四川冕宁茶铺子火山岩及其含矿性  

CHAPUZI VOLCANIC ROCKS AND THEIR ORE-BEARING CHARACTERISTICS FROM MIENLING, SICHUAN PROVINCE

作　　者：曾广策[1] 肖玉永[1] 

机构地区：[1]中国地质大学,武汉430074

出　　处：《华南地质与矿产》1998年第1期12-19,共8页Geology and Mineral Resources of South China

摘　　要：四川冕宁茶铺子火山岩产于扬子地台与松潘甘孜地槽褶皱带的接壤部位,是石棉西油房-冕宁茶铺子-盐源仰天窝古火山带的重要组成部分。火山岩已细碧角斑岩化,主要种属有苦橄拉斑玄武质细碧岩、橄榄拉斑玄武质细碧岩、橄榄玄武质细碧岩、碱性橄榄玄武质细碧岩、橄榄粗安质细碧角斑岩、细碧岩化碱性橄榄玄武岩、细碧角斑岩化玄武安山岩。火山岩既有碱性系列,又有拉斑系列;既有钠质类型,也有钾质类型。岩石组合和岩石化学特征表明该火山岩形成于裂谷环境,是扬子板块大陆边缘二叠纪裂谷发展最盛期的火山活动产物。火山岩的Au背景值高,火山岩的后期蚀变作用、构造活动及岩浆侵入作用既使火山岩中的金活化,又带入了深部的金,有利于金矿成矿。Chapuzi volcanic rocks occurred in Mienling of Sichuan province, where link Yangzi platform and Songpan Ganzi geosyncline zone , is important part of the old volcanic belt from Shimian Xiy-oufang to Mienling Chapuzi and Yanyuan. The volcanic rocks had suffered spilitization, most of them are picrite-tholeiitic spilite, olivine-tholeiitic spilite, olivine basaltic spilite, alkali olivine basaltic spilite, mugearitic spilite-keratophyre, spilitized alkali olivine basalt, spilitized basaltic an-desite, and contain both alkaline series and tholeiitic series, both potassium and sodium kinds. It is showed by rock assemblage and petrochemistry, that the volcanic rocks formed in a rift sitting on the continental rim of Yangzi plate when the rift acted most strongly at the late Permian. The volcanic rocks are high in Au background value. The alteration and magma intrusion happened at late are favorable to Au ore formation for it not only made the Au activation, but also brought Au from deep.

关 键 词：火山岩 金矿床 四川 成矿作用 形成机制 构造环境 

分 类 号：P588.14[天文地球—岩石学] P618.51[天文地球—地质学]