| 辽宁红透山块状硫化物矿床矿石糜棱岩铜-金富集机制 |
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| 引用本文： | 顾连兴,汤晓茜,吴昌志,陆建军,肖新建,郑远川,倪培,田泽满.辽宁红透山块状硫化物矿床矿石糜棱岩铜-金富集机制[J].地学前缘,2004,11(2):339-351. |
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| 作者姓名： | 顾连兴 汤晓茜 吴昌志 陆建军 肖新建 郑远川 倪培 田泽满 |
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| 作者单位： | 1. 南京大学地球科学系内生金属矿床研究国家重点实验室,江苏,南京,210093
2. 红透山铜矿有限公司,辽宁,抚顺,113321 |
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| 基金项目： | 国家自然科学基金资助项目 ( 4 0 172 0 3 4) |
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| 摘 要： | 辽宁红透山太古宙块状硫化物型铜锌矿床成矿后的变质作用达到高角闪岩相 ,并经历了 3个阶段的变形。矿床的主要矿石矿物为黄铁矿、磁黄铁矿、黄铜矿和闪锌矿。主矿体内分布有 30多条矿石糜棱岩带 ,它们大多数平行或近于平行块状硫化物矿层 ,少数产在矿体附近围岩中。带中的各种硫化物矿物均遭受了强烈的剪切变形 ,其中黄铁矿以碎裂为主 ,而磁黄铁矿、黄铜矿和闪锌矿显示强烈的塑性。矿石糜棱岩比块状硫化物矿石明显富集铜、金、银等元素 ,其铜、金和银平均含量分别达1 1 .0 0 % ,1 .74g/t和 2 35g/t,相对于块状矿石的富集系数分别为 5 .3、5 .0和 4 .6。这些金属的高度富集主要是因为矿石糜棱岩受到了后期流体的叠加。铅同位素组成表明矿石糜棱岩中的金属一部分来自块状矿石 ,另一部分来自块状硫化物矿体之外。韧性剪切和流体叠加均发生于矿床退变质过程中
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| 关 键 词： | 块状硫化物矿床 矿石糜棱岩 韧性剪切带 再活化 铅同位素 红透山 辽宁 |
| 文章编号： | 1005-2321(2004)02-0339-13 |
| 修稿时间： | 2004年3月2日 |
MECHANISMS OF Cu-Au ENRICHMENT IN ORE MYLONITES OF THE HONGTOUSHAN MASSIVE SULPHIDE DEPOSIT, LIAONING, NE CHINA |
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| GU Lian-xing,TANG Xiao-qian,WU Chang-zhi,LU Jian-jun,XIAO Xin-jian,ZHENG Yuan-chuan,NI Pei,TIAN Ze-man.MECHANISMS OF Cu-Au ENRICHMENT IN ORE MYLONITES OF THE HONGTOUSHAN MASSIVE SULPHIDE DEPOSIT, LIAONING, NE CHINA[J].Earth Science Frontiers,2004,11(2):339-351. |
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| Authors: | GU Lian-xing TANG Xiao-qian WU Chang-zhi LU Jian-jun XIAO Xin-jian ZHENG Yuan-chuan NI Pei TIAN Ze-man |
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| Institution: | GU Lian-xing~1,TANG Xiao-qian~1,WU Chang-zhi~1,LU Jian-jun~1,XIAO Xin-jian~1,ZHENG Yuan-chuan~1,NI Pei~1,TIAN Ze-man~2 |
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| Abstract: | The post metallogenic metamorphism of Hongtoushan Archean Cu-Zn massive sulphide deposit, Liaoning Province of NE China, belongs to upper amphibolite facies with three phases of deformations. Ore minerals in the deposit are dominated by pyrite, pyrrhotite, chalcopyrite and sphalerite. There are more than 30 mylonite-type oreshoots found inside the main massive sulphide orebodies. Most of them run parallel or sub-parallel to the strike of the massive sulphide ore layers with only a few being developed in metamorphic rocks in the immediate vicinity of the sulphide orebodies. Almost all the sulphide minerals in the oreshoots have been affected by intense ductile shearing. Pyrite is characterized by cataclastic flow, while pyrrhotite, chalcopyrite and sphalerite exhibit strong plasticity. Cu, Au and Ag in ore mylonite are averaged in 11.00 wt%, 1.74 g/t and 235.2 g/t respectively. Compared to the massive sulphide ores, ore mylonites show remarkable enrichment of these elements with enrichment coefficients of 5.3, 5.0 and 4.6 respectively. The high enrichment of these ore-forming metals is basically due to the overprinting of late-stage fluids on ore mylonites. The composition of lead isotopes suggests that the metals in the ore mylonites were derived partly from the original massive ores, and partly from outside the massive ores. Both ductile shearing and fluid overprinting took place during retrograde metamorphism. |
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| Keywords: | massive sulphide deposit ore mylonite ductile shear zone remobilization lead isotopes Hongtoushan Liaoning Province |
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