西藏工布江达地区亚贵拉铅锌钼矿床辉钼矿Re-Os测年及其地质意义
Re-Os dating of molybdenite from the Yaguila porphyry molybdenum deposit in Gongbo'gyamda area, Tibet, and its geological significance
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摘要: 为确定念青唐古拉成矿带斑岩型矿床的成矿时间,对亚贵拉铅锌钼多金属矿集区斑岩钼矿的5件辉钼矿样品进行了Re-Os同位素分析,所获辉钼矿模式年龄在(64.27±0.90)~(65.97±1.13)Ma范围内,等时线年龄为(65.0±1.9)Ma(MSWD=3.2)。亚贵拉辉钼矿属主碰撞期成矿,成矿与短期内大规模的岩浆活动有关,暗示念青唐古拉—冈底斯地区存在大规模的主碰撞期成矿作用。
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关键词:
- Re-Os同位素年龄 /
- 辉钼矿 /
- 斑岩钼矿 /
- 念青唐古拉 /
- 西藏
Abstract: Located in the Gongbo'gyamda County of Tibet, the Yaguila Pb-Zn, Mo deposit is a porphyry Mo skarn-hydrothermal vein type deposit occurring in the eastern part of the Gangdise belt. For the purpose of finding out the mineralization time of the porphyry type molybdenum deposit in the Nianqingtanggula mineralization belt, the authors selected five molybdenite samples from the Yaguila ore district to perform the Re-Os dating. The Re-Os dating yielded weighted average model ages of (64.27±0.9) to (65.97±1.13) Ma, varying in a narrow range, and an isochrone age of 65.0±1.9Ma(MSWD=3.2). It is proved that the porphyry type molybdenum deposit of the Yaguila ore district was formed during Early Eocene. The results indicate that there occurred large scale ore-forming processes during the main Indian-Asian collision period in the Gangdise belt.-
Keywords:
- Re-Os dating /
- molybdenite /
- porphyry molybdenum deposit /
- Nianqingtanggula /
- Tibet
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