【摘要】：寧國竹溪嶺鎢銀礦床是近些年來在皖南發(fā)現(xiàn)的一個與花崗巖類關(guān)系密切的矽卡巖型鎢銀礦床�；趯χ裣獛X鎢銀礦床地質(zhì)特征的研究,本文對竹溪嶺鎢銀礦床賦礦巖體花崗閃長巖的地球化學(xué)特征進行了研究,同時應(yīng)用現(xiàn)代同位素定年技術(shù)開展了該礦床及其相關(guān)侵入巖體的同位素地質(zhì)年代學(xué)研究,獲得主要的認識和成果如下:竹溪嶺鎢銀礦床的礦體主要賦存于南華-震旦系沉積地層、竹溪嶺巖體及其接觸部位,礦體呈似層狀、透鏡狀產(chǎn)出。礦區(qū)發(fā)育花崗閃長巖、花崗閃長斑巖和花崗斑巖等3種中酸性侵入巖,LA-ICP MS鋯石U-Pb年齡分別為139.8±1.8Ma、140.2±1.7Ma、143.3±1.9Ma,它們在誤差范圍內(nèi)一致,為燕山晚期早白堊世巖漿活動的產(chǎn)物。其中,花崗閃長巖為礦區(qū)主要巖漿巖體,也是主要賦礦巖體,與成礦密切相關(guān)。賦礦花崗閃長巖主量元素特征表明其屬于高鉀鈣堿性系列過鋁質(zhì)花崗巖。微量元素和稀土元素特征顯示富集La、Hf、Sm、Y,虧損Nb、Ta、P、Ti。(87Sr/86Sr)i值為0.70655~0.70806,εSr(t)為31.5~52.9,εNd(t)值為-6.1~-7.6,Sr-Nd-Pb同位素特征表明賦礦花崗閃長巖具有殼�；煸刺卣�,以殼源物質(zhì)成分為主。對礦床礦石中的輝鉬礦進行了Re-Os年齡測試,獲得兩件輝鉬礦Re-Os模式年齡分別為142.7±2.1Ma和142.9±2.1Ma,顯示礦床成礦年齡與巖漿巖成巖年齡基本一致,成礦也為燕山晚期早白堊世。礦石礦物輝鉬礦中Re的含量為63.2×10-6、66.7×10-6,指示成礦物質(zhì)來源為殼幔混合來源,顯示出與與竹溪嶺花崗閃長巖成巖物質(zhì)來源一致的特征。區(qū)域巖漿巖及礦床對比表明,與之相鄰的長江中下游地區(qū)、浙西地區(qū)和贛東北地區(qū)乃至整個華南地區(qū)這一時期都發(fā)生了大規(guī)模的巖漿作用和鎢錫多金屬成礦作用,顯示揚子板塊在此階段處在一個巖漿-成礦大爆發(fā)時期,皖南地區(qū)的成礦時代對應(yīng)于華南中生代三次大規(guī)模成礦作用的第二階段。
[Abstract]:The Ningguo Zhuxiling tungsten silver deposit is a skarn type tungsten silver deposit found in the south of Anhui province in recent years. Based on the study of the geological characteristics of the Zhuxiling tungsten silver deposit, the geochemical characteristics of granodiorite in the ore-bearing rock body of the Zhuxiling tungsten silver deposit have been studied in this paper. At the same time, the isotopic geochronology of the deposit and its associated intrusive rock bodies has been carried out using modern isotopic dating techniques. The main results are as follows: the orebody of Zhuxiling tungsten silver deposit mainly occurs in the sedimentary strata of Nanhua-Sinian system, the Zhuxiling rock body and its contact position, and the orebody is layered and lenticular. The LA-ICP-MS zircon U-Pb age of three intermediate-acid intrusive rocks, granodiorite, granodiorite and granodiorite are 139.8 鹵1.8 Ma-140.2 鹵1.7 Ma-143.3 鹵1.9 Ma. they are consistent within the range of errors and are the product of early Cretaceous magmatic activity in the late Yanshanian. Among them, granodiorite is the main magmatic rock body in the ore area, and is also the main ore-bearing rock mass, which is closely related to mineralization. The main element characteristics of granodiorite indicate that the granodiorite belongs to high potassium calc-alkaline series peraluminous granites. The characteristics of trace elements and rare earth elements show that they are enriched in LahfhfSm (Y), depleted (87Sr/86Sr) I is 0.70655 (0.70806), 蔚 Sr (t) is 31.5 (52.9), 蔚 Nd (t) is -6.1 ~ (-1) -7.6GN ~ (d-Pb) isotopic characteristics, indicating that granodiorite is characterized by crustal and mantle migmatism, mainly crustal material composition. The Re-Os age of molybdenum ore in the deposit is measured. The Re-Os model ages of two molybdenum ores are 142.7 鹵2.1Ma and 142.9 鹵2.1 Ma.The results show that the metallogenic age of the deposit is basically the same as that of magmatic rocks, and the mineralization is also the early Cretaceous of late Yanshanian. The content of re in molybdenum ore is 63.2 脳 10-6 + 66.7 脳 10-6, indicating that the source of ore-forming material is the mixed source of crust and mantle, which shows the same characteristics as the source of diagenetic material of Zhuxi ridge granodiorite. The regional magmatic rocks and their ore deposits show that large-scale magmatism and tungsten-tin polymetallic mineralization took place in the middle and lower reaches of the Yangtze River, the western Zhejiang region, the northeast Jiangxi area and the whole South China during this period. It is shown that the Yangtze plate is in a period of magma-metallogenic eruption in this stage, and the metallogenic age in southern Anhui corresponds to the second stage of three large-scale metallogenic processes in the Mesozoic of South China.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P597.3;P618.67;P618.52

