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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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Druse Calcite Crystals Formed by Mesoproterozoic Paleo-Earthquake Activity in the Northern Margin of the North China Craton

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Journal of Earth Science 2024年第2期35卷 514-524页

作者： Yueshuang Du Zhiguang Zhou Guosheng Wang Chen Wu Wenchao Xu School of Earth Sciences and Resources China University of GeosciencesBeijing100083China Key Laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau Researchand Center for Excellence in Tibetan Plateau Earth SciencesChinese Academy of SciencesBeijing100101China No.1 Institute of Geological and Mineral Resources Survey Henan Bureau of Geo-Exploration&Mineral DevelopmentLuoyang471000China

The Meso-neoproterozoic Bayan Obo rift is located along the northern margin of the North China Craton,and was associated with the break-up of the Columbia *** rift evolution,syn-sedimentary deformation occurred due to tectonic activity and *** events are recorded in the Jianshan Formation of the Bayan Obo Group,inner mongolia,as soft sediment deformation structures in the central Bayan Obo *** calcite crystals and collapse breccias in the Jianshan Formation may provide information on the rift *** druse calcite crystals are idiomorphic-columnar in shape and associated with graphite,pyrite,and quartz.δ^(13)C values of the graphite are−20‰,indicative of biogenic deoxygenation and formation in *** druse calcite crystals are inorganic in origin and formed in water at a temperature of 55℃,based on calciteδ^(13)C andδ^(18)O *** calcite grew in paleo-caves containing fault breccias,with heat derived from *** such,the druse calcite crystals are important evidence for seismic *** collapse breccias(i.e.,fault breccias)and other indicators of slip show that displacement occurred from NE to SW,which is different from the paleocurrent direction in the Jianshan *** thickness of the collapse breccia is∼200 m,which represents the height of the fault *** strike of the fault scarp was NE-SW,based on the distribution of the collapse *** Bayan Obo and Yanliao rifts experienced rapid NW-SE extension,and developed similar deformation structures at ca.1.6 Ga related to break-up of the Columbia supercontinent.

关键词： North China Craton druse calcite crystals paleo-earthquake activity collapse breccia Bayan Obo rift Proterozoic

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Druse calcite crystals formed by Mesoproterozoic paleo-earthquake activity in the northern margin of the North China Craton

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Journal of Earth Science 2021年

作者： Yueshuang Du Zhiguang Zhou Guosheng Wang Chen Wu Wenchao Xu School of Earth Sciences and Resources， China University of Geosciences (Beijing) Key Laboratory of Continental Collision and Plateau Uplift， Institute of Tibetan Plateau Research， and Center for Excellence in Tibetan Plateau Earth Sciences， Chinese Academy of Sciences No.1 Institute of Geological and Mineral Resources Survey， Henan Bureau of Geo-exploration & Mineral Development

The Meso–Neoproterozoic Bayan Obo Rift is located along the northern margin of the North China Craton， and was associated with the break-up of the Columbia supercontinent. During rift evolution， syn-sedimentary deformation occurred due to tectonic activity and earthquakes. Seismic events are recorded in the Jianshan Formation of the Bayan Obo Group， inner mongolia， as soft sediment deformation structures in the central Bayan Obo Rift. Druse calcite crystals and collapse breccias in the Jianshan Formation may provide information on the rift evolution. The druse calcite crystals are idiomorphic–columnar in shape and associated with graphite， pyrite， and quartz. δ13C values of the graphite are –20‰， indicative of biogenic deoxygenation and formation in water. The druse calcite crystals are inorganic in origin and formed in water at a temperature of 55?C， based on calcite δ13C and δ18O data. The calcite grew in paleo-caves containing fault breccias， with heat derived from faulting. As such， the druse calcite crystals are important evidence for seismic events. The collapse breccias （i.e.， fault breccias） and other indicators of slip show that displacement occurred from NE to SW， which is different from the paleocurrent direction in the Jianshan Formation. The thickness of the collapse breccia is ～200 m， which represents the height of the fault scarp. The strike of the fault scarp was NE–SW， based on the distribution of the collapse breccia. The Bayan Obo and Yanliao rifts experienced rapid NW–SE extension， and developed similar deformation structures at ca. 1.6 Ga related to break-up of the Columbia supercontinent.

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