四川甘洛县尔呷地吉铅锌矿床滑覆构造特征及其控矿作用  

Characteristics of Gliding Nappe Structure and Ore-Controlling Mechanism of Ergadiji Lead-Zinc Deposit in Ganluo County,Sichuan Province

作　　者：李阳[1] 许加田 谭晓莲[1] 高冲军 吴贤辉[1] 康鹏 杨长勇[1] LI Yang;XU Jiatian;TAN Xiaolian;GAO Chongjun;WU Xianhui;KANG Peng;YANG Changyong(Sichuan Metallurgical Geological Exploration Bureau Chengdu Geological Survey Institute,Chengdu,Sichuan 610203;College of Earth Sciences,Chengdu University of Technology,Chengdu,Sichuan 610059;Ganluo Ergadiji Lead and Zinc Company,Liangshan Yi Autonomous Prefecture,Sichuan 615000)

机构地区：[1]四川省冶金地质勘查局成都地质调查所,四川成都610203 [2]成都理工大学地球科学学院,四川成都610059 [3]甘洛县尔呷地吉铅锌矿业有限公司,四川凉山彝族自治州615000

出　　处：《地质与勘探》2022年第4期740-755,共16页Geology and Exploration

摘　　要：四川甘洛县尔呷地吉铅锌矿床位于甘洛-小江断裂带中的马拉哈断裂西侧,构造复杂,不仅有褶皱、断裂构造,还有滑覆构造。为指导该地区深部找矿,在分析区域地质构造背景和矿床地质构造特征的基础上,重点研究了尔呷地吉铅锌矿床滑覆构造的特征及其控矿作用。通过大量地质剖面对比分析研究,提出了该滑覆构造为燕山晚期形成,其滑覆运动驱动力是受其东侧苏雄背斜抬升隆起后,在重力作用下向下滑动而形成,其后又遭受区域马拉哈断裂复活挤压抬升及左旋剪切作用的改造,先后又形成了沙岱向斜及一组由北北西-南南东转向南东东的弧形断裂。滑覆构造和其后的沙岱向斜及其派生构造控制了铅锌矿体的形成、定位和空间分布规律。通过对其南侧苏雄向斜构造格架的对比分析和区内马拉哈倒转褶皱特征及控矿条件分析,构建该区找矿预测地质模型,提出滑覆构造中下伏系统和马拉哈倒转向斜核部将是今后甘洛铅锌成矿带深部勘查的有利部位。The Ergadiji lead-zinc deposit of Ganluo County,Sichuan Province,is located in the west of Malaha regional fault in Ganluo-Xiaojiang fracture belt.The tectonics is complex with fold structures,fault structures and gliding nappe structures.The purpose is to guide the deep prospecting in this area.Based on the analysis of regional geological tectonic background and mineral deposit structural properties,this paper focuses on the characteristics of Ergadiji lead-zinc deposit’s gliding nappe structure and ore-controlling mechanism.Through comparative analysis and study of various geological sections,it is inferred that the gliding nappe structure was formed in the late Yanshanian period during which the gravity was the driving force after the formation of Suxiong anticline uplift on the east,and then reformation(including compression,uplift and left-lateral shear)by the reactivation of Malaha regional fault.These movements caused the formation of Shadai syncline and a host of NW-SEE changing to SEE arc fractures.The gliding nappe structure and Shadai syncline and its associated structures control the formation,location and spatial distribution of lead-zinc deposits.Through the comparative analysis of the Suxiong syncline’s tectonic framework and Malaha overturned fold’s characteristics and ore-controlling mechanism,a geological prospecting model was established.It is indicated that the blocks under the gliding nappe structures and the core of the Maha overturned syncline are favorable for the future deep prospecting in the Ganluo lead-zinc metallogenic belt.

关 键 词：滑覆构造 控矿作用 铅锌矿床 尔呷地吉 甘洛县 四川省 

分 类 号：P612[天文地球—矿床学]