特提斯喜马拉雅中东部桑秀组酸性火山岩岩石成因：东冈瓦纳大陆裂解的响应？

田京京; 丁枫; 郝盛蓝; 裴向军; 李天涛; 孙瑶; 谢显刚

doi:10.3799/dqkx.2020.363

Volume 46 Issue 11

Nov. 2021

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Article Navigation > Earth Science > 2021 > 46(11): 3926-3944

Tian Jingjing, Ding Feng, Hao Shenglan, Pei Xiangjun, Li Tiantao, Sun Yao, Xie Xiangang, 2021. Petrogenesis of Acidic Volcanic Rocks in Sangxiu Formation, East-Central Segment of Tethyan-Himalaya: Response to Break-up of Eastern Gondwana Continent?. Earth Science, 46(11): 3926-3944. doi: 10.3799/dqkx.2020.363

Citation:

Tian Jingjing, Ding Feng, Hao Shenglan, Pei Xiangjun, Li Tiantao, Sun Yao, Xie Xiangang, 2021. Petrogenesis of Acidic Volcanic Rocks in Sangxiu Formation, East-Central Segment of Tethyan-Himalaya: Response to Break-up of Eastern Gondwana Continent?. Earth Science, 46(11): 3926-3944. doi: 10.3799/dqkx.2020.363

Citation:

Tian Jingjing, Ding Feng, Hao Shenglan, Pei Xiangjun, Li Tiantao, Sun Yao, Xie Xiangang, 2021. Petrogenesis of Acidic Volcanic Rocks in Sangxiu Formation, East-Central Segment of Tethyan-Himalaya: Response to Break-up of Eastern Gondwana Continent?. Earth Science, 46(11): 3926-3944. doi: 10.3799/dqkx.2020.363

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Petrogenesis of Acidic Volcanic Rocks in Sangxiu Formation, East-Central Segment of Tethyan-Himalaya: Response to Break-up of Eastern Gondwana Continent?

doi: 10.3799/dqkx.2020.363

1.
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
2.
College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
3.
School of Earth System Science, Tianjin University, Tianjin 300072, China

Received Date: 2020-12-05
Available Online: 2021-12-04
Publish Date: 2021-11-30

Abstract

Abstract

For a long time, there have been many controversies on whether the acid volcanic rocks of Sangxiu Formation in the central and eastern parts of the Tethyan-Himalaya tectonic belt were formed by crustal anatism and were related to the break-up of East Gondwana continent. In this study, the characteristics of acid volcanic rocks of Sangxiu Formation in YamzhoYumco area were studied. Based on the detailed field geological survey and sample collection, the petrography characteristics, LA-ICP-MS zircon U-Pb geochronology, whole-rock geochemistry and Hf isotope of zircon were investigated. The results show that weighted mean age of the two acid volcanic rock samples (RYA01 and DYA01) at the bottom of Sangxiu Formation in YamzhoYumco area were 139.1±1.3 Ma (1σ, MSWD=1.08) and 137.3±1.4 Ma (1σ, MSWD=0.98), respectively, indicating that the two acid volcanic rock samples were formed by the Early Cretaceous volcanic activity in the Tethyan-Himalaya region. The geochemical and Hf isotopic geochemical characteristics show that the acidic volcanic rocks have high content of SiO₂, low magnesium index, high A/CNK ratio, enrichment of Al, LREE and Th, and strong depletion of Nb. The zircon ε_Hf(t) values range from -20.1 to -10.5, with an average of -13.5. It is revealed that the acid volcanic rocks of Sangxiu Formation in YamzhoYumco area are magmatic products of partial melting of overlying crust induced by mantle derived magma underplating in the northern margin of Indian continent. Combining with the previous study, it is recognized that the genesis of the acid volcanic rocks is related to the rifting of East Gondwana continent. It is the early product of Kerguelen mantle plume.
- petrogenesis,
- acid volcanic rock,
- Sangxiu Formation,
- east-central segment of Tethyan-Himalaya,
- East Gondwana,
- petrology

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References(55)

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Petrogenesis of Acidic Volcanic Rocks in Sangxiu Formation, East-Central Segment of Tethyan-Himalaya: Response to Break-up of Eastern Gondwana Continent?

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