北祁连山西段双龙铁矿地质特征及矿床成因探讨
Geology and Genesis of the Shuanglong Iion Deposit in the Western Section of North Qilian Mountains
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摘要: 双龙铁矿位于北祁连西段卡瓦铁矿矿集区，是北祁连西段铁多金属成矿带内继镜铁山矿床之后新发现的又一重要沉积变质型铁矿之一。双龙铁矿矿床赋存于长城系桦树沟组浅海沉积相碎屑沉积岩，矿体多呈层状，分布和产状受控于含矿地层，矿体厚度与围岩厚度变化呈正比；矿石具细粒结构、条带状构造，品位低、变化大，具沉积变质型铁矿的特点。通过矿床成因探讨，初步认为双龙铁矿为与海底喷流作用有关的沉积变质型铁矿，并建立了矿床模型。Abstract: The Shuanglong iron deposit is located in the Kawa iron ore-concentrated area in the western section of North Qilian Mountains, which is the other important sedimentary-metamorphic iron deposit after the Jingtieshan iron deposit found within the polymetallicmetallogenic belt in the western section of North Qilian Mountains. The Shuanglong iron deposit was occurred in shallow sedimentary clastic sedimentary rocks of Changchengian Huashugou Formation. The orebodies are mostly developed as the stratiform shapes, while their distribution and occurrence were controlled by the ore-bearing strata, and their thickness vary with the ones of wall rocks. The iron ores have fine-grained structure, banded structure, low grade with great range, showing the characteristics of sedimentary-metamorphic iron ore. After discussing the genesis of this deposit, the Shuanglong iron deposit has been classified as the sedimentary-metamorphic iron deposit that related with submarine exhalative process, and the metallogenic model of this deposit has been established.
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