NIU Shuyin1, 2, *, SUN Aiqun1, WANG Baode1, NIE Fengjun3, JIANG Sihong3, SHAO Ji’an4, GUO Lijun5 and LIU Jianming6
1 Geological Survey Institution of Shijiazhuang Economics University, Shijiazhuang, Hebei 050031; 2 China University of Geosciences (Beijing), Beijing 100083; 3 Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037; 4 College of Earth and Space Sciences, Peking University, Beijing 100871; 5 Bureau of Geology and Mineral Resource Development of Inner Mongolia, Hohhot, Inner Mongolia 010020; 6 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029The paper is co-supported by the National Natural Science Foundation Project (No. 40872137, 40372103), Crisis Mines Study Project (No. 20089948) and Inner Mongolia Geological Exploring Important Project (No. 2004-05).
Abstract: 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 ore-forming 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.
Abstract: 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 ore-forming 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.
NIU Shuyin, *, SUN Aiqun, WANG Baode, NIE Fengjun, JIANG Sihong, SHAO Ji’an, GUO Lijun and LIU Jianming.2009. Mantle Branch Structure in the South-Central Segment of the Da Hinggan Mts., Inner Mongolia and Its Ore-controlling Role[J]. ACTA GEOLOGICA SINICA(English edition),83(6):1148~1162
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