【摘要】 西天山中北段地区铜、金矿产时空分布特征明显.时间上,具明显的区域性成矿特征,成矿作用集中在海西期;空间上,铜矿集中分布于赛里木微地块和伊犁晚古生代裂谷带内,金矿集中分布在裂谷带边部晚古生代中期陆相火山岩带和与板块俯冲作用相关的韧性剪切带上.铜、金成矿受含矿建造、岩浆活动和构造控制,据其成矿和分布特点划分出了5个铜矿集区和2个金矿集区,确定了3个主要成矿阶段的6种矿床共生组合,建立了区域成矿作用模式.更多还原

【Abstract】 As one of the important precious and nonferrous metal ore-forming units in the Paleozoic orogenic belts in China,the mid-north section of the West Tianshan Mountains, including Sailimu micro-massif, Boluohuoluo Early Paleozoic arcs and Yili Late Paleozoic Rift as a result of a complicated tectonic evolution process, is favourable for gold and copper ores forming. Nearly 30 copper-gold polymetallic ore deposits and more than 120 ore spots have been found there. The main genetic types of gold deposits are epithermal ore deposit, ductile shear zone ore deposit and porphyry ore deposit; While the submarine volcanic exhalation-sedimentary deposit, the continental volcanogene hydrothermal ore deposit, the porphyry ore deposit and the skarn ore deposit are as the main type of the copper deposits. The ore-forming processes are obviously controlled by the ore-bearing sedimentary formations, magmatic activities and tectonic types and evolution, showing an obvious special and temporal distributing pattern. The ore-forming actions of Au and Cu ore deposits in the studied area were mainly happened in Hercynian, showing a characteristics of regional ore-forming time. The Cu-ore deposits were mainly formed in Sailimu upwelling area and Yili late Paleozoic rift; while the Au-ore deposits, mainly in the mid-late Paleozoic continental volcanic belt on the edge of Yili rift and in the ductile shear zones related to the North Tianshan oceanic plate subduction in Shenglidaban area. According to these ore-forming feathers, 5 Cu ore-forming centralized areas and 2 Au ore-forming centralized areas are recognized. They are the Sailimu Cu ore-forming centralized area, the Kendenggaoer Cu(Pb、Zn) ore-forming centralized area, the West Arwulale Cu ore-forming centralized area, the east Arwulale Cu(Fe) ore-forming centralized area, the Chabuchaer Cu ore-forming centralized area, the Tulasu Au ore-forming centralized area and the Shenglidaban Au ore-forming centralized area. Six ore paragenetic associations in 3 main ore-forming stages are also defined. They are the porphyry-skarn Cu(Mo) paragenetic association in early Hercynian, the epithermal Au(Ag) paragenetic association, the porphyry-skarn Cu(Fe、Mo) paragenetic association,the submarine volcanic exhalation-sedimentary Cu(Fe) paragenetic association and the ductile shear zone Au(Ag) paragenetic association in middle Hercynian and the continental volcanogene hydrothermal-porpyry Cu paragenetic association in late Hercynian. The Authors also discussed the type, the distribution and the relationship of the main ore-controlling conditions such as the main ore-bearing formations, the magmatic intrusions, the volcanic activities and the types and evolution process of faults, and finally set up a regional ore-forming model for the mid-north section of the West Tianshan Mountains.更多还原