摘要
东川裂谷因民期火山—岩浆活动强烈，也是重要的铁铜成矿期。火山活动旋回均经历爆发—喷发—喷溢—（喷流）阶段。主要发育在裂谷中心落因火山链和蓑衣坡火山盆地中。落因火山链早期形成火山—沉积角砾岩段，火山活动以喷溢的火山熔岩为主，主要有钠质基性熔岩、玄武岩、安山岩，均已蚀变，并有钠长斑岩的侵入活动。中期火山喷发形成凝灰岩类、火山碎屑岩类，发育了铁铜矿化。在蓑衣坡火山盆地中因民期火山—岩浆活动发育两次火山—沉积旋回，即两次爆发（角砾岩）—喷发（凝灰岩）—喷溢（熔岩）—喷流（硅质岩），在喷流相发育赤铁矿层和含铜硅质岩层。
The volcanism and magmatism was violent in the Dongchuan rift at the Yinmin stage,when was also the important epoch for Fe and Cu mineralization.The volcanic cycle was from explosion,eruption,effusion to (exhalation),and mainly developed in the Luoxue Yinmin volcanic chain and the Shuaiyipo volcanic basin in the rift center.The Luoxue Yinmin volcanic train was composed of volcanic sedimentary breccia in the early stage,being mainly valcanic lava from effusion,including sodium basic lava,basalt,andesite which are all alterated and accompanied by intrusion of albitophyre.In the middle stage volcanic eruption formed tuffs and volcanic breccias with Fe Cu mineralization.Two cycles of volcanic sedimentation,explosion(breccia) eruption(tuff) effusion(lava) exhalation(silicolite) were developed in the Shaiyipo volcanic basin at the Yinmin stage.Hematite bed and copper bearing silicolite bed were developed in the exhalative facies.
出处
《矿产与地质》
1997年第4期236-242,共7页
Mineral Resources and Geology
关键词
铜矿床
铁矿床
成矿期
火山活动
岩浆活动
Dongchuan rift,Yinmin stage,Submarine exhalation,Silicolite,Fe Cu deposit
