Zircon xenocryst Hf-O isotopic compositions in the Qiyugou Au orefield: A record of Paleoproterozoic oceanic slab subduction in the Trans-North China Orogen

Wang, Peng ¹Mao, Jingwen ¹Ye, Huishou ²Zhao, Guochun ³He, Sheng ⁴Yan, Jianming ⁵Wu, Shaokui ⁵Wan, Limin ⁵Zhao, Xijiang⁵

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作者信息

1. China Univ Geosci
2. Chinese Acad Geol Sci
3. Univ Hong Kong
4. Beijing Res Inst Uranium Geol
5. Henan Jinyuan Gold Min Co Ltd
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Abstract

The Trans-North China Orogen (TNCO) is suggested to form under a transition from subduction to collision from 2500 Ma to ~ 1850 Ma, and the Taihua TTG gneiss in the Xiong'ershan district is thought to have formed in an Andean-type continental arc setting or island arc setting during this geological event. However, to date, the geochemical record of the subducted oceanic slab is still lacking. This study focuses on Hf-O isotopic analyses of zircon xenocrysts from the Qi189 hornblende monzogranite, Qiyugou Au orefield, TNCO. The results reveal that zircon xenocrysts with ages from 2304 Ma to 1934 Ma generally have low-delta O-18 values from 2.66 parts per thousand & nbsp; to 3.83 parts per thousand & nbsp; and high-epsilon Hf(t) values from 2.7 to 7.8. These zircon grains were generated from remelting of high-temperature altered gabbroic rocks of the subducted oceanic slab during the transition from compression to extension. In this paper, we present new evidence for Paleoproterozoic oceanic slab subduction in the TNCO.

Key words

Paleoproterozoic zircon xenocrysts Hf-O/Oceanic slab subduction/Qiyugou Au orefield/Trans-North China Orogen/U-PB AGE/SOUTHERN MARGIN/TAIHUA COMPLEX/LU-HF/GEOLOGICAL SIGNIFICANCE/METAMORPHIC EVOLUTION/CRATON IMPLICATIONS/TECTONIC EVOLUTION/CONTINENTAL-CRUST/WORKING REFERENCE

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出版年

2022

Precambrian Research

SCI

ISSN：0301-9268

被引量4

参考文献量83

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