Mineralization Zoning in Yindongzi-Daxigou Barite-Siderite, Silver-Polymetallic Deposits in the Qinling Orogen, China  

作　　者：方维萱 胡瑞忠 黄转莹 

机构地区：[1]Laboratory of Ore Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China,Northwest Geological Exploration Bureau, CNNC, Xi 'an 710054, China [2]Laboratory of Ore Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China

出　　处：《Chinese Journal Of Geochemistry》2001年第1期45-51,共7页中国地球化学学报

基　　金：OurresearchworkwasjointlysupportedbytheStateKeyProjectonFoundationResearchPlanning (SKPFRP ;G19990 432 0 0 )andLaboratoryofOreG

摘　　要：The Yindongzi\|Daxigou strata\|bound barite\|siderite, silver\|polymetallic deposits discovered in the Qinling orogen are hosted within flysch facies in a deep\|water fault\|controlled basin on the passive northern margin of the Qinling microplate. The orebodies occur in a series of hydrothermal depositional rocks. Mineralization zoning is characterized by Fe\|Ba←Ba\|Cu←Pb\|Ag→Cu\|Ag→Pb→Au. This is obviously a gradational transition mineralization from vent\|proximal mineralization to more distal mineralization. In this gradational transition between Chefanggou and Yindongzi, vent\|proximal mineralization consists of silver\|polymetallic orebodies (Pb\|Ag), which is the center of hydrothermal mineralization. The Chefanggou Ba\|Cu ore district in the west and the Yindongzi Cu\|Ag ore district in the east represent vent lateral mineralization. Distal mineralization in the west is represented by the Daxigou Fe\|Ba ore district while distal mineralization in the east is represented by the Pb ore district. Thick massive, laminated barren albite chert and jasperite, sometimes with minor silver\|ploymetallic mineralization of commercial importance, and pyritization in rocks feature more distal mineralization. Geochemical anomalies of Au\|As associations are found in ankerite phyllite and muddy sandstone. Actually, Au deposits are dominantly controlled by the late brittle\|ductile shear zone.The Yindongzi\|Daxigou strata\|bound barite\|siderite, silver\|polymetallic deposits discovered in the Qinling orogen are hosted within flysch facies in a deep\|water fault\|controlled basin on the passive northern margin of the Qinling microplate. The orebodies occur in a series of hydrothermal depositional rocks. Mineralization zoning is characterized by Fe\|Ba←Ba\|Cu←Pb\|Ag→Cu\|Ag→Pb→Au. This is obviously a gradational transition mineralization from vent\|proximal mineralization to more distal mineralization. In this gradational transition between Chefanggou and Yindongzi, vent\|proximal mineralization consists of silver\|polymetallic orebodies (Pb\|Ag), which is the center of hydrothermal mineralization. The Chefanggou Ba\|Cu ore district in the west and the Yindongzi Cu\|Ag ore district in the east represent vent lateral mineralization. Distal mineralization in the west is represented by the Daxigou Fe\|Ba ore district while distal mineralization in the east is represented by the Pb ore district. Thick massive, laminated barren albite chert and jasperite, sometimes with minor silver\|ploymetallic mineralization of commercial importance, and pyritization in rocks feature more distal mineralization. Geochemical anomalies of Au\|As associations are found in ankerite phyllite and muddy sandstone. Actually, Au deposits are dominantly controlled by the late brittle\|ductile shear zone.

关 键 词：热水矿化作用 重晶石矿床 银矿床 菱铁矿床 秦岭造山带 中国 

分 类 号：P575[天文地球—矿物学]