本文選題：含錳巖系　切入點(diǎn)：沉積特征　出處：《成都理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：廣西錳礦層位多,類型雜,分布廣,儲量居全國之首。桂西南是其中一個重要的找礦遠(yuǎn)景區(qū),本區(qū)錳礦床主要分布于天等縣、德�？h和靖西縣等地。桂西南地區(qū)錳礦雖具有空間分布不均衡的特點(diǎn),但其含錳層位卻表現(xiàn)出了一定的分布規(guī)律,如上泥盆統(tǒng)特定的含錳層位為五指山組和榴江組,下三疊統(tǒng)含錳礦層位為北泗組。本文依據(jù)對桂西南一帶的扶晚地區(qū)下三疊統(tǒng)含錳巖系野外考察和實(shí)測剖面資料的室內(nèi)詳細(xì)研究,結(jié)合前人的資料,通過沉積相分析、古地理格局分析以及控礦因素與沉積相關(guān)系分析等手段,對本區(qū)含錳巖系的沉積特征進(jìn)行研究。主要工作、認(rèn)識和成果概括如下:1.選取扶晚錳礦區(qū)的四口鉆井巖芯進(jìn)行了現(xiàn)場巖芯磁化率測量試驗,實(shí)測磁化率值5504個,其中錳礦297個,圍巖5207個。分析結(jié)果表明,含錳巖系中礦層磁化率較圍巖磁化率存在明顯異常,通常碳酸錳礦磁化率值比圍巖要高出1-2個數(shù)量級,而圍巖中硅質(zhì)巖和泥質(zhì)巖的磁化率無明顯差異。磁化率可作為野外快速判別含錳巖系的代用指標(biāo)。2.收集區(qū)域地質(zhì)資料,結(jié)合野外實(shí)測地層剖面以及室內(nèi)鏡下薄片鑒定資料,根據(jù)巖石類型及巖石組合、沉積構(gòu)造、古生物門類等特征,進(jìn)行了沉積相分析。查明研究區(qū)含錳巖系主要存在四種沉積環(huán)境,包括局限臺地、開闊臺地、臺地邊緣斜坡和深水臺盆。巖性上局限臺地以白云質(zhì)灰?guī)r或灰質(zhì)白云巖沉積為主,開闊臺地以泥質(zhì)灰?guī)r沉積為主,臺地斜坡以角礫狀灰?guī)r出現(xiàn)為標(biāo)志,深水臺盆主要為硅質(zhì)巖和泥巖的沉積。3.編制了研究區(qū)早三疊世古地理圖,認(rèn)為下三疊統(tǒng)地層主要沉積于臺地相和臺盆相中,次為臺地邊緣相沉積。東西部碳酸鹽巖臺地通過相對狹窄的臺地邊緣逐漸過渡到深水臺盆。4.根據(jù)編制的錳礦床分布圖與巖相古地理圖,發(fā)現(xiàn)桂西南地區(qū)的大型、中型和小型錳礦床主要分布于臺盆相區(qū),僅少數(shù)小型錳礦床位于臺地相區(qū)和臺地邊緣相區(qū)。為了進(jìn)一步研究巖相、地層厚度、成礦要素與錳礦床成因的關(guān)系,以德保縣扶晚錳礦床為研究對象,進(jìn)行控礦因素與沉積相關(guān)系的分析。發(fā)現(xiàn)錳礦分布與北東向沉降中心、斷裂構(gòu)造、火山巖分布走向一致,認(rèn)為錳質(zhì)的來源及定位與海底熱液噴流可能有一定的關(guān)系。
[Abstract]:There are many layers of manganese ore in Guangxi, which are of various types and are widely distributed, and the reserves are the first in the whole country. Southwest Guangxi is one of the most important mineral prospecting areas, and the manganese deposit in this area is mainly distributed in Tianding County. Although manganese deposits in southwestern Guangxi have the characteristics of uneven spatial distribution, the manganese bearing horizon of Debao County and Jingxi County shows a certain distribution law, such as the Wuzhishan formation and the Ewejiang formation in the upper Devonian. The lower Triassic manganese bearing strata are Beisi formation. Based on the laboratory detailed study on the field investigation and the measured profile data of the Lower Triassic manganese bearing rock series in the Fupian area of southwest Guangxi, combined with the previous data, the sedimentary facies are analyzed. Based on the analysis of paleogeographic pattern and the relationship between ore-controlling factors and sedimentary facies, the sedimentary characteristics of manganese bearing rock series in this area are studied. The results are summarized as follows: 1. Four drilling cores in Fuwangmanganite area are selected to measure the magnetic susceptibility of core in situ. The measured magnetic susceptibility is 5504, of which 297 are manganese ores and 5207 are surrounding rocks. The results show that the magnetic susceptibility of the core is 5504, among which 297 are manganese ores and 5207 are surrounding rocks. The magnetic susceptibility of ore bed in manganese bearing rock series is obviously abnormal than that of surrounding rock. Generally, the magnetic susceptibility of manganese carbonate ore is 1-2 orders of magnitude higher than that of surrounding rock. However, there is no obvious difference in magnetic susceptibility between siliceous rock and argillaceous rock in surrounding rock. Magnetic susceptibility can be used as a substitute index for quick identification of manganese-bearing rock series in the field. 2. Regional geological data are collected, combined with field measured stratigraphic profile and sheet identification data under indoor microscope. According to the characteristics of rock types and rock assemblages, sedimentary structures and paleontological families, the sedimentary facies are analyzed. It is found that there are four kinds of sedimentary environments in manganese bearing rock series in the study area, including limited platform, open platform, etc. Platform margin slope and deep water platform basin. The lithologic limitation platform is dominated by dolomite or lime-dolomite deposition, the open platform is dominated by argillaceous limestone, and the platform slope is marked by breccia limestone. Deepwater platform basin is mainly composed of siliceous and mudstone deposits .3.The early Triassic paleogeographic map of the study area is compiled. It is considered that the Lower Triassic strata are mainly deposited in platform facies and platform basin facies. The carbonate platform in the eastern and western parts of China gradually transitioned from the relatively narrow platform margin to the deep-water platform basin .4.According to the compiled manganese deposit distribution map and the lithofacies paleogeography map, the large-scale carbonate platform in southwest Guangxi was found. Medium and small manganese ore deposits are mainly distributed in platform basin facies area, only a few small manganese ore deposits are located in platform facies area and platform marginal facies area. In order to further study the relationship between lithofacies, formation thickness, metallogenic elements and genesis of manganese ore deposit, a few small manganese ore deposits are located in platform facies area and platform margin facies area. The relation between ore controlling factors and sedimentary facies is analyzed with the Fuwangmanganite deposit in Debao County. It is found that the distribution of manganese ore is consistent with that of NNE subsidence center, fault structure and volcanic rock distribution. It is considered that the source and location of manganese may be related to the submarine hydrothermal jet.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.32

