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小秦岭金(钼)矿床辉钼矿铼-锇定年及其地质意义
  • 期刊名称:李厚民, 叶会寿, 毛景文, 王登红, 陈毓川, 屈文俊, 杜安道, 小秦岭金(钼)矿床辉钼矿铼-锇
  • 时间:0
  • 分类:P618.65[天文地球—矿床学;天文地球—地质学]
  • 作者机构:[1]中国地质科学院矿产资源研究所,北京100037, [2]中国地质科学院成矿作用与资源评价重点实验室,北京100037, [3]中国地质科学院,北京100037, [4]国家地质实验测试中心,北京100037
  • 相关基金:本文得到中国地质调查局《我国西部重要成矿区带矿产资源潜力评估》(1212010535804)、《中国成矿体系综合研究》(1212010634002)、《我国重要矿产和区域成矿规律研究》(1212010633903)和自然科学重点基金《华北及邻区晚中生代大规模成矿与岩石圈伸展耦合关系》(40434011)的资助
  • 相关项目:华北及邻区晚中生代大规模成矿与岩石圈伸展耦合关系
中文摘要:

最近在河南灵宝小秦岭地区大湖金矿及其附近的泉家峪含金石英脉中发现了具有工业价值的钼矿化。为了研究小秦岭金矿集中区钼矿的成矿时代,笔者选取大湖金(钼)矿床及泉家峪石英脉型金钼矿体中的辉钼矿进行了Re-Os法同位素定年,在大湖钼金矿石中获得3个辉钼矿样品的Re-Os模式年龄,分别为(223.0±2.8)Ma、(223.7±2.6)Ma和(232.9±2.7)Ma;泉家峪钼金矿石中2个辉钼矿样品的Re-Os模式年龄分别为(129.1±1.6)Ma和(130.8±1.5)Ma。这些年龄数据表明,该区的成矿作用不仅发生于燕山期,而且还发生在印支期。与金堆城、黄龙铺等典型钼矿床不同,大湖和泉家峪矿床中辉钼矿含铼很低,可能表明它们的成矿物质来自壳源。

英文摘要:

Molybdenum mineralization with economic value was recently discovered in the Dahu gold deposit and its nearby Quanjiayu gold-bearing quartz veins in the Xiaoqinling gold ore district, Henan Province. For the purpose of studying the chronology of the molybdenum mineralization in this district, the authors purified molybdenite from the Dahu gold deposit and the Quanjiayu gold-bearing quartz veins. Re-Os dating of these molybdenite minerals yielded modal ages of (223.0 ±2.8)Ma, (223.7 ± 2.6)Ma and (232.9 ± 2.7)Ma for the three samples from Dahu and (129.1 ± 1.6)Ma and (130.8 ± 1.5)Ma for the two samples from Quanjiayu. These results indicate that Au-Mo mineralization in the Xiaoqinling gold ore district took place not only at the Yanshanian stage but also at the Indo-Chinese stage. Different from things of Jinduicheng, Huanglongpu and other Mo deposits, the molybdenites from the Dahu and Quanjiayu deposits have a very low content of Re, showing a crustal source for ore-forming materials.

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