和静备战铁矿床地质特征及控矿因素分析

Geological Features and Ore-Controlling Factors for the Beizhan iron Deposit in Hejing,Xinjiang

新疆和静县备战铁矿位于巩乃斯石炭纪裂谷带东端楔形尖灭部位,矿体受下石炭统大哈拉军山组灰岩与华力西中期石英二长斑岩体接触带的控制。矿区内存在一个从基性→酸性,从橄榄玄武岩→玄武岩→安山岩→英安岩→霏细岩(流纹岩)演化的火山熔岩系列,同时发育大量火山碎屑岩及火山碎屑沉积岩,构成大哈拉军山组主体地层,为备战铁矿成矿的最有利层位。矿区南北两侧均为近EW向断裂构造,具压扭性质,是一个长期活动的构造薄弱带,有利于火山活动及岩浆岩侵入。从矿床地质特征出发,概括了该矿床的基本控矿因素,为下一步该类型铁矿床找矿提供依据。

The Beizhan iron deposit is located in the eastern cuniform tip of the Carboniferous rift valley belt in Gongnaisi,the orebody controlled by contact zone of Dahalajunshan formation in late Carboniferous and beschtauite in the medium-term of Variscan.There is a volcanic lava from basic to acidic,Olivine basalt→basalt→andesite→dacite→felsite （rhyolite） in mining area,aLso developed a lot of pyroclastic rocks and volcanic clasfic sedimentary rocks,mainLy constitutes Dahalajunshan formation,it is also a favorable horizon for iron ore-formation in Beizhan.The north and south sides of the mining area was nearly a E-W trending fault,with transpressional properties,is a activities structure weak zone,it is in favor of volcanic activities and the invasion of the magmatic rocks.From geological characteristics to start,summarized the basic ore-controlling factors in this deposit,provided the basis for the next type in prospecting of iron ore.