Evolved Late Mesozoic continental arc: Constraints of detrital zircons from the western East China Sea

被引：2
|
作者：
Deng, Yuling [1 ]
Xu, Changhai [1 ,4 ]
Gao, Shunli [2 ]
Fu, Qiang [1 ]
Li, Yuanyuan [3 ]
机构：
[1] Tongji Univ, Sch Ocean & Earth Sci, State Key Lab Marine Geol, Shanghai, Peoples R China
[2] CNOOC China Ltd Shanghai, Shanghai, Peoples R China
[3] Tongji Univ, Lib, Shanghai, Peoples R China
[4] Tongji Univ, Sch Ocean & Earth Sci, 1239 Siping Rd, Shanghai 200092, Peoples R China
来源：
INTERNATIONAL GEOLOGY REVIEW | 2024年 / 66卷 / 08期
基金：
中国国家自然科学基金;
关键词：
magmatic arc; detrital zircon; Late Mesozoic; Izanagi subduction; TECTONIC SETTING DISCRIMINATION; U-PB GEOCHRONOLOGY; SOUTH CHINA; TRACE-ELEMENT; JIANGNAN OROGEN; MAGMATIC ARC; DEPOSITIONAL ENVIRONMENT; GEOCHEMICAL EVIDENCE; TAIWAN IMPLICATIONS; SOUTHEASTERN CHINA;
D O I：
10.1080/00206814.2023.2243490
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
The Late Mesozoic subduction of Izanagi slab beneath East Asia formed large-scale intraplate magmatism in SE South China and subduction melanges outcropped in SW Japan to eastern Taiwan Island, but the accompanying arc remains uncertain. We conducted LA-ICP-MS U-Pb zircon dating and trace element analyses of proximal sandstones from the SW East China Sea to trace a Jurassic to Cretaceous magmatic arc. Newly acquired data reveal that arc magmatism mostly developed in episodes of 150-124 and 124-102 Ma, exhibiting characteristics of low-T, high Th/U, U/Yb, Sc/Yb, Th/Nb, and low Nb/Yb, Nb/Hf ratios. This magmatic arc, combined with the SE South China intraplate and residual subduction melanges, spatially forms a Late Mesozoic trench-arc-intraplate architecture responding to the Izanagi subduction. Its identified tectonic scenarios mainly include slab strike-slip subduction (200-170 Ma), slab stagnation and intraplate foundering (170-150 Ma), slab rollback and arc-root removal (150-102 Ma), and arc migration (102-86 Ma). Both the western East China Sea and Cathaysia block share a unified Paleoproterozoic basement that formed at ca. 1.85 Ga, and the Cathaysia-based magmatic arc occurred then.
引用
收藏
页码：1479 / 1500
页数：22
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