青海赛什腾山早古生代花岗岩地球化学特征及意义

发布时间：2017-12-28 12:15

  本文关键词：青海赛什腾山早古生代花岗岩地球化学特征及意义　出处：《矿物岩石地球化学通报》2016年05期 　论文类型：期刊论文

  更多相关文章： Ⅰ型花岗岩 地球化学 岛弧 赛什腾山

【摘要】：为揭示柴北缘复杂的构造演化特征,用X射线荧光光谱(XPF)、电感耦合等离子质谱(ICP-MS)等方法对赛什腾山花岗闪长岩、花岗岩和二长花岗岩进行了系统的全岩地球化学与微量元素研究。结果表明,赛什腾山岩体富含Si O2(64.23%~71.56%)、Al2O3(14.03%~18.36%);K2O/Na2O值平均为0.48,具准铝质-弱过铝质、钙碱性特征;岩石相对富集Th、U、Sr,亏损Ta-Nb、Ti、Pb;稀土总量变化幅度较大(74.29×10-6~169.11×10-6),轻重稀土分馏明显,弱Eu负异常特征;主微量元素图解及对比分析显示出Ⅰ型花岗岩特点。结合其他资料,可以认为赛什腾山岩体形成于岛弧环境,是地幔上侵混染了大陆地壳形成的产物,该花岗岩侵位时南祁连洋尚未闭合。
[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.
【作者单位】： 西北师范大学地理与环境科学学院;中国地质大学(武汉)地理科学与资源学院;
【基金】：国家自然科学基金项目(41262001) 甘肃省科技支撑项目(1104FKCA116)
【分类号】：P588.121
【正文快照】： 柴北缘构造带位于青藏高原东北部、南祁连地体和柴达木地块结合部位,南北以柴北缘深断裂和拉脊山—中祁连南缘断裂为界,东西端分别以哇洪山—温泉断裂、阿尔金断裂为界(周宾等,2014;朱小辉等,2014)。该地区自1998年发现榴辉岩以来,随着研究的深入,发现了多种类型的超高压变质，

本文编号：1345951