甘肃武山温泉辉钼矿Re-Os同位素定年及其成矿意义
Re-Os Isotopic Dating of Molybdenite and Its Implication for Molybdenum Mineralization of Wenquan Porphyry, Wushan, Gansu Province
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摘要: 温泉钼矿是与印支期花岗岩有关的斑岩型钼矿床。5件辉钼矿的Re-Os同位素定年结果显示,辉钼矿Os模式年龄在212.7±2.6~215.1±2.6 Ma,其加权平均值为214.1±1.1Ma,由ISOPLOT程序获得的等时线年龄为214.4±7.1 Ma。该年龄与温泉岩体的K-Ar年龄223~226 Ma和SHRIMP U-Pb锆石年龄223±7 Ma在误差范围内类似,但偏晚,反映Mo矿化主要发生在岩浆侵入-成岩的晚期阶段。西秦岭富Mo的背景的基底岩石重熔和岩浆的分异演化对Mo的矿化具有重要意义。温泉型钼矿的发现对西秦岭印支期花岗岩成矿潜力评价具有重要的启示和指导作用。
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关键词:
- 温泉钼矿 /
- Re-Os同位素定年 /
- 印支期花岗岩
Abstract: Wenquan molybdenum deposit is a porphyry type mineral deposit related with Indosinian granite.The Re-Os isotope dating by five samples of molybdenite separate shows that the Os model ages ranging from 212.7±2.6 Ma to 215.1±2.6 Ma with weighted average 214.1±1.1 Ma.The isochron age of 214.4±7.1 Ma calculated by ISOPLOT program is consistent with granite ages of 223 to 226 Ma and 223±7 Ma for K-Ar and SHRIMPU-Pb respectively.The isochron age is within limits of error,and slightly later than the granite age.The facts indicate that Mo mineralization generation was in the later stage of the magma a scending and cooling in crust.The indosinian granite distributed in west Qinling was generated by way of remelting of the basement matter of basaltic rocks with high Kcontent induced by Qinling orogenic process and resulted in element redistribution in crust.This is very important to Mo mineralization generation for granite fractional crystallization.The discovery of Wenquan molybdenum mineral depositplays a revealing and directing role to evaluate the metallogenetic potential of the Indosinian granite in west Qinling.-
Keywords:
- Wenquan Mo deposit /
- Re-Os isotopic dating /
- Indosinian granite
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