西藏江达县加多岭铁矿床地质特征及成因分析

The Geologic Characteristic and Genesis of Jiaduoling's Porphyrite-type Iron Deposit,Jiangda,Tibet,China

加多岭玢岩型铁矿床位于治多-江达-维西陆缘弧带,处于波罗-德登背斜中部。矿区内出露主要地层为晚三叠世洞卡组(T3dk)、晚三叠世甲丕拉组(T3j),岩性主要为灰岩,砂质灰岩。岩浆岩主要为印支期闪长岩、闪长玢岩。矿区构造较复杂,主要断裂及挤压带为成矿提供了较好的容矿导矿构造。本文通过介绍区域地质背景,矿区地质特征,初步分析了加多岭铁矿床的成因,认为该矿床属于玢岩型矿床。

Jiaduoling＇s porphyrite-type iron deposit is located in Zhiduo-Jiangda-Weixi precontinental are belt, lie in the mid position of Boluo-Dedeng anticline. The main exposure stra in the digging is Dongka formation, Late-Triassic （T3dk）, Jiapoula formation, Late-triassic （T3j）. The lithology in mainly limestone, sandy-lime. The magmatic rock are mainly diorite, diorite porphyrite of indo-china period. There are complex structure in mining area, the mainly fracture and compressive zone provide high-class ore-bearing zone and ore-fluid channel way. In this paper, based on the regional geologic background, the geologic characteristic of mining area, the genesis of the Jiaduoling iron deposit is analyzed and conclude that it is porphyrite-type deposit.