【參考文獻】

相關(guān)期刊論文 前10條

1 祝紅麗;楊曉勇;孫衛(wèi)東;;皖南祁門三堡地區(qū)花崗閃長斑巖的成因:地球化學(xué)、年代學(xué)和Hf同位素特征制約[J];巖石學(xué)報;2015年07期

2 陳芳;王登紅;杜建國;許衛(wèi);王克友;余有林;湯金來;;安徽寧國蘭花嶺鎢鉬礦床含礦巖體的地球化學(xué)特征、LA-ICP-MS鋯石U-Pb年代學(xué)研究[J];大地構(gòu)造與成礦學(xué);2015年02期

3 李斌;張贊贊;吳明安;周濤發(fā);趙文廣;蔡曉兵;狄勤松;;皖南寧國大塢尖鎢鉬礦床成巖成礦年齡——以花崗閃長斑巖鋯石U-Pb和輝鉬礦Re-Os年齡為依據(jù)[J];地質(zhì)通報;2015年Z1期

4 李雙;孫賽軍;楊曉勇;孫衛(wèi)東;;皖南烏溪斑巖型金礦床賦礦侵入巖體的巖石地球化學(xué)及年代學(xué)研究[J];大地構(gòu)造與成礦學(xué);2015年01期

5 趙玲;陳志洪;;皖南譚山巖體的鋯石定年及地質(zhì)意義[J];資源調(diào)查與環(huán)境;2014年03期

6 黃文成;葉海敏;孟慶秀;;皖南新元古代雙峰式巖墻群的年齡、地球化學(xué)特征及地質(zhì)意義[J];資源調(diào)查與環(huán)境;2014年03期

7 陳子微;余心起;周翔;郝國勝;邱駿挺;李鵬舉;;皖南休寧縣里東坑似斑狀花崗閃長巖成巖成礦特征分析[J];中國地質(zhì);2013年06期

8 陳雪霏;汪應(yīng)庚;孫衛(wèi)東;楊曉勇;;皖南寧國竹溪嶺地區(qū)花崗巖鋯石U-Pb年代學(xué)及地球化學(xué)及其成因研究[J];地質(zhì)學(xué)報;2013年11期

9 李雙;楊曉勇;孫衛(wèi)東;;皖南歙縣鄧家塢鉬礦床年代學(xué)及Hf同位素地球化學(xué)研究[J];巖石學(xué)報;2012年12期

10 謝建成;陳思;榮偉;李全忠;楊曉勇;孫衛(wèi)東;;安徽牯牛降A(chǔ)型花崗巖的年代學(xué)、地球化學(xué)和構(gòu)造意義[J];巖石學(xué)報;2012年12期

，

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