本文選題：海子山 + 水系沉積物�。� 參考：《成都理工大學(xué)》2017年碩士論文

【摘要】：研究區(qū)位于西南三江成礦帶之義敦島弧褶皺帶中南段,在研究工作開展之前,先大量且完整地收集前人的研究資料,閱讀大量有關(guān)文獻(xiàn),把現(xiàn)有的研究成果以及地質(zhì)資料有機(jī)的融合分析,通過開展海子山地區(qū)1比5萬水系沉積物測量工作,以鈾釷地球化學(xué)行為特征為切入點(diǎn),探討了研究區(qū)鈾釷元素的分布特征以及分配特征,結(jié)合區(qū)域巖體地球化學(xué)特征以及構(gòu)造、地層特征,對(duì)研究區(qū)U、Th異常物源區(qū)進(jìn)行了分析,再結(jié)合前人的成礦理論及地質(zhì)背景,圈定了U、Th成礦遠(yuǎn)景區(qū),據(jù)此對(duì)研究區(qū)內(nèi)的成礦遠(yuǎn)景分析進(jìn)行了分析,為研究區(qū)地質(zhì)礦產(chǎn)勘查的進(jìn)一步研究提供一定的理論與現(xiàn)實(shí)依據(jù)。通過水系沉積物測量共圈定單元素異常10處,其中U元素7處、Th元素3處。對(duì)研究區(qū)鈾釷元素的異常分布進(jìn)行分析,結(jié)果顯示,受區(qū)內(nèi)巨大花崗巖體的影響較為明顯,在地層與花崗巖體的接觸帶附近,分布著鈾釷元素的主要異常。根據(jù)U、Th地球化學(xué)性質(zhì),結(jié)合地形地貌以及地質(zhì)背景,分析了U、Th的地球化學(xué)行為特征,結(jié)果表明,研究區(qū)水系沉積物U、Th含量自絨依措花崗巖體以及格聶哈嘎拉花崗巖體向外圍海拔低的區(qū)域逐漸降低,U/Th比值基本同步變化。研究了U、Th地球化學(xué)異常的源區(qū)。利用巖石的U、Th比值來從定量的角度厘定巖石現(xiàn)測鈾含量(U)和原始鈾含量(Uo),通過計(jì)算得出,研究區(qū)絨依措巖石的近代鈾變化系數(shù)(△U),結(jié)果表明:絨依措花崗巖的原始鈾含量是相對(duì)較高,為3.36×10-6~14.03×10-6,平均為9.81×10-6。此外,△U變化也較大(-25.89%~-42.35%),但主要表現(xiàn)為近代鈾被帶走,這兩者能夠充分證明絨依措花崗巖體為海子山地區(qū)水系沉積物的U異常提供了活性鈾源。對(duì)研究區(qū)鈾釷元素的富集系數(shù)、濃集系數(shù)以及變異系數(shù)的特征進(jìn)行了一系列的統(tǒng)計(jì)分析。結(jié)果顯示,鈾釷元素的含量背景值在本區(qū)內(nèi)很高,且富集性和分異性都很強(qiáng),故研究區(qū)具較大的成礦潛力,其中,就濃集和分異特征而論,鈾元素表現(xiàn)尤為突出。綜合分析研究區(qū)的地質(zhì)背景以及已查明的礦種,最終推測本區(qū)找礦前景相對(duì)較好的為鈾礦床,其中花崗巖型鈾礦床為主要找礦對(duì)象。分析了地質(zhì)單元含礦性。結(jié)果顯示,測區(qū)含礦性較好的地質(zhì)單元為三疊系圖姆溝組和燕山晚期第一階段侵入巖巖體范圍,現(xiàn)有的礦點(diǎn)和礦化點(diǎn)均分布在三疊系圖姆溝組范圍內(nèi),反映了燕山晚期第一階段侵入巖巖漿熱液作用,并最終在三疊系圖姆溝組的富集成礦,指示了本區(qū)的成礦作用的時(shí)代性和層控性。在上述研究的基礎(chǔ)上對(duì)本區(qū)的成礦遠(yuǎn)景進(jìn)行了評(píng)價(jià),劃分出2個(gè)找礦靶區(qū),B級(jí)1個(gè),C級(jí)1個(gè)。自南至北大致劃分兩個(gè)成礦遠(yuǎn)景區(qū),分別為鄂納-赤格U、Th找礦遠(yuǎn)景區(qū)和瓊達(dá)-海子山U、Th等找礦遠(yuǎn)景區(qū),為以后的找礦工作提供了較為詳實(shí)的信息。
[Abstract]:The research area is located in the middle and south section of the Yidong Island Arc fold belt in the Sanjiang metallogenic belt in southwest China. Before the research work was carried out, a large number of previous research materials were collected and a large number of related documents were read. Based on the existing research results and the organic fusion analysis of geological data, by carrying out 1: 50, 000 river system sediment survey in the Haizishan area, the geochemical behavior characteristics of uranium and thorium are taken as the breakthrough point. The distribution and distribution characteristics of uranium and thorium elements in the study area are discussed. In combination with the geochemical characteristics of the regional rock mass and the structural and stratigraphic characteristics, the source area of the Uttrium anomaly in the study area is analyzed, and then the metallogenic theory and geological background of the predecessors are combined. The metallogenic prospect of the study area is analyzed, which provides a theoretical and practical basis for the further study of geological and mineral exploration in the study area. In this paper, 10 anomalies of common order elements were measured by water system sediment, of which 7 were U elements and 3 were Th elements. The anomalous distribution of uranium and thorium elements in the study area is analyzed. The results show that the influence of granitic bodies is