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Geochemistry of the Mesoproterozoic Intrusions, Geochronology and Isotopic Constraints on the Xiaonanshan Cu-Ni Deposit along the Northern Margin of the North China Craton

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Journal of Earth Science 2020年第4期31卷 653-667页

作者： Zhiguang Zhou Jiangwei Yi Niu Guosheng Wang Chen Wu Changfeng Liu Juncheng Ju School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China Institute of Geological Surveyy China University of Geosciences Beijing 100083China Minmetals Exploration&Development Co. Ltd.Beijing 100010China Tianjin Institute of Geological Survey Tianjin 300191China Exploration and Development Research Institute of Petro China Liaohe Oilfield CompanyPanjin 124000China

Mesoproterozoic magma events in the bayan obo rift belt have remained poorly constrained and as a result, the Late Paleoproterozoic–Mesoproterozoic tectonic evolution of the rift belt has remained unclear. By a multiple-facetted regional geological investigation of this belt, we have resolved the stratigraphic sequence and geochronology of the bayan obo Group and made new discoveries including a three-stage mantle-derived magmatic sequence. Zircon and baddeleyite dating of Xiaonanshan hornblende pyroxenite emplaced into the bayan obo Group yields 207Pb/206Pb ages of ca. 1.34 and 1.33 Ga. The geochronological, geochemistry, Hf isotopic analyses place an important constraint on ages of the Late Paleoproterozoic–Mesoproterozoic strata and the evolution of the rift belt. Our field observations and U-Pb dating results suggest that mineralization is genetically related to Mesoproterozoic magmatism in North China Craton, i.e., 1.33–1.34 Ga. The δ34SV-CDT values of sulphide from the ore-bearing ultra-/mafic samples are about 6.2‰, whereas the 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb values vary in the ranges of 17.598–18.115, 15.496–15.501, and 37.478–37.952, respectively. The Late Paleozoic mafic gabbro and acidic granite porphyry intrusions are possible to bimodal magmatic event related to the extensional tectonic setting of the Central Asia in this period.

关键词： bayan obo rift belt North China Craton Late Paleoproterozoic-Mesoproterozoic tectonic evolution Mesoproterozoic mineralization Pb-S isotopic analysis

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