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mantle branch Structure in the South-Central Segment of the Da Hinggan Mts.,Inner Mongolia and Its Ore-controlling Role

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Acta Geologica Sinica(English Edition) 2009年第6期83卷 1148-1162页

作者： NIU Shuyin SUN Aiqun WANG Baode NIE Fengjun JIANG Sihong SHAO Ji＇an GUO Lijun LIU Jianming Geological Survey Institution of Shijiazhuang Economics University Shijiazhuang Hebei 050031 China University ofGeosciences （Beijing） Beijing 100083 Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037 College of Earth and Space Sciences Peking University Beijing 100871 Bureau of Geology and Mineral Resource Development oflnner Mongolia Hohhot Inner Mongolia 010020 Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029

mantle branch structure is the third tectonic unit of multiple evolution of a mantle branch. It is not only the main mechanism of intercontinental orogeny, but also an important ore-forming and ore-control structure. Studies on geotectonic evolution, regional geological characteristics and oreforming and ore-control structures have shown that since the Mesozoic the Da Hinggan Mts. region has entered a typical intercontinental orogenic stage, and it is closely related to mantle branch activities. The south-central segment of the Da Hinggan Mts. is a typical mantle branch structure and possesses obvious magmatic-metamorphic complexes in the core, detachment slip beds in the periphery and overlapped fault depression basins. Moreover, all of these are the principal factors leading to ore formation and ore control in the region. This paper also further explores the mechanism of mineralization in the south-central segment of the Da Hinggan, summaries the rules of mineralization, puts forward the models of mineralization and points out future ore-exploring orientation.

关键词： mantle branch structure mantle branch metallogenic model Da Hinggan Mts.

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Study on the Metallogenetism of Sub-mantle Plume and mantle branches in the Gold Mineralization Concentration Area of Northwest Jiaodong Peninsula

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Acta Geologica Sinica(English Edition) 2014年第5期88卷 1409-1420页

作者： NIU Shuyin CHENG Guangsuo ZHANG Jianzhen SUN Aiqun MA Baojun ZHANG Fuxiang WANG Baode XU Meng WU Jichun ZHAO Rongxin WANG Shanfei Key Laboratory of Gold Mineralization Processes and Resource Utilization Subordinated to the Ministry of Land and Resources Shijiazhuang University of Economics Shandong Gold Group Co. Ltd.

The northwest of Jiaodong peninsula is characterized by its greatest gold concentration area, enormous gold reserves and limited time interval （115±5Ma） of gold mineralization in China. Studies show that the east area of north China began its mantle plume evolution since the Yanshanian movement, and the Laiyang sub-mantle plume and its surrounding mantle branches such as those in Guojiadian, Aishan and Panshidian were formed in the mineralization concentration area of northwestern Jiaodong peninsula. With the development of mantle plume →sub-mantle plume → mantle branch→ favorable expending structures, the deep-derived hydrothermal fluid moved up to the favorable places, such as brittle-ductile or ductile-brittle shearing zones, the internal and external contact zones of intrusions, dense fracturing zones and the contact zones between dikes and countryrocks, and concentrated into deposits. Then the gold mineralization concentration zones that are centralized on mantle branches were formed. This study takes Guojiadian mantle branch as an example to discuss their metallogenetism and conclude the metallogenetic mode.

关键词： sub-mantle plume mantle branch ore-controlling structure metallogenetism,metallogenetic mode northwest Jiaodong peninsula

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