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矿床地质  2009 

新疆坡北基性-超基性岩带10号岩体SHRIMPU-Pb和矿石Re-Os同位素定年及其意义

Keywords: 地球化学,坡北10号北基性-超基性岩体,锆石,SHRIMPU-Pb定年,Re-Os同位素定年,Sr-Nd同位素特征,新疆

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Abstract:

坡北基性-超基性岩带10号岩体位于塔里木板块东北部北山裂谷带内,岩体侵位于下石炭统红柳园组。前人根据岩体侵位地层的时代,间接推断出该岩体形成年龄为晚石炭世—早二叠世。文章对坡北基性-超基性岩带的10号岩体辉长岩和浸染状矿石分别进行了锆石SHRIMPU-Pb、Re-Os定年和Sr-Nd同位素示踪研究,获得岩体的辉长岩锆石SHRIMPU-Pb年龄信息比较分散,其表面年龄信息从古生代—新元古代—古元古代—新太古代均有显示,揭示了新疆塔里木板块东北部北山裂谷带内的基性-超基性岩体的形成经历了复杂的地质演化历史。所获得的主体锆石的年龄为(289±13)Ma(95%可信度),与岩体侵位于下石炭统红柳园组的地质事实相吻合,可能代表了岩体形成的时间,而年龄信息(2559~2589Ma)暗示了北山地区可能存在古元古代—新太古代的结晶基底。获得浸染状铜镍硫化物矿石的Re-Os等时线年龄为(413±20)Ma(95%可信度),该年龄不仅大于含矿超基性岩体(289Ma)的形成时代,而且也老于岩体所侵入的下石炭统红柳园组的地层时代,显然与宏观的地质证据相悖。Sr-Nd和Os同位素特征研究表明,坡北岩带在约280Ma前成岩成矿时,岩浆在从地幔源区侵入到地壳过程中受到了地壳物质混染,致使浸染状矿石的Re-Os同位素体系呈二元混合体系,因此浸染状矿石Re-Os同位素体系确定的等时线疑为假等时线,其年龄不能代表矿床形成时代或不具有确切的地质意义。铜镍矿化无论从时间上还是空间上都与岩体的侵位密切相关,矿床成因类型又为岩浆熔离型矿床,表明坡北10号铜镍硫化物矿床的成岩成矿时间应发生在晚石炭世—早二叠世期间,是后碰撞构造背景下幔源岩浆上侵的产物。

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