本文選題：玢巖鐵礦 + 礦床地質(zhì)��； 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：和睦山鐵礦床位于寧蕪礦集區(qū)南部鐘姑礦田內(nèi),其主礦體呈似層狀或透鏡狀產(chǎn)于閃長(zhǎng)玢巖巖體與中—上三疊統(tǒng)碳酸鹽巖地層接觸帶及其附近圍巖中,在寧蕪礦集區(qū)具有典型性。作者在前人研究的基礎(chǔ)上,對(duì)和睦山鐵礦床進(jìn)行了野外地質(zhì)調(diào)研和鏡下觀察以及礦物學(xué)和地球化學(xué)分析工作,查明了鐵礦床地質(zhì)特征,分析了成礦作用過程,取得了一些成果和認(rèn)識(shí)。野外調(diào)研和鏡下觀察表明,和睦山鐵礦床礦體主要賦存在閃長(zhǎng)玢巖巖體與中三疊統(tǒng)周沖村組碳酸鹽巖地層接觸帶及其附近圍巖中,其次是在黃馬青組與周沖村組之間的假整合面以及閃長(zhǎng)玢巖巖體中。礦石可分為陽起石—磷灰石—Ⅰ型磁鐵礦和淺閃石—金云母—Ⅱ型磁鐵礦兩種主要類型。淺閃石較陽起石更富Al和Na而貧Si,且Ⅰ型磁鐵礦呈浸染狀,貧Ti和Al而富Mg,而Ⅱ型磁鐵礦呈粗粒脈狀,富Ti和Al而貧Mg,表明淺閃石—金云母—Ⅱ型磁鐵礦階段的成礦溫度高于陽起石—磷灰石—Ⅰ型磁鐵礦階段。和睦山鐵礦蝕變和礦化分帶明顯,從巖體到地層依次為:閃長(zhǎng)玢巖→鈉化閃長(zhǎng)玢巖→金云母—陽起石巖→陽起石—磷灰石—Ⅰ型磁鐵礦礦石→淺閃石—金云母—Ⅱ型磁鐵礦礦石→(電氣石)—淺閃石—金云母(角礫)巖→(陽起石)—金云母巖→大理巖化灰?guī)r-角巖→灰?guī)r-砂頁巖。根據(jù)相互穿插關(guān)系、礦物組合和結(jié)構(gòu)構(gòu)造,將和睦山鐵礦床的形成過程分為成礦前、主成礦和成礦后三個(gè)時(shí)期。成礦前期只有鈉長(zhǎng)石階段,以鈉長(zhǎng)石對(duì)斜長(zhǎng)石的強(qiáng)烈交代為特征。主成礦期可分為陽起石—磷灰石—Ⅰ型磁鐵礦、淺閃石—金云母—Ⅱ型磁鐵礦和赤鐵礦三個(gè)成礦階段。陽起石—磷灰石—Ⅰ型磁鐵礦階段主要形成浸染狀礦石;淺閃石—金云母—Ⅱ型磁鐵礦階段以產(chǎn)出脈狀磁鐵礦礦石為特征。成礦后期可分為石英—黃鐵礦階段和碳酸鹽階段。石英—黃鐵礦階段以大量產(chǎn)出黃鐵礦為特征,石英相對(duì)較少;碳酸鹽階段以晚期方解石對(duì)成礦前期、主成礦期各階段礦物的疊加改造為特征。從論文資料來看,和睦山鐵礦床是玢巖鐵礦系列中的一個(gè)典型的中—高溫氣液交代充填型礦床。陽起石—磷灰石—Ⅰ型浸染狀磁鐵礦礦石是高溫氣液交代作用的產(chǎn)物,而淺閃石—金云母—Ⅱ型粗粒脈狀磁鐵礦礦石是高溫礦液充填作用的產(chǎn)物。
[Abstract]:The Huoshan iron deposit is located in the Zhonggu ore field in the south of Ningwu ore concentration area. Its main orebody occurs in the contact zone between diorite porphyrite rock mass and the middle and upper Triassic carbonate strata and its surrounding rock, which is typical in Ningwu ore accumulation area.On the basis of previous studies, the authors have carried out field geological investigation, microscopic observation and mineralogical and geochemical analysis of the Hushan iron deposit, identified the geological characteristics of the ore deposit, and analyzed the metallogenic process.Some achievements and understandings have been made.Field investigation and microscopic observation show that the orebody of Huoshan iron deposit mainly occurs in the contact zone between diorite porphyrite and carbonate strata of Zhouchong village formation in the middle Triassic and its surrounding rock.The second is the pseudo-integration plane between Huangmaqing formation and Zhouchong village formation and diorite porphyrite.The ore can be divided into two main types: actinolite-apatite-鈪，

本文編號(hào)：1756676