本文選題：板石溝 + 鞍山式鐵礦��； 參考：《吉林大學(xué)》2015年碩士論文

【摘要】：板石溝鐵礦位于華北板塊北緣東段，龍崗復(fù)式背斜南翼是中國典型的太古宙變質(zhì)雜巖出露區(qū)，遭受了強(qiáng)烈的變質(zhì)變形作用。板石溝地區(qū)主體構(gòu)造為一倒轉(zhuǎn)復(fù)式向斜構(gòu)造。區(qū)內(nèi)礦產(chǎn)資源豐富，鐵礦主要為鞍山式鐵礦，大中型鐵礦主要分布在太古宙楊家店組中。板石溝地區(qū)是鞍山式鐵礦產(chǎn)出的有利地區(qū)，在板石溝開展鐵礦成礦預(yù)測研究，對于指導(dǎo)板石溝地區(qū)鐵礦勘查部署具有一定的意義。 本文通過野外地質(zhì)踏勘、室內(nèi)分析研究，對本區(qū)鐵礦石及圍巖地球化學(xué)特征、年代學(xué)特征及其構(gòu)造控礦特征進(jìn)行了深入的研究，得出的主要認(rèn)識如下： 板石溝鐵礦礦石類型主要以磁鐵石英巖為主，其次為角閃磁鐵石英巖，鐵礦圍巖主要為中粗粒斜長角閃巖、角閃片巖和黑云斜長片麻巖。磁鐵石英巖與斜長角閃巖類巖石緊密共生，呈厚度不等的透鏡狀、條帶狀斷續(xù)分布在斜長角閃類巖石中。磁鐵礦礦石硅和鐵的氧化物含量平均達(dá)到92.97%，其稀土元素配分曲線與鞍山-本溪磁鐵石英巖的基本一致，呈現(xiàn)出明顯正Eu和Y異常，是經(jīng)過海水和熱液流體混合的化學(xué)沉積物。 板石溝鐵礦賦存于太古宙楊家店組中，嚴(yán)格受層位控制，，該組巖石原巖建造屬中酸性-基性火山沉積建造，鐵礦石為含鐵較高的磁鐵石英巖，具有變質(zhì)巖巖控特征，其強(qiáng)烈的高場強(qiáng)元素Nb、Zr、Hf和Ti負(fù)異常，也說明其成礦作用與火山作用有關(guān)。 與板石溝鐵礦石密切伴生的斜長角閃巖的鋯石LA-ICP-MS U-Pb加權(quán)平均年齡為2548±11Ma，代表了板石溝鐵礦的形成時代，這與遼東鞍山鐵礦形成時代一致。 板石溝鐵礦共5個采礦區(qū)，16個礦組，南部16、17、19礦組礦體向北傾，北部7-8、14-15和6等礦組礦體向南傾，這些礦組形成了軸向北西的復(fù)式向形構(gòu)造，其轉(zhuǎn)折端在木通溝地區(qū)。8礦組礦體總體為向南西西傾伏的復(fù)式“向斜”褶皺，由一系列相間排列的次一級背斜和向斜構(gòu)造組成，木通溝礦體總體為北東向展布，向南東傾，傾角在10°~45°之間，該地區(qū)區(qū)含礦層有兩層，一層礦體較薄，另一層礦體發(fā)生褶皺變形，造成局部有多層礦體的假象。 板石溝地區(qū)鐵礦及其圍巖經(jīng)歷了三期變質(zhì)變形改造：第一期是早期順層伸展滑移變形作用，這一期變形使木通溝礦體形成了較寬緩的順層滑移褶皺；第二期是以第一期褶皺構(gòu)造面為變形面，受到北北西-南南東向擠壓作用，形成了北東東向較為寬厚的板石溝復(fù)式向斜褶皺-板石溝主體構(gòu)造形態(tài)；第三期是在第二期主構(gòu)造輪廓上，局部受到北西-南東向擠壓作用，使第二期構(gòu)造面局部變形，將礦體局部改造為近南北向。 板石溝鐵礦主要賦存于褶皺構(gòu)造的核部，核部礦體厚度較大，翼部較薄或沒有礦體，根據(jù)板石溝地區(qū)構(gòu)造變形特征和航磁異常特征，選定了8礦組斷裂下部、木通溝北東側(cè)深部、17礦組南部和北東部區(qū)域作為本區(qū)礦產(chǎn)勘查的重要遠(yuǎn)景區(qū)。 今后的找礦方向：褶皺變形構(gòu)造的核部，航磁異常與向形構(gòu)造相吻合的低緩磁異常區(qū)找盲礦體。
[Abstract]:It is located in the eastern part of the northern margin of the North China plate. The southern wing of the Longgang compound anticline is a typical Archean metamorphic complex Iwade area in China, which has suffered a strong metamorphic and deformed effect. The main structure of the area is a reverse complex syncline structure. The mineral resources in the area are rich in mineral resources, the main iron ore is Anshan type iron ore, and the large and medium size iron ore distribution is mainly distributed. In the Archean Yangjia group, the area of the Sinkou area is a favorable area for the production of Anshan type iron ore, and it is of great significance to carry out the study on the metallogenic prognosis of the iron ore in the slate gully, which is of certain significance for guiding the exploration and deployment of the iron ore in the area of the plate.
