碾子沟金红石矿床基本地质特征

碾子沟金红石矿区地层主要为上太古界变粒岩、斜长角闪片岩及榴闪岩 ;岩浆岩主要为晋宁期基性岩 ;构造主要为断裂。矿区蚀变岩发育 ,主要为细晶直闪片岩、粗晶直闪岩、中细晶滑石岩及细晶绿泥片岩。矿体呈似纺锤状、似板状及透镜状。矿石类型有浅褐色细晶直闪石型片状矿石、灰白色粗晶直闪石型块状矿石、灰绿色或灰白色中细晶滑石型块状矿石、黑色中细晶角闪石型片状矿石及灰绿色巨晶直闪石型块状矿石等 5种。以前 3种为主 ,矿石品位一般 2 %～ 15 %。矿床规模为大型 ,矿床为变质蚀变成因。

PRIMARY GEOLOGICAL CHARACTERS OF RUTILE DEPOSIT IN LIANZIGOU VILLAGE

The strata hosting the Lianzigou rutile deposit are dominated by Archean metamorphic rocks of leptynite, amphibolite and garnet taramitite, by Jinning magmatic rock of basic rock and by structures of fault, etc. In the mining area, there is plenty of altered rocks consisting essentially of fine crystallized anthophyllite schist, coarse crystallized anthophyllitite, middle to fine crystallized talc rock and fine crystallized chlorite schist. The ore bodies are present as spindle , plank and lens like, made up of several ore types including light brown, schistose, fine crystallized anthophyllite ore, offwhite, massive, coarse crystallized anthophyllite ore, pale green or white, massive, middle to fine crystallized talc ore, black, schistose, middle to fine crystallized amphibolite ore and pale green, massive, mega crystallized anthophyllite ore. The former three ores generally take as leading place, graded at 2%～15%. The deposit is proven as large sized, probably attributed to metamorphism and alternation.