內(nèi)蒙古額濟(jì)納旗烏珠爾嘎順鐵礦地質(zhì)特征及成因類型
發(fā)布時(shí)間:2018-06-25 來(lái)源: 美文摘抄 點(diǎn)擊:
摘要:額濟(jì)納旗烏珠爾嘎順鐵礦位于中奧陶統(tǒng)咸水湖群火山巖組與石炭紀(jì)二長(zhǎng)花崗巖體的外接觸帶,礦體總體產(chǎn)狀和接觸帶產(chǎn)狀一致,賦存于接觸帶上的石榴石矽卡巖體及其附近二長(zhǎng)花崗巖體中。石炭紀(jì)二長(zhǎng)花崗巖為礦體的形成提供了熱源和物源,北東向的斷裂構(gòu)造為成礦熱液提供了通道。本文是在分析礦床的成礦地質(zhì)特征的基礎(chǔ)上,初步分析了其成因類型。
關(guān)鍵詞:內(nèi)蒙古;額濟(jì)納旗烏珠爾嘎順;地質(zhì)特征;礦床成因
Geological Characteristics and Genetic Type of Wuzhuergashun Iron Deposit in Ejinaqi,Inner Mongolia
He Feng,Su Maorong,Yang Jianjun
Key Laboratory of Magmatic Mineralization and Ore-prospecting,Inner Mongolia Autonomous Region,Geological Survey of Inner Mongolia,Inner Mongolia Autonomous Region,Huhhot 010020,China
Abstract:The Wuzhuergashun iron deposit in Ejinaqi has located the outside contact strip of O2X2 andηγC2. The occurrence of ore body is similar to the occurrence of contact strip. The ore body has come Garnet skarns in contact strip and near monzonitic granite rock.ηγC2 provides the formation of the ore body with heat and source. In addition,The northeast rift tectonic provides a channel of ore-forming hydrothermal. The paper preliminary analysis the genetic types based on the analysis of ore-forming geological characteristics.
Key Words:Inner Mongolia,Wuzhuergashun in Ejinaqi,Geological Characteristics,deposit genesis
引言
烏珠爾嘎順鐵礦位于內(nèi)蒙古自治區(qū)阿拉善盟額濟(jì)納旗賽漢陶來(lái)蘇木,距額濟(jì)納旗政府所在地達(dá)來(lái)呼布鎮(zhèn)105km。地理坐標(biāo):東經(jīng)99°55′40″~99°56′29″,北緯42°17′58″~42°18′29″。本礦床系1979年甘肅省地質(zhì)局地質(zhì)力學(xué)區(qū)調(diào)隊(duì)開(kāi)展六駝山幅(K-47-ⅩⅥ)1∶20萬(wàn)區(qū)域地質(zhì)調(diào)查時(shí)發(fā)現(xiàn),并對(duì)其進(jìn)行了少量探槽工程揭露,填寫(xiě)了礦點(diǎn)檢查卡片。1994年4月,內(nèi)蒙古第一地球物理地球化學(xué)勘查院進(jìn)行了詳查并提交了詳查報(bào)告,圈定了10條礦體,其中3號(hào)礦體規(guī)模最大,約占總儲(chǔ)量的68.6%。
筆者通過(guò)分析烏珠爾嘎順鐵礦的礦區(qū)地質(zhì)特征、礦體特征、礦石特征和圍巖蝕變特征,初步分析了其成因類型。
1.區(qū)域地質(zhì)特征
該礦床處于古亞洲成礦域,準(zhǔn)噶爾成礦省,覺(jué)羅塔格-黑鷹山CuNiFeAuAgMoW石膏成礦帶,黑鷹山-雅干FeAuCuMo成礦亞帶中[1-3]。大地構(gòu)造位置屬天山-興蒙造山系,額濟(jì)納旗-北山弧盆系,園包山巖漿弧[4-6]。出露的區(qū)域賦礦地層為下古生界奧陶系中統(tǒng)咸水湖群(O2X)。區(qū)域巖漿巖主要為石炭紀(jì)侵入巖,巖石類型有石英閃長(zhǎng)巖、斜長(zhǎng)花崗巖、花崗閃長(zhǎng)巖、二長(zhǎng)花崗巖等,巖體均呈巖基或巖株?duì)町a(chǎn)出。其中石炭紀(jì)二長(zhǎng)花崗巖與礦體關(guān)系密切。區(qū)內(nèi)總體構(gòu)造線方向?yàn)楸蔽飨,北西向斷裂?gòu)造控制著地層和巖體的展布方向。
2.礦區(qū)地質(zhì)特征
2.1地層
1. Holocene series of quaternary system;2. The third rock member of volcanics group;3. The second rock member of volcanics group;4. The up-first rock member of volcanics group;5. The down-first rock member of volcanics group;6. Monzonitic granite;7. Plagioclase granite;8. Plagioclase granite dike;9. Granosyenite dike;10. Iron body and number;11. Magnetite mineralization body;12. Boundary of measured or conjectural;13. Reverse fault;14. Strike-slip fault;15. Occurence
2.2構(gòu)造
礦區(qū)處于嘎順布拉格—烏珠爾嘎順沖斷層北側(cè)東端,奧陶系中統(tǒng)咸水湖群火山巖組與二長(zhǎng)花崗巖體接觸帶一線,次一級(jí)擠壓構(gòu)造破碎帶部位。該擠壓構(gòu)造破碎帶呈北東東方向延展,寬50m~70m,是烏珠爾嘎順矽卡巖型鐵礦成礦的控礦構(gòu)造。在其鐵礦體形成之后,又有小的斷層與褶皺產(chǎn)生,對(duì)礦體有一定的破壞。這些小的斷層特點(diǎn)是:走向不一致,有北西向、近南北或近東西向,但其共同的特點(diǎn)均為陡傾斜的平移斷層或沖斷層。礦區(qū)可見(jiàn)明顯的斷層有如下4條:
相關(guān)熱詞搜索:額濟(jì)納旗 內(nèi)蒙古 成因 鐵礦 地質(zhì)
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