|
|||||
|
|
| 青海玉树莫海拉亨铅锌矿床S、Pb、Sr-Nd同位素组成: 对成矿物质来源的指示——兼与东莫扎抓铅锌矿床的对比 | |
| 引用本文： | 田世洪,侯增谦,杨竹森,刘英超,宋玉财,王富春,鲁海峰.青海玉树莫海拉亨铅锌矿床S、Pb、Sr-Nd同位素组成: 对成矿物质来源的指示——兼与东莫扎抓铅锌矿床的对比[J].岩石学报,2011,27(9):2709-2720. |
| 作者姓名： | 田世洪 侯增谦 杨竹森 刘英超 宋玉财 王富春 鲁海峰 |
| 作者单位： | 1. 中国地质科学院矿产资源研究所,国土资源部成矿作用与资源评价重点实验室,北京100037 2. 中国地质科学院地质研究所,北京,100037 3. 青海省地质调查院,西宁,810012 |
| 基金项目： | 本文受国家973项目(2009CB421007、2009CB421008、2011CB403104)、"十一五"国家科技支撑计划重大项目(2006BAB01A08)、国土资源大调查项目(1212010818096)、国家自然科学联合基金(U09336051)和中央级公益性科研院所基本科研业务费专项资金(K0802)联合资助. |
| 摘 要： | 青海玉树地区莫海拉亨铅锌矿床和东莫扎抓铅锌矿床均位于青藏高原金沙江缝合带和班公湖-怒江缝合带夹持的羌塘地体东北缘,是"三江"北段铜铅锌多金属成矿带铅锌矿床的2个典型代表。笔者曾通过对东莫扎抓铅锌矿床的S-Pb-Sr-Nd同位素组成特征研究,认为其成矿物质来源于沉积地层。本文在野外地质观察基础上,亦对莫海拉亨铅锌矿床的矿石矿物和重晶石进行了S同位素组成分析,对矿石矿物、脉石矿物和区域地层进行了Pb同位素组成分析,对脉石矿物进行了Sr-Nd同位素组成分析。分析结果表明,硫化物δ34S值为-30.0‰~7.4‰,峰值为-18‰~-2‰,反映了总体富轻硫的特征,而重晶石δ34S值为20.2‰~+24.2‰,来自于第三纪陆相盆地。宽的δ34S变化可以解释为流体在盆地内活动期间与不同地层单元发生相互作用,从而继承了不同物质单元的S同位素特点,还原硫应主要来自于硫酸盐的细菌还原或者含硫有机质的热还原,反映硫来自沉积盆地。矿石矿物的206Pb/204Pb、207Pb/204Pb和208Pb/204Pb分别为18.298~18.694、15.298~15.721、38.169~38.894,而脉石矿物的206Pb/204Pb、207Pb/204Pb和208Pb/204Pb分别为18.418~18.672、15.418~15.719、38.403~38.845。矿石矿物和脉石矿物的Pb同位素组成介于区域上地壳Pb组成范围内,总体类似于MVT矿床,显示Pb等金属元素来源于上地壳岩石。脉石矿物的(87Sr/86Sr)i、εSr(t)、(143Nd/144Nd)i和εNd(t)分别为0.70851~0.70906、57.4~65.2、0.512265~0.512361、-6.5~-4.6。Sr-Nd同位素特征亦显示脉石矿物的物质来源于上地壳岩石。总体来说,莫海拉亨铅锌矿床的S-Pb-Sr-Nd同位素特征均与东莫扎抓铅锌矿床的一样,显示均来自沉积地层。并结合矿床地质特征和地球化学特征,讨论了莫海拉亨铅锌矿床和东莫扎抓铅锌矿床形成的动力学背景。 |
| 关 键 词： | 成矿物质来源 S同位素 Pb同位素 Sr-Nd同位素 莫海拉亨铅锌矿床 青海玉树 |
| 收稿时间： | 4/5/2011 12:00:00 AM |
| 修稿时间： | 7/8/2011 12:00:00 AM |
Sulfur, lead, strontium and neodymium isotope compositions of the Mohailaheng lead-zinc ore deposit in the Yushu area, southern Qinghai: Implications for the sources of ore-forming material in the deposit and comparison with those of Dongmozhazhua lead-zinc ore deposit |
|
| TIAN ShiHong,HOU ZengQian,YANG ZhuSen,LIU YingChao,SONG YuCai,WANG FuChun and LU HaiFeng.Sulfur, lead, strontium and neodymium isotope compositions of the Mohailaheng lead-zinc ore deposit in the Yushu area, southern Qinghai: Implications for the sources of ore-forming material in the deposit and comparison with those of Dongmozhazhua lead-zinc ore deposit[J].Acta Petrologica Sinica,2011,27(9):2709-2720. | |
| Authors: | TIAN ShiHong HOU ZengQian YANG ZhuSen LIU YingChao SONG YuCai WANG FuChun and LU HaiFeng |
| Institution: | MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Qinghai Institute of geological Survey, Xining 810012, China;Qinghai Institute of geological Survey, Xining 810012, China |
| Abstract: | The Mohailaheng and Dongmozhazhua Pb-Zn deposits in the Yushu area of Qinghai Province,located in the northeast margin of Qiangtang terrane which is between Jinshajiang suture zone and Bangonghu-Nujiang suture zone,are the two typical Pb-Zn deposits in the Cu-Pb-Zn polymetallic mineralization belt for the northern part of the Nujiang-Lancangjiang-Jinshajiang area.The authors thought the sources of ore-froming material were derived from the sedimentary strata by the research of sulfur,lead,strontium and neod... |
| Keywords: | Source of ore-forming material S isotope Pb isotope Sr-Nd isotope Mohailaheng Pb-Zn deposit Yushu area Qinghai Province |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |
| 点击此处可从《岩石学报》浏览原始摘要信息 | |
| 点击此处可从《岩石学报》下载免费的PDF全文 | |