墨西哥北部拉拉米期斑岩型铜矿床时空分布及典型矿床特征  

Temporal and spatial distribution and typical deposit characteristics of Laramide porphyry copper deposits in Northern Mexico

作　　者：姚春彦[1] 郭维民[1] 丁海峰 刘君安[1] 王天刚[1] YAO Chunyan;GUO Weimin;DING Haifen;LIU Jun’an;WANG Tiangang(Nanjing Center,China Geological Survey,Nanjing,210016;International Research Center of Big Data for Sustainable Development Goals,Beijing,100094;Key Laboratory of Digital Earth Science,Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing,100094)

机构地区：[1]中国地质调查局南京地质调查中心,南京210016 [2]可持续发展大数据国际研究中心,北京100094 [3]中国科学院空天信息创新研究院数字地球重点实验室,北京100094

出　　处：《地质论评》2023年第1期383-395,共13页Geological Review

基　　金：科技部“环太平洋和非洲成矿域战略性矿产信息及成矿规律”项目(编号:2021YFC2901804);地质调查“美洲大洋洲国际合作地质调查”项目(编号:中地调审[2022]0135)的成果。

摘　　要：北美斑岩型铜矿集区“大集群”是世界重要铜成矿省之一;墨西哥北部索诺拉州斑岩型铜矿带,是其在墨西哥的延伸。斑岩型铜矿床主要沿着拉拉米岩浆弧展布。拉拉米造山作用期间(80~40 Ma),由于法拉隆板块向北美板块俯冲角度的减小,岩浆活动中心逐步向东移动,形成76~70 Ma,63~57 Ma和46~40 Ma三期岩浆活动高峰期,其中63~57 Ma岩浆活动规模最大。通过对区内已有矿床的成矿时代与岩浆活动时限及矿床分布集中程度的对比研究发现,斑岩型铜成矿高峰期主要集中在63~56 Ma期间。通过典型矿床的成矿特征梳理及区域岩浆作用综合分析,笔者等认为拉拉米造山作用是区内形成巨量铜钼富集的主要地质作用。The porphyry copper belt in Sonora, northern Mexico, is an extension of the “large cluster” of North American porphyry copper ore concentration areas in Mexico, one of the world’s important copper metallogenic provinces. Porphyry copper deposits are mainly distributed along the Laramide magmatic arc. During the Laramide(80~40 Ma) orogeny, due to the reduction of the subduction angle of the Farallon plate to the North American plate, the magmatic activity center gradually moved eastward, forming three magmatic activities of 76~70 Ma, 63~57 Ma and 46~40 Ma. During the peak period, the magma activity of 63~57 Ma was the largest. Through the comparative study on the metallogenic age of the existing deposits in the area, the time limit of magmatic activity and the distribution concentration of the deposits, it is found that the peak period of porphyry copper metallization is mainly concentrated in the period of 63~56 Ma. By combing the metallogenic characteristics of typical deposits and comprehensive analysis of regional magmatism, it is believed that the Laramide orogeny is the main geological process for the formation of huge copper and molybdenum enrichment in northern Mexico.

关 键 词：拉拉米造山运动 斑岩铜矿床 时空分布 墨西哥北部 

分 类 号：P618.41[天文地球—矿床学]