obvious, and the main anomalies of uranium and thorium elements are distributed near the contact zone between strata and granite bodies. According to the geochemical properties of Uth, combined with topographic and geomorphological and geological background, the geochemical behavior characteristics of Uth are analyzed. The results show that, In the study area, the UU / Th content in the sediments of the river system gradually decreased synchronously from the low elevation area of the Rongyicuo granite body and the Gniehagala granite body to the peripheral area. The source region of the Th geochemical anomaly is studied. Using the UT ratio of rock to determine the present measured uranium content (U) and the original uranium content of the rock from a quantitative point of view, it is found that, In the study area, the recent uranium variation coefficient (UT) of the Ruiyicuo rock shows that the original uranium content of the Rongyicuo granite is relatively high, which is 3.36 脳 10-6 (14.03 脳 10-6), with an average of 9.81 脳 10-6. In addition, the U variation is also larger, but mainly because the uranium is taken away in modern times, both of which can fully prove that the Rongyicuo granite provides a source of active uranium for the U anomaly in the sediments of the Haizishan area. The characteristics of enrichment coefficient, concentration coefficient and variation coefficient of uranium and thorium elements in the study area were analyzed. The results show that the background value of uranium and thorium content is very high in this area, and the enrichment and heterogeneity are very strong. Therefore, the study area has great metallogenic potential, especially in terms of concentration and differentiation characteristics. Based on the comprehensive analysis of the geological background and the known ore species in the study area, it is concluded that the uranium deposit in this area has a relatively good prospect, among which the granite-type uranium deposit is the main prospecting object. The ore-bearing properties of geological units are analyzed. The results show that the geological units with good ore-bearing property are the Tumgou formation of Triassic and the intrusive rock mass of the first stage of late Yanshanian. The existing ore points and mineralization points are distributed in the range of Tumgou formation of Triassic system. It reflects the magmatic hydrothermal process of intrusive rocks in the first stage of the late Yanshanian and finally enriched and metallogenic in the Triassic Tumgou formation indicating the epoch and stratification of mineralization in this area. On the basis of the above research, the metallogenic prospect of this area is evaluated, and two prospecting target areas are divided into B class and C class. From the south to the north, there are two ore forming scenic spots, one is Ena-Chige UTh Prospecting area, the other is Jongda-Haizi Mountain UTh Prospecting area, which provides more detailed information for the future ore prospecting work.
【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】：2017
【分類號(hào)】：P619.1;P632.3

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