本文選題：層序地層 + 錳礦��； 參考：《成都理工大學(xué)》2015年碩士論文

【摘要】：錳礦作為我國(guó)重要戰(zhàn)略性礦產(chǎn)資源,在國(guó)民經(jīng)濟(jì)中占有極其重要的地位。錳是鋼鐵產(chǎn)業(yè)必不可少的原料之一。重慶市錳礦資源,主要分布在秀山和城口地區(qū),隨著兩地資源加工型產(chǎn)業(yè)迅速發(fā)展,錳工業(yè)己成為兩縣經(jīng)濟(jì)發(fā)展的支柱產(chǎn)業(yè)。伴隨著地方經(jīng)濟(jì)的快速發(fā)展,錳礦資源的消耗也逐年遞增,可采資源量不斷減低且老礦山開采能力的逐漸下降,現(xiàn)有的錳礦資源難以滿足市場(chǎng)需求,產(chǎn)需矛盾日漸突出。為滿足地方經(jīng)濟(jì)發(fā)展對(duì)礦產(chǎn)資源的需求,一方面需要提高錳礦深加工程度；另一方面,更重要的是創(chuàng)新錳礦找礦方法、找礦思路,重點(diǎn)加強(qiáng)對(duì)重慶市錳礦成礦條件、控礦規(guī)律的研究,以先進(jìn)的找礦理論指導(dǎo)錳礦勘查工作,尤其是深部錳礦勘查工作。城口地區(qū)陡山沱組的錳礦主要集中在該組上部,層控特點(diǎn)十分明顯,然而對(duì)于該區(qū)錳礦形成至關(guān)重要的沉積因素,尤其是從巖相古地理、沉積建造、構(gòu)造控礦等方面的大比例的深入研究則較少。本文以重慶市城口地區(qū)的典型礦區(qū)為研究對(duì)象,通過踏勘、剖面測(cè)制、巖心觀察、礦洞觀測(cè)等野外地質(zhì)手段,以賦礦層位陡山沱組為研究對(duì)象,并且結(jié)合收集到的剖面資料,重點(diǎn)研究該區(qū)陡山沱組的沉積層序特征、層序劃分及層序地層格架,在此基礎(chǔ)上進(jìn)一步結(jié)合陡山沱組的巖石地球化學(xué)特征探討其對(duì)錳礦的控礦機(jī)制。取得以下認(rèn)識(shí)：1、通過野外露頭層序地層學(xué)的研究可以識(shí)別出四種典型的界面：平行不整合面、暴露面、巖性巖相轉(zhuǎn)換面、地層疊置結(jié)構(gòu)轉(zhuǎn)換面。綜合研究表明,震旦系自下而上可劃分出6個(gè)中期層序,即三級(jí)沉積層序單元,分別記為ZOS0-ZOS5;2個(gè)長(zhǎng)期層序ZSS1、ZSS2。2、由于巖性、構(gòu)造特征等差異,元素地球化學(xué)特征在縱向分布上存在較大變化；輕稀土相對(duì)重稀土在總量上明顯富集,Ce、Eu顯示明顯的負(fù)異常；微量元素結(jié)果指示了該區(qū)陡山沱組總體上一種貧氧一缺氧的環(huán)境,且沉積物形成過程中有熱水的注入。3、當(dāng)海水上升至海平面達(dá)到最大值時(shí),在陡山沱組上部形成了最大海泛期的以磷錳礦層為典型特征的凝縮層,也即賦存在陡山沱中的磷錳礦。雖然城口地區(qū)陡山沱組頂部地層是磷錳礦的賦礦層位,但由于地勢(shì)差異,不同地段含錳層位會(huì)有所差異,有的地區(qū)甚至沒有錳礦層的產(chǎn)出,在空間上自北西向南東有逐漸升高的趨勢(shì)。
[Abstract]:As an important strategic mineral resource in China, manganese ore occupies an extremely important position in the national economy. Manganese is one of the essential raw materials in iron and steel industry. The manganese ore resources in Chongqing are mainly distributed in Xiushan and Chengkou areas. With the rapid development of resources processing industry in both cities, manganese industry has become the pillar industry in the economic development of the two counties. With the rapid development of local economy, the consumption of manganese resources is increasing year by year, the quantity of recoverable resources is decreasing and the mining capacity of old mines is decreasing gradually. The existing manganese resources are difficult to meet the market demand, and the contradiction between production and demand is becoming more and more prominent. In order to meet the demand of local economic development for mineral resources, on the one hand, it is necessary to improve the degree of further processing of manganese ore; on the other hand, it is more important to innovate the prospecting method and train of thought of manganese ore prospecting, with emphasis on strengthening the conditions of manganese mineralization in Chongqing. The study of ore control law guides the exploration of manganese deposits, especially the exploration of deep manganese deposits, with advanced prospecting theory. The manganese deposits of the Doushantuo formation in Chengkou area are mainly concentrated in the upper part of the formation, and the stratigraphic characteristics are very obvious. However, the sedimentary factors that are crucial to the formation of manganese deposits in this area, especially from the lithofacies and paleogeography, are the sedimentary formations. A large proportion of the structural ore-control and other aspects of the in-depth study is less. In this paper, the typical mining area in Chengkou area of Chongqing is taken as the research object. Through the field geological means such as exploration, profiling, core observation and cave observation, the Doushantuo formation of the ore-bearing strata is taken as the research object, and the collected profile data are combined. The sedimentary sequence characteristics, sequence division and sequence stratigraphic framework of the Doushantuo formation in this area are emphatically studied. On this basis, the ore-controlling mechanism of the Doushantuo formation on manganese ore is further discussed in combination with the petrogeochemical characteristics of the Doushantuo formation. By the study of outcrop sequence stratigraphy in the field, four typical interfaces can be identified: parallel unconformity surface, exposed surface, lithologic lithofacies transformation surface and stratified structural transformation surface. The comprehensive study shows that the Sinian system can be divided into six intermediate sequences from the bottom to the top, that is, the third-order sedimentary sequence units, which are described as ZOS 0-ZOS 5, and two long-term sequences, ZSS 1 and ZSS 2.2, due to the differences in lithology and structural characteristics, etc. The geochemical characteristics of elements vary greatly in the longitudinal distribution, the relative heavy rare earths of light rare earth show obvious negative anomalies in the total amount of CEE, and the results of trace elements indicate that the Doushantuo formation in this area is an oxygen-poor and anoxic environment in general. In the process of sediment formation, hot water is injected into the sediment. When the sea level rises to the maximum level, the condensed layer, which is characterized by phosphorus and manganese ore, is formed in the upper part of the Doushantuo formation, that is, the phosphorous manganese deposit in Doushantuo. Although the top stratum of Doushantuo formation in Chengkou area is the ore-bearing horizon of phosphorous manganese deposit, because of the difference of topography, the manganese bearing strata in different areas will be different. From north to west to south to east, there is a rising trend in space.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.32;P539.2

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本文編號(hào)：2071399