發(fā)布時間：2018-06-13 17:22

  本文選題：陽山金礦 + 地球化學(xué)找礦模型�。� 參考：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：陽山金礦帶地處甘肅省南部,屬“川陜甘金三角”區(qū),而且陽山金礦是全國近期發(fā)現(xiàn)規(guī)模最大的金礦。研究并建立陽山金礦地質(zhì)地球化學(xué)找礦模型具有重要意義,可以為我國金礦資源勘查和川陜甘地區(qū)及周邊找礦預(yù)測提供借鑒。本文在收集陽山金礦床地質(zhì)資料和區(qū)域巖石、礦區(qū)巖石、區(qū)域水系沉積物化探數(shù)據(jù)的基礎(chǔ)上,研究礦床的地質(zhì)特征、地球化學(xué)異常特征,同時初步研究了陽山金礦區(qū)巖石風(fēng)化過程中微量元素的定量變化,建立了陽山金礦的地質(zhì)-地球化學(xué)找礦模型。主要得出以下結(jié)論:甘肅陽山金礦床為一超大型礦床,位于隴南市文縣境內(nèi),礦體呈出露狀態(tài)。賦礦地層主要為泥盆系三河口群千枚巖。成礦與區(qū)內(nèi)花崗斑巖脈有關(guān)系密切,花崗斑巖成巖年齡約200±9Ma。金礦體受安昌河-觀音壩斷裂控制,主要賦存于次級剪切帶或斷裂中。礦石類型主要為蝕變千枚巖型和蝕變斜長花崗斑巖脈型,礦體形態(tài)呈脈狀。圍巖蝕變主要以硅化、絹云母化、碳酸鹽化、黃鐵礦化為主。陽山金礦區(qū)花崗斑巖類巖石與中國花崗巖相比,明顯相對富集Al2O3和Ca O,其富集系數(shù)為1.15和1.26。陽山金礦區(qū)蝕變斜長花崗斑巖與陽山斜長花崗斑巖相比,在微量元素方面富集系數(shù)大于2.5的元素有Au、Co、Sb;即蝕變或成礦過程相對富集Au、Co、Sb。區(qū)域水系沉積物化探研究顯示,相對于中國水系沉積物而言,陽山金礦區(qū)水系沉積物中明顯富集Au、Sb、Hg、Cd,富集系數(shù)均大于2.5,其中Au的富集系數(shù)為2.84。結(jié)合元素地球化學(xué)異常剖析圖,結(jié)果表明該礦區(qū)金礦成礦指示元素組合為Au、As、Sb、Hg、Cd、Ba、Li計7項元素。依據(jù)定量刻畫風(fēng)化過程中微量元素行為的經(jīng)驗方程對陽山礦區(qū)巖石在風(fēng)化過程中元素的定量研究,表現(xiàn)出不相容元素中Li、Be、F在礦區(qū)出現(xiàn)富集,熱液成礦元素中Bi、Cd、As、Sb、Hg計5項元素整體表現(xiàn)出正異常。前面通過區(qū)域巖石地球化學(xué)特征和地球化學(xué)剖析圖確定的成礦指示元素組合Au、Sb、Hg、Cd、Ba、Li、As�；谏鲜鲅芯拷⒘烁拭C陽山金礦地質(zhì)地球化學(xué)找礦模型。
[Abstract]:Yangshan gold belt, located in the south of Gansu Province, belongs to the "Sichuan, Shaanxi and Gansu Golden Triangle", and Yangshan Gold Mine is the largest gold deposit recently discovered in China. It is of great significance to study and establish the geological and geochemical prospecting model of Yangshan gold deposit, which can be used as a reference for the exploration of gold resources in China and the prospecting prediction in and around Sichuan, Shaanxi and Gansu. Based on the geological data of the Yangshan gold deposit and the geochemical exploration data of regional rocks, rocks and regional drainage sediments, the geological characteristics and geochemical anomalies of the deposits are studied in this paper. At the same time, the quantitative change of trace elements in the weathering process of rock in Yangshan gold deposit is studied, and the geological geochemical prospecting model of Yangshan gold deposit is established. The main conclusions are as follows: the Yangshan gold deposit in Gansu Province is a super large deposit located in Wenxian County of Longnan City and the orebody is exposed. The ore-bearing strata are mainly phyllite of the Devonian Sanhekou Group. The mineralization is closely related to the granitic porphyry vein in the area, and the diagenetic age of the granitic porphyry is about 200 鹵9 Ma. The gold orebody is controlled by the Anchang-Guanyinba fault and mainly occurs in the secondary shear zone or fault. The ore types are mainly altered phyllite type and altered long granitic porphyry vein type. The main alteration of surrounding rock is silicification, sericite, carbonization and pyrite. The granitic porphyry rocks in Yangshan gold deposit are obviously enriched in Al _ 2O _ 3 and Ca _ 2O as compared with the granites in China, and their enrichment coefficients are 1.15 and 1.26 respectively. Compared with Yangshan plagioclase granitic porphyry in Yangshan gold deposit, the elements with enrichment coefficient greater than 2.5 in trace elements are Au-CoCoSb, that is, au CoCoSb is relatively enriched in alteration or metallogenic process. The geochemical study on the sediments of the regional drainage system shows that, compared with the sediments of the water system of China, the gold deposits of Yangshan gold deposit are obviously enriched in the sediments of the water system of the Yangshan Gold Mine, and the enrichment coefficients of au are all greater than 2.5, and the enrichment coefficient of au is 2.84. Combined with the analysis of geochemical anomalies of elements, the results show that the metallogenic indicator element assemblage of gold deposit in this area is 7 elements. Based on the empirical equation of quantitative characterization of trace element behavior in weathering process, the quantitative study of elements in rock weathering process in Yangshan mining area shows that the incompatible elements of Li-BeBeF are enriched in the mining area. In the hydrothermal metallogenic elements, the total positive anomalies of the five elements of the BigCdCd-As-Sb-Hg have been observed. The metallogenic indicator element assemblage determined by the geochemical characteristics of regional rocks and geochemical analysis map in the first place is the Auto-SbSbHgcdcdcdcdcdcdcdcdcdcdcdcdcdb@@ Based on the above study, a geological and geochemical prospecting model of Yangshan gold deposit was established.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.51

【參考文獻】

相關(guān)期刊論文 前4條

1 郭俊華,齊金忠,孫彬,余金元,袁士松;甘肅陽山特大型金礦床地質(zhì)特征及成因[J];黃金地質(zhì);2002年02期

2 季宏兵,歐陽自遠,王世杰,周德全;Element geochemistry of weathering profile of dolomitite and its implications for the average chemical composition of the upper-continental crust——Case studies from the Xinpu profile, northern Guizhou Province, China[J];Science in China(Series D:Earth Sciences);2000年01期

3 李建忠;劉洪波;李勇;劉多林;陳澤太;;甘肅省文縣陽山金礦帶成礦地質(zhì)特征及找礦方向[J];礦產(chǎn)與地質(zhì);2010年03期

4 李艷麗;王世杰;孫承興;劉秀明;;碳酸鹽巖紅色風(fēng)化殼Ce異常特征及形成機理[J];礦物巖石;2005年04期

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本文編號：2014785