| 中国金矿床成矿时代的讨论 |
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| 引用本文：李俊建.1998.中国金矿床成矿时代的讨论[J].地球学报,19(1):215-220. |
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| 中文摘要:本文基于中国５０个岩金矿床８４组直接测年数据，提出中国金矿床具“一老（２５００￣１８００Ｍａ）一新（２８０￣１００Ｍａ）”的成矿格架。区域分布上，前寒武纪形成的金矿床在矿年代为“西新东老”，而显生宙金矿为“西老东新”。中国金矿床最重要的类型为绿岩还型金矿。测年方法上，应采用单颗粒含铀矿物Ｕ－Ｐｂ法，而＾４０Ａｒ／＾３９Ａｒ、Ｋ－Ａｒ法和Ｒｂ－Ｓｉ等时线法仅适于测定显生宙形成的金矿床。 |
| 中文关键词:成矿时代 金矿床 中国 |
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| Metallogenic Epoch of China's Gold Deposits |
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| Abstract:Based on the age_dating values from eighty_four pieces of rock samples in fifty China's gold deposits,the metallogenic epoch of China's gold deposits constitutes the metallogenic framework,include one older epoch(2500～1800Ma)and one younger epoch (280～100Ma).The regional destribution of metallogenic epoch shows regular variation,the epoch of Precambrian gold deposits gradually decreasesfrom west to east of China,while that of Phanerozoic gold deposits gradually increases.Gold deposits of greenstone belt type are the most important one in China.As to age_dating methods,the author recommends that single Uranium_bearing mineral U_Pb method is to be adopted ,for the precambrian gold deposits but for the Phanerozoic one the 40 Ar/ 39 Ar,K_Ar and Rb_Sr isochron methods are recomended. |
| keywords:metallogenetic epoch gold deposit China |
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