本文選題：地球化學(xué) + 地球物理�。� 參考：《吉林大學(xué)》2015年碩士論文

【摘要】：研究區(qū)地處大興安嶺南麓,興蒙造山帶東段,位于興安地塊,東與松嫩地塊接壤,西與額爾古納地塊接壤,經(jīng)歷了古亞洲洋構(gòu)造域和古太平洋構(gòu)造域兩大演化階段,以及西伯利亞板塊和中朝板塊間若干塊體之間復(fù)雜的拼貼、演化歷史。東烏珠穆沁旗復(fù)背斜的柴河源林場(chǎng)位于中生代斷陷邊緣,即東烏珠穆沁旗早華力西造山帶上。區(qū)內(nèi)地質(zhì)構(gòu)造復(fù)雜、火山作用和巖漿活動(dòng)均較頻繁。通過(guò)對(duì)研究區(qū)內(nèi)地質(zhì)、物化探信息及區(qū)域所處成礦帶、典型礦床等成礦信息的綜合研究,系統(tǒng)總結(jié)找礦信息的基礎(chǔ)上,對(duì)研究區(qū)可能存在隱伏熱液脈型鉛鋅多金屬礦化體開展了成礦靶區(qū)預(yù)測(cè)。取得的認(rèn)識(shí)如下:1、研究區(qū)處在東烏珠穆沁旗復(fù)背斜兩個(gè)三級(jí)構(gòu)造單元及其交接部位西部,該交接部位即為一深大斷裂,成礦帶內(nèi)多金屬成礦遠(yuǎn)景區(qū)即分布于此。通過(guò)對(duì)研究區(qū)高精度磁法測(cè)量,推測(cè)A區(qū)范圍內(nèi)存在北東向斷裂構(gòu)造及多條北西向次及斷裂構(gòu)造。結(jié)合成礦帶內(nèi)典型礦床資料,認(rèn)為礦床類型為火山熱液脈型,并受斷裂構(gòu)造的影響。2、研究區(qū)地質(zhì)、化探工作揭示,在侵入巖(三疊世堿性花崗巖、侏羅世鈉長(zhǎng)斑巖)與多寶山組地層接觸部位,元素異常顯著,組合異常好,巖石礦化蝕變強(qiáng)烈,是找礦工作的重點(diǎn)地段,且角巖化多寶山組巖石可以作為巖漿熱液活動(dòng)的標(biāo)志之一。3、研究區(qū)Pb、Zn、Mo、Ag、C u元素變異數(shù)均較大,元素在不同地質(zhì)體中分配相對(duì)不均勻,容易局部富集,為多金屬礦的形成奠定了物質(zhì)基礎(chǔ),Bi、Sn、As、W、Au元素變異數(shù)較小,不易富集成礦。4、通過(guò)土壤測(cè)量數(shù)據(jù)R型因子分析可知,區(qū)內(nèi)主成礦元素為Pb、Zn、Mo、Ag、Cu,土壤地球化學(xué)測(cè)量與激電異常結(jié)果顯示,優(yōu)秀土壤組合異常與中-高極化率異常、低電阻率疊加部位對(duì)找礦有很好的指導(dǎo)意義。5、在總結(jié)研究區(qū)的成礦模式與控礦條件基礎(chǔ)上,認(rèn)為研究區(qū)深部存在一定規(guī)模的鉛鋅多金屬礦體。根據(jù)區(qū)內(nèi)成礦預(yù)測(cè)標(biāo)志,在研究區(qū)內(nèi)圈定出3處成礦靶區(qū)(I級(jí)成礦靶區(qū)1處,II級(jí)成礦靶區(qū)2處)。其中,I甲級(jí)成礦靶區(qū)(A區(qū))是區(qū)內(nèi)最重要,最有成礦潛力的靶區(qū)。6、A區(qū)的工程驗(yàn)證,取得了不錯(cuò)的成果:地表槽探圈定出長(zhǎng)約200m、寬約50m的鉛鋅多金屬礦化帶;深部鉆探工程圈出鉛鋅多金屬礦化體共計(jì)21條(鉛、鋅、鉬、銅礦化體19條,金礦化體2條)。礦化集中發(fā)育在巖體與多寶山組地層接觸帶,巖石發(fā)育有碎裂巖化、隱爆角礫巖化,證明了研究區(qū)成礦靶區(qū)預(yù)測(cè)的正確性與可行性。整體上來(lái)看,研究區(qū)內(nèi)成礦條件非常好,繼續(xù)投入工作有望找到一定規(guī)模的鉛鋅多金屬礦床。區(qū)內(nèi)構(gòu)造較為發(fā)育的區(qū)段,鉛鋅等多金屬元素含量較為突出;元素異常高值受構(gòu)造影響明顯,與侏羅世鈉長(zhǎng)斑巖關(guān)系最為緊密。已發(fā)現(xiàn)礦(化)體多在鈉長(zhǎng)斑巖體及接觸帶附近,鈉長(zhǎng)斑巖受到震碎(隱爆)及熱液疊加形成礦物質(zhì)沉淀,形成礦(化)體。鈉長(zhǎng)斑巖為研究區(qū)內(nèi)最主要的成礦母巖,也是研究區(qū)最為主要的找礦標(biāo)志。
[Abstract]:The study area is located at the southern foot of the Daxing'an Mountains, the eastern section of the Xingmeng orogenic belt, the Xingan block, the Songnen block in the east and the Erguna block in the west. The study area has undergone two major stages of evolution: the Paleo-Asian Ocean tectonic domain and the Paleo-Pacific tectonic domain. And the complex collage and evolution history of several blocks between Siberia plate and Sino-Korean plate. The Chaiheyuan Forest Farm of East Wuzhumuqin Banner complex anticline is located on the edge of Mesozoic fault depression, that is, on the early Huaxi orogenic belt of East Wudhumuqin Banner. The geological structure in the area is complex, with frequent volcanism and magmatic activity. Based on the comprehensive study of geological, geophysical and geochemical exploration information and metallogenic information of the region, such as metallogenic belts and typical deposits, the paper systematically summarizes the ore-prospecting information. The metallogenic targets of the latent hydrothermal vein type lead-zinc polymetallic mineralization bodies in the study area were predicted. The understanding obtained is as follows: the study area is located in the west of the two tertiary structural units and their joint sites in the East Wudhumuqin Banner complex anticline, which is a deep fault, in which the polymetallic metallogenic distant spot is located in the metallogenic belt. Based on the high-precision magnetic survey in the study area, it is inferred that there are NE-trending fault structures, several NW-substructures and fault structures in the A area. Combined with the data of typical ore deposits in the metallogenic belt, it is considered that the deposit type is volcanic hydrothermal vein type and affected by fault structure. The geological and geochemical work in the study area reveals that the ore deposit type in the intrusive rocks (Triassic alkaline granites), Jurassic sodium porphyry) and Dobaoshan formation strata contact site, the element anomaly is remarkable, the association is abnormal, the rock mineralization alteration is strong, is the prospecting work key area, Moreover, the rocks of the hornstone Dobaoshan formation can be used as one of the indicators of magmatic hydrothermal activity. In the study area, the variances of element PBZZZMoAg-AgCu are large, and the distribution of elements in different geological bodies is relatively uneven, and it is easy to enrich locally. It lays a material foundation for the formation of polymetallic ore. The variation number of the elements is small and it is not easy to enrich the ore-forming elements. Through the analysis of R-type factors of soil survey data, it can be seen that the main metallogenic element in the area is PbZnZn-MoMo-AgAg-Cu.The results of soil geochemistry survey and induced electric anomaly show that the main ore-forming element in the area is PbZnZn-Mo-Ag-Cu. The excellent soil assemblage anomaly and medium-high polarizability anomaly, and the superposition of low resistivity have good guiding significance for ore prospecting. On the basis of summarizing the metallogenic model and ore-controlling conditions in the study area, It is considered that there is a certain scale of lead-zinc polymetallic ore bodies in the deep part of the study area. According to the metallogenic prediction criteria in the study area, three metallogenic target areas of grade I and I have been delineated in the study area, and one and two areas of grade II metallogenic target have been identified in the study area. It is the most important and the most potential target area in this area. The engineering verification of the target area. 6A area has obtained good results: the plumb-zinc polymetallic mineralization belt about 200m long and 50m wide has been delineated by the surface trough exploration, and the results are as follows: (1) the plumb-zinc polymetallic mineralization zone with the length of 200m and the width of 50m is determined by the surface trough exploration. A total of 21 Pb-Zn polymetallic mineralization bodies (19 lead, zinc, molybdenum, copper mineralization bodies and 2 gold mineralization bodies) have been formed in deep drilling engineering. The mineralization is concentrated in the contact zone between the rock body and the Dobaoshan formation, and there are cataclastic rocks and crypto-explosive breccia, which proves the correctness and feasibility of the prediction of ore-forming target in the study area. On the whole, the metallogenic conditions in the study area are very good, and it is expected to find a certain scale of lead and zinc polymetallic deposits. The contents of polymetallic elements such as lead and zinc are more prominent in the areas where the structure is relatively developed, and the high value of element anomalies is obviously influenced by the structure, which is most closely related to the Jurassic sodium porphyry. It has been found that the ore-forming bodies are mostly located near the sodium-porphyry and its contact zone. The Na _ (2 +) porphyry is crushed (imploded) and superimposed by hydrothermal to form mineral deposits and form ore-forming (metamorphic) bodies. Sodium porphyry is the most important ore-forming parent rock and the most important prospecting marker in the study area.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.2

