扎日根铁矿区地质特征及找矿潜力分析

扎日根铁矿区地处三江成矿带沱沱河段。位于巴颜喀拉晚印支褶皱造山带、羌塘陆块二大构造单元间之羌塘陆块一侧。矿区为一轴向近东西、形态不完整的背斜,出露地层为下二叠统开心岭群诺日巴尕日保组。赋矿围岩为印支期中-基性次火山岩体,东矿段赋矿岩体位于背斜核部及南翼,中、西矿段赋矿岩体位于背斜北翼。矿体主要受次火山岩体及其内部早期构造裂隙控制,矿床成因为次火山岩浆期后热液型。赋矿岩体所处构造部位有利于形成规模较大的磁铁矿床。本区用磁法寻找磁铁矿的效果较好,而目前矿区部分1∶2000磁异常没有深部工程验证或验证不足,钻探工程控制深度不够,应进一步加大对已有异常的验证力度,以扩大资源远景。矿区南部正磁异常尚未圈闭,扩大高精度磁测范围以便发现新的异常,再对异常进行反演确定磁性体分布范围及空间形态,锁定赋矿有利部位并进行钻探验证,有望在深部发现较大规模的磁铁矿体。

Geological Feature and Prospecting Potential Analysis of Zarigen Iron Deposit

Zharigen iron deposit is located in the Sanjiang metallogenic belt Tuotuohe segment, which is located in the side of Qiangtang landmass between the lated Indo-Chinese epoch Bayanhar folding-orogenic belt and Qiangtang landmass the two major tectonic units. Mine claim is an east-west axis, and an incom- plete anticline form, exposed Permian strata Kaixinling groups Nuoribagaribao group. Exist-ore country rock is Indo-Chinese epoch mafic subvolcanic rocks, the east section of the exist-ore rocks located in anti- clinal axis and south-limb, the central and western sections of the mine lie in the anticline north wing rocks. Ore body has been controlled by subvolcanic rocks and its internal early tectonic fissures, and gene- sis of this ore deposit belongs to subvolcanic magmatic hydrothermal type. Structure position of the host rock is conducive to forming large-scale magnetite bed. Using magnetic method to find magnetite is perfer- able in this area. However, the current mining area parts of 1 ： 2000 magnetic anomaly are not checked or lack of deep drilling engineering project, and the depth control is not enough. It will be expanded resource perspective, if increase further verification efforts. In southern of ore area magnetic anomaly is not yet traps, expanding the range of high-precision magnetic survey in order to find new anomaly, and then de- termine the inversion of magnetic anomalies in distribution and spatial form, locking the advantageous parts of the ore and drilling enabling authentication, expecting to found large-scale magnetite body in the deep.