| 彭能立.内蒙古沙子沟钨钼多金属矿床辉钼矿Re-Os同位素定年及其地质意义[J].地质与勘探,2015,51(5):838-848 |
| 内蒙古沙子沟钨钼多金属矿床辉钼矿Re-Os同位素定年及其地质意义 |
| Re-Os isotopic dating of molybdenites from the Shazigou W-Mo multi-metal deposit, Inner Mongolia and its geological implications |
| 投稿时间：2014-03-18 修订日期：2014-03-16 |
| DOI： |
| 中文关键词: Re-Os同位素年龄 沙子沟钨钼多金属矿床 早三叠纪 西拉沐沦钼矿带 内蒙古 |
| 英文关键词: Re-Os isotopic dating, Shazigou W-Mo multi-metal deposit, Early Triassic, Xilamulun Mo-metallogenic belt, Inner Mongolia |
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| 中文摘要: |
| 内蒙古沙子沟钨钼多金属矿床位于华北克拉通北缘西拉沐沦钼多金属成矿带的西南部。辉钼矿体呈脉状产在围岩裂隙中，为石英-辉钼矿-黄铁矿组合，为了查明矿床的形成时间，本文采集了5件辉钼矿样品进行Re-Os同位素测试，获得模式年龄为(241.2±3.4)~(245.2±4.3)Ma，加权平均值为(243.8 ±1.6)Ma，表明沙子沟钨钼多金属矿床形成于早三叠纪。辉钼矿的铼含量介于1.231~1.704μg/g，表明钼主要来源于上地壳。结合区域研究成果，认为沙子沟钨钼多金属矿床形成于古亚洲洋关闭后华北板块与西伯利亚板块挤压、碰撞背景下。沙子沟钨钼多金属矿床成矿地质事件的厘定，为华北克拉通北缘印支期早三叠纪构造-岩浆-成矿作用提供了新的证据，有助于扩大区域找矿范围。 |
| 英文摘要: |
| The Shazigou W-Mo multi-metal deposit of Inner Mongolia is located in the southwest of the Xilamulun molybdenum metallogenic belt in the northern margin of the North China Craton. The molybdenite occurs as quartz-molybdenite-pyrite assemblages are usually of vein-like, existing in the wallrock fractures. In order to determine the metallogenic age, of this W-Mo multi-metal deposit, we have made measurements to Re-Os isotope on 5 molybdnite samples collected from the deposit, yielding the model ages between （241.2±3.4）Ma and （245.2±4.3）Ma, with an average value of 243.8 ±1.6 Ma. It indicates that the mineralization in the Shazigou W-Mo multi-metal deposit occurred in early Triassic time. The Re contents of molybdenites in Shazigou vary from 1.231μg/g to 1.704μg/g, which can be used as an important indicator on the source of ore-forming material. It is likely that the Mo ore-forming material in the Shazigou multi-metal W-Mo deposit was derived from the upper crust. Comparing with other Mo or Mo-bearing deposits in the regional molybdenum metallogenic belt, it is inferred that the formation of the Shazigou multi-metal W-Mo deposit was associated with the collision of the North China and Siberria plates after the closure of the Paleo-Asian ocean. The ore-forming age of this deposit provides new evidence for the tectonic magmatic mineralization in the northern margin of the North China Plate in Indosinian period of early Triassic, which would help expand the scope of regional prospecting. |
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