【參考文獻(xiàn)】

相關(guān)期刊論文 前6條

1 賈盼盼;魏俊浩;鞏慶偉;趙萬(wàn)莉;;大興安嶺地區(qū)銅鉬礦床成礦區(qū)帶背景及找礦前景分析[J];地質(zhì)與勘探;2011年02期

2 茍軍;孫德有;趙忠華;任云生;張學(xué)元;付長(zhǎng)亮;王晰;魏紅艷;;滿洲里南部白音高老組流紋巖鋯石U-Pb定年及巖石成因[J];巖石學(xué)報(bào);2010年01期

3 吳福元,孫德有,林強(qiáng);東北地區(qū)顯生宙花崗巖的成因與地殼增生[J];巖石學(xué)報(bào);1999年02期

4 李雙林,歐陽(yáng)自遠(yuǎn);興蒙造山帶及鄰區(qū)的構(gòu)造格局與構(gòu)造演化[J];海洋地質(zhì)與第四紀(jì)地質(zhì);1998年03期

5 陳毓川;礦床的成礦系列[J];地學(xué)前緣;1994年03期

6 程裕淇,陳毓川,趙一鳴,宋天銳;再論礦床的成礦系列問(wèn)題[J];中國(guó)地質(zhì)科學(xué)院院報(bào);1983年02期

，

本文編號(hào)：1860739