气候变化领域集成服务门户(CCPortal): Southeastern continuation of the Bangong-Nujiang suture zone: Constraints from Middle Jurassic-Early Cretaceous sedimentary rocks in the western Baoshan block, SW China

CCPortal

DOI	10.1016/j.jseaes.2021.104944
	Southeastern continuation of the Bangong-Nujiang suture zone: Constraints from Middle Jurassic-Early Cretaceous sedimentary rocks in the western Baoshan block, SW China
	Zhang, Jiuyuan; Fan, Weiming; Peng, Touping; Ratschbacher, Lothar
通讯作者	Fan, WM (通讯作者)
发表日期	2021
ISSN	1367-9120
EISSN	1878-5786
卷号	221
英文摘要	The Bangong-Nujiang Ocean (BNO) separated the Lhasa and Qiangtang blocks in Tibet during the Mesozoic. Whether it separated the Tengchong and Baoshan blocks and how it evolved remain debated. The sedimentary rocks from the Middle Jurassic Mengjia and Liuwan formations, Late Jurassic Longhai Formation, and Early Cretaceous Longkan Formation of the western Baoshan block serve to investigate these issues. Geochemical signatures indicate that their sediments were deposited on a passive continental margin, with a collisional provenance identified in the Late Jurassic-Early Cretaceous formations. All the formations show similar detrital zircon U-Pb age groups with the exceptions of the Longhai Formation having minor 190-150 Ma zircons and the Longkan Formation containing abundant 190-150 and 140-120 Ma zircons. Provenance studies indicate that the sediments of the Middle Jurassic formations were sourced from the southern Qiangtang, Baoshan and Simao blocks and the Changning-Menglian suture zone. In contrast, the sediments of the Late Jurassic-Early Cretaceous formations were derived mainly from the Tengchong and Baoshan blocks, with an increasing contribution of the Tengchong-derived materials from Late Jurassic to Early Cretaceous. We infer that the absent, minor and significant contributions from Tengchong-derived sources in the provenance of the Baoshan strata were associated with the BNO that separated the Tengchong and Baoshan blocks during the Middle Jurassic, the initiation of the Tengchong-Baoshan collision in the Late Jurassic, and that the Tengchong and Baoshan blocks had been welded together in the Early Cretaceous, respectively. Therefore, the widely spreaded and subduction-related Early Cretaceous magmatic rocks in the Tengchong block were produced by the eastward subduction of the NeoTethyan Ocean.
关键词	ZIRCON U-PB SOUTHERN LANCANGJIANG ZONE HF ISOTOPIC COMPOSITION DETRITAL ZIRCON TENGCHONG BLOCK TECTONIC EVOLUTION TIBETAN PLATEAU LHASA-QIANGTANG MAJOR-ELEMENT GEOLOGICAL SIGNIFICANCE
英文关键词	Middle Jurassic-Early Cretaceous; Detrital zircon; U-Pb dating; SW China; Bangong-Nujiang Ocean
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000713411700001
来源期刊	JOURNAL OF ASIAN EARTH SCIENCES
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/260259
推荐引用方式 GB/T 7714	Zhang, Jiuyuan,Fan, Weiming,Peng, Touping,et al. Southeastern continuation of the Bangong-Nujiang suture zone: Constraints from Middle Jurassic-Early Cretaceous sedimentary rocks in the western Baoshan block, SW China[J]. 中国科学院青藏高原研究所,2021,221.
APA	Zhang, Jiuyuan,Fan, Weiming,Peng, Touping,&Ratschbacher, Lothar.(2021).Southeastern continuation of the Bangong-Nujiang suture zone: Constraints from Middle Jurassic-Early Cretaceous sedimentary rocks in the western Baoshan block, SW China.JOURNAL OF ASIAN EARTH SCIENCES,221.
MLA	Zhang, Jiuyuan,et al."Southeastern continuation of the Bangong-Nujiang suture zone: Constraints from Middle Jurassic-Early Cretaceous sedimentary rocks in the western Baoshan block, SW China".JOURNAL OF ASIAN EARTH SCIENCES 221(2021).