金沙江—红河走滑构造与富碱斑岩铜金多金属成矿作用的关系  

Relationship between Jinshajiang-Honghe strike-slip fault and Cu-Au polymetallic mineralization of alkaline-rich porphyry

作　　者：王建华 李文昌[2] 和文言[3] 米云川 WANG Jianhua;LI Wenchang;HE Wenyan;MI Yunchuan(Research Center of Natural History and Culture,Qujing Normal University,Key Laboratory of Yunnan Province Universities of Qujing Natural History and Early Vertebrate Evolution,Qujing 655011,Yunan,China;Faculty of Land and Resource Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;State Key laboratory of Geological Processes and Mineral Resource,China University of Geosciences,Beijing 100083,China;Yunnan Institute of Geological Survey,Kunming 650216,Yunnan,China)

机构地区：[1]曲靖师范学院自然历史文化研究中心,云南省高校曲靖自然历史与古鱼演化重点实验室,云南曲靖655011 [2]昆明理工大学国土资源工程学院,云南昆明650093 [3]中国地质大学地质过程与矿产资源国家重点实验室,北京100083 [4]云南省地质调查院,云南昆明650216

出　　处：《中国地质》2023年第5期1542-1556,共15页Geology in China

基　　金：云南省基础研究计划青年项目(202001AU070145);现代古生物学和地层学国家重点实验室(中国科学院南京地质古生物研究所)开放课题(213117)联合资助。

摘　　要：【研究目的】金沙江—红河富碱斑岩及铜金多金属成矿带展布于青藏高原东南缘,北部产有玉龙超大型铜钼矿床,中部发育北衙超大型金多金属矿床,在南部的金平(铜厂)地区,铜钼(金)多金属成矿亦显现潜力,是中国西南地区最重要的铜金矿集区之一,已成为东特提斯成矿域内的研究热点。【研究方法】本文在该富碱岩浆成矿带内长期工作的基础上,结合已有的研究,概述了该带内典型富碱斑岩和矿床特征。【研究结果】富碱斑岩总体上以二长花岗斑岩和石英正长斑岩为主,显示富集碱质(K_(2)O+Na_(2)O含量高)、铝、轻稀土元素及亏损重稀土元素和高场强元素的特性,相似的Sr-Nd同位素组成显示源区主要为下地壳物质;同时在野外调查工作的基础上,讨论了区域走滑构造之次一级构造的发育特征及其对本区成岩成矿的制约,并进一步总结了东特提斯成矿域内受控于金沙江—红河区域走滑深大断裂及其次级构造活动的“区域构造-富碱岩浆-铜金多金属”成矿作用。【结论】通过上述三地(玉龙、北衙、铜厂)主要矿区内主控岩断裂构造野外特征观察研究,提出金沙江—红河深大断裂的次一级近北西向构造控制了本区富碱岩浆活动及铜金多金属成矿的认识。This paper is the result of mineral exploration engineering.[Objective]The Jinshajiang-Honghe alkaline-rich porphyry Cu-Au polymetallic metallogenic belt,which produces numbers of large-scale Cu-Au deposits including the Yulong at the north,the Beiya in the middle and the Tongchang at the south,for example,has becoming one of the most productive ore clusters and research focus in the east Tethys domain.[Methods]Based on long-term integrated field investigations and published data analysis,we summarized the characteristics of the typical deposits and the alkaline-rich porphyry.[Results]The alkaline-rich porphyry mainly consists of monzonitic granite porphyry and quartz syenite porphyry,showing high contents of K_(2)O-Na_(2)O,Al_(2)O_(3),LREE and deficit in HREE and HFSE.Similar Sr-Nd isotopic composition indicates that the source area is mainly lower crust material.The development characteristics of regional strike-slip structures and their constraints on diagenesis and mineralization in this area are also discussed,and a"regional structure→alkaline-rich magma→Cu-Au polymetallic"mineralization process controlled by the deep Jinshajiang-Honghe strike-slip fault and its secondary structure activities in the east Tethys metallogenic domain is further summarized.[Conclusions]Through field observation and study on the main faults in the three typical areas,we suggest that the alkaline-rich magma and related Cu-Au mineralization were primarily controlled by the secondary northwestward faults of the regional Jinshajiang-Honghe strike-slip fault.

关 键 词：富碱斑岩 构造-岩浆-成矿耦合 成矿系统 金沙江—红河走滑断裂 矿产勘查工程 

分 类 号：P618.2[天文地球—矿床学]