| 摘要: |
| 铁格隆地区含矿岩石以闪长玢石及石英闪长玢岩为主,属钙碱性岩系和高钾钙碱性岩系,显示I型花岗岩的特点。岩体形成于早白垩世班公湖-怒江洋盆俯冲消减构造环境,成岩岩浆属氧化型岩浆,来源于壳幔结合部,并受到壳源物质的强烈混染。与玉龙、冈底斯斑岩矿带含矿岩石进行对比,该含矿玢岩在岩石类型、岩石化学、地球化学及成岩构造环境等方面均存在明显差异,指示其成矿动力学背景、成矿机理与"碰撞"及"碰撞后"的斑岩型矿床不同,属形成于"岛弧"环境的斑岩型铜金矿床。 |
| 关键词: 改则 玢岩 斑岩型铜金矿 西藏 |
| DOI： |
| 附件 |
| 投稿时间：2006-02-15修订日期：2007-04-09 |
| 基金项目:中国地质调查局1:25万区域地质调查(200303000016)。 |
|
| Genesis of the ore-bearing porphyrite in Tiegelong, Gerze, Xizang |
| GOU Yong-dong, CHEN Yu-lu, LIU Han-qiang |
| (Sichuan Institute of Geological Survey, Chengdu 610213, Sichuan, China) |
| Abstract: |
| The ore-bearing rocks in Tiegelong, Gerze, Xizang consist of dioritie-porphyrite and quartz diorite-porphyrite which are assigned to the calc-alkaline and high-K calc-alkaline rock series characteristic of I-type granites. These rocks resulted from the tectonic settings of the Early Cretaceous Bangong Lake-Nujiang oceanic basin subduction. The rockforming magmas comprise oxidized magmas derived from the juncture of the crust and mantle and are highly contaminated by the crust-derived matter. There are gaps in rock type, petrochemistry, geochemistry and tectonic setting for the orebearing rocks from the Yulong and Gangdise porphyry belts and the copper-gold deposits in the study area, implying that the copper-gold deposits in the study area should belong to the "ialsnd-arc" porphyry-type copper-gold deposits varying from the "collision" and "post-collision" porphyry-type deposits in geodynamic setting and mineralization mechanism. |
| Key words: Gerze porphyrite porphyry-type copper-gold deposit Xizang |
