拉萨地体东南部整体地壳成分及其成因分析

郭京梁; 张宏飞; 徐旺春; 郭亮; 吴耀; 崔丹丹

doi:10.3799/dqkx.2019.050

Volume 44 Issue 6

Jun. 2019

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Article Navigation > Earth Science > 2019 > 44(6): 1809-1821

Guo Jingliang, Zhang Hongfei, Xu Wangchun, Guo Liang, Wu Yao, Cui Dandan, 2019. The Bulk Crustal Composition of the Southeastern Lhasa Terrane and Its Origin. Earth Science, 44(6): 1809-1821. doi: 10.3799/dqkx.2019.050

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Guo Jingliang, Zhang Hongfei, Xu Wangchun, Guo Liang, Wu Yao, Cui Dandan, 2019. The Bulk Crustal Composition of the Southeastern Lhasa Terrane and Its Origin. Earth Science, 44(6): 1809-1821. doi: 10.3799/dqkx.2019.050

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The Bulk Crustal Composition of the Southeastern Lhasa Terrane and Its Origin

doi: 10.3799/dqkx.2019.050

Guo Jingliang^{1,2
,
,},
Zhang Hongfei^1,2,
Xu Wangchun^1,2,
Guo Liang^1,2,
Wu Yao²,
Cui Dandan^1,2

1.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2018-09-30
Publish Date: 2019-06-15

Abstract

Abstract

The structure and composition of orogenic belts are important for understanding the chemical evolution of the continental crust and the background for metallogenesis. This study integrates previously published crustal seismic structures, experimentally determined petrophysical properties of various rock types, and geochemical data of magmatic rocks from the southeastern Lhasa Terrane, in order to discuss the compositional features of the continental crust in this region and their possible causes. The average crustal seismic velocity in this region is lower than the average values of global continental crust and orogenic belts, suggesting a more felsic composition for the bulk continental crust. Moreover, the lower crust could also be composed of intermediate rocks (restitic intermediate garnet granulite). The felsic bulk crustal composition of the southeastern Lhasa terrane is supposed to be related to multiple episodes of felsification, including the pre-collisional continental arc evolution stage (mainly by delamination of cumulate or restitic lower crust) and the post-collisional plateau collapsing stage (mainly by delamination of thickened lower crust, which is accompanied by the relamination/tectonic underthrusting of felsic materials from the ancient Indian continental crust). The Lhasa terrane is one of the best places to study the chemical differentiation of continental crust, which demands further comprehensive studies of multiple disciplines.
- continental crust,
- chemical differentiation,
- foundering,
- Nd isotopes,
- Gangdese,
- Tibetan Plateau,
- petrology

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References(92)

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