本文選題：斑巖鉬礦　切入點：隱伏巖體　出處：《中國地質大學(北京)》2016年博士論文　論文類型：學位論文

【摘要】：石瑤溝大型鉬礦床地處豫西地區(qū)華北板塊南緣與秦嶺褶皺帶銜接部位的華熊地塊。礦區(qū)隸屬東秦嶺鉬礦帶,該帶匯集了南泥湖、上房溝、魚池嶺、東溝、雷門溝等一大批特大-大型鉬礦床,是我國最重要的鉬-金多金屬成礦帶。與該區(qū)其它斑巖型鉬礦床產(chǎn)出形態(tài)不同,石瑤溝鉬礦受控于一個未出露地表的隱伏花崗巖體,它的發(fā)現(xiàn)為東秦嶺豫西地區(qū)斑巖型鉬礦勘查評價提供了新的方向和典型工作區(qū)域。深入研究石瑤溝鉬礦成巖成礦作用,有利于進一步完善東秦嶺地區(qū)中生代斑巖型礦床成礦規(guī)律研究。在仔細地野外考察和鉆探巖芯詳細觀察編錄的基礎上,本文利用通過鏡下觀察、地球化學分析測試、Rb-Sr同位素分析測試、巖漿巖LA-ICP-MS鋯石U-Pb測年、Hf同位素特征以及H、O同位素測試研究等方法手段,研究石瑤溝隱伏花崗巖地球化學特征、巖漿源區(qū)、巖石成因、花崗巖演化過程等對鉬礦化的制約因素。同時,通過石瑤溝鉬礦特征與東秦嶺地區(qū)典型大型-超大型斑巖鉬礦特征進行對比研究,取得了如下認識和進展：(1)石瑤溝隱伏花崗巖年齡處于140.46±0.59 Ma～123.8±2.8 Ma,形成于早白堊世巖石圈伸展體制；近17Ma的年齡時差表明石瑤溝花崗巖具多期次活動特征,鉬成礦主要與斑狀花崗巖和花崗斑巖有關,成礦時代晚于成巖2-5Ma,成巖成礦處于同構造-巖漿地質背景中；含礦巖體為I-A過渡型高鉀鈣堿性系列-鉀玄巖系列花崗巖,富集REE、Rb、 K、Nb、Ta、Pb、Nd、Zr、Hf等元素,虧損Eu、Sr、Ba、P、Ti等元素,具弱—中等Eu負異常；(2)石瑤溝鉬礦含礦花崗巖具低εNd(t)(-13.96--13.10)、高TDM2(1.99-2.06)、高及寬泛的初始87Sr/86Sr比值(0.7077-0.7132)、低的εHf(t)值(介于-20.8-4.29,集中于-18.0-.6.8)和TDM2值(介于1.88-3.40 Ga,集中于1.88～2.18Ga),南秦嶺地區(qū)早期島弧俯沖形成的增生地殼、華北板塊基底太華群等下地殼物質,受熱的軟流圈地幔底侵加熱,發(fā)生部分熔融,從而形成石瑤溝花崗巖巖漿；(3)流體包裹體與穩(wěn)定同位素顯示,石瑤溝鉬早階段的成礦流體為高氧逸度、中高溫、中低鹽度、富CO_2的H_2O-NaCl-CO_2體系巖漿熱液,成礦晚階段為H_2O-NaCl體系熱液,成礦深度為2.3～5.8km。成礦物質為古老下地殼物質,還有少量幔源物質的參與。(4)石瑤溝含礦隱伏花崗巖高硅富堿偏酸性、高分異、強氧化的特征,顯示其具有較大的鉬礦化潛力。本文的主要創(chuàng)新有,確定了石瑤溝鉬礦含礦花崗巖為I—A過渡型花崗巖；將東秦嶺豫西地區(qū)典型斑巖鉬礦進行全面對比,探討確定了限制礦種與規(guī)模的主要因素；總結提出了東秦嶺豫西地區(qū)斑巖鉬礦成巖成礦模式�？傊�,石瑤溝鉬礦隱伏花崗巖體形成于中生代華北東部早白堊世巖石圈減薄、陸內伸展作用開始的構造背景下,形成深度大,產(chǎn)出Mo礦潛力巨大。
[Abstract]:The Shiyaogou large molybdenum deposit is located in the Huaxong block, where the southern margin of the North China plate and the Qinling fold belt join. The mining area belongs to the East Qinling molybdenum ore belt, which is a collection of South Nainihu, Shangfanggou, Yuchi Ridge and Donggou. A large number of mega-large molybdenum deposits, such as Remenggou, are the most important molybdenum and gold polymetallic metallogenic belts in China. Unlike other porphyry molybdenum deposits in this area, the Shiyaogou molybdenum deposit is controlled by a concealed granite body which is not exposed to the surface. Its discovery provides a new direction and a typical working area for the exploration and evaluation of porphyry molybdenum deposits in the western part of the East Qinling Mountains, and further studies on the diagenesis and mineralization of the Shiyaogou molybdenum deposit. It is beneficial to further improve the metallogenic regularity of Mesozoic porphyry deposits in the East Qinling area. On the basis of careful field investigation and detailed observation and cataloguing of drilling cores, this paper makes use of microscopic observation. Geochemical analysis, Rb-Sr isotopic analysis, LA-ICP-MS zircon U-Pb dating of magmatic rocks, HF isotopic characteristics of zircon U-Pb dating and Hau O isotopic measurements are used to study the geochemical characteristics, magmatic source and petrogenesis of the concealed granite in Shiyaogou. At the same time, the characteristics of Shiyaogou molybdenum deposit are compared with those of typical large and super-large porphyry molybdenum deposits in the East Qinling area. The results are as follows: (1) the age of Shiyaogou concealed granite is 140.46 鹵0.59 Ma~123.8 鹵2.8Ma, which was formed in the early Cretaceous lithospheric extensional system, and the time difference of nearly 17Ma indicates that the Shiyaogou granite has multi-stage activity characteristics. Molybdenum mineralization is mainly related to porphyry granite and granitic porphyry, the metallogenic age is 2-5 Ma later than that of diagenesis, and the diagenetic mineralization is in the same tectonic-magmatic geological setting. The elements such as REEN Rb, K ~ (+) Nb ~ (2 +) ~ TaPb ~ (2 +) ~ (2 +) ~ (2 +) ~ (2) ~ (2 +), etc. The ore-bearing granite of Shiyaogou molybdenum ore deposit has low 蔚 -Ndndtni-13.96- 13.10m, high TDM2U 1.99-2.06, high and broad initial 87s r-86Sr ratio 0.7077-0.7132U, low 蔚 Hftt) (between -20.8-4.29, concentrated in -18.0-.6.8) and TDM2 value (between 1.88-3.40 Ga, 1.882.18GaA and 1.882.18GaGaA). The accretive crust formed by the erosion, In the lower crust material such as Taihua Group, the basement of the North China plate, the heated asthenosphere mantle undergoes and partially melts, thus forming the Shiyaogou granite magma Yaogou granite.) fluid inclusions and stable isotopes are shown. The ore-forming fluid in early stage of Shiyaogou molybdenum is high oxygen fugacity, medium high temperature, low salinity, CO_2 rich H2O-NaCl-CO2 system magmatic hydrothermal fluid, late metallogenic stage is H _ 2O-NaCl system hydrothermal fluid, ore-forming depth is 2.3 ~ 5.8km.The ore-forming material is ancient lower crust material. There is also a small amount of mantle-derived material involved. (4) Shiyaogou ore-bearing concealed granite with high silicon-rich alkali-rich partial acidity, high differentiation, strong oxidation, which shows that it has great potential for molybdenum mineralization. The main innovations in this paper are, The ore-bearing granites of Shiyaogou molybdenum deposit are determined to be I-A transitional granites, the typical porphyry molybdenum deposits in the western part of East Qinling are compared comprehensively, and the main factors limiting the type and scale of ore are discussed. The porphyry molybdenum ore-forming model in the eastern Qinling and western Henan regions is summarized. In short, the concealed granite body of the Shiyaogou molybdenum deposit was formed in the tectonic setting of the early Cretaceous lithosphere thinning in the eastern part of Mesozoic and the beginning of intracontinental extension. The formation depth is large and the potential for producing Mo ore is great.
【學位授予單位】：中國地質大學(北京)
【學位級別】：博士
【學位授予年份】：2016
【分類號】：P611

