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

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

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  • NSTL
  • Elsevier
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.

Paleoproterozoic zircon xenocrysts Hf-OOceanic slab subductionQiyugou Au orefieldTrans-North China OrogenU-PB AGESOUTHERN MARGINTAIHUA COMPLEXLU-HFGEOLOGICAL SIGNIFICANCEMETAMORPHIC EVOLUTIONCRATON IMPLICATIONSTECTONIC EVOLUTIONCONTINENTAL-CRUSTWORKING REFERENCE

Wang, Peng、Mao, Jingwen、Ye, Huishou、Zhao, Guochun、He, Sheng、Yan, Jianming、Wu, Shaokui、Wan, Limin、Zhao, Xijiang

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China Univ Geosci

Chinese Acad Geol Sci

Univ Hong Kong

Beijing Res Inst Uranium Geol

Henan Jinyuan Gold Min Co Ltd

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2022

10.1016/j.precamres.2021.106499

Precambrian Research

Precambrian Research

SCI
ISSN：0301-9268
年,卷(期)：2022.368
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