| 徐步台.浙江绍兴——龙泉成矿带金矿床稳定同位素地球化学特征[J].地质找矿论丛,1988,(4):53-61 |
| 浙江绍兴——龙泉成矿带金矿床稳定同位素地球化学特征 |
| STABLE ISOTOPIC GEOCHEMISTRY OF GOLD DEPOSITS IN THE SHAOXING-LONGQUAN OREFORMING ZONE,ZHEJIANG PROVINCE |
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| DOI：10.6053/j.issn.1001-1412.1988.4. 005 |
| 中文关键词: 成矿带 含金建造 变质同生水 古大气降水 火山岩浆水 |
| 英文关键词: |
| 基金项目: |
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| 摘要点击次数: 1064 |
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| 中文摘要: |
| 据浙江绍兴—龙泉成矿带主要金矿床中的41个铅同位素数据和28个氧、氢同位素数据资料,进行综合分析研究、着重探讨了金矿的物质来源和成矿流体的性质。 |
| 英文摘要: |
| The Shaoxing-Longquan oreforming zone of Zhe Jiang Province is one of the noble metal metallogenic belts in southeastern China. In this belt, there are three types of gold depositts: (1)Zhilingtou (major ore-veins in early period) and Luoshan deposits related to the meta-sedimentary rocks of Chencai Group; (2) Zhongao and Huangshan deposits related to the meta-volcanic rocks of Shuangxiwu Group and itscomagmatic or palingenetic magmatic rocks (also metamorphosed); (3)Babaoshan and Zhilingtou (minor ore-veins in late perjod) deposits related to the Mesozoic volcanic rocks. Most of the calculated lead isotopic model-ages for the gold deposits (1) and (2) range from500--750Ma close to the metamorphic age of the country rocks. Whereas, the model-ages ranging from 100--250Ma for the gold deposit (3) ate consistent with or olose to the forming age of the country rocks. In addition, most of the μ uvalues are relatively higher (≥9.5) and K(232Th/238U)values more than 4 in the gold (1), it is suggested that this lead mainly comes from the upper crust.In other deposits, most of the μ uvalues are lower (<9.5) and K values less than 4, it foilows that this lead maintl comes from the lower crust or the upper mantle. The gold deposits (1) and (2) have a relatively narrow range of δD values (-53～-62%),and positive δ18O values (+1.0～+4.7‰), that indicates ore forming fluids mainly originated from the syngenetic metawater. However, the gold deposit (3) has a wider range of δD values (-58～-73‰), and negative δ18O values (-2.1～-4.9‰) similar to those of Mesozoic meteoric water in southeastern China. There fore, this oreforming fluid mainly originated from the meteoric water. |
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