In this paper, the geochemical characteristics of iron ore and surrounding rock in this area, the characteristics of the geochronology and the characteristics of its ore control are deeply studied through the field geological survey and the indoor analysis. The main understanding is as follows:
The main ore types of the banshiggou iron ore are mainly magnetite quartzite, followed by hornblende magnetite quartzite. The iron ore is mainly medium coarse amphibolite, hornblende and black cloud slanted gneiss. Magnetite quartzite is closely associated with diagonal amphibolite, with a lens like thickness of different thickness. The strip is distributed intermittently in the diagonal amphibolite. In the stone, the content of silicon and iron oxide in magnetite ore is up to 92.97%, and the distribution curve of rare earth elements is basically the same as that of Anshan Benxi magnetite quartzite, showing obvious positive Eu and Y anomalies, which are chemical sediments mixed by sea water and hydrothermal fluids.
The bsigou iron ore deposit occurs in the Archean Yangjia group and is strictly controlled by the layers. The rock formation of the rock formation belongs to the medium acidic basic volcanic deposit, and the iron ore is a high iron bearing magnetite quartzite, which has the characteristics of metamorphic rock control, and its strong high field and strong elements Nb, Zr, Hf and Ti are negative. It also indicates that the mineralization is related to the volcanism.
The zircon LA-ICP-MS U-Pb weighted average age of the diagonal amphibolite, which is closely associated with the beitangou iron ore, is 2548 + 11Ma, representing the age of the formation of the beitangou iron ore, which is in accordance with the age of the formation of Anshan iron ore in Liaodong.
The bshitu iron mine has 5 mining areas, 16 mine groups, the southern 16,17,19 ore body is tilting northward, and the northern 7-8,14-15 and 6 ore bodies are inclined to the south. These ore formations form the compound axis of the axis to the North West, and the turning end is in the.8 mine of the Mu Tong gully area as a general compound "syncline" fold to the South West West. The second grade anticline and syncline structure of the column is composed of the north east direction and the South East, and the dip angle is between 10 degrees ~45 degrees. The area contains two layers, the one layer is thinner and the other ore body folds and deformation, resulting in the false image of the local multi layer orebody.
The iron ore and its surrounding rock in the area of the satiigou area have undergone three stages of metamorphism and deformation: the first stage was the early bedding extension and slip deformation, which resulted in the formation of a wider and slower bedding slip folds in the maitaitu orebody, and the second stage was the first stage of the fold tectonic surface as the deformation surface, and the North North West South to South East compression was formed, and the North was formed north. East east to the more broad swell trench complex syncline fold - Slate main structure form; the third phase is on the second phase of the main tectonic outline, locally subjected to the north-west - southward extrusion, the second phase of the tectonic surface, local transformation of the ore body to the near North and south direction.
The iron ore body of the plate is mainly located in the nuclear part of the fold structure, the thickness of the core ore body is large, the wing is thin or there is no ore body. According to the characteristics of structural deformation and aeromagnetic anomaly in the area of the area of the plate, the lower part of the 8 mine is selected, the deep part of the north east side of the komitaitu, the southern part of the 17 ore group and the North East region are the important prospective areas of the mineral exploration in this area.
In the future, the direction of prospecting is: the core part of the folded deformation structure, the aeromagnetic anomaly and the low magnetic anomaly area which are consistent with the oriented structure.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.31

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