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地质论评  2006 

豫西雷门沟斑岩钼矿SHRIMP锆石U―Pb和辉钼矿Re―Os测年及其地质意义

Keywords: SHRIMP锆石U―Pb年龄Re-Os同位素东秦岭雷门沟钼矿

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Abstract:

首次采用SHRIMP锆石微区U-Pb测年技术,对雷门沟花岗斑岩体进行年代学研究,通过对花岗斑岩中单颗粒锆石25个样品点的分析,获得了两组年龄数据,其中有11个分析点形成谐和年龄,其206Pb/238U年龄范围在129.1±3.0~138.4±2.3Ma之间,加权平均值为136.2±1.5Ma;另外9个分析点的207Pb/206Pb年龄集中于1884±20~2629±7Ma;前者指示了雷门沟岩体的结晶年龄为侏罗纪―白垩纪之交。后者则代表了岩体侵位过程中捕获的太华群锆石的年龄。首次采用ICP-MS法测定雷门沟斑岩型钼矿中的辉钼矿Re-Os同位素年龄,获得其模式年龄为131.6±2.0~133.1±1.9Ma,加权平均值为132.4±1.9Ma,指示了雷门沟钼矿床的成矿年龄。两种精测方法获得的年龄相吻合,成岩与成矿大致同时或成矿略晚于成岩。测试结果表明雷门沟斑岩钼矿与金堆城等东秦岭钼矿带其他钼矿床基本同时形成。

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