| 冷水坑矿田层状铅锌银矿稳定同位素特征与矿床成因 |
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| 引用本文： | 黄水保,孟祥金,徐文艺,周显荣,吴美仁,曾祥辉.冷水坑矿田层状铅锌银矿稳定同位素特征与矿床成因[J].东华理工大学学报（自然科学版）,2012,35(2):101-110. |
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| 作者姓名： | 黄水保 孟祥金 徐文艺 周显荣 吴美仁 曾祥辉 |
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| 作者单位： | 1. 江西地质矿产勘查开发局,江西南昌,330002
2. 中国地质科学院矿产资源研究所,北京,100037 |
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| 基金项目： | 国家科技支撑重点项目(2009BAB43B03);国土资源部公益性行业科研专项经费(201011011) |
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| 摘 要： | 赋存于火山岩地层层间破碎带中的层状铅锌银矿是冷水坑矿田重要的矿化类型之一。层状矿体内碳酸盐岩与矿石中金属硫化物碳氧硫铅同位素测定表明,铁锰碳酸盐矿物的δ13CV-PDB变化范围在-4.8‰～-5.5‰之间,δ18OV-SMOW为12.6‰～14.1‰,白云质灰岩分别为-3.3‰～-5.9‰,9.8‰～17.2‰。金属硫化物δ34S值为-3.9‰～+5.6‰,多集中在-1‰～6‰之间,与矿田斑岩型矿床硫同位素组成一致。矿石铅同位素组成比较一致,其中206Pb/204Pb,207Pb/204Pb,208Pb/204Pb分别为17.786～17.809,15.572～15.605,38.281～38.386。层状矿体矿石铅同位素组成位于矿田铅同位素分布范围内且比斑岩型矿石铅分布集中。矿石硫、铅同位素组成表明层状矿床成矿物质来自矿田火山(岩浆)系统。含矿地层内的碳酸盐岩层为火山喷发间歇局限陆相湖正常沉积而成,铁锰碳酸盐为火山(岩浆)热液成因而非喷流沉积。冷水坑层状铅锌银矿为火山热液型矿床。
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| 关 键 词： | 层状矿体 铅锌银矿 稳定同位素 火山热液矿床 冷水坑 |
Characteristics of Stable Isotope of the Bedded Lead-Zinc-Silver Orebody in Lengshuikeng Orefield and Ore Genesis |
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| HUANG Shui-bao
,
MENG Xiang-jin
,
XU Wen-yi
,
ZHOU Xian-rong
,
WU Mei-ren
,
ZENG Xiang-hui.Characteristics of Stable Isotope of the Bedded Lead-Zinc-Silver Orebody in Lengshuikeng Orefield and Ore Genesis[J].Journal of East China Institute of Technology(Natural Science Edition),2012,35(2):101-110. |
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| Authors: | HUANG Shui-bao MENG Xiang-jin XU Wen-yi ZHOU Xian-rong WU Mei-ren ZENG Xiang-hui |
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| Institution: | 1(1.Jiangxi Bureau of Exploration and Development for Geology and Mineral Resources,Nanchang,JX 330002,China;2.Institute of Mineral Resources,CAGS,Beijing 100037,China) |
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| Abstract: | The layered Pb-Zn-Ag mineralization concealed in the volcanic strata containing ferrous manganese carbonate is one of important mineralization types in Lengshuikeng ore district.The S-and Pb-isotopic data for the metals and the C-and O-isotopic date for carbonate rocks from the bedded ore-bodies in Lengshuikeng orefield were given in this paper.The δ13CV-PDB and δ18OV-SMOW values of ferromanganese carbonate minerals range from-4.8‰ to-5.5‰ and +12.6‰ to +14.1‰,while dolomitic limestone from-3.3‰ to-5.9‰,+9.8‰ to+17.2‰,respectively.The δ34S values for the sulfides from the ore-bodies vary slightly,ranging from-3.9‰ to +5.6‰,in accord with those from the porphyry deposit.The 206Pb/204Pb,207Pb/204Pb and 208Pb/204Pb ratios for the metals from the bedded ore-bodies vary in the rangers of 17.786 to 17.809,15.572 to 15.605 and 38.281 to 38.386,respectively.The lead isotope composition for the metals is in the range of that for the ores and the rocks from the porphyry deposit.The sulfur and lead isotopic features of the ore minerals from the bedded ore-bodies suggest that ore-forming materials are mainly from the volcanic rock and the ore-bearing granite porphyry.The carbonate in the volcanic strata was deposited in a restricted continental lake as volcano erupt intermission,while the ferrous manganese carbonate in the layered ore-body formed as not exhalative genesis but volcano hydrothermal.The bedded ore deposit in Lengshuikeng ore district is classified as a typical volcanic hydrothermal one. |
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| Keywords: | bedded ore-body lead-zinc-silver deposit stable isotope volcanic hydrothermal Lengshuikeng |
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