滇東南薄竹山—老君山礦集區(qū)Sn-W與Pb-Zn-Ag礦致異常提取及其找礦靶區(qū)圈定
本文選題：主成分分析 + 二維經(jīng)驗(yàn)?zāi)７纸?/strong>�。� 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2017年碩士論文
【摘要】：薄竹山-老君山礦集區(qū)位于個(gè)舊-大廠錫鎢多金屬成礦帶中段,發(fā)育了一系列包括白牛廠、官房和都龍?jiān)趦?nèi)的世界級(jí)錫-鎢及銀-鉛-鋅多金屬礦床。本文基于滇東南薄竹山-老君山地區(qū)1∶20萬(wàn)化探掃面數(shù)據(jù),利用主成分分析法和二維經(jīng)驗(yàn)?zāi)７纸夥椒?提取該區(qū)Sn-W和Pb-Zn-Ag的礦致異常并圈定找礦靶區(qū)。通過(guò)研究得出如下結(jié)論:(1)主成分分析能夠確定元素之間的內(nèi)在聯(lián)系并確定成巖、成礦元素共生組合,而因子得分圖可以從空間上揭示元素組合異常與地質(zhì)體(地層、巖體、礦體)的空間分布關(guān)系。滇東南地區(qū)存在三種因子組合:(1)[Fe2O3-Ti-Cr-V-Ni-Co-Al2O3-Cu-Nb-Y-Zn-Mn]—-[SiO2],正載荷為Fe2O3-Ti-Cr-V-Ni-Co-Al2O3-Cu-Nb-Y-Zn-Mn代表了研究區(qū)的親基性巖石組合;負(fù)載荷為SiO2,表明在地質(zhì)演化過(guò)程中,隨著SiO2含量增加,上述元素組合含量逐漸降低;(2)Bi-W-Sn-As-Pb組合代表了研究區(qū)中高溫?zé)嵋撼傻V元素組合(如個(gè)舊和官房W-Sn多金屬礦化);(3)[Sb-Hg-As]—-[Na2O-Sr]可能代表某種礦化的低溫?zé)嵋涸亟M合;(4)Ag-Cd-Zn-(Pb)組合代表了研究區(qū)典型中低溫?zé)嵋撼傻V元素組合(如白牛廠超大型Ag-Cd-Zn-Pb多金屬礦化,都龍超大型錫多金屬礦化)。(2)本文共圈定兩個(gè)鎢錫成礦有利地段,兩個(gè)地段均位于花崗巖與圍巖的內(nèi)接觸帶中,推測(cè)是因?yàn)閹r漿的上侵作用,導(dǎo)致巖體周圍形成了大量的張性裂隙,巖漿熱液沿著裂隙和巖層層面運(yùn)移并與圍巖充填交代,最后礦化形成巖體周邊的脈狀、細(xì)脈帶。(3)銀鉛鋅高異常區(qū)除了沿燕山期花崗巖與圍巖的接觸帶分布,還受到北東向、北西向、南北向的三級(jí)斷裂控制,表明區(qū)內(nèi)構(gòu)造對(duì)礦化的富集具有明顯的控制作用,這些三級(jí)斷裂和層間破碎帶可作為重要的容礦通道。因此具有組合元素異常的三級(jí)斷裂、破碎帶與接觸帶是尋找銀鉛鋅礦床的有利地段。(4)結(jié)合兩種方法對(duì)地球化學(xué)數(shù)據(jù)進(jìn)行處理,不僅成功獲取了成礦元素組合,還發(fā)現(xiàn)已知礦點(diǎn)、構(gòu)造、巖體等地質(zhì)要素與分解的地球化學(xué)異常圖具有較高的吻合度,證明了這兩種方法能夠準(zhǔn)確有效地提取化探元素異常并圈定成礦有利地段,應(yīng)結(jié)合兩種方法圈定找礦靶區(qū),為找礦工作提供科學(xué)的依據(jù)。
[Abstract]:The Paozhushan-Laojunshan ore concentration area is located in the middle of Gejiu-Dachang tin-tungsten polymetallic metallogenic belt and has developed a series of world-class tin-tungsten and silver-lead-zinc polymetallic deposits including Biniuchang Guanfang and Dulong. Based on the 1: 200 000 geochemical sweep surface data of Bao-zhushan-Laojunshan area in southeastern Yunnan, the ore induced anomalies of Sn-W and Pb-Zn-Ag in this area are extracted by principal component analysis and two-dimensional empirical mode decomposition method, and the ore-prospecting targets are delineated. The conclusion is as follows: (1) Principal component analysis (PCA) can determine the intrinsic relationship between elements, diagenesis, symbiotic assemblage of metallogenic elements, and factor score map can reveal the anomaly of element assemblage and geological bodies (strata, rock mass, rock mass) spatially. The spatial distribution of the orebody. In southeastern Yunnan, there are three kinds of factor assemblages: [Fe2O3-Ti-Cr-V-Ni-Co-Al2O3-Cu-Nb-Y-Zn-Mn]-[SiO2]. The positive load of Fe2O3-Ti-Cr-V-Ni-Co-Al2O3-Cu-Nb-Y-Zn-Mn represents the basophilic rock assemblage in the study area, and the loading load is Sio _ 2, which indicates that during the geological evolution, the content of SiO2 increases with the increase of the content of SiO2. The decrease of the content of the above element assemblage gradually indicates that the Xian2Bi-W-Sn-As-Pb assemblage represents the low temperature hydrothermal metallogenic element assemblage (such as Gejiu and Guanfang W-Sn polymetallic mineralization) [Sb-Hg-As]-[Na2O-Sr], a low temperature hydrothermal element assemblage that may represent some mineralization, and represents the low temperature hydrothermal element combination of 4Ag-Cd-Zn-Pbb, for example, Gejiu and Guanfang W-Sn polymetallic mineralization. The typical middle-low temperature hydrothermal metallogenic element assemblage (such as bainiuchang super-large Ag-Cd-Zn-Pb polymetallic mineralization) in the study area was studied. Dulong super-large tin polymetallic mineralization. 2) this paper delineates two favorable areas for tungsten and tin mineralization, both of which are located in the inner contact zone between granite and surrounding rock, presumably because of the magma transgression. As a result of the formation of a large number of tensional fractures around the rock mass, magmatic hydrothermal fluid moves along the fissures and strata and fills up with the surrounding rocks, and finally mineralizes to form veins around the rock mass. In addition to the distribution along the contact zone between granite and surrounding rock in Yanshanian period, the Ag-Pb-Zn high anomalous area is also controlled by the third-order faults in the NNE, NW and NNE directions, indicating that the tectonics in the region have an obvious controlling effect on the mineralization enrichment. These three-order faults and interlayer fracture zones can be used as important ore-bearing channels. Therefore, the third order fault with assemblage element anomaly, fracture zone and contact zone are favorable areas for finding silver, lead and zinc deposits. The geochemical data are processed by combining two methods. Not only the metallogenic element assemblage is obtained successfully, but also the known ore points are found. The geological elements such as structure and rock mass have a high degree of agreement with the geochemical anomaly map of decomposition, which proves that these two methods can extract geochemical element anomalies accurately and effectively and delineate favorable metallogenic areas, and should be combined with two methods to delineate ore-prospecting target areas. To provide scientific basis for prospecting work.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P618.2
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