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Metallogenic regularity and minerogenetic series of ore deposits in Inner Mongolia and adjacent areas

MAO JingWen,ZHOU ZhenHua,WU Guang,JIANG SiHong,LIU ChengLin,LI HouMin,OUYANG HeGen and LIU Jun(MLR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China)  
In the discipline of ore deposits,minerogenetic series is a kind of academic thought of studying regional metallogeny.It advocates using system theory and activity theory to study ore-forming process and ore deposit association that have been developed in various stages of geological history and in specific tectonic environment.In this study,based on the new understanding of tectonic evolution of Inner Mongolia,the new progresses in geosciences of its adjacent areas,especially a large number of precise mineralization ages data,and the new understanding of the sources of rock-forming and ore-forming materials,the authors divided the ore deposits in Inner Mongolia into 11 metallogenic series:①the Archaean Anshan type metamorphic sedimentary iron deposit metallogenic series(consisting of the Middle Archaean and the Late Archaean series);②the Middle Proterozoic submarine exhalative type lead-zinc-copper-sulfur deposit metallogenic series;③the Mesoproterozoic Bayan Obo REE-Fe-Nb deposit metallogenic series;④the Ordovician-Silurian porphyry copper deposit metallogenic series;⑤the Devonian ophiolite related chromite deposit metallogenic series;⑥the Late Permian-Triassic granite related molybdenum-gold polymetallic deposit metallogenic series;⑦the Triassic-Middle Jurassic porphyry copper deposit metallogenic series;⑧the late Jurassic-Early Cretaceous granite related epithermal type lead-zinc polymetallic deposit metallogenic series in De' erbugan area;⑨The late Jurassic-Early Cretaceous granite related lead-zinc-tin-molybdenum-gold polymetallic deposit metallogenic series in the Da Hinggan Mountains and adjacent areas;⑩the Cenozoic lacustrine sedimentary-evaporation related salt deposit metallogenic series.Furthermore,On the basis of such division,the ore deposit metallogenic series distribution map was drawn up,with a brief discussion on their ore-forming geological background,mineralization characteristics,ore deposits association and spatia-l temporal distribution patterns.The metallogenic series division in this study emphasizes the importance of tectonic events and highlights the coupling between the major tectonic events and the large scale m-i neralization,with the purpose of recognizing the geological background of the mineralization episode on a larger scale.For example,the authors set the two coeval deposits of Duobaoshan and Bainaimiao as a metallogenic series,though it is not clear whether they belonged to the same intermittent arc chain or whether they were split by later tectonic movement.It is worth noting that a lot of minerogenetic series in Inner Mongolia show signif-i cant diachronism.For example,the metallogenic events related to the closure of Paleo-Pacifc Ocean lasted from Late Carboniferous through Permian to Triassic,and those related to the subduction of Mongo-l Okhotsk Ocean lasted from Triassic to Middle Jurassic.
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