西秦岭南亚带层控金-硒矿床的赋矿地层年代与成矿时代
Reidentifcation of the ore-hosted strata age and metallogenic age of the stratabound Au-Se deposits,the western qinling mountains
查看参考文献31篇
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文摘
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西秦岭南亚带层控金-硒矿床的赋矿地层为太阳顶群，为一套主要由岩和炭质板岩组成的硅岩建造。对于太阳顶群的时代，至今仍众说纷纭，莫衷一是，大多数人认为属晚寒武世-奥陶纪，也有认为属晚震旦-早寒武世。作者通过对古杯类化石和鉴定以及Rb-Sr、Sm-Nd同位素等时线年龄测定后认为，赋矿的太阳顶群时代应属早寒武世，而非晚寒琥世-奥陶纪，更不可能为晚震旦世。对金-硒矿床中2个民矿阶段石英样吕进行~(40)Ar/~(39)Ar快中子活化测定后获得马鞍型谱线特征。基中坪年龄(71.45±0.55)-(80.05±0.65)Ma、最小视年龄(70.24±1.93)-(78.59±2.85)Ma和等时线年龄(69.45±0.38)-(81.61±0.55)Ma均十分接近，说明所测2件石英样品的~(40)Ar/~(39)Ar年龄真实可靠，表明太阳顶群中层控金-硒矿床的成矿时间主要发生于燕山运动晚期。 |
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其他语种文摘
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The stratabound gold and selenium deposits in the south subzone of the western Qinling Mountains include the Laerma (Edu) and the Qiongmo gold and selenium deposits and the Yaxiang gold and selenium ore occurrence. They constitute a new type of gold deposits discovered in China, which possess unique geological characteristics. They are hosted in Taiyangding Group, which is composed of a series of carbonaceous cherts and slates. However, the ore-hosted strata age has been confused because of lacking fossil and dependable data of isotopic age, which is identified by comparison between structure and lithology. The recently tendentious idea about the ore-hosted strata age is the Late Cambrian-Or-dovician or the Late Sinian-the Early Cambrian. However, identification of the Archaeocyathus in chert in the lower Taiyangding Group shows that the fossil age ranges from the Early to Middle Cambrian. Combining with Rb-Sr and Sm-Nd isochron ages, the authors conclude that the ore-hosted strata age is the Early Cambrian. Two quartz samples collected from the Qiongmo Au-Se deposit in the western Qinling Mountains were measured by ~(40)Ar/~(39)Ar fast neutron activation techniques, and the spectra are characterized as being saddle-shaped. The sample measurements show a plateau age of (71. 45 + 0. 55) ~ (80. 05 + 0. 65) Ma, a minimum apparent age of (70. 24 + 1. 93)~(78. 59±2. 85) Ma and an isochron age of (69. 45 + 0. 38)~(81. 61 +0. 55) Ma, and the three ages being close to each other, indicating that the ages of the quartz samples so far measured are reliable. The authors suggest that the time of formation of Au-Se ores corresponds to the Late Yanshan period. |
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来源
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地学前缘
,2004,11(2):435-443 【核心库】
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关键词
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层控金-硒矿床
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地址
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1.
中国地质大学（北京）, 岩石圈构造、深部过程及探测技术教育重点实验室, 北京, 100083
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中国科学院地球化学研究所, 矿床地球化学重点实验室, 贵州, 贵阳, 550002
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中国科学院地质与地球物理研究所, 矿产资源研究重点实验室, 北京, 100029
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成都理工大学地球科学学院, 四川, 成都, 610059
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1005-2321 |
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学科
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地质学 |
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基金
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国家自然科学基金
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国家自然科学基金
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国家自然科学基金
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南京大学内生金属矿床成矿机制研究国家重点实验室基金
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文献收藏号
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CSCD:1631844
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