内蒙古中部小南沟-明星沟地区新太古代TTG岩系及其地质意义  

Geological character and significance of Adakite and TTG in Xiaonangou-Mingxinggou district in central of Inner Mongolia

作　　者：张永清[1] 张有宽[1] 郑宝军[1] 徐国权[2] 韩建刚[1] 母吉君[3] 张履桥 

机构地区：[1]内蒙古自治区地质调查院,呼和浩特010020 [2]内蒙古自治区国土资源信息院,呼和浩特010020 [3]内蒙古巴彦淖尔市水土保持站,临河051000 [4]内蒙古自治区矿产实验研究所,呼和浩特010055

出　　处：《岩石学报》2006年第11期2762-2768,共7页Acta Petrologica Sinica

基　　金：国土资源大调查项目--中国地质调查局地质调查项目--召河庙地区1/5万区域地质调查(编号200130008031)资助

摘　　要：内蒙古中部小南沟-明星沟地区出露一套新太古代片理化石英闪长岩和片理化英云闪长岩，岩石化学成分富SiO2、Al2O3、Na2O、Ba、Sr、Mg^#和LREE，而贫Yb、Y和HREE，具有Adakite（埃达克岩）及TTG岩系的特征，空间上与新太古界色尔腾山岩群绿岩密切伴生。在石英闪长岩体中获得2组锆石U—Pb等时线年龄为2575±1Ma和2541±30Ma，是新太古代形成于板块消减带之上的洋壳部分熔融产物，对研究该地区地球早期演化和板块构造起源具有重要意义。A suit of schistositied quartz diorite and schistositied tonalite in Neoarchean, which is exposed in Xiaonangou- Mingxinggou district in central of Inner Mongolia. Petrochemical contents show that it possesses high contents of SiO2, Al2O3 , Na2 O, Ba,Sr,Mg^#,LREE and low contents of Yb,Y,HREE, and it possess the character of Adakite and TTG. It is associated intently with greenstone of Seertengshan Group Neoarchean in space distribution. The two isochronal age of zircon in quartz diorite are 2575 ± 1Ma （U-Pb） and 2541 ± 30Ma（ U-Pb）, it is formed by partial melting of ocean slab which formed on the belt of plate subduction in Neoarchean. It possesses important significance in studying early Earth evolution and origin of plate tectonics .

关 键 词：内蒙古 小南沟-明星沟 Adakite(埃达克岩) TTG岩系 石英闪长岩 英云闪长岩 

分 类 号：P588.345[天文地球—岩石学] P588.122[天文地球—地质学]