新疆东天山红山金矿成矿时代研究  

Mineralization age of the Hongshan gold deposit,East Tianshan,Xinjiang

作　　者：陈文[1] 张彦[1] 赵海滨[2] 韩丹[3] 王成玉[3] 

机构地区：[1]国土资源部同位素地质重点实验室Ar-Ar年代学实验室中国地质科学院地质研究所,北京100037 [2]武警黄金第八支队,新疆乌鲁木齐830057 [3]中国地质科学院矿产资源研究所,北京100037

出　　处：《中国地质》2006年第3期632-640,共9页Geology in China

基　　金：国家重点基础研究发展规划项目(2001CB409807);国家自然科学基金项目(49973003);中国地质调查局地质大调查项目(2000020190118)

摘　　要：红山金矿区位于秋格明塔什—黄山韧性剪切带东段北缘,矿床成因研究表明,红山金矿的形成严格受该韧性剪切带控制,属于与韧性剪切带有关的糜棱岩型、超糜棱岩型矿床。花岗质糜棱岩中角闪石276.3Ma的Ar-Ar坪年龄给出了红山金矿床成矿事件的时代上限。金矿石样品中绢云母246.9Ma和246.5Ma的Ar-Ar坪年龄记录了金矿床主成矿期的时代。糜棱岩中新生白云母246.5Ma的Ar-Ar坪年龄,在误差范围内和金矿石样品中绢云母的Ar-Ar坪年龄完全一致,不仅为红山金矿床的剪切带型成因提供了进一步的佐证,也对金成矿时代给予了进一步的限定。The Hongshan gold field is located at the north edge of the east section of the Qiugemingtashi Huangshan ductile shear zone. The study of the genesis of the Hongshan gold deposit shows that its formation was strictly controlled by this ductile shear zone and that it belongs to a mylonite type or ultramylonite type de- posit related to the ductile shear zone. Homblende in granitic mylonite yields an Ar-Ar plateau age of 276.3 Ma, representing the upper limit of the ore-forming event of the Hongshan gold deposit. Sericite in gold ore samples give Ar-Ar plateau ages of 246.9 and 246.5 Ma, recording the age of the main mineralization stage of the gold deposit. The Ar-Ar plateau age of 246.5 Ma of the neogenic muscovite in mylonite is in agreement within error with that of the sericite in gold ore, which not only provides further evidence for the Hongshan gold deposit being of shear zone type origin but also puts a further constraint on the age of gold mineralization.

关 键 词：成矿时代 AR-AR年龄 糜棱岩型金矿 韧性剪切带 新疆 

分 类 号：P618.51[天文地球—矿床学]