【參考文獻(xiàn)】

相關(guān)期刊論文 前8條

1 陳洪德;侯明才;林良彪;鐘怡江;張成弓;隆軻;;不同尺度構(gòu)造—層序巖相古地理研究思路與實(shí)踐[J];沉積學(xué)報;2010年05期

2 汪金榜;;下雷碳酸錳礦床地質(zhì)特征及成因探討[J];地質(zhì)與勘探;1987年08期

3 劉成英;李仕虎;鄧成龍;朱日祥;;揚(yáng)子地塊奧陶系碳酸鹽巖重磁化機(jī)制探討[J];地球物理學(xué)報;2013年02期

4 陳超;牟傳龍;梁薇;徐鵬輝;;川南—黔北地區(qū)晚奧陶世凱迪期早期與凱迪期晚期巖相古地理[J];古地理學(xué)報;2014年05期

5 葉連俊;;中國錳礦的沉積條件[J];科學(xué)通報;1955年11期

6 康學(xué)武;;幾種巖相古地理圖編制方法比較[J];黑龍江科技信息;2013年04期

7 竇立榮;二連盆地邊界斷層的生長模型及其對含油氣系統(tǒng)形成的控制[J];石油勘探與開發(fā);2000年02期

8 蘇相敘;;廣西錳礦資源特點(diǎn)及地質(zhì)工作若干問題探討[J];中國錳業(yè);1985年02期

相關(guān)碩士學(xué)位論文 前1條

1 張超;桂西南地區(qū)上泥盆統(tǒng)含錳巖系沉積特征研究[D];成都理工大學(xué);2013年

，

本文編號：1644344