本文選題：煌斑巖　切入點：巖石地球化學　出處：《地學前緣》2017年05期

【摘要】：淘錫坑鎢礦床是贛南崇(義)-(大)余-(上)猶鎢錫多金屬成礦帶上重要的石英脈型鎢礦床,深部存在與成礦關系密切的燕山期花崗巖體。本次研究在詳細野外調查和巖相學研究基礎上,首次在淘錫坑鎢礦區(qū)發(fā)現(xiàn)煌斑巖脈,巖石定名為閃輝正煌巖,屬于鈣堿性鉀質低鈦煌斑巖,地球化學特征顯示強烈虧損Nb、Ta、Zr、Hf、Ti等高場強元素,相對富集Rb、Ba、Sr、Pb等大離子親石元素和高場強元素LREE的特征。利用LAICP-MS鋯石U-Pb同位素定年,獲得兩組年齡,223.3~228.5 Ma可能代表了煌斑巖漿中所捕獲鋯石的年齡,說明區(qū)內存在印支期巖漿活動;158.2~159.6 Ma為煌斑巖脈的侵入年齡。該煌斑巖的侵位是與燕山期(170~150 Ma)南嶺地區(qū)巖石圈發(fā)生全面伸展-減薄,大規(guī)模陸殼重熔型花崗巖類產出相伴隨,記錄了本區(qū)存在印支期和燕山期兩期巖漿活動,是南嶺中生代大規(guī)模巖漿活動同一構造背景下的產物。
[Abstract]:The Taoxikeng tungsten deposit is an important quartz vein type tungsten deposit in the Tungsten and tin polymetallic metallogenic belt in southern Jiangxi. On the basis of detailed field investigation and petrographic study, the lamprophyre vein was first discovered in the Tungsten ore area of Taoxikeng, which is named as diorite orthosamarite, in the depth of Yanshanian granitic body, which is closely related to mineralization. It belongs to calc-alkaline potash low-titanium lamprophyre, and its geochemical characteristics show that it is strongly depleted of high field strength elements such as NB ~ (2 +) ~ (2 +) ~ (2 +) ~ (2 +) ~ (2 +), LREE, etc., and it is relatively rich in large ion lithophile elements such as RB _ (b) Ba ~ (2 +) Sr ~ (2 +) Pb and high field strength element (LREE). Two sets of ages (223.3 ~ 228.5 Ma) may represent the ages of zircon trapped in lamprophyre magma. It is suggested that the Indosinian magmatic activity of 158.2 ~ 159.6 Ma is the intrusive age of the lamprophyre vein. The emplacement of the lamprophyre is associated with the comprehensive extension and thinning of the lithosphere in the Nanling area of the Yanshanian period, and the occurrence of large-scale continental crust-remelting type granitoids. The magmatic activities of Indosinian and Yanshanian periods are recorded in this area, which are the products of the same tectonic setting of the Mesozoic large-scale magmatic activities in Nanling.
【作者單位】： 長安大學地球科學與資源學院;長安大學西部礦產資源與地質工程教育部重點實驗室;陜西中核資源有限公司;中國地質科學院礦產資源研究所;桂林理工大學地球科學學院;
【基金】：國土資源部公益性行業(yè)科研專項“南嶺東段九龍腦礦田成礦規(guī)律與深部找礦示范”(201411050) 國家重點研發(fā)計劃課題(2016YFC0600208) 國家自然科學基金重點資助計劃(41430314);國家自然科學基金項目(41372092) 2017年長安大學“優(yōu)秀博士學位論文培育資助項目”
【分類號】：P597.3;P618.67

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