摘要
哀牢山金矿带是我国最重要的新生代造山型金矿带,老王寨金矿床是该矿带中已发现规模最大的金矿床。该矿床中金矿化的产出受NW向九甲-安定断裂和NWW向老王寨-营盘山背斜联合控制,金矿体定位于老王寨-营盘山背斜两翼NW-NWW向层间接触带或脉岩与地层交界面等构造薄弱部位的左行剪切逆断裂带中。成矿前,区域NNE-SSW向挤压构造应力场导致轴向NWW的老王寨-营盘山背斜形成,背斜形成晚期在其两翼形成NW-NWW向的次级断裂。成矿作用过程中,在NEE-SWW向挤压构造背景下,NWW向老王寨-营盘山背斜的转折端和两翼呈背驮式叠瓦状排列的NW-NWW向左行剪切逆断裂为有利容矿空间。之后,构造体制转变为近SN向挤压,形成少量NE向左行剪切断裂,对已有NW向矿体略有破坏。走滑断裂是哀牢山造山带最具特色的构造型式,也是区域最重要的控矿构造样式,在老王寨金矿床主要体现为控制金矿化产出的NW-NWW向左行剪切逆断裂大规模发育于NWW向老王寨-营盘山背斜构造的两翼,对应于区域构造动力体制转换晚期,印度与欧亚大陆斜碰撞导致的区域大规模走滑断层最发育时期。
Ailaoshan gold belt,formed in the Cenozoic,is one of the most important orogenic-type gold belts in China,and Laowangzhai is the biggest gold deposit in this belt.The orebodies in Laowangzhai gold deposit are mainly controlled by the NW-trending Jiujia-Anding fault and NWW-trending Laowangzhai-Yingpanshan anticline,and occurred in the fracture zones which are mainly the contact zones between different layers on limbs of Laowangzhai-Yingpanshan anticline.Before the mineralization,the Laowangzhai-Yingpanshan anticline formed during the NNE-SSW-trending compression,and the NW-to NWW-trending faults formed in the limbs of this anticline.During the mineralization,the regional tectonodynamic is characterized by the NEE-SWW-trending compression,and the saddle of Laowangzhai-Yingpanshan anticline and occurrence change locations of NW-and NWW-striking sinistral-shearing reverse faults are the favorable ore-forming spaces.After mineralization,there formed few NE-trending sinistral shearing faults that resulted from the S-N-trending compression to destroy the orebodies.Ailaoshan orogenic belt is characterized by the NW-trending shearing faults which are the most important ore-controlling structures in this belt.In the Laowangzhai gold deposit,during the gold mineralization,the NW-and NWW-trending ore-controlling faults formed in the limbs of NWW-trending folds that corresponding to the collision between India and Eurasia that leaded to the developed of NW-and NWW-trending shearing faults.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第12期4109-4124,共16页
Acta Petrologica Sinica
基金
国家重点基础研究发展规划(2009CB421008)
北京市优秀博士学位论文指导教师科研项目(20111141501)
教育部新世纪优秀人才支持计划(NCET-09-0710)
高等学校学科创新引智计划(B07011)联合资助
关键词
老王寨金矿床
哀牢山金矿带
造山型金矿
控矿构造样式
Laowangzhai gold deposit
Ailaoshan gold belt
Orogenic gold deposit
Structural controlling pattern
