文章摘要
马晓辉,刘阳,赵亮亮,李宝,张向宁,李艳翔,张雪,宾金来,马金虎,王丽丽,祁春娜.内蒙古三道沟地区石炭纪杂岩体地球化学特征、成因及其地质意义[J].矿产勘查,2022,13(12):1733-1746
内蒙古三道沟地区石炭纪杂岩体地球化学特征、成因及其地质意义
Geochemistry characteristics, genesis and geological significance of Carboniferous complex in Sandaogou area, Inner Mongolia
投稿时间：2022-03-22  
DOI：10.20008/j.kckc.202212001
中文关键词: 地球化学  岩石成因  地质意义  三道沟杂岩体  内蒙古
英文关键词: geochemistry  petrogenesis  geological significance  Sandaogou complex  Inner Mongolia
基金项目:本文受内蒙古自治区地质勘查基金管理中心地质勘查项目“内蒙古自治区乌兰察布市三道沟等五幅1∶5万区域矿产地质调查”(NMKD2010-3-1)资助。
作者单位
马晓辉 中国冶金地质总局地球物理勘查院, 河北 保定 071051 
刘阳 中国冶金地质总局矿产资源研究院, 北京 101300 
赵亮亮 中国冶金地质总局矿产资源研究院, 北京 101300 
李宝 中国冶金地质总局第一地质勘查院, 河北 三河 065201 
张向宁 中国冶金地质总局地球物理勘查院, 河北 保定 071051 
李艳翔 中国冶金地质总局地球物理勘查院, 河北 保定 071051 
张雪 中国冶金地质总局地球物理勘查院, 河北 保定 071051 
宾金来 河北省地质工程勘查院, 河北 保定 071051 
马金虎 河北省地质工程勘查院, 河北 保定 071051 
王丽丽 河北省地质工程勘查院, 河北 保定 071051 
祁春娜 河北省地质工程勘查院, 河北 保定 071051 
摘要点击次数: 1186
全文下载次数: 417
中文摘要:
      内蒙古三道沟杂岩体位于华北陆块北缘中段,杂岩体主要可划分出中细粒闪长岩、中细粒花岗闪长岩、巨斑状花岗闪长岩、似斑状花岗闪长岩、中细粒二长花岗岩和细粒二长花岗岩。岩体相对富Si,富Na,低Fe、Mg、Ca,属高钾钙碱性岩石系列,为准铝质—弱过铝质花岗岩类,具明显I型花岗岩特征。杂岩体具有同源岩浆连续演化特征,岩体明显亏损Nb、Ta、Ti、P等高场强元素,未出现Zr、Hf、Eu、Sr、Ba的亏损,同时,岩石中Th、U与REE含量均相对较低,说明经历过俯冲流体或熔体交代的岩浆经过磷灰石、钛铁矿及榍石的分离结晶作用,连续演化依次形成了闪长岩、花岗闪长岩、似(巨)斑状花岗闪长岩、二长花岗岩。地球化学特征反映出其具有活动大陆边缘弧特征,为华北陆块北缘石炭纪火山弧的重要组成部分,形成于早石炭世晚期—晚石炭世中期(328.9±2.3)～(313.7±1.1)Ma古亚洲洋向华北陆块俯冲的活动大陆边缘弧环境。
英文摘要:
      The Sandaogou complex is located in the Middle of the northern margin of the north China Block. The complex can be divided into medium-fine grained diorite,medium-fine granodiorite, huge-porphyritic granodiorite,porphyritic granodiorite, medium-fine monzogranite and fine-grained monzogranite. The complex is relatively enriched in SiO2 and Na. Low abundance of Fe,Mg,Ca, which belongs to high potassium calc-alkaline rock series. And is metaluminous-weakly peraluminous granites. It has obvious characteristics of I-type granite. The complex is characterized by continuous evolution of homologous magma,It is obviously deficient in high field strength elements such as Nb, Ta, Ti and P. However, there is not deficient in Zr, Hf, Eu, Sr, Ba. In addition, Th, U and ΣREE are relatively low in the rocks. The specific process should be the separation and crystallization of apatite, ilmenite and sphene by magma which has experienced subduction fluid or melt metasomatism, the continuous evolution successively formed diorite,granodiorite,porphyritic(huge-porphyritic) granodiorite and monzonite.Geochemical characteristics reflect the active continental margin arc. The complex is an important part of the carboniferous volcanic arc in the northern margin of the north China Block, it was formed during the late early carboniferous and middle late carboniferous (328.9±2.3) Ma to (313.7±1.1) Ma when the paleo-Asian Ocean subducted to the north China Block.
查看全文   查看/发表评论  下载PDF阅读器
关闭