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柴北缘滩间山金矿田细晶沟花岗斑岩锆石U-Pb年龄与Hf同位素特征及其与金矿化的关系
- 姜芷筠|赵呈祥|李碧乐|李鹏|李治华|李华伟|于润涛
- 作者单位：
- 吉林大学地球科学学院|青海省第一地质勘查院&青海省柴达木周缘大型超大型金矿深部探测技术创新工程技术中心|吉林大学地球科学学院|青海省第一地质勘查院&青海省柴达木周缘大型超大型金矿深部探测技术创新工程技术中心|吉林大学地球科学学院|吉林大学地球科学学院|吉林大学地球科学学院
基金项目：
- 中国地质调查局整装勘查项目（121201004000150017）
详细信息：
- 作者简介：
- 姜芷筠（1995—），女，吉林辽源人，硕士研究生，研究方向为矿产普查与勘探；长春市建设街2199号，吉林大学地球科学学院，130061；E-mail：316326840@qq.com
- 通讯作者：
- E-mail：503996444@qq.com，13897455329
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U-Pb ages,Hf isotope of zircons from granite porphyry in Xijinggou,Tanjianshan Gold Field,Northern margin of Qaidam Basin,and their relations to the gold mineralization
- English Author：
- College of Earth Sciences,Jilin University|Qinghai First Geological Exploration Institute&Deep Exploration Technology Innovation Engineering Technology Center of Large and Super Large Gold Deposits around Qaidam，Qinghai Province|College of Earth Sciences,Jilin University|Qinghai First Geological Exploration Institute&Deep Exploration Technology Innovation Engineering Technology Center of Large and Super Large Gold Deposits around Qaidam，Qinghai Province|College of Earth Sciences,Jilin University|College of Earth Sciences,Jilin University|College of Earth Sciences,Jilin University
- Unit：
- 摘要
- 在线预览
- 参考文献
摘要:
滩间山金矿田位于柴北缘超高压变质带的西段，其中的金矿床为典型中温热液脉型金矿床。细晶沟花岗斑岩的锆石U-Pb定年和Hf同位素测试结果显示：细晶沟花岗斑岩中锆石的206Pb/238U加权平均年龄为359.9 Ma±1.7 Ma（MSWD=0.15）；其176Hf/177Hf值为0.282 515～0.282 788，对应εHf(t)值为-1.4～8.2，两阶段模式年龄（TDM2）为743～1 238 Ma，表明细晶沟花岗斑岩的物质来源较为复杂，岩浆源区应以新元古代新生地壳物质为主，有中元古代地壳物质的混入。结合区域构造演化特征，认为细晶沟花岗斑岩为软流圈地幔上涌，下地壳物质发生部分熔融的产物，形成于后碰撞伸展构造背景，滩间山金矿田的金矿化与该花岗斑岩有关。
关键词:
锆石U-Pb定年；Hf同位素；金矿化；细晶沟；花岗斑岩；滩间山金矿田
Abstract:
Tanjianshan Gold Field sits on the west part of Qaidam ultrahigh-pressure metamorphic belt.The gold deposits in the field are typical mesothermal fluid vein type gold deposits.U-Pb dating and Hf isotopic compositions of zircons from Xijinggou granite porphyry shows that zircons from Xijinggou granite porphyry yield weight mean 206Pb/238U age of 359.9 Ma±1.7 Ma(MSWD=0.15),its 176Hf/177Hf value is 0.282 515-0.282 788,and corresponding εHf(t) values range from -1.4-8.2 and the two-phase model ages (TDM2) are 743-1 238 Ma.These results suggest that the Xijinggou granite porphyry was derived from complicated source,and the magma source area should be dominated by Neoproterozoic juvenile accreted lower crust materials,mixed with Mesoproterozoic crustal materials.Based on the characteristics of regional tectonic evolution,it can be seen that the Xijinggou granite porphyry is the products of asthenosphere mantle upwelling and partial melting of lower crustal materials,which was formed in the post-collision extensional tectonic setting.The gold mineralization in Tanjianshan Gold Field is related to this granite porphyry.
Keywords:
zircon U-Pb dating;Hf isotope;gold mineralization;Xijinggou;granite porphyry;Tanjianshan Gold Field
