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延边赤卫沟金矿床成矿物质来源及成矿机制研究
- 作者：
- 王硕|李志谦|刘云华|田育功|刘占晋
- 作者单位：
- 长安大学地球科学与资源学院|长安大学地球科学与资源学院|长安大学地球科学与资源学院|长安大学地球科学与资源学院|长安大学地球科学与资源学院
基金项目：
- 国家自然科学基金项目（41872219）；中国地质调查局项目（211527200344）
详细信息：
- 作者简介：
- 王硕（1984—），男，副教授，博士，从事矿床地质及流体成矿作用研究工作；E-mail:iamsure1984@163.com
- 通讯作者：
- isnull
- PDF下载
Sources of metallogenic materials and metallogenic mechanism of Chiweigou Gold Deposit,Yanbian
- English Author：
- School of Earth Sciences and Resources,Chang’an University|School of Earth Sciences and Resources,Chang’an University|School of Earth Sciences and Resources,Chang’an University|School of Earth Sciences and Resources,Chang’an University|School of Earth Sciences and Resources,Chang’an University
- Unit：
- 摘要
- 在线预览
- 参考文献
摘要:
赤卫沟金矿床位于天山—兴蒙造山系东段的吉黑成矿带，该成矿带属于古亚洲洋构造域与滨太平洋构造域的叠加转换部位。矿区内矿体赋存于侵入早白垩世中酸性陆相火山岩中的方解石脉内，金矿物除了以自然金形式产出外，碲化物也是金的主要赋存方式，显示了地幔来源的特点，其与方解石、石英、磷灰石、赤铁矿等火成碳酸岩中常见矿物共生，显示了其成因上的联系；围岩蚀变以碳酸盐化为主，可见典型的霓长岩化蚀变矿物组合，发生了明显的碱交代作用。稀土元素球粒陨石标准化配分曲线为一致的右倾型，显示出明显轻稀土富集特征（w(LREE)/w(HREE)=5.51~9.55），且具有Eu正异常和弱Ce负异常；微量元素中富集不相容元素（Rb、Sr、Hf），其中Sr正异常显著。C、O同位素示踪显示,赤卫沟金矿床方解石脉来自幔源岩浆区。基于上述研究并结合前人成果，认为赤卫沟金矿床含金方解石脉为火成碳酸岩岩浆成因，为中生代晚期太平洋板块俯冲背景下局部伸展环境的产物，在地壳浅部就位过程中与大气降水混合，导致温度、压力降低及发生脱碱作用，金在这一过程中沉淀成矿。
关键词:
赤卫沟金矿床；岩石地球化学；C、O同位素；成矿机制；碳酸岩；方解石
Abstract:
The Chiweigou Gold Deposit is located on the Hei-Ji metallogenic belt,the eastern part of the Tianshan-Xingmeng orogenic system,which is a part of the superimposition and transition section between the Paleo-Asian Ocean and Circum-Pacific tectonic domains.Ore bodies in the area are hosted by calcite veins,which intruded in the Early Cretaceous intermediate acidic volcaniclastic rocks.The main carriers of the Au are telluride besides native gold,indicating a mantle source.Its association with commonly seen igneous carbonates such as calcite,quartz,apatite,and magnetite indicates genesis connections;the wall rock alteration is dominated by carbonatization,typical altered mineral assemblage of fenitization can be observed,and obvious alkaline metasomatism took place.The uniform rightward inclina-tion of REE spherical particle normalized distribution patterns indicated evident characteristics of LREE enrichment （w(LREE)/w(HREE)=5.51-9.55） and positive Eu and negative Ce anomalies; trace elements enrich incompatible element(Rb,Sr,Hf),and Sr has an evident positive anomaly.The C,O isotopic tracing indicates that the calcite veins that occurred within the Chiweigou Gold Deposit were derived from mantle magma.Based on these results,together with the predecessors’ studies,the genesis of Chiweigou Au-bearing calcite veins is igneous carbonate magma and the result of a local extensional tectonic environment related to the subduction of the Pacific plate in the Late Meso-zoic.When settling in the shallow part of the crust,they mix with precipitation,leading to dropping temperature and pressure and then dealkalization.During the process,gold precipitated and enriched into ores.
Keywords:
Chiweigou Gold Deposit;lithogeochemistry;C,O isotopes;ore-forming mechanism;carbonate;calcite
