Survived Seamount Reveals an <i>in situ</i> Origin for the Central Qiangtang Metamorphic Belt in the Tibetan Plateau

Deliang Liu; Rendeng Shi; Lin Ding; Shao-Yong Jiang

doi:10.1007/s12583-019-1250-9

Volume 30 Issue 6

Dec 2019

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Journal of Earth Science > 2019 > 30(6): 1253-1265.

Deliang Liu, Rendeng Shi, Lin Ding, Shao-Yong Jiang. Survived Seamount Reveals an in situ Origin for the Central Qiangtang Metamorphic Belt in the Tibetan Plateau. Journal of Earth Science, 2019, 30(6): 1253-1265. doi: 10.1007/s12583-019-1250-9

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Deliang Liu, Rendeng Shi, Lin Ding, Shao-Yong Jiang. Survived Seamount Reveals an in situ Origin for the Central Qiangtang Metamorphic Belt in the Tibetan Plateau. Journal of Earth Science, 2019, 30(6): 1253-1265. doi: 10.1007/s12583-019-1250-9

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Survived Seamount Reveals an in situ Origin for the Central Qiangtang Metamorphic Belt in the Tibetan Plateau

doi: 10.1007/s12583-019-1250-9

Deliang Liu^{1,2
,
,
,},
Rendeng Shi²,
Lin Ding²,
Shao-Yong Jiang^{1
,
,
,}

1.
State Key Laboratory of Geological Processes and Mineral Resources, Collaborative Innovation Center for Exploration of Strategic Mineral Resources, School of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China

More Information

Corresponding author: Deliang Liu; Shao-Yong Jiang
Received Date: 08 Oct 2019
Accepted Date: 21 Oct 2019
Publish Date: 01 Dec 2019

Abstract

Abstract

The origin of the central Qiangtang metamorphic belt (CQMB) has long been in debate, which is not clear whether this belt is the exhumed Jinsha oceanic plate that had been subducted and underthrusted beneath the Qiangtang Block, or the in situ Longmu Co-Shuanghu suture that separated the south and north Qiangtang blocks. Here we report field observations, zircon U-Pb ages and Lu-Hf isotopes, as well as whole rock geochemistry and Sr-Nd isotopes of the Late Triassic volcanic rocks near the Chabo Co within the southern margin of the CQMB. The ca. 229 Ma Chabo Co volcanic rocks and limestones possess characteristic lithologies of a seamount. Their geochemical and isotopic compositions are similar to OIB-type lavas. Unlike other metabasalts (eclogites and blueschists) in the CQMB, the Chabo Co volcanic rocks are OIB-type lavas that did not experience high-grade metamorphism; this is likely because that the Chabo Co seamount was detached from the subducting Longmu Co-Shuanghu oceanic slab. This work provides new solid evidences for an in situ origin of the CQMB.
- volcanic rock,
- OIB,
- central Qiangtang metamorphic belt,
- Longmu Co-Shuanghu,
- Tibet

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References(56)

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