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地质学报  2005 

新疆哈密白石泉铜镍矿区基性―超基性岩的形成时代及其地质意义

, PP. 498-502

Keywords: 白石泉铜镍矿,SHRIMPU-Pb年代学,中天山,基性―超基性岩体

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Abstract:

白石泉铜镍矿床位于中天山地块北缘,沙泉子深大断裂南侧。矿体产于同源同期侵入的中基性―超基性岩体内,其含矿岩石为单辉橄榄岩和斜长橄辉岩。铜镍矿化无论从时间上和空间上都与岩体的侵位密切相关,矿床成因类型为岩浆熔离型铜镍硫化物矿床。锆石SHRIMP微区原位U-Pb年代学研究表明,石英闪长岩的年龄为285±10Ma、辉长闪长岩年龄为284±9Ma和辉长岩年龄为284±8Ma。三者在测定误差范围内十分一致,表明该含矿杂岩体的侵位及矿化作用均发生于晚石炭世末―早二叠世初,成岩成矿的动力学背景为造山期后伸展构造环境。

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