SHRIMP zircon U-Pb ages and Hf isotopic compositions of Zhangshiying intrusive complex in the southern margin of the North China Craton and their geological implications

Xiang, JunFeng, Zhao, HaiJie, Li, YongFeng, Cheng, Yanbo, Gao, YaLong, Hou, KeJun, Dong, ChunYan, and Li, XiangQian (2010) SHRIMP zircon U-Pb ages and Hf isotopic compositions of Zhangshiying intrusive complex in the southern margin of the North China Craton and their geological implications. Acta Petrologica Sinica, 26 (3). pp. 871-887.

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Abstract

Zhangshiying intrusive complex (ZIC), consisting of K-feldspar granite, granite porphyry and quartz porphyry, is located in the southern margin of the North China Craton. The mafic enclaves are merely in K-feldspar granite and have textures indicating magma mixing. We obtained their SHRIMP zircon U-Pb ages of 107. 3 ± 2.4Ma, 106. 7 ± 2. 5Ma and 101 ± 3Ma for K-feldspar granite, granite porphyry and quartz porphyry, respectively. According to zircon Hf isotope analyses, their εHf(t) values are -15.96 - -20.80, - 18.97 - -22. 18 and -23. 41 - -27.95 and their corresponding Hf two-stage model ages (tDM2) are 1880-2018 Ma, 1925-2080Ma and 2144 - 2330 Ma One exception is the zircon inherited Archean information with 207Pb/206Pb age of 2.6 Ga, -0. 71 of εHf(t) and 3.0 Ga of tDM2. These data suggest that the source of ZIC is mainly either juvenile crust formed at 1.9 - 2.3Ga or an enriched mantle source with the contribution of Archean continental crust. On integration of regional research results, we suggest that ZIC could form at a regional lithospheric extensional setting which is confined to the existing NE-SW or NW-SE fault zones and is triggered by the drifting direction of the Pacific plate changing to southwest ward.

Item ID: 40119
Item Type: Article (Research - C1)
ISSN: 1000-0569
Keywords: Cretaceous, Pacific plate, Southern margin of the North China Craton, Zhangshiying intrusive complex, zircon Hf isotope, zircon U-Pb age
Date Deposited: 20 Aug 2015 02:18
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040307 Ore Deposit Petrology @ 100%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840199 Mineral Exploration not elsewhere classified @ 100%
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