气候变化领域集成服务门户(CCPortal): Forced subduction initiation within the Neotethys: An example from the mid-Cretaceous Wuntho-Popa arc in Myanmar

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DOI	10.1130/B35818.1
	Forced subduction initiation within the Neotethys: An example from the mid-Cretaceous Wuntho-Popa arc in Myanmar
	Zhang, Liyun; Fan, Weiming; Ding, Lin; Pullen, Alex; Ducea, Mihai N.; Li, Jinxiang; Wang, Chao; Xu, Xiaoyan; Sein, Kyaing
通讯作者	Zhang, LY (通讯作者)
发表日期	2022
ISSN	0016-7606
EISSN	1943-2674
起始页码	849
结束页码	870
卷号	134 期号:3-4
英文摘要	Despite decades of research, the mechanisms and processes of subduction initiation remain obscure, including the tectonic settings where subduction initiation begins and how magmatism responds. The Cretaceous Mawgyi Volcanics represent the earliest volcanic succession in the Wuntho-Popa arc of western Myanmar. This volcanic unit consists of an exceptionally diverse range of contemporaneously magmatic compositions which are spatially juxtaposed. Our new geochemical data show that the Mawgyi Volcanics comprise massive mid-oceanic ridge basalt (MORB)-like lavas and dikes, and subordinate island arc tholeiite and calc-alkaline lavas. The Mawgyi MORB-like rocks exhibit flat rare earth elements (REEs) patterns and are depleted in REEs, high field strength elements (except for Th) and TiO2 concentrations relative to those of MORBs, resembling the Izu-Bonin-Mariana protoarc basalts. Our geochronological results indicate that the Mawgyi Volcanics formed between 105 and 93 Ma, coincident with formation of many Neotethyan supra-subduction zone ophiolites and intraoceanic arcs along orogenic strike in the eastern Mediterranean, Middle East, Pakistan, and Southeast Asia. Combined with its near-equatorial paleo-latitudes constrained by previous paleomagnetic data, the Wuntho-Popa arc is interpreted as a segment of the north-dipping trans-Neotethyan subduction system during the mid-Cretaceous. Importantly, our restoration with available data provides new evidence supporting the hypothesis of a mid-Cretaceous initiation of this >8000-km-long subduction system formed by inversion of the similar to E-W-trending Neotethyan oceanic spreading ridges, and that this was contemporaneous with the final breakup of Gondwana and an abrupt global plate reorganization.
关键词	IZU-BONIN-MARIANA ZIRCON U-PB INDO-BURMA RANGE FORE-ARC TECTONIC EVOLUTION HYDROTHERMAL ALTERATION PHILIPPINE SEA ISOTOPIC CONSTRAINTS NORTHERN PAKISTAN DETACHMENT FAULTS
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000764352900002
来源期刊	GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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/260729
推荐引用方式 GB/T 7714	Zhang, Liyun,Fan, Weiming,Ding, Lin,et al. Forced subduction initiation within the Neotethys: An example from the mid-Cretaceous Wuntho-Popa arc in Myanmar[J]. 中国科学院青藏高原研究所,2022,134(3-4).
APA	Zhang, Liyun.,Fan, Weiming.,Ding, Lin.,Pullen, Alex.,Ducea, Mihai N..,...&Sein, Kyaing.(2022).Forced subduction initiation within the Neotethys: An example from the mid-Cretaceous Wuntho-Popa arc in Myanmar.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,134(3-4).
MLA	Zhang, Liyun,et al."Forced subduction initiation within the Neotethys: An example from the mid-Cretaceous Wuntho-Popa arc in Myanmar".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 134.3-4(2022).