本文關(guān)鍵詞：青海賽什騰山早古生代花崗巖地球化學(xué)特征及意義　出處：《礦物巖石地球化學(xué)通報(bào)》2016年05期 　論文類(lèi)型：期刊論文

  更多相關(guān)文章： Ⅰ型花崗巖 地球化學(xué) 島弧 賽什騰山

【摘要】：為揭示柴北緣復(fù)雜的構(gòu)造演化特征,用X射線(xiàn)熒光光譜(XPF)、電感耦合等離子質(zhì)譜(ICP-MS)等方法對(duì)賽什騰山花崗閃長(zhǎng)巖、花崗巖和二長(zhǎng)花崗巖進(jìn)行了系統(tǒng)的全巖地球化學(xué)與微量元素研究。結(jié)果表明,賽什騰山巖體富含Si O2(64.23%~71.56%)、Al2O3(14.03%~18.36%);K2O/Na2O值平均為0.48,具準(zhǔn)鋁質(zhì)-弱過(guò)鋁質(zhì)、鈣堿性特征;巖石相對(duì)富集Th、U、Sr,虧損Ta-Nb、Ti、Pb;稀土總量變化幅度較大(74.29×10-6~169.11×10-6),輕重稀土分餾明顯,弱Eu負(fù)異常特征;主微量元素圖解及對(duì)比分析顯示出Ⅰ型花崗巖特點(diǎn)。結(jié)合其他資料,可以認(rèn)為賽什騰山巖體形成于島弧環(huán)境,是地幔上侵混染了大陸地殼形成的產(chǎn)物,該花崗巖侵位時(shí)南祁連洋尚未閉合。
[Abstract]:In order to reveal the structure of the northern margin of the Qaidam Basin complex evolution characteristics, using X ray fluorescence (XPF), inductively coupled plasma mass spectrometry (ICP-MS) method of whole rock geochemistry and trace elements of system of diorite, granite and granite two of SERTENGSHAN granite. The results show that the SERTENGSHAN rock rich in Si O2 (64.23%~71.56%), Al2O3 (14.03%~18.36%); the average K2O/Na2O value was 0.48, with metaluminous peraluminous and calc alkaline characteristics; rock is relatively enriched in Th, U, Sr, Ta-Nb, Ti, Pb loss; rare earths vary greatly (74.29 * 10-6~169.11 * 10-6), REE fractionation is obvious, weak negative Eu anomalies; graphic analysis and comparison of main trace elements show the characteristics of I-type granite. Combined with other information, can think of SERTENGSHAN rock formed in the island arc environment, is a product of mantle intrusion of contaminated continental crust, the Granite Emplacement in South Qilian ocean has not yet closed.
【作者單位】： 西北師范大學(xué)地理與環(huán)境科學(xué)學(xué)院;中國(guó)地質(zhì)大學(xué)(武漢)地理科學(xué)與資源學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41262001) 甘肅省科技支撐項(xiàng)目(1104FKCA116)
【分類(lèi)號(hào)】：P588.121
【正文快照】： 柴北緣構(gòu)造帶位于青藏高原東北部、南祁連地體和柴達(dá)木地塊結(jié)合部位,南北以柴北緣深斷裂和拉脊山—中祁連南緣斷裂為界,東西端分別以哇洪山—溫泉斷裂、阿爾金斷裂為界(周賓等,2014;朱小輝等,2014)。該地區(qū)自1998年發(fā)現(xiàn)榴輝巖以來(lái),隨著研究的深入,發(fā)現(xiàn)了多種類(lèi)型的超高壓變質(zhì)，

本文編號(hào)：1345951