北祁连水洞峡蛇绿岩形成时代与构造环境

郭晶; 李云帅; 张建新; 路增龙

doi:10.3799/dqkx.2020.176

Volume 46 Issue 5

May 2021

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Guo Jing, Li Yunshuai, Zhang Jianxin, Lu Zenglong, 2021. Age and Tectonic Affinity of Shuidongxia Ophiolite in North Qilian Orogen. Earth Science, 46(5): 1644-1656. doi: 10.3799/dqkx.2020.176

Citation:

Guo Jing, Li Yunshuai, Zhang Jianxin, Lu Zenglong, 2021. Age and Tectonic Affinity of Shuidongxia Ophiolite in North Qilian Orogen. Earth Science, 46(5): 1644-1656. doi: 10.3799/dqkx.2020.176

Guo Jing, Li Yunshuai, Zhang Jianxin, Lu Zenglong, 2021. Age and Tectonic Affinity of Shuidongxia Ophiolite in North Qilian Orogen. Earth Science, 46(5): 1644-1656. doi: 10.3799/dqkx.2020.176

Citation:

Guo Jing, Li Yunshuai, Zhang Jianxin, Lu Zenglong, 2021. Age and Tectonic Affinity of Shuidongxia Ophiolite in North Qilian Orogen. Earth Science, 46(5): 1644-1656. doi: 10.3799/dqkx.2020.176

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Age and Tectonic Affinity of Shuidongxia Ophiolite in North Qilian Orogen

doi: 10.3799/dqkx.2020.176

Guo Jing^{1
,
,},
Li Yunshuai^{2
,
,
,},
Zhang Jianxin³,
Lu Zenglong³

1.
College of Architectural and Surveying Engineering, Shanxi Datong University, Datong 037001, China
2.
School of Earth System Science, Institute of Surface-Earth System Science, Tianjin University, Tianjin 300072, China
3.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

Received Date: 2020-08-27
Publish Date: 2021-05-15

Abstract

Abstract

The spatial relationship and tectonic affinity of the ophiolite can provide key evidence for the evolution of the subduction zone and paleo-tectonic reconstruction. Ophiolite in Shuidongxia is an important part of the southern belt of the North Qilian orogen, however, the age and tectonic setting are poorly constrained. Zircon grains from the gabbro yield a weighted mean ²⁰⁶Pb/²³⁸U age 497.0±2.4 Ma (MSWD=0.84), indicating the Shuidongxia ophiolite formed in the Late Cambrian, which is consistent with the ages of ophiolites in the southern belt of the North Qilian orogen. The mineralogical characteristics as well as the whole-rock geochemistry of gabbro, serpentinite and basalt suggest that the Shuidongxia ophiolites are closely related to subduction zone. Combined with the regional geology of the North Qilian orogen, it is suggested that the Yushigou-Shuidongxia ophiolite belongs to SSZ-type and obducted southward onto the central Qilian block during the arc-continent collision.
- zircon U-Pb dating,
- SSZ-type,
- Shuidongxia ophiolite,
- North Qilian orogen,
- geochemistry

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References(66)

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