气候变化领域集成服务门户(CCPortal): Survived Seamount Reveals an in situ Origin for the Central Qiangtang Metamorphic Belt in the Tibetan Plateau

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DOI	10.1007/s12583-019-1250-9
	Survived Seamount Reveals an in situ Origin for the Central Qiangtang Metamorphic Belt in the Tibetan Plateau
	Liu, Deliang; Shi, Rendeng; Ding, Lin; Jiang, Shao-Yong
通讯作者	Liu, DL ; Jiang, SY (通讯作者)
发表日期	2019
ISSN	1674-487X
EISSN	1867-111X
起始页码	1253
结束页码	1265
卷号	30 期号:6
英文摘要	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.
关键词	PLASMA-MASS SPECTROMETRY HF ISOTOPIC COMPOSITIONS U-PB NORTHERN TIBET ACCRETIONARY COMPLEXES CRUSTAL XENOLITHS MELANGE FORMATION PALEO-TETHYS COSTA-RICA SUBDUCTION
英文关键词	volcanic rock; OIB; central Qiangtang metamorphic belt; Longmu Co-Shuanghu; Tibet
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000492368200001
来源期刊	JOURNAL OF EARTH SCIENCE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259404
推荐引用方式 GB/T 7714	Liu, Deliang,Shi, Rendeng,Ding, Lin,et al. Survived Seamount Reveals an in situ Origin for the Central Qiangtang Metamorphic Belt in the Tibetan Plateau[J]. 中国科学院青藏高原研究所,2019,30(6).
APA	Liu, Deliang,Shi, Rendeng,Ding, Lin,&Jiang, Shao-Yong.(2019).Survived Seamount Reveals an in situ Origin for the Central Qiangtang Metamorphic Belt in the Tibetan Plateau.JOURNAL OF EARTH SCIENCE,30(6).
MLA	Liu, Deliang,et al."Survived Seamount Reveals an in situ Origin for the Central Qiangtang Metamorphic Belt in the Tibetan Plateau".JOURNAL OF EARTH SCIENCE 30.6(2019).