【參考文獻】

相關期刊論文 前10條

1 翟明國;胡波;彭澎;趙太平;;華北中—新元古代的巖漿作用與多期裂谷事件[J];地學前緣;2014年01期

2 秦臻;戴雪靈;鄧湘?zhèn)?;東秦嶺秋樹灣銅鉬礦流體包裹體和穩(wěn)定同位素特征及其地質意義[J];礦床地質;2012年02期

3 盧欣祥;羅照華;黃凡;谷德敏;李明立;楊宗峰;黃丹峰;梁濤;劉傳權;張震;高源;;秦嶺—大別山地區(qū)鉬礦類型與礦化組合特征[J];中國地質;2011年06期

4 毛冰;葉會壽;李超;肖中軍;楊國強;;豫西夜長坪鉬礦床輝鉬礦錸-鋨同位素年齡及地質意義[J];礦床地質;2011年06期

5 楊宗鋒;羅照華;盧欣祥;黃凡;陳必河;;東秦嶺尚古寺斑巖鉬礦地質特征及成礦潛力分析[J];地質與勘探;2011年06期

6 黃凡;陳毓川;王登紅;袁忠信;陳鄭輝;;中國鉬礦主要礦集區(qū)及其資源潛力探討[J];中國地質;2011年05期

7 練翠俠;歐陽志強;賀忠春;;陜西省商洛市潘河鉬礦地質特征及成因分析[J];礦床地質;2011年03期

8 鄧小華;姚軍明;李晶;劉國飛;;河南省西峽縣石門溝鉬礦床流體包裹體特征和成礦時代研究[J];巖石學報;2011年05期

9 申保川;李建宏;王存智;馬艾陽;;河南嵩縣安溝鉬礦地質特征[J];資源調查與環(huán)境;2011年01期

10 葉會壽;毛景文;何春芬;何岳;孟芳;;河南付店礦集區(qū)斑巖鉬礦和脈狀鉛鋅礦地質特征與成礦時代[J];礦床地質;2010年S1期

相關博士學位論文 前1條

1 郭保健;東秦嶺中生代金屬礦床組合與成礦規(guī)律研究[D];中國地質大學（北京）;2006年

，

本文編號：1579492