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Characteristics of sedimentary formations and the preliminary enrichment model of Pb-Zn deposits in the north part of Sanjiang,China

CHEN Jian-ping1,CONG Yuan1,DONG Qing-ji21.Institute of Land Resources and High Techniques,Beijing Key Laboratory of Research and Exploration Information of Land Resources,State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China;2.Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China  
In recent years,many huge potential Pb-Zn deposits have been discovered in the north part of the Sanjiang metallogenic belt,and the Dongmozhazhua Pb-Zn deposit is one of the representative ore deposits.This paper discusses the primarily enriched mineralization materials which are very important to the formation of Pb-Zn mineral deposits in study area.Based on the ore characteristics of the representative ore deposits and the study of the sedimentary environments of Upper Triassic Bolila Formation and Lower-Middle Permian Gadikao Formation,the paper indicates that the structure setting of study area is a back-arc basin from Middle Permian Period to Late Permian Period,and has formed the source bed of mineralization.The structure setting of study area is volcanic arc setting from Early-Middle Triassic Period to Late Triassic Period,and the mineralization is a stratabound pre-concentration type.The exhalative hydrothermal sedimentary mineralization of this basin have caused the mineralization materials such as Pb and Zn etc.primarily enriched from Triassic Period to Permian Period in study area.
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