| 中国东部钼矿成矿背景与成岩-成矿时差讨论 |
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| 引用本文：杜保峰,魏俊浩,王启,李艳军,刘国春,于海涛,刘永利.2010.Discussion on metallogenic setting and time difference between magmatism and mineralization of molybdenum deposits in East China[J].Mineral Deposits,29(6):935~955 |
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| 基金项目:本文为教育部创新团队发展计划(IRT0755) 及中国地质大学地质过程与矿产资源国家重点实验室基金资助项目的成果 |
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| 中文摘要:中国东部中生代钼矿带属滨太平洋成矿域，钼矿床多沿不同构造单元的交界部位及区域性深大断裂呈带状分布，集中分布在东秦岭、燕辽、长江中下游、南岭和大兴安岭等钼矿成矿带。结合前人成果，以典型矿床为例，初步讨论了中国东部各个钼矿成矿带的成矿背景，成矿很可能与碰撞造山后的伸展背景和(或)太平洋板块俯冲有关。文章根据收集到的中国东部典型钼矿床的成矿年龄及相关岩体的同位素测年数据，详细讨论并定量厘定了钼矿床的成岩与成矿时差。结果表明，钼矿成矿同步或略滞后于同源岩浆活动，两个成矿高峰的时差分别为0～10.0 Ma和0～15.0 Ma；对于单个矿床，成岩_成矿时差集中在0～14.0 Ma，均值为4.1 Ma；从斑岩型→斑岩-矽卡岩型→矽卡岩型→石英脉型钼矿床，成岩-成矿时差呈递增趋势，这恰与岩浆热液成矿过程的客观地质事实相吻合。 |
| 中文关键词:地质学 钼矿 成矿背景 成岩-成矿时差 中国东部 |
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| Discussion on metallogenic setting and time difference between magmatism and mineralization of molybdenum deposits in East China |
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| Abstract:East China was intensely affected by the Marginal Pacific Metallogenic Domain in Mesozoic. Most molybdenum deposits along border areas of different tectonic units or regional deep faults are dominantly distributed in such metallogenic belts as East Qinling, Yanshan-Liaoning, Middle-Lower reaches of the Yangtze River, Nanling and Da Hinggan Mountains. Combined with previous studies, this paper discusses metallogenic settings of these regions exemplified by typical ore deposits, and draws the conclusion that Mo mineralization in these metallogenic belts probably resulted from the extensional setting of post-collision and/or subduction of the Pacific Plate. According to isotopic data of mineralization and ore-related rocks collected from some typical Mo deposits in East China, the authors investigated in detail and quantitatively determined the characteristics of time difference between magmatism and mineralization for Mo deposits. Mo mineralization in East China occurred contemporaneously with or immediately after ore-related granitoids. Time differences of the two peaking stages of Mo mineralization are within 0～10.0 Ma and 0～15.0 Ma respectively. For a single Mo deposit, the time differences are concentrated in 0～14.0 Ma with a mean of 4.1 Ma. In order of porphyry-type Mo deposits → porphyry-skarn complex Mo deposits → skarn-type Mo deposits → quartz vein-type Mo deposits, the time differences seem gradually increase, which is consistent with the observed geological facts of the magmatic hydrothermal ore-formational process. |
| keywords:geology, Mo deposits, metallogenic settings, time difference between magmatism and mineralization, East China |
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