本文選題：安塞巴區(qū) + 異常評(píng)序　； 參考：《成都理工大學(xué)》2015年碩士論文

【摘要】：厄立特里亞安塞巴區(qū)地處阿拉伯-努比亞地盾以南,努比亞地盾內(nèi),該地盾由新古元代大陸邊緣(公元前870~670兆年)和年輕的洋內(nèi)巖漿弧巖體組成,受東非大裂谷和紅海裂谷的共同作用,該地盾歷經(jīng)了長期而復(fù)雜的地質(zhì)演化過程,具有良好的成礦地質(zhì)和構(gòu)造背景,是厄國典型的多金屬成礦帶。由于受戰(zhàn)亂的影響,使本國的礦業(yè)發(fā)展停止不前,研究區(qū)先前的地質(zhì)工作也很少,主要為一些小比例尺的遙感、物探以及少量的區(qū)域地質(zhì)調(diào)查。研究前期的資料發(fā)現(xiàn)該區(qū)域具有成礦潛力。論文依托于《厄立特里亞安塞巴區(qū)Kerkebet金多金屬礦勘查》項(xiàng)目,在收集與綜合研究前期地質(zhì)資料的基礎(chǔ)上,通過土壤地球化學(xué)調(diào)查,查明了區(qū)內(nèi)土壤元素的含量和空間分布特征,確定了該區(qū)土壤中各元素的異常下限,圈定了單元素及綜合異常。結(jié)合1:5萬地質(zhì)填圖以及前期的地、物、遙資料,圈定找礦遠(yuǎn)景區(qū)并對(duì)其做遠(yuǎn)景分析。綜合研究,取得了以下主要成果和認(rèn)識(shí):1、研究區(qū)出露地層主要為新元古界夏甲群(Harga)地層和納克法群地層(Nakfa),納克法群是主要的含礦地層,在礦區(qū)的東部有該群巖石出露;選區(qū)褶皺和斷裂較發(fā)育,其對(duì)成礦都有利,尤其是在斷裂交匯部位;礦區(qū)出露的巖漿巖主要為基性-酸性巖漿巖,巖體對(duì)成礦作用影響較大;選區(qū)蝕變較強(qiáng),主要蝕變?yōu)楣杌�、絹云母化、高嶺土化、綠泥石、綠簾石化;選區(qū)主要礦產(chǎn)為以鋅銅伴生金的多金屬塊狀硫化物礦產(chǎn)、構(gòu)造熱液型金礦以及構(gòu)造蝕變巖型金礦;2、以研究區(qū)的巖石中元素的平均含量為背景,土壤中Mo、Au、Bi、As、Ag、Sb、Cu、Pb、Zn為顯著富集元素,W、Ni元素為顯著貧乏元素;空間上,Mo、Sb、W、Au、Bi、As的變異系數(shù)大于1,為強(qiáng)分異型元素;Cu、Pb、Zn、Co的變異系數(shù)大于0.7小于1,為分異型元素。3、通過土壤元素的相關(guān)性和聚類統(tǒng)計(jì)分析,土壤元素組要分為兩類:一類為Au-Bi-Sn-Ag-Sb-Cu-Pb-Zn,此類元素可能為塊狀硫化物礦的元素組合,另一類為W-Co-Mo,此類元素可能是花崗巖型或接觸變質(zhì)巖型礦的元素組合;4、通過計(jì)算方法確定了研究區(qū)各元素的背景值和異常下限,圈定了單元素異常,各元素的異常面積和強(qiáng)度都較大。根據(jù)元素組合特征,圈定了9個(gè)土壤地球化學(xué)組合異常,并對(duì)其異常評(píng)序,結(jié)果為Ahs1-Ahs3-Ghs1-Ahs4-Ahs2-Ghs3-Gohs2-Ghs2-Gohs1;最后對(duì)各異常進(jìn)行分類評(píng)價(jià),劃分出1處甲1類異常,1處乙1類異常,3處乙2類異常,3處乙三類異常,1處丙1類異常;5、根據(jù)研究區(qū)土壤地球化學(xué)異常特征,結(jié)合該區(qū)域的遙感、地質(zhì)、物探等相關(guān)地質(zhì)信息,綜合分析在區(qū)內(nèi)圈出了5個(gè)找礦遠(yuǎn)景區(qū),遠(yuǎn)景區(qū)主要成礦元素以鋅銅金多金屬為主;并對(duì)遠(yuǎn)景區(qū)分類和評(píng)價(jià),5個(gè)找礦遠(yuǎn)景區(qū)中劃分出1個(gè)Ⅰ級(jí)成礦遠(yuǎn)景區(qū),3個(gè)Ⅱ級(jí)成礦遠(yuǎn)景區(qū),一個(gè)Ⅲ級(jí)成礦遠(yuǎn)景區(qū)。
[Abstract]:The Anseba District of Eritrea is located south of the Arab-Nubian Shield, within the Nubian Shield, which is composed of the Neoproterozoic continental margin (870b.c. 670 megabytes) and the young intraoceanic magmatic arc rock mass, Due to the interaction of the East African Rift Valley and the Red Sea Rift, the shield has undergone a long and complicated geological evolution process and has a good metallogenic geological and tectonic background, which is a typical polymetallic metallogenic belt in Ecuador. Due to the influence of the war, the development of the mining industry in our country has been stopped, and the previous geological work in the study area has been little, mainly for remote sensing on a small scale, geophysical exploration and a small number of regional geological surveys. The preliminary data show that the area has metallogenic potential. Based on the project of "Kerkebet gold polymetallic ore exploration in Anseba area, Eritrea", based on the early geological data collected and comprehensive studied, the contents and spatial distribution characteristics of soil elements in the area were found out through soil geochemical investigation. The anomalous lower limit of each element in the soil was determined, and the single element and the comprehensive anomaly were