本文選題：煌斑巖　切入點(diǎn)：巖石地球化學(xué)　出處：《地學(xué)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(guān)系密切的燕山期花崗巖體。本次研究在詳細(xì)野外調(diào)查和巖相學(xué)研究基礎(chǔ)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(zhì)低鈦煌斑巖,地球化學(xué)特征顯示強(qiáng)烈虧損Nb、Ta、Zr、Hf、Ti等高場(chǎng)強(qiáng)元素,相對(duì)富集Rb、Ba、Sr、Pb等大離子親石元素和高場(chǎng)強(qiáng)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(shuō)明區(qū)內(nèi)存在印支期巖漿活動(dòng);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(chǎn)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(dòng),是南嶺中生代大規(guī)模巖漿活動(dòng)同一構(gòu)造背景下的產(chǎn)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(zhǎng)安大學(xué)地球科學(xué)與資源學(xué)院;長(zhǎng)安大學(xué)西部礦產(chǎn)資源與地質(zhì)工程教育部重點(diǎn)實(shí)驗(yàn)室;陜西中核資源有限公司;中國(guó)地質(zhì)科學(xué)院礦產(chǎn)資源研究所;桂林理工大學(xué)地球科學(xué)學(xué)院;
【基金】：國(guó)土資源部公益性行業(yè)科研專項(xiàng)“南嶺東段九龍腦礦田成礦規(guī)律與深部找礦示范”(201411050) 國(guó)家重點(diǎn)研發(fā)計(jì)劃課題(2016YFC0600208) 國(guó)家自然科學(xué)基金重點(diǎn)資助計(jì)劃(41430314);國(guó)家自然科學(xué)基金項(xiàng)目(41372092) 2017年長(zhǎng)安大學(xué)“優(yōu)秀博士學(xué)位論文培育資助項(xiàng)目”
【分類號(hào)】：P597.3;P618.67

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