首页> 中文期刊> 《岩石学报》 >西藏波龙斑岩铜金矿床的Re-Os同位素年龄及其地质意义

西藏波龙斑岩铜金矿床的Re-Os同位素年龄及其地质意义

         

摘要

Bolong porphyry Cu-Au deposit, neighbouring Duobuza porphyry Cu-Au deposit, is a newly discovered deposit Two stages of granodiorite porphyries were emplaced in Bolong deposit, and followed by later intruding granite porphyry. Phyllic alteration is occurring on the surface of Bolong deposit, and potassic alteration was found in the depth associating with granodiorite porphyries. At Bolong, Re-Os data of four molybdenite samples from quartz-molybednite veinlets yielded an isochron age at 119.4 ± 1. 3 Ma ( MSWD = 0.63, n = 4), coincident to the mineralization age of Duobuza deposit Similar mineralization age, closely neighbouring spatial distribution of Bolong and Duobuza porphyry deposits suggest that these two deposits might be generated from a same tectonic-magmatic activity background, and some potential large porphyry copper deposits could be occurred in Duolong metallogenic district%波龙斑岩铜金矿紧邻多不杂矿床,是多龙矿集区内新发现的一个超大型矿床.波龙矿床早期有两次成矿花岗闪长斑岩侵位,随后较晚期花岗斑岩侵位;地表广泛分布绢英岩化蚀变,深部发育钾化.本文对采于波龙斑岩型铜金矿床内石英-辉钼矿脉中的4件辉钼矿样品进行了Re-Os同位素测试,获得等时线年龄为119.4±1.3Ma (MSWD =0.63,n=4).此年龄代表了波龙矿床的成矿年龄,与多不杂斑岩型铜金矿床的成矿年龄一致.波龙和多不杂斑岩型铜金矿床紧邻,并具有一致的成矿年龄,可能表明两个矿床的成矿受控于相同的构造-岩浆-成矿事件;斑岩铜矿具有成群分布的特征,波龙和多不杂斑岩铜金矿床的发现也暗示多龙矿集区具有找到其他大型斑岩铜金矿的潜力.

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