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| 甘肃岷县马坞金矿同位素特征与成因探讨 | |
| 引用本文： | 赵玉锁,肖力,杨鹏飞,崔龙,赵常存.甘肃岷县马坞金矿同位素特征与成因探讨[J].西北地质,2009,42(4):30-36. |
| 作者姓名： | 赵玉锁 肖力 杨鹏飞 崔龙 赵常存 |
| 作者单位： | 1. 武警黄金地质研究所,河北,廊房,065000;中国地质大学(北京)地球科学与资源学院,北京,100083 2. 武警黄金地质研究所,河北,廊房,065000 3. 西安地质矿产研究所,陕西,西安,710054 4. 武警黄金第五支队,陕西,西安,710062 |
| 基金项目： | 中国地质调查局国土资源大调查项目 |
| 摘 要： | 马坞金矿位于岷县东部,属岷-礼成矿带的中段,为一中型金矿。赋矿地层及成矿地质背景与中川地区的其他金矿床具有相似性。主成矿期石英的氢氧同位素测试结果表明：δD为-78‰～-98‰,δ^18OSMOW（矿物？）为18.0‰～20.2‰,δ18O水为0.45‰～8.54‰,显示成矿流体为岩浆水、变质水和大气降水的混合水,其中以岩浆水和变质水为主;主成矿期黄铁矿同位素的测定结果显示：δ34S为＋7.1‰～＋7.9‰,平均＋7.65‰。可见其变化范围较小,均一性强,具有地层硫特征。结合区内已有同位素资料及区域成岩成矿背景,推断马坞金矿的成矿作用与区内中川岩体关系密切,其中成矿流体主要来源于岩浆与地层,混入少量大气降水;成矿物源主要来自地层,另有深部物源参与成矿。 |
| 关 键 词： | 马坞金矿 岷县 同位素 成矿流体 |
Isotopic Characteristics and Causes of Formation of Mawu Gold Deposits in Minxian County, Gansu |
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| ZHAO Yu-suo,XiAO Li,YANG Peng-fei,CUI Long,ZHAO Chang-cun.Isotopic Characteristics and Causes of Formation of Mawu Gold Deposits in Minxian County, Gansu[J].Northwestern Geology,2009,42(4):30-36. | |
| Authors: | ZHAO Yu-suo XiAO Li YANG Peng-fei CUI Long ZHAO Chang-cun |
| Institution: | ZHAO Yu-suo, XiAO Li, YANG Peng-fei, CUI Long, ZHAO Chang-cun (1. Gold Geological Institute of the Chinese People＇s Armed Police Force , Langfang Hebei 065000, China ; 2. China University of Geosciences, Beijing 100083, China ; 3. Xi＇an Institute of Geology and Mineral Resources, Xi＇an, Shaanxi 710054, China; 4. No. 5 Gold Geological Party of CAPF Xi＇an, Shaanxi 710062, China) |
| Abstract: | Mawu deposit is a medium-scale gold deposit,located in the east part of Minxian and the middle of metallogenic belt Min-Li.Ore formation,source of ore-forming materials and metallogenic geological background of Mawu are similar to the gold deposits of the Zhongchuan area.The test results of quartz reef of the main ore-forming stage of Mawu show that the hydrogen and oxygen isotopes are： δD is-78～-98‰,δ^18OSMOW is 18.0～20.2‰,δ^18Owater is 0.45～8.54‰,and the ore-forming fluids are the magmatic water, metamorphic water and atmospheric precipitation in a mixture of water, of which the magmatic water and metamorphic water are the main water. In quartz reef of the main ore-forming stage, δ34S is ＋7. 1～＋7. 9‰, the average is ＋7. 65‰, and the δ^34S shows smaller changes in the scope, showing the characteristics of formation of stratum sulfur. Isotopic data, regional geological background and diagenetic mineralization characteristics have been combined with the region, showing that the mineralization of fluids relative well to magma function and inrush of Zhongchuan rock-Body, the main oreforming fluids from the magma and the formation, and have varying degrees of mixing with meteoric water. The main sources of ore-forming materials are from the strata and deep sources. |
| Keywords: | Mawu deposit Mimxian isotope ore-forming fluids |
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