本文選題：永平—石塘 + 推覆構(gòu)造��； 參考：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：永平—石塘推覆構(gòu)造及龍頭崗礦區(qū)位于華夏板塊西北緣的北武夷成礦帶,中侏羅世以來由于東亞巖石圈大規(guī)模的板塊運(yùn)動,導(dǎo)致該成礦帶強(qiáng)烈的構(gòu)造變形和巖漿作用。本論文是在野外地質(zhì)調(diào)研、系統(tǒng)地收集和整理前人研究成果的基礎(chǔ)上,對成礦地質(zhì)構(gòu)造背景、礦床地質(zhì)特征等進(jìn)行綜合研究,總結(jié)構(gòu)造控礦規(guī)律和礦床成因。取得的主要成果和結(jié)論如下：1、永平一石塘推覆構(gòu)造是由于燕山期時伊佐奈崎板塊向歐亞板塊俯沖、擠壓形成,受控于中元古界滹沱系至新元古界震旦系上統(tǒng)組成的的中侏羅世推覆體,推到下侏羅統(tǒng)水北組地層之上,推覆方向為來自南東向,推覆時代大致從175-150 Ma。外來巖系變形強(qiáng)烈,原地巖系主要表現(xiàn)為褶皺發(fā)育。2、龍頭崗礦區(qū)位于永平—石塘推覆體內(nèi)部,礦體形態(tài)主要受由于中生代推覆構(gòu)造而形成的倒轉(zhuǎn)褶皺中的層間滑脫構(gòu)造控制,熱液通過由NW向擠壓應(yīng)力場下產(chǎn)生的共軛剪切斷裂F2和F4為熱液提供侵位的通道,后期形成的斷裂F3及持續(xù)發(fā)育的推覆構(gòu)造對礦體有一定改造作用。3、龍頭崗礦區(qū)發(fā)育的巖漿巖主要為花崗斑巖、二長花崗斑巖和黑云母二長花崗斑巖。通過LA-ICP-MS鋯石U-Pb法對二長花崗斑巖、黑云母二長花崗斑巖進(jìn)行測年,獲得這2種巖漿巖的年齡分別為153.9±1.4Ma (MSWD=4.1)、151.3±1.4Ma (MSWD=2.2)成礦時代為晚侏羅世和早白堊世。4、根據(jù)龍頭崗礦區(qū)構(gòu)造變形、礦床特征,及其與贛東北地區(qū)中侏羅世以來構(gòu)造背景及典型銅多金屬礦床成礦時代對比建立,認(rèn)為在區(qū)域推覆構(gòu)造特別發(fā)育的地方,當(dāng)滿足上覆老地層之下含有C20賦礦巖層,且有花崗巖巖體存在時,在該區(qū)有可能蘊(yùn)藏有銅多金屬礦床,有待開展進(jìn)一步工作。龍頭崗礦床即為受中侏羅世以來(170-150 Ma)推覆構(gòu)造控制并與同時期巖漿侵入活動有關(guān)的淺部矽卡巖型—深部斑巖型銅多金屬礦床。
[Abstract]:Yongping-Shitang nappe tectonics and the northern Wuyi metallogenic belt located in the northwestern margin of the Huaxia plate in the Longtougang mining area. Since the Middle Jurassic, the tectonic deformation and magmatism of the metallogenic belt have been strong due to the large-scale plate movement in the lithosphere of East Asia. On the basis of field geological investigation and systematic collection and collation of previous research results, this paper comprehensively studies the geological background and geological characteristics of ore-forming structures, and summarizes the rules of tectonic ore-controlling and the genesis of ore deposits. The main achievements and conclusions obtained are as follows: 1. The Yitang nappe structure in Yongping was formed by the Yanshanizaki plate subducting into the Eurasian plate during the Yanshanian period. The Middle Jurassic nappe, controlled by the Middle Proterozoic Hutuo system to the Neoproterozoic Sinian Upper Series, was pushed above the formation of the Lower Jurassic Shuibei formation. The direction of the nappe is from the south to the east, and the nappe age ranges from 175-150 Ma. The deformation of the extraneous rock series is strong, the in-situ rock series is mainly characterized by fold development, the Longtougang mining area is located in the Yongping-Shitang nappe body, and the orebody shape is mainly controlled by the interlayer slip structure in the inverted fold formed by the Mesozoic nappe structure. Hydrothermal solution provides an emplacement channel for hydrothermal solution through conjugate shear fracture F2 and F4 produced by NW extrusion stress field. The fault F3 formed in the late stage and the continuously developing nappe structure have a certain remaking effect on the orebody. The magmatic rocks developed in the Longtougang mine area are mainly granitic porphyry, Erchang granitic porphyry and biotite monzagonal granitic porphyry. The dating of Erchang granitic porphyry and biotite granitic porphyry is studied by LA-ICP-MS zircon U-Pb method. The age of these two magmatic rocks is 153.9 鹵1.4Ma / 4.1mwdf. 151.3 鹵1.4Ma / MSWD2.2respectively) the metallogenic ages are late Jurassic and early Cretaceous .4. according to the tectonic deformation of the Doutougang mine, the age of the two magmatic rocks is 153.9 鹵1.4Ma. The characteristics of the deposits, and their correlation with the tectonic setting since the Middle Jurassic and the metallogenic ages of typical copper polymetallic deposits in northeast Jiangxi, suggest that where the regional nappe structures are particularly developed, there are C20 ore-bearing strata below the overlying old strata. When granitic rock mass exists, copper polymetallic deposit may exist in this area, which needs further work. The Longtougang deposit is a shallow skarn-deep porphyry copper polymetallic deposit controlled by the nappe structure since the Middle Jurassic and related to the magmatic intrusion of the same period.
【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】：P613

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本文編號：1969802