| 姜盛洪.新城金矿稳定同位素地球化学特征及成矿物质的来源[J].地质与勘探,2015,51(1):68-78 |
| 新城金矿稳定同位素地球化学特征及成矿物质的来源 |
| Geochemical characteristics of stable isotopes and metallogenic material source in the Xincheng gold deposit |
| 投稿时间：2014-09-19 修订日期：2014-12-16 |
| DOI： |
| 中文关键词: 同位素 流体来源 物质来源 成矿作用 新城金矿 |
| 英文关键词: isotopes, ore-forming fluids, metal source, metallogenesis, Xincheng |
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| 摘要点击次数: 2856 |
| 全文下载次数: 1554 |
| 中文摘要: |
| 新城金矿是胶东金矿集区招远—莱州成矿带的一个“焦家式”蚀变型金矿床。本文通过C、O、H、S、Pb同位素分析，研究新城金矿成矿流体、物质来源和成矿作用。新城金矿矿石中δD值范围为-116‰～-91‰，δ18O水值范围为3. 82 ‰～7. 24 ‰，表明成矿流体早期来源于岩浆水，成矿晚期混入大气降水。矿石硫化物、郭家岭花岗闪长岩、玲珑花岗岩和胶东群δ34S平均值分为7. 9‰、6. 5‰、8. 5‰和6. 2‰，认为矿石硫具有对矿区地层及岩浆岩硫的继承性。硫化物矿石206Pb/204Pb＝17. 115～17. 414，207Pb/204Pb＝15. 460～15. 577，208Pb/204Pb＝37. 912～38. 196，显示铅具有壳幔混合来源的特征。碳、氢、氧、硫、铅同位素反映新城金矿成矿物质和流体主要来源于深部岩浆。 |
| 英文摘要: |
| The Xincheng gold deposit，located in the Zhaoyuan-Laizhou gold metallogenic belt，eastern Shandong Province, is one of the “Jiaojia”-type alteration gold deposits. This paper aims at revealing the sources of ore-forming fluids，metallogenic material, and metallogenesis by analysis of C，O，H，S and Pb isotopes. The δD values of the fluid inclusion in quartz vary from -116‰ to -91‰，and δOwater values are between 6. 86‰ and 11. 48‰，which suggest the ore-forming fluids were derived mainly from magmatic water in the early period，with addition of minor amounts of meteoric water in the later period. The δ34S average values of the pyrites in the ores，Guojialing granodiorite，Linglong granite and Jiaodong Group，are 7.9‰，6.5‰，8.5‰，and 6.2‰，respectively， indicating their contribution from strata and granitoids. The ratios 206Pb/204Pb，207Pb/204Pb，and 208Pb/204Pb range from 17.115 to 17.414，from 15.460 to 15.577 from 37.912 to 38.196，respectively，implying that the Pb isotope stemmed from crustal-mantle mixing. The C–H–O–S–Pb isotope values in the ores demonstrate that the ore-forming fluids and metallogenic material originated mainly from magma ate depth in the Earth. |
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