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內(nèi)蒙古東升廟鋅多金屬硫鐵礦床地質(zhì)特征及成因探討

發(fā)布時(shí)間:2018-06-25 來(lái)源: 感恩親情 點(diǎn)擊:

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  摘要:通過(guò)對(duì)內(nèi)蒙古東升廟多金屬硫鐵礦礦床地質(zhì)、地球化學(xué)特征的研究,都清楚表明東升廟多金屬礦床的形成,主要受沉積—構(gòu)造環(huán)境(克拉通邊緣裂谷系、斷陷盆地)、巖相古地理(濱海一瀉湖炭泥質(zhì)碳酸鹽巖相)和中元古代狼山—渣爾泰山同生斷裂構(gòu)造的控制,成礦作用以同生沉積作用為基礎(chǔ),成礦物質(zhì)來(lái)源不是單一的。礦床的成礦作用分兩期:前期為中元古代被動(dòng)陸緣海底噴流沉積作用,后期為后續(xù)造山過(guò)程中巖漿熱液疊加成礦作用,促使成礦物質(zhì)的調(diào)整和重新組合。在東升廟礦床深部的區(qū)域狼山—渣爾泰山多金屬成礦帶,在層狀硫化物原生礦體、多金屬沉積層下部尋找根部礦體。
  關(guān)鍵詞:東升廟礦床;地質(zhì)特征;噴流沉積;巖漿熱液疊加;礦床成因;深部找礦
  A discussion of geologic characteristics and cause Zn-Pb-Sulfur Ore Deposit in DongShengMiao,Inner Mongolia
  ZHAN JingYi
  Inner Mongolia Geochemical Prospecting Institale of Chinda Chemical Geology and Mine Bereau,Hohhot010020,China
  Abstract:The geological and geochemical characteristics of Zn-Pb-Sulfur ore deposit both suggested that there were more than one ore-forming material source in Dong Sheng Miao,Inner Mongolia. The ore deposit depended on sedimentary tectonic environment in Craton marginal rift system and down-faulted basin,lithofacies-paleogeography in BinHai-lithofacies of Carbonaceous carbonate of lagoons and contemporaneous fault structure in Lang MountainChaertai mountain of Mesoproterozoic Era. The mineralization of the ore deposit was based on Syngeneticprecipition,which involved two periods. The earlier period was sedimentary exhalative processes of passive continental margin in Mesoproterozoic Era,while the later was magmatic hydrothermal superimposed during subsequent orogenic process,which made the adjustment and recombined. Therefore,to prospect the root orebody in the deep of Zn-Pb- Sulfursediments,primary orebody of stratiform sulfide,Metallogenic Belt of the Lang mountain-Chaertai mountain in the deep of ore deposit DongShengMiao.
  Key words:DongShengMiao ore deposit,geologic characteristics,sedimentary exhalative processes,magmatic hydrothermal superimposed,ore deposit genesis,deep ore prospecting
  引言
  內(nèi)蒙古烏拉特后旗東升廟多金屬硫鐵礦床是狼山—渣爾泰山多金屬成礦帶內(nèi)最大的銅鉛鋅多金屬硫鐵礦床。1992年前的勘查在東升廟礦區(qū)(43-40勘探線)發(fā)現(xiàn)多層單硫、鋅硫、單鋅和銅鋅硫礦體分布于渣爾泰山群增隆昌組二巖段、阿古魯溝組一、二巖段,圈定主要礦體11個(gè);阿古魯溝組二巖段底部為②號(hào)富鋅硫及富硫礦體,阿古魯溝組一巖段底部為礦區(qū)最大的⑨號(hào)單鋅礦體,增隆昌組二巖段底部為礦區(qū)最大的①號(hào)富硫礦體。前人認(rèn)為其為產(chǎn)于碳酸鹽巖中的海底噴氣沉積型多金屬硫鐵礦床。2005年~2008年在東升廟礦區(qū)40勘探線以東(40-88勘探線)即東升廟礦區(qū)三貴口礦段阿古魯溝組一巖段底部探明一個(gè)厚度大、層位穩(wěn)定的⑨號(hào)單鋅礦體,為東升廟礦區(qū)⑨號(hào)單鋅礦體向東的延伸;批準(zhǔn)儲(chǔ)量達(dá)到超大型鉛鋅礦床規(guī)模,為老礦區(qū)外圍就礦找礦取得突破的典型案例。2010年~2016年對(duì)東升廟礦區(qū)3-40勘探線深部(700m標(biāo)高以下)勘探發(fā)現(xiàn)①號(hào)單硫礦體如盆底賦存在增隆昌組二巖段底部并含有多層單鋅、鋅硫礦體,其下部書(shū)記溝組頂部發(fā)現(xiàn)多層單鋅、鋅硫、單硫礦體,編為??號(hào)礦體;批準(zhǔn)儲(chǔ)量達(dá)到大型鉛鋅礦床規(guī)模,是老礦區(qū)深部就礦找礦取得的突破的典型案例。經(jīng)多年的勘探和儲(chǔ)量核實(shí)對(duì)該礦床有了新的認(rèn)識(shí),本文主要對(duì)該礦床礦體形態(tài)、礦石類(lèi)型、地質(zhì)、地球化學(xué)特征進(jìn)行研究,探討地質(zhì)特征、礦床成因及區(qū)域找礦問(wèn)題。
  1.成礦地質(zhì)背景
  研究區(qū)范圍:東經(jīng)107°02′30″~107°05′37″,北緯41°06′15″~41°07′55″;處于華北地臺(tái)(Ⅰ級(jí))北緣,內(nèi)蒙古地軸西段,狼山—白云鄂博臺(tái)緣凹陷(Ⅱ級(jí)),渣爾泰山—狼山褶皺束(Ⅲ級(jí))。北側(cè)以沃博爾銅格—川井—溫都爾廟斷裂為界與華力西晚期褶皺帶毗鄰,南與山西臺(tái)隆及鄂爾多斯臺(tái)坳相接。礦區(qū)位于渣爾泰山—狼山多金屬成礦帶內(nèi)、成礦地質(zhì)環(huán)境十分有利,與炭窯口多金屬硫鐵礦、甲生盤(pán)硫多金屬礦同處于狼山至渣爾泰山南緣多金屬成礦帶上。該帶內(nèi)若干斷隱盆地?cái)嗬m(xù)分布,盆內(nèi)中元古界渣爾泰群主要形成Zn(Pb)-S-Cu炭泥粉砂—碳酸鹽巖建造,本區(qū)層控硫多金屬礦床均產(chǎn)于該建造類(lèi)型。

相關(guān)熱詞搜索:東升 內(nèi)蒙古 成因 地質(zhì) 探討

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