金厂沟梁金矿区暗色脉岩的成因和意义：主要和微量元素地球化学证据

• 基础地质·矿床·盆地 • 上一篇下一篇

金厂沟梁金矿区暗色脉岩的成因和意义：主要和微量元素地球化学证据

陈军强¹，孙景贵^1,2，朴寿成³，赵俊康¹，翟玉峰⁴

1.吉林大学地球科学学院，吉林长春 130026； 2.南京大学内生金属矿床成矿机制研究国家重点实验室，江苏南京 210093；3.吉林大学地球探测科学与技术学院, 吉林长春 130026；4.内蒙古金陶股份有限公司, 内蒙古赤峰 024327

收稿日期:2005-03-07 修回日期:1900-01-01 出版日期:2005-11-26 发布日期:2005-11-26
通讯作者: 陈军强

Genesis and Significance of Dark Dikes in the Jinchanggouliang Mine Area, Inner Mongolia:Evidences from Geochemistry of the Major and Trace Elements

CHEN Jun-qiang¹,SUN Jing-gui^1,2, PIAO Shou-cheng³,ZHAO Jun-kang³, ZHAI Yu-feng⁴

1.College of Earth Sciences, Jilin University, Changchun 130061,China;2. The State Major Laboratory of Endogenic Metallic Deposit Mineralization Mechanism Research,Nanjing University,Nanjing 210093,China;3.College of GeoExploration Science and Technology, Jilin University, Changchun 130026,China;4.Jintao Stock Limited Company, Chifeng 024327,China

Received:2005-03-07 Revised:1900-01-01 Online:2005-11-26 Published:2005-11-26
Contact: CHEN Jun-qiang

摘要/Abstract

摘要： 金厂沟梁金矿区中与成矿伴生的暗色脉岩主要是细晶闪长岩-石英闪长岩、闪长玢岩-英安斑岩类。细晶闪长岩-石英闪长岩的ALK值为5.47％~5.88％，K₂O/Na₂O值为0.455~0.496，属钙碱性岩系，并具有Ⅱ型Adakite岩的性质；闪长玢岩-英安斑岩的ALK值为7.83％~8.28％，K₂O/Na₂O值为1.100~1.747，属粗安岩系。元素地球化学特征显示：细晶闪长岩-石英闪长岩的岩浆源于富集地幔或洋壳俯冲脱水交代的下地壳，地壳增厚过程产生并就位；闪长玢岩-英安斑岩类的岩浆就位相对晚，来源具有上地壳性质或被地壳物质强烈混染，地壳减薄过程形成；这种特征暗示金厂沟梁金矿形成的地球动力学背景是在地壳挤压增厚转化为伸展减薄过程。

关键词: 金厂沟梁, 暗色脉岩, 元素地球化学, 地球动力学

Abstract: The dark dikes associated with mineralization in the Jinchanggouliang mine area, are mostly fine dioritequartz diorites and diorite porphyritedacite porphyries. The ALK of the fine dioritequartz diorites is 5.47%~5.88%, ratio of K₂O/Na₂O is 0.455~0.496. Therefore, it belongs to calcalkalic rock series and shows the characters of Ⅱtype Adakite; The ALK of dioritic porphyritedacite porphyries is 7.83％~8.28％, ratio of K₂O/Na₂O is 1.100~1.747, belonging to shoshonitic rock series. The characteristics of elements shows that magma of fine dioritequartz diorites derived from the enriched mantle or lower crust undergone ocean crust subducting and dehydrating, and was formed and emplaced in the process of crust growth. The magma of dioritic porphyritedacitic porphyries emplaced relatively late, it might derive from upper crust or undergo intensive contamination of crustal materials, and was formed in the proces of crust thining. These characteristics suggest that the geodynamics background of the Jinchanggouliang gold deposit formation is the transition process from compression to extension.

Key words: Jinchanggouliang, dark dikes, element geochemistry, geodynamics

中图分类号:

P588.13

陈军强，孙景贵，朴寿成，赵俊康，翟玉峰. 金厂沟梁金矿区暗色脉岩的成因和意义：主要和微量元素地球化学证据[J]. J4, 2005, 35(06): 707-0713.

CHEN Jun-qiang,SUN Jing-gui, PIAO Shou-cheng,ZHAO Jun-kang, ZHAI Yu-feng. Genesis and Significance of Dark Dikes in the Jinchanggouliang Mine Area, Inner Mongolia:Evidences from Geochemistry of the Major and Trace Elements[J]. J4, 2005, 35(06): 707-0713.

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