delineated. Combined with 1: 50 000 geological mapping and preliminary land, objects, remote data, the prospecting area is delineated and its prospect is analyzed. The main results and understanding of the study are as follows: 1. The exposed strata in the study area are mainly the Neoproterozoic Harga-Hargaformation and the Nagfa formation, which are the main ore-bearing strata, and the rocks of the group are exposed in the east of the mining area. The fold and fault are more developed, which are favorable to metallogenesis, especially in the intersection of faults, the magmatic rocks exposed in the mining area are mainly basic-acid magmatic rocks, which have great influence on mineralization, and the selective alteration is stronger, and the main erosion becomes silicification. Sericite, kaolin, chlorite, green curtain petrifaction; the main minerals in the district are polymetallic massive sulfides with zinc and copper associated gold, The tectonic hydrothermal type gold deposit and the tectonic altered rock type gold deposit No. 2 are based on the average content of the elements in the rocks of the study area, and the significant enrichment element is the element WGN Ni in the soil. In space, the coefficient of variation of Mo-SbSbSbWAU-Au-BiOAs is greater than 1, the coefficient of variation of strong special-shaped element CuPbPbZN is greater than 0.7 < 1, and the coefficient of variation is special-shaped element .3.The correlation and cluster statistical analysis of soil elements are carried out, and the results show that the variation coefficient is higher than 1, and that the coefficient of variation is greater than 0. 7. The soil element group can be divided into two categories: Au-Bi-Sn-Ag-Sb-Cu-Pb-Zn, which may be an element combination of massive sulphide ore, The other is W-Co-Mo, which may be a combination of elements of granite type or contact metamorphic rock type ore. The background value and anomaly lower limit of each element in the study area are determined by calculation method, and the single element anomaly is delineated. The abnormal area and strength of each element are large. According to the characteristics of elemental assemblages, 9 geochemical assemblages of soil were delineated and their anomalies were evaluated. The results were as follows: Ahs1-Ahs3-Ghs1-Ahs4-Ahs2-Ghs3-Gohs2-Ghs2-Gohs2-Gohs1. Finally, the anomalies were classified and evaluated. According to the characteristics of soil geochemical anomalies in the study area, the relevant geological information such as remote sensing, geology, geophysical exploration, etc., are classified into 1 anomaly, 1 anomaly, 3 anomalies, 3 anomalies, 1 anomaly and 1 anomaly. The paper synthetically analyses five ore prospecting distant areas in the area, the main metallogenic elements of which are mainly zinc, copper and gold polymetals, and the classification and evaluation of the remote areas, the five prospecting prospective areas are divided into 1 grade I metallogenic prospect and 3 鈪，

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