| 周 雄.西藏邦铺钼铜多金属矿床硫、铅同位素
地球化学特征[J].地质与勘探,2012,48(1):24-30 |
| 西藏邦铺钼铜多金属矿床硫、铅同位素
地球化学特征 |
| Geochemical Characteristics of Sulfur and Lead Isotopes from the BangpuMo-Cu Polymetallic Deposit,Tibet |
| 投稿时间：2011-06-27 修订日期：2011-10-06 |
| DOI： |
| 中文关键词: 硫铅同位素 地球化学特征 钼铜多金属矿床 西藏邦铺 |
| 英文关键词: sulfur-lead isotope,geochemical characteristics,Mo-Cu polymetallic deposit,Bangpu in Tibet |
| 基金项目:“十一五冶国家科技支撑计划项目(2006BAB01A04)、成都理工大学矿物学、岩石学、矿床学国家重点(培育)学科建设项目
(SZD0407)联合资助 |
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| 中文摘要: |
| [摘 要]西藏邦铺钼铜多金属矿床位于西藏冈底斯斑岩铜矿带东段,是典型的大型斑岩型矿床,以钼、铜为主,共生铅、锌。本文通过硫、铅同位素研究,获得含矿岩浆岩的硫同位素δ34S( -0.48‰～12.2‰,平均3.80‰)与硫化物矿物的硫同位素δ34S( -1.5‰～ +4.3‰,平均0.98‰) 组成一致,具有典型的岩浆硫特点(δ34S=0译);含矿岩浆岩铅同位素206Pb/204Pb、207Pb/204Pb208Pb/204Pb 比值分别变化于38.857～39.857、15.620～15.704、18.684 ～ 18.768 之间,方铅矿铅同位素组成206Pb/204Pb、207Pb/204Pb、208Pb/204Pb 比值分别变化于18.752～18.825、15.712 ～ 15.718、39.348～39.463 之间,显示其具有正常铅同位素的特点,可能同源,具有相同的演化历史或起源;特征值及铅同位素图解显示其具有壳幔混合特征,以壳源为主,可能主要来源于参加造山带的上部地壳。 |
| 英文摘要: |
| Abstract:The Bangpu molybdenum-copper deposit in Tibet,which is located in the eastern part of the Gangdese porphyry copper belt,is a largescale
porphyry deposit,dominated by Mo and Cu with associated Pb-Zn. Sulfur and lead isotopic studies show that δ34S from ore-bearing magmatic rocks(0. 48‰～12. 2‰,averaged 3. 80‰) are in accordance with that of sulfide minerals (-1. 5‰～+4. 3‰,averaged 0. 98‰),sharing typical magmatic
sulfur characteristics (δ34S=0‰). Lead isotopes of 206 Pb/ 204 Pb,207 Pb/ 204 Pb and 208 Pb/ 204 Pb from ore-bearing magmatic rocks vary from 38. 857 ～39. 857,15. 620～15.704,and 18.684～18.768,respectively,while those from galena vary from 18.752～18.825,15.712～15.718 and 39.348～39. 463,which indicates its normal lead characteristics with the same homologous evolutionary history or the same source. The eigenvalue and lead isotopic diagram show that they are characterized by mixed crustal and mantle materials,dominated by crust origin,probably originated from the upper crust involving orogeny. |
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