本文選題：螢石礦床地質(zhì)特征 + 物探與化探　； 參考：《成都理工大學》2017年碩士論文

【摘要】：內(nèi)蒙古烏力吉敖包螢石研究區(qū)地處內(nèi)蒙吉林成礦帶,位于西伯利亞板塊和華北板塊碰撞縫合處,曾經(jīng)歷多期構造運動及巖漿旋回。區(qū)域上,巖漿巖分布面積廣,曾發(fā)生活躍的構造運動,這為形成螢石礦床提供了良好條件。研究區(qū)第四系覆蓋嚴重,想進一步探明地下螢石礦床分布情況,則必須利用多種勘探技術的探測與實地探槽(鉆探)工程的驗證。通過對前人資料的整理、研究區(qū)的實地踏勘與采樣分析,總結出了研究區(qū)螢石礦床地質(zhì)特征、圍巖蝕變、礦石特征以及初步劃分了成礦期次。該區(qū)螢石礦屬于淺成低溫熱液礦床,礦體以脈狀為主,少量為透鏡狀;礦體垂向上呈規(guī)律變化,即硅質(zhì)頂殼、礦體和凝灰?guī)r。由于受火山巖的影響,礦體邊部圍巖依次從內(nèi)外往外出現(xiàn)了硅化、絹云母化;在垂向上依次從上往下出現(xiàn)絹云母化、硅化、高嶺石化、螢石礦化、碳酸鹽化及黃鐵礦化。研究區(qū)礦石為單一螢石,主要為角礫狀構造和塊狀構造,以自形粒狀結構和自形—半自形粒狀結構為主。根據(jù)礦石的穿插關系初步劃分為四個成礦階段:黃鐵階段、螢石—石英階段、石英—螢石階段和碳酸鹽—螢石階段,其中以螢石—石英階段和石英—螢石階段為螢石主要形成期。經(jīng)過相關資料的查閱與實驗室研究,總結了研究區(qū)成礦地質(zhì)條件。燕山中晚期,研究區(qū)受到NE向查干敖包—五叉溝深斷裂(F7)影響,并經(jīng)過多期構造改造,研究區(qū)形成眾多NS向的次級構造,這為成礦提供容礦構造、導礦構造和配礦構造;伴隨巖漿的活動,白音高老組(K1b)凝灰?guī)r為成礦提供必要的溫度與成礦物質(zhì),而經(jīng)過實驗室包裹體研究測溫壓表明,該螢石礦床形成溫度約108~340℃,成礦平均深度為390m。本文通過地質(zhì)學、地球物理學與地球化學技術方法有機結合,并采用甚低頻電磁法與X熒光儀測量方法,測量出了研究區(qū)的異常區(qū)域,并進一步對研究區(qū)內(nèi)具有成礦潛力的區(qū)域進行圈定。依據(jù)以上方法分析,該區(qū)圈定了4個成礦預測靶區(qū)。1號成礦遠景區(qū)劃分依據(jù):地處有絹云母蝕變的正地貌,甚低頻F值異常圖中正高異常明顯,Ca異常圖中Ca高異常特別明顯,實地采取地表探槽驗證,劃分為B類靶區(qū);2號成礦遠景區(qū)劃分依據(jù):處于正地貌,附近出露小面積巖石并伴有螢石礦化,甚低頻F值異常圖出現(xiàn)“雙峰”正高異常,Ca異常圖中Ca出現(xiàn)高異常,平洞勘探發(fā)現(xiàn)螢石礦床點,劃分為A類靶區(qū);3號成礦遠景區(qū)劃分依據(jù):地貌上處于山腰,甚低頻F值異常圖出現(xiàn)正高異常,Ca異常圖出現(xiàn)高異常,表明該區(qū)具有較高的勘探潛力,劃分為C類靶區(qū);4號成礦遠景區(qū)劃分依據(jù):處于出現(xiàn)少量螢石礦化的正地貌,在甚低頻F值異常圖局部出現(xiàn)“雙峰”異常,并得到了地表探槽的驗證,劃分為B類靶區(qū)。
[Abstract]:The study area of Aobao fluorite in Inner Mongolia is located in the Jilin metallogenic belt of Inner Mongolia, located at the collision and suture of the Siberian plate and the North China plate, and has experienced multiple tectonic movements and magmatic cycles. In the region, magmatic rocks are widely distributed and active tectonic movements have taken place, which provide favorable conditions for the formation of fluorite deposits. The Quaternary system covers heavily in the study area. In order to further investigate the distribution of underground fluorite deposits, it is necessary to make use of various exploration techniques and verification of field exploration trough (drilling) projects. The geological characteristics of fluorite deposits, wall rock alteration, ore characteristics and metallogenic stages of fluorite deposits in the study area are summarized through the collation of previous data, field exploration and sampling analysis in the study area. The fluorite deposit in this area belongs to the epithermal hydrothermal deposit, the orebody is mainly vein-like and a few is lenticular, and the orebody changes in vertical direction, I. E. siliceous top crust, orebody and tuff. Due to the influence of volcanic rock, the surrounding rock of the ore body appears silicification and sericite from inside and outside, sericite from top to bottom, kaolinization, fluorite mineralization, carbonization and pyrite from vertical to upward. The ore in the study area is a single fluorite, mainly a breccia structure and a block structure. According to the intercalation relationship of ore, it can be divided into four metallogenic stages: Huang Tie stage, fluorite-quartz stage, quartz-fluorite stage and carbonate fluorite stage. The fluorite-quartz stage and quartz-fluorite stage are the main fluorite forming stages. The metallogenic geological conditions of the study area are summarized through the reference of relevant data and laboratory research. In the middle and late Yanshan period, the study area was influenced by the NE direction Chagan Aoba-Wujiagou deep fault (F7), and through the multi-stage structural transformation, many NS secondary structures were formed in the study area, which provided the ore-bearing structure, the ore-conducting structure and the ore-blending structure for metallogenesis. Accompanied by magmatic activity, tuff provides the necessary temperature and ore-forming material for mineralization, and the temperature and pressure measurements of inclusions show that the formation temperature of the fluorite deposit is about 108 ~ 340 鈩，

本文編號：1856156