摘要
珠尔很沟锰铁矿位于兴蒙造山带东部,是一处典型的增生造山带型锰铁矿.矿区含矿地层为一套正常沉积碎屑岩,岩性组合为长石石英砂岩、含铁锰染长石石英砂岩、铁锰矿层及粉砂岩,总厚度265 m.地层受北西向背斜控制,矿体分布于背斜构造两翼的杂砂岩与蛇绿混杂岩的层间破碎带中.矿床的形成经历了化学沉积、热液交代、风化淋滤等阶段,成矿物质来源主要为区内超基性混杂岩,该超基性混杂岩体中含有丰富的铁、锰质,经风化剥蚀后,搬运至盆地中形成了铁锰的初始矿源层,经后期热液改造、受风化剥蚀及淋滤作用后,形成了该铁锰矿床.
Abstract
The Zhuerzhougou ferromanganese deposit is located in the eastern part of the Xingmeng Mountain Orogenic belt,which is a typical accretionary orogenic belt.The ore-bearing strata in the mining area consist of a set of normal sedimentary clastic rocks,with a lithologic assemblage of feldspar quartz sandstone,Fe-Mn stained feldspar quartz sandstone,Fe-Mn deposit,and siltstone,totaling a thickness of 265 m.The strata are controlled by a northwest anticline,and the ore bodies are distributed within the interlayer broken zone of the gritstone and melange on the two wings of the anticline structure.The ore minerals primarily include hematite,hard manganese,pyrolusite,goethite,fibritite(limonite),and silver pyroxene.The metallogenic geological process of this deposit has experienced three stages:colloidal chemical sedimentary differentiation,hydrothermal metasomatism,and weathering leaching metasomatism.The main source of ore-forming materials is the ultrabasic melanomy in the area,which is rich in iron and manganese.After weathering and denudation,an initial source layer of iron and manganese is formed in the basin.The iron manganese deposit was formed following hydrothermal transformation,weathering denudation,and leaching.
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