投稿时间：2022-01-29
修订日期：2022-06-23
网络发布日期：2022-09-09
中文摘要:川滇黔铅锌多金属成矿域内，碳酸盐岩容矿的热液铅锌矿床多达400个。松梁铅锌矿床地处滇东北与川东南的交接处，位于川滇黔铅锌多金属成矿域的核心部位；铅锌矿体赋存于震旦系灯影组白云岩内，矿体产出明显受断裂控制；矿石矿物组成简单，主要由闪锌矿、方铅矿和黄铁矿组成。文章重点研究了松梁铅锌矿床硫化物的S、Pb、Zn同位素组成，进而探讨了其成矿物质来源及矿床成因。研究表明，松梁铅锌矿床的硫化物δ34SCDT值在+4.6‰~+13.7‰之间，平均值为+10.5‰，显示硫来源于赋矿围岩，为震旦系灯影组硫酸盐经TSR的产物；硫化物的Pb同位素比值为206Pb/204Pb=18.158~18.513、207Pb/204Pb=15.633~15.895、208Pb/204Pb=38.096~38.786，反映成矿物质为壳源铅，源自震旦系灯影组白云岩与结晶基底的混合；闪锌矿的δ66Zn为-0.126‰~+0.082‰，揭示成矿物质可能源自震旦系灯影组碳酸盐岩和结晶基底的混合。松梁铅锌矿床为后生碳酸盐岩容矿型铅锌矿床。
Abstract:There are as many as 400 hydrothermal Pb-Zn deposits hosted by carbonate rocks in Sichuan-Yunnan-Guizhou Pb-Zn polymetallic metallogenic province. The Songliang Pb-Zn deposit is located at the intersection of northeast Yunnan and southeast Sichuan, where is the core of SYG Pb-Zn polymetallic metallogenic province. The Pb-Zn ore bodies of the Songliang deposit occur in the dolomite of the Sinian Dengying Formation, and its occurrence is controlled by faults obviously. Sulfide minerals are mainly composed of sphalerite, galena and pyrite with simple composition. This paper focused on the composition of S, Pb and Zn isotopes, and then discussed the source of ore-forming materials and the genesis of the Songliang deposit. The analytical results show that the δ34SCDT values of sulfides from the Songliang deposit ranged from +4.6‰ to +13.7‰, with an average of +10.5‰, indicating that the sulfur was derived from host rocks and was the product of TSR of sulphates in the Sinian Dengying Formation. The Pb isotope ratios of sulfide samples were relatively uniform and 206Pb/204Pb=18.158~18.513, 207Pb/204Pb=15.633~15.895, 208Pb/204Pb=38.096~38.786, reflecting a crustal source which is the mixture of dolomite in the Sinian Dengying Formation and crystalline basement. The δ66Zn of sphalerite is in the range of -0.126 ‰ to +0.082 ‰, which indicates that the ore-forming materials are derived from the mixture of the Sinian Dengying Formation carbonate rocks and basement rocks in the Kunyang and Huili Group. The Songliang Pb-Zn deposit was an epigenetic Pb-Zn deposit hosted by carbonate rocks.
keywords:geochemistry sulfur-lead-zinc isotopes source of ore-forming materials genesis of deposit Songliang Pb-Zn deposit northeastern Yunnan Province
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基金项目:本文得到云南省万人计划青年拔尖人才项目(编号:YNWR-QNBJ-2018-093)、国家自然科学基金项目(编号:41862007)和昆明理工大学重点学科建设项目(编号:14078384)联合资助
引用文本：
伊丽娜,李波,王新富,韩润生,唐果,张羽洋.2022.滇东北松梁铅锌矿床成矿物质来源：来自S、Pb、Zn同位素的证据[J].矿床地质,41(4):770~788YI LiNa,LI Bo,WANG XinFu,HAN RunSheng,TANG Guo,and ZHANG YuYang.2022.Sources of metallogenic materials of Songliang lead-zinc deposit in northeastern Yunnan, China: Evidence from S, Pb and Zn isotopes[J].Mineral Deposits41(4):770~788
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