Timing of Triassic tectonic division and postcollisional extension in the eastern part of the Jiaodong Peninsula

Zhang, Hongyuan, Blenkinsop, Thomas ORCID: https://orcid.org/0000-0001-9684-0749 and Yu, Zhuowei 2020. Timing of Triassic tectonic division and postcollisional extension in the eastern part of the Jiaodong Peninsula. Gondwana Research 83 , pp. 141-156. 10.1016/j.gr.2020.01.018

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Abstract

The Jiaodong Peninsula is a key region for researching the interaction between the North and South China Plates. Tectonic relationships between collision, exhumation of ultra-high-pressure (UHP) slabs, strike-slip faulting and gold mineralization, are still ambiguous. The eastern part of the Jiaodong Peninsula (Eastern Jiaodong), which includes Triassic intrusions and is less affected by the Tan-Lu Fault Zone, is a key area to examine exhumation dynamics in detail. Systematic field mapping and zircon U–Pb dating of Triassic intrusions establishes that: (1) The UHP wedge in the eastern part of the Jiaodong Peninsula can be divided into the lateral and frontal ramps of a thrust and nappe system. Dating of samples from Donglinghou (244.7 ± 4.2 Ma) and Qingyutan (233.8 ± 8.1 Ma) areas indicates that the collision happened at or before the Middle Triassic. (2) Postcollisional extension intrusions including the Shidao granitoid (216.2 ± 2.4 Ma), and the Chengshantou granitoid (cut by a dolerite dyke dated at 210.5 ± 1.0 Ma), generally strike NE and occurred in a metamorphic core complex below the Upper Jiashan-Xiangshui detachment (U-JSXS). (3) Regional faults in the Jiaodong Peninsula exploited syncollisional foliations of the UHP wedge, which resulted in faults dipping towards the NW and SE. The reactivation of the Lower Jiashan-Xiangshui shear zone (L-JSXS) and its overprinting upon the Tan-Lu fault system may have caused another major episode of exhumation of the syncollisional wedge, and could have been responsible for an extensional environment that favored gold mineralization.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Earth and Environmental Sciences
Publisher:	Elsevier
ISSN:	1342-937X
Date of First Compliant Deposit:	12 March 2020
Date of Acceptance:	22 January 2020
Last Modified:	24 Nov 2024 06:45
URI:	https://orca.cardiff.ac.uk/id/eprint/130387

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