新疆库车盆地康村地区砂岩型铜矿成矿模式研究  

The metallogenic model of the sandstone-type copper deposits in the Kangcun area,Kuqa Basin,Xinjiang

作　　者：蔡厚安[1] 高海欧 范世家[1] 肖文进[1] 张磊 CAI Houan;GAO Haiou;FAN Shijia;XIAO Wenjin;ZHANG Lei(China Non-Ferrous Metals Resource Geological Survey,Beijing 100012,China)

机构地区：[1]有色金属矿产地质调查中心,北京100012

出　　处：《地质力学学报》2022年第1期78-89,共12页Journal of Geomechanics

基　　金：中国地质调查局地质调查项目(DD20160001)。

摘　　要：新疆库车盆地分布着一系列砂岩型铜矿床和矿点,文章在野外调查的基础上开展康村地区铜矿沉积环境和成矿模式研究,总结了区内沉积环境、沉积相与铜矿化体的配置关系,进而探讨了矿化成因和成矿模式。结果表明:康村地区新近系中可以识别出主要的沉积相类型有冲积扇相、扇三角洲相和湖泊相,以及5种亚相和7种微相。砂岩型铜矿化与沉积环境相关,矿(化)体主要分布在扇三角洲平原相和扇三角洲前缘相。2件样品LA-ICP-MS测年数据分别为427.4±6.6 Ma、387.3±3.3 Ma和424.6±2.3 Ma、279.9±6.8 Ma,表明康村地区中新统吉迪克组(N_(1)j)含铜砂砾岩的物源主要来自于库车盆地北西南天山造山带古生代晚志留世至早二叠世地质演化所形成的地层和岩浆岩产物。康村地区的矿化类型为砂岩型铜矿化,深部铜富集为硫酸盐热化学还原作用(TSR)型矿化成因,近地表矿化为后期盆地地上和地下卤水改造成因。库车盆地康村地区的铜矿化形成于新近系砂岩成岩之后,为后生富集,主要受新近纪后期断裂构造及后生卤水控制。A series of sandstone-type copper deposits and occurrence distribute in the Kuqa basin,Xinjiang.We carried out a research into the sedimentary environment and metallogenic model of the copper deposits in the Kangcun area based on field surveys.The relationship between the sedimentary environment/facies in the area and the copper mineralization were summarized so as to explore the genesis of mineralization and the metallogenic model.We identified main sedimentary facies types of alluvial fans,fan deltas,and lakes in the Neogene strata,and further identification of five subfacies and seven microfacies were made.Our research results reveal that the genesis of sandstone-type copper mineralization is related to the sedimentary environment,and the mineralized bodies are mainly distributed in fan delta plain facies and fan delta front facies.Detrital zircon dating results of two samples are 427.4±6.6 Ma,387.3±3.3 Ma and 424.6±2.3 Ma,279.9±6.8 Ma respectively.It indicates that the source of the copper-bearing sandy conglomerate in the Miocene Jidike Formation(N_(1)j)is mainly from the strata and magmatic rock products formed by the geological evolution during the Late Silurian to Early Permian.The mineralization in the Kangcun area belongs to the sandstone-type copper mineralization.The deep copper enrichment is TSR-type mineralization,and the surface mineralization is caused by the surficial and underground brine.The copper mineralization in the Kangcun area was formed after the diagenesis of Neogene sandstone.It is epigenetic enrichment,and is mainly controlled by fault structure and epigenetic brine in the Late Neogene.

关 键 词：库车盆地 砂岩型铜矿 LA-ICP-MS 沉积环境 成矿模式 

分 类 号：P618.41[天文地球—矿床学]