幔，经历了地壳物质的混染，轻稀土元素略富集，U、K、Pb正异常，Th、Nb、Ta、Ti负异常。长英质端元来自古陆壳的部分熔融作用，其特征为偏铝，Th、Zr、Hf为正异常，Ba、Sr、Nb、Ta、Ti为负异常，锆石εHf(T)值为负，TDM2年龄为1.9~1.40Ga.晚白垩世(约107 Ma)镁铁质侵入岩与晚古生代侵入岩一起，在与拉萨地体之下的新特提斯洋板俯冲相关的安第斯造山作用中，经历了近同步侵入角闪岩相变质作用，P-T为0.56~0.69 GPa，692~735℃。这一研究为拉萨地体的前新生代构造演化提供了新的视角。
The Lhasa terrane in southern Tibet experienced Late Paleozoic and Mesozoic–Cenozoic composite orogenesis. This work reports a study on the petrology, geochemistry, zircon U–Pb chronology and Hf isotopes of Late Paleozoic and Late Mesozoic intrusive rocks from the southeastern Lhasa terrane. The Late Paleozoic intrusive rocks crystallized in the Late Devonian–Early Carboniferous of 371 to 355 Ma, representing a bimodal igneous association formed in the back-arc extensional setting. The mafic end-member originated from the enriched mantle and experienced contamination of crustal materials, characterized by a slight enrichment of LREE, positive anomalies of U, K and Pb and negative anomalies of Th, Nb, Ta and Ti. The felsic end-member was derived from the partial melting of the ancient continental crust, characterized by metaluminous, positive anomalies of Th, Zr and Hf, negative anomalies of Ba, Sr, Nb, Ta and Ti and negative εHf(t) values of zircon with TDM2ages from 1.90 to 1.40 Ga. The Late Cretaceous (ca. 107 Ma) mafic intrusions, along with the Late Paleozoic intrusive rocks, underwent nearly syn-intrusion amphibolite-facies metamorphism under P–T conditions of 0.56 to 0.69 GPa and 692 to 735 °C during the Andean-type orogeny correlated with the subduction of the Neo-Tethyan oceanic slab beneath the Lhasa terrane. This study provides a new insight into the pre-Cenozoic tectonic evolution of the Lhasa terrane.
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影响因子：
3.5
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