| 长江中下游成矿带铜多金属矿床中灰泥丘的发现及其意义——以武山和冬瓜山铜矿为例 |
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| 引用本文： | 蒋少涌,丁清峰,杨水源,朱志勇,孙明志,孙岩,边立曾.长江中下游成矿带铜多金属矿床中灰泥丘的发现及其意义——以武山和冬瓜山铜矿为例[J].地质学报,2011,85(5):744-756. |
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| 作者姓名： | 蒋少涌 丁清峰 杨水源 朱志勇 孙明志 孙岩 边立曾 |
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| 作者单位： | 南京大学地球科学系内生金属矿床成矿机制研究国家重点实验室 |
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| 摘 要： | 通过对长江中下游成矿带中武山铜矿和冬瓜山铜矿层状矿体的详细研究，发现了大量具有层圈状构造、层纹状构造或不规则同心环状构造的矿石。在前人研究基础上，经光薄片鉴定、扫描电镜观察和碳氧同位素分析等，认为这类矿石在宏观构造上显示出类似于灰泥丘的孔洞系统，微观上又发现了细菌等微生物结构，判断其属于一种矿化的灰泥丘。资料显示，灰泥丘和热水喷流沉积成矿作用关系密切，灰泥丘可视为热水喷流沉积成矿的证据之一。本文所研究的两个矿床中灰泥丘构造矿石保存状况略有不同，冬瓜山铜矿灰泥丘构造矿石保留了大量显示原生热水喷流沉积成因的组构、并发现细菌等微生物结构，碳氧同位素组成也显示原始沉积特征；而武山铜矿灰泥丘构造矿石则显示出强烈受热液改造的矿石组构和碳氧同位素组成特征，暂未发现细菌等微生物结构。冬瓜山和武山铜矿灰泥丘构造矿石的发现，有力地佐证了长江中下游成矿带在海西期曾发生过热水喷流沉积成矿作用。
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| 关 键 词： | 长江中下游 武山铜矿 冬瓜山铜矿 灰泥丘 热水喷流沉积成矿 |
| 收稿时间： | 3/9/2011 9:49:58 PM |
| 修稿时间： | 4/11/2011 4:53:46 PM |
Discovery and significance of carbonate mud mounds from Cu-polymetallic deposits in the Middle and Lower Yangtze River mineralization belt: Examples from the Wushan and Dongguashan deposits |
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| Jiang ShaoYong and DING Qingfeng,YANG Shuiyuan,ZHU Ziyong,SUN Mingzhi,SUN Yan,BIAN Lizeng.Discovery and significance of carbonate mud mounds from Cu-polymetallic deposits in the Middle and Lower Yangtze River mineralization belt: Examples from the Wushan and Dongguashan deposits[J].Acta Geologica Sinica,2011,85(5):744-756. |
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| Authors: | Jiang ShaoYong and DING Qingfeng YANG Shuiyuan ZHU Ziyong SUN Mingzhi SUN Yan BIAN Lizeng |
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| Institution: | State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University |
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| Abstract: | Bedded sulfide orebodies occur in the Wushan and Dongguashan Cu deposits in the Middle and Lower Yangtze River mineralization belt. In this study, we found many typical circular or laminated textures in the bedded sulfide ores. Based on microscopic observation of thin sections of the ore samples, carbon and oxygen isotopic analysis, and scanning electron microscope (SEM) observation, we suggested that this type of sulfide ores belongs to a mineralized kind of carbonate mud mound. The macroscopic structures of these sulfide ores are quite similar to those of cavities system of typical carbonate mud mounds, and there are also bacteria structures found in some of the ore samples with SEM analysis. The conservation conditions of the carbonate mud mounds in the two copper deposits are different, in the Dongguashan Cu deposit, a lot of primary exhalative sedimentary textures are preserved, bacteria structures are found, and the carbon-oxygen isotopic compositions show primary sedimentary characteristics, while those in the Wushan Cu deposit show hydrothermal altered/overprinted textures, and no bacteria structures have been found so far, the carbon-oxgen isotopic compositions also indicate a hydrothermal reworking. In summary, the discoveries of carbonate mud mounds structure sulfide ores in the Wushan and Dongguashan Cu deposits provide new evidence for the Hercynian sedimentary exhalative mineralization in the Middle and Lower Yangtze River mineralization belt. |
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| Keywords: | Middle and Lower Yangtze River mineralization belt Wushan Cu deposit Dongguashan Cu deposit Carbonate mud mounds Sedimentary-hydrothermal exhalative |
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