本文選題：河草坑地區(qū) + 蝕變花崗巖��； 參考：《東華理工大學(xué)》2017年碩士論文

【摘要】：河草坑地區(qū)位于武夷山多金屬成礦帶中段,處于大富足復(fù)式巖體的西部邊緣,該帶同時也是我國一條重要的鈾成礦帶,具有優(yōu)越的鈾成礦地質(zhì)條件。經(jīng)前人勘查找礦,揭露的礦體主要集中在350~50m標(biāo)高段受構(gòu)造斷裂控制、富含多金屬硫化物的“綠色”蝕變花崗巖內(nèi),探明深度不超過300m。分析認(rèn)為,深部還有極大的找礦空間。本文結(jié)合“武夷山成礦帶中段河草坑地區(qū)鈾礦資源調(diào)查評價”項目,以河草坑地區(qū)與鈾礦化密切相關(guān)的“綠色”蝕變花崗巖為研究對象,通過音頻大地電磁測深視電阻率資料解釋,對研究區(qū)深部視電阻率變化特征與鈾礦化關(guān)系進(jìn)行分析,探討河草坑地區(qū)鈾成礦視電阻率異常環(huán)境。筆者首先在已知鈾礦床區(qū)的賦礦部位開展了精細(xì)的音頻大地電磁測深研究,旨在通過與已知勘探剖面對比,探討賦礦區(qū)蝕變花崗巖視電阻率異常特征,研究表明:鈾成礦有利部位(蝕變花崗巖帶)的視電阻率異常變化范圍為500~1000?·m之間。以此為依據(jù),圈定了研究區(qū)各條斷面上蝕變花崗巖的分布范圍。在對全區(qū)所有二維視電阻率斷面反演解釋基礎(chǔ)上,結(jié)合地質(zhì)資料,分別繪制了標(biāo)高100m、0m、-100m、-300m、-500m各深度上的視電阻率平面等值圖。利用不同深度的視電阻率異常平面變化特征和控礦、賦礦構(gòu)造的伸展?fàn)顟B(tài),從整體上分析了蝕變花崗巖在各個深度的平面分布范圍。綜合各測線二維反演剖面圖和各深度視電阻率平面等值圖,依據(jù)鈾成礦視電阻率異常環(huán)境條件,繪制了鈾成礦有利地段三維空間分布圖與蝕變花崗巖厚度分布圖,推斷了花崗巖“綠色”蝕變帶的空間展布,導(dǎo)礦、控礦構(gòu)造伸展?fàn)顟B(tài),并最終在研究區(qū)確定了五處具有找礦潛力的有利地段,為進(jìn)一步鈾礦找礦提供了重要依據(jù)。
[Abstract]:The Hetaokeng area is located in the middle section of the Wuyishan polymetallic metallogenic belt and on the western edge of the Dafu complex rock mass. It is also an important uranium metallogenic belt in China and has favorable geological conditions for uranium mineralization.By previous exploration and prospecting, the exposed ore bodies are mainly concentrated in the "green" altered granite with rich polymetallic sulphides and controlled by structural faults, and the proven depth is not more than 300 m.It is concluded that there is still great prospecting space in depth.Based on the project of "investigation and Evaluation of uranium Resources in Hecaokeng area in the Middle part of Wuyishan metallogenic Belt", this paper takes the "green" altered granite closely related to uranium mineralization as the research object.Based on the interpretation of apparent resistivity data of Audio magnetotelluric sounding, the relationship between the variation characteristics of deep apparent resistivity and uranium mineralization in the study area is analyzed, and the anomalous environment of uranium metallogenic apparent resistivity in Hetaokeng area is discussed.In this paper, a detailed Audio magnetotelluric sounding study has been carried out in the ore-bearing area of known uranium deposits. The purpose of this study is to discuss the abnormal characteristics of apparent resistivity of altered granite in the ore-hosting area by comparing with known exploration profiles.The results show that the abnormal range of apparent resistivity in the favorable part of uranium mineralization (altered granite belt) ranges from 500 to 1000? M.Based on this, the distribution range of altered granite on each section of the study area is delineated.On the basis of the inversion interpretation of all two-dimensional apparent resistivity sections in the whole area, and combined with geological data, the plane equivalent maps of apparent resistivity at the depth of 100mg ~ 100m-1 ~ 300m ~ 500m are drawn respectively.Based on the characteristics of plane variation of apparent resistivity anomaly and the extensional state of ore-hosting structure at different depths, the plane distribution range of altered granite in each depth is analyzed.According to the anomalous environment conditions of uranium ore-forming apparent resistivity, the three-dimensional spatial distribution map and the thickness distribution map of altered granite are drawn according to the anomalous environment conditions of uranium metallogenic resistivity according to the 2-D inversion profile of each survey line and the plane equivalent map of the apparent resistivity of each depth.The spatial distribution, ore-conducting and ore-controlling tectonic extension of the "green" altered zone of granite are inferred. Finally, five favorable areas with prospecting potential are determined in the study area, which provides an important basis for further uranium prospecting.
【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P619.14;P631.3

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