發(fā)布時(shí)間：2018-05-08 17:01

  本文選題：烏拉山巖群 + 片麻巖　； 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2017年碩士論文

【摘要】：內(nèi)蒙古查汗木胡魯石墨礦位于華北地臺(tái)北緣西段,因受到多期次變質(zhì)作用疊加,使得變質(zhì)巖廣泛發(fā)育。礦區(qū)內(nèi)區(qū)域變質(zhì)巖最為發(fā)育,主要為中太古界烏拉山巖群的淺變質(zhì)巖系,主要包括片巖、片麻巖及大理巖等。本文在充分搜集與分析前人研究結(jié)果的基礎(chǔ)上,通過(guò)分析已有的大比例尺巖性圖和地質(zhì)剖面圖,對(duì)該礦床的石墨礦體空間展布、巖石類型及礦物學(xué)特征做了詳細(xì)的描述和研究。查汗木胡魯石墨礦床共發(fā)現(xiàn)11條礦體,其中9個(gè)露頭礦體,2個(gè)隱伏礦體。野外實(shí)測(cè)發(fā)現(xiàn),石墨礦體賦存于烏拉山巖群的透輝斜長(zhǎng)片麻巖和黑云斜長(zhǎng)片麻巖中,礦體頂?shù)装鍑鷰r主要為蛇紋石化大理巖,為一套典型的變質(zhì)沉積巖組合含礦建造。并且石墨以大鱗片狀分布于脈石礦物顆粒間,具有一定的層理,說(shuō)明石墨礦質(zhì)與地層巖石同時(shí)沉積。而該地區(qū)原始巖性組合為含炭質(zhì)泥質(zhì)粉砂巖、含炭質(zhì)白云質(zhì)灰?guī)r、含炭質(zhì)碳酸鹽巖等(袁見(jiàn)齊等,1979)。再加上后期巖漿侵入,以及鉀化、硅化等混合巖化作用,使得石墨晶體進(jìn)一步增大形成了中粗粒片麻巖型石墨礦。因此,查汗木胡魯石墨礦床具有區(qū)域變質(zhì)型礦床的典型特征。通過(guò)選取無(wú)蝕變的石墨標(biāo)本做了13C同位素分析,根據(jù)分析結(jié)果,利用碳同位素對(duì)比圖進(jìn)行解譯,查汗木胡魯石墨礦石中石墨碳同位素的數(shù)值都在-7.6‰到-9.6‰之間,主要集中分布-9‰左右,平均值為-8.72‰。這與碳酸鹽、金剛石的碳同位素?cái)?shù)值范圍符合,而與生物有機(jī)物的碳同位素范圍相差較大。二者處于截然不同的區(qū)間,說(shuō)明查汗木胡魯石墨礦床的碳質(zhì)來(lái)源主要為無(wú)機(jī)碳。
[Abstract]:Chahanmuhulu graphite deposit in Inner Mongolia is located in the western part of the North China platform, and the metamorphic rocks are widely developed due to the superposition of multiple metamorphic processes. The regional metamorphic rocks are the most developed in the mining area, mainly composed of the shallow metamorphic rocks of the Wulashan Group of the Middle Archean, including schist, gneiss and marble. Based on the full collection and analysis of the previous research results, this paper makes a detailed description and study on the spatial distribution, rock types and mineralogical characteristics of the graphite orebody by analyzing the existing large scale lithologic maps and geological profiles. A total of 11 orebodies were found in Chahan Muhuru graphite deposit, of which 9 outcrops and 2 concealed orebodies. It is found that the graphite orebody is located in the diopside gneiss and the black cloud plagioclase gneiss of the Wulashan rock group. The surrounding rock of the top and bottom plate of the orebody is mainly serpentinized marble, which is a set of typical metamorphic sedimentary rock assemblage ore-bearing formation. Graphite distributes in the shape of large scale between gangue mineral particles and has certain stratification, which indicates that the graphite mineral and stratigraphic rocks are deposited at the same time. The primary lithologic assemblage in this area is carbonaceous argillaceous siltstone, carbonaceous dolomite limestone, carbonaceous carbonate rock and so on (Yuan Jianqi et al. Combined with the late magma intrusion and the mixed lithology such as potassium and silicification, the graphite crystal is further enlarged to form the medium coarse gneiss type graphite ore. Therefore, Chahan Muhuru graphite deposit has the typical characteristics of regional metamorphic deposit. The 13C isotopic analysis of graphite samples without alteration was carried out. According to the results of the analysis, the carbon isotopes of graphite in Cha-han Muhulu graphite ore were interpreted by using the carbon isotope comparative map. The values of graphite carbon isotopes in Cha-han Muhulu graphite ore ranged from -7.6 鈥，

本文編號(hào)：1862244