宁夏中卫市峡子沟铜矿地质特征及成因分析

发布时间：2018-02-05 05:56

本文关键词： 峡子沟铜矿床成矿地质特征砂岩型铜矿矿床成因找矿标志　出处：《中国地质大学(北京)》2015年硕士论文　论文类型：学位论文

【摘要】：峡子沟铜矿床产出于香山奥陶纪—奥陶纪陆缘斜坡盆地及香山-卫宁北山志留纪-泥盆纪前陆盆地交汇部位,处于白银-南西华山多金属成矿带东部。区域位于宁夏中南部香山一天景山构造带,是宁南弧形构造带的重要组成部分。区域内地层属华北地层大区,秦祁昆地层区,祁连北秦岭地层分区,宁夏南部地层小区。大地构造位于位于宁南弧形构造带的双铺-马家滩冲断体的香山-天景山冲断席,主要构造活动为加里东期期、印支期、燕山期和喜马拉雅期。早期的构造活动为本区铜矿沉积奠定了基础。在对峡子沟矿床进行详细的野外调研、室内测试和综合分析的基础上,剖析了其成矿地质特征、矿床成因和成矿条件,厘定了找矿标志。取得了以下成果:1.研究区铜矿化赋存地层为泥盆系老君上组下段,圈定一个矿体,其含矿岩性为浅紫红色石英砾岩;顶板为灰-浅灰色石英砂岩,底板为紫红色泥岩。矿体沿走向延伸509m,倾向延伸443m,平均厚度1.24m;矿体走向160°-180°,矿体倾向呈南西,矿体倾角10°-21°;呈似层状。2.矿石自然类型为空隙式填充及裂隙式填充。矿石矿物为孔雀石、蓝辉铜矿、辉铜矿、黝铜矿、铜蓝。孔雀石四边形及不规则粒状,星散状及浸染状分布于石英间隙,或裂隙充填呈脉状。黝铜矿呈星散状、浸染状不均匀分布于岩石中,或呈断续脉状、网脉状裂隙充填。以裂隙充填为主。3.峡子沟铜矿区的找矿标志有:地层标志—铜矿赋存于泥盆系上统红色岩层与浅色岩层的变化地层;岩性标志—泥盆系老君组下段中下部沉积的浅色砾岩、砂岩夹层是矿区的岩性找矿标志;矿化标志—孔雀石化矿化是矿区的直接找矿标志;环境标志—晚古生代山涧河湖相沉积场所为理想的找矿标志和结构构造—内部孔隙、节理和裂隙发育愈强烈,则矿化较好,可以作为间接找矿标志。4.峡子沟铜矿经历同生沉积和后期淋滤富集两个阶段过程。
[Abstract]:The Xianzigou copper deposit is located in the Ordovician Ordovician slope basin and the Silurian Devonian Foreland basin in Xianshan-Weining Beishan. It is located in the eastern part of Baiyin-South Xihuashan polymetallic metallogenic belt. The area is located in the Tianjingshan structural belt of Xiangshan, central and southern Ningxia, which is an important part of the arc-shaped tectonic belt in southern Ningxia. The strata in the region belong to the North China stratigraphic region. Qinqi-Kun stratigraphic area, Qilian North Qinling stratigraphic division, southern Ningxia stratigraphic district. The geotectonics are located in the Xiangshan-Tianjingshan thrust mat of Shuangpu Majiatan thrust body located in the arc-shaped structural belt of southern Ningxia. The main tectonic activities are Caledonian, Indosinian, Yanshanian and Himalayan periods. The early tectonic activities laid the foundation for the deposit of copper deposits in this area. On the basis of laboratory test and comprehensive analysis, the metallogenic geological characteristics, ore genesis and metallogenic conditions are analyzed. The ore-prospecting criteria have been determined. The following results have been obtained: 1.The ore-bearing strata of the copper deposit in the study area are the upper and lower member of Laojun formation of Devonian series, and a orebody is delineated, the ore-bearing rock of which is fuchsia quartz conglomerate; The roof is gray-grayish quartz sandstone and the bottom is fuchsia mudstone. The orebody extends 509m along the strike and tends to extend 443m with an average thickness of 1.24m. The orebody strike 160 掳-180 掳, the orebody inclines to the south west, the orebody inclination angle is 10 掳-21 掳; The mineral minerals are malachite, blue chalcocite, chalcopyrite, tetrahedrite, copper blue, malachite quadrilateral and irregular granular. Scattered and disseminated in quartz gap, or fissures filled with veins. Tetrahedrite is scattered, disseminated inhomogeneously in rocks, or in intermittent veins. Net vein fissure filling. Fissure-filling is the main ore-prospecting marker in Xiaxigou copper deposit area: strata landmarks-copper deposits occur in the changing strata of red and light-colored strata of Upper Devonian series; The lithologic marker is the light color conglomerate in the lower part of Laojun formation of Devonian, and the sandstone intercalation is the sign of lithologic prospecting in the mining area. Peacock petrifaction mineralization is the direct prospecting mark of mining area. The environment marker-late Paleozoic mountain stream river lake facies sedimentary place is the ideal prospecting mark and the structure structure-internal pore, the stronger the joint and the fissure develops, the better the mineralization is. It can be used as an indirect prospecting marker. The Xiazigou copper deposit has two stages: synsedimentary and late leaching and enrichment.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.41

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