發(fā)布時(shí)間：2018-02-05 05:56

  本文關(guān)鍵詞： 峽子溝銅礦床 成礦地質(zhì)特征 砂巖型銅礦 礦床成因 找礦標(biāo)志　出處：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：峽子溝銅礦床產(chǎn)出于香山奧陶紀(jì)—奧陶紀(jì)陸緣斜坡盆地及香山-衛(wèi)寧北山志留紀(jì)-泥盆紀(jì)前陸盆地交匯部位,處于白銀-南西華山多金屬成礦帶東部。區(qū)域位于寧夏中南部香山一天景山構(gòu)造帶,是寧南弧形構(gòu)造帶的重要組成部分。區(qū)域內(nèi)地層屬華北地層大區(qū),秦祁昆地層區(qū),祁連北秦嶺地層分區(qū),寧夏南部地層小區(qū)。大地構(gòu)造位于位于寧南弧形構(gòu)造帶的雙鋪-馬家灘沖斷體的香山-天景山?jīng)_斷席,主要構(gòu)造活動(dòng)為加里東期期、印支期、燕山期和喜馬拉雅期。早期的構(gòu)造活動(dòng)為本區(qū)銅礦沉積奠定了基礎(chǔ)。在對(duì)峽子溝礦床進(jìn)行詳細(xì)的野外調(diào)研、室內(nèi)測(cè)試和綜合分析的基礎(chǔ)上,剖析了其成礦地質(zhì)特征、礦床成因和成礦條件,厘定了找礦標(biāo)志。取得了以下成果:1.研究區(qū)銅礦化賦存地層為泥盆系老君上組下段,圈定一個(gè)礦體,其含礦巖性為淺紫紅色石英礫巖;頂板為灰-淺灰色石英砂巖,底板為紫紅色泥巖。礦體沿走向延伸509m,傾向延伸443m,平均厚度1.24m;礦體走向160°-180°,礦體傾向呈南西,礦體傾角10°-21°;呈似層狀。2.礦石自然類型為空隙式填充及裂隙式填充。礦石礦物為孔雀石、藍(lán)輝銅礦、輝銅礦、黝銅礦、銅藍(lán)�？兹甘倪呅渭安灰�(guī)則粒狀,星散狀及浸染狀分布于石英間隙,或裂隙充填呈脈狀。黝銅礦呈星散狀、浸染狀不均勻分布于巖石中,或呈斷續(xù)脈狀、網(wǎng)脈狀裂隙充填。以裂隙充填為主。3.峽子溝銅礦區(qū)的找礦標(biāo)志有:地層標(biāo)志—銅礦賦存于泥盆系上統(tǒng)紅色巖層與淺色巖層的變化地層;巖性標(biāo)志—泥盆系老君組下段中下部沉積的淺色礫巖、砂巖夾層是礦區(qū)的巖性找礦標(biāo)志;礦化標(biāo)志—孔雀石化礦化是礦區(qū)的直接找礦標(biāo)志;環(huán)境標(biāo)志—晚古生代山澗河湖相沉積場(chǎng)所為理想的找礦標(biāo)志和結(jié)構(gòu)構(gòu)造—內(nèi)部孔隙、節(jié)理和裂隙發(fā)育愈強(qiáng)烈,則礦化較好,可以作為間接找礦標(biāo)志。4.峽子溝銅礦經(jīng)歷同生沉積和后期淋濾富集兩個(gè)階段過程。
[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 擄-180 擄, the orebody inclines to the south west, the orebody inclination angle is 10 擄-21 擄; 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.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.41

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