西北地质
西北地質
서북지질
Northwestern Geology
2015年
4期
1-9
,共9页
西天山造山带%双变质带%变质相带%构造层次%变质%变形序列
西天山造山帶%雙變質帶%變質相帶%構造層次%變質%變形序列
서천산조산대%쌍변질대%변질상대%구조층차%변질%변형서렬
West Tianshan Orogen%paired metamorphic belt%metamorphic facies%structure lev-el%metamorphism%deformation sequence
西天山造山带中双变质带以新疆昭苏察汗乌苏一带较为典型，根据变质作用的不同，划分出绿片岩相绢云母绿泥石带、绿片岩相蓝闪石带、角闪岩相黑云母普通角闪石带、角闪岩相矽线石铁铝榴石带等变质相带；按其变质作用以及构造变形程度分为上部层次脆性性构造层、中上部层次、深部层次3种构造层次。根据之间的相互叠加关系，确立了造山带内的岩石主要存在着3期以上构造变形特征；在主要的3期构造变形过程中见有相应的变质矿物，并根据生成的矿物组合与变形之间的相互关系，通过变质矿物先后生成关系与岩石的结构、构造建立了变质与变形序列关系，确立了变质与变形非简单一一对应，而是具有渗透叠加和循环往复的特点。
西天山造山帶中雙變質帶以新疆昭囌察汗烏囌一帶較為典型，根據變質作用的不同，劃分齣綠片巖相絹雲母綠泥石帶、綠片巖相藍閃石帶、角閃巖相黑雲母普通角閃石帶、角閃巖相矽線石鐵鋁榴石帶等變質相帶；按其變質作用以及構造變形程度分為上部層次脆性性構造層、中上部層次、深部層次3種構造層次。根據之間的相互疊加關繫，確立瞭造山帶內的巖石主要存在著3期以上構造變形特徵；在主要的3期構造變形過程中見有相應的變質礦物，併根據生成的礦物組閤與變形之間的相互關繫，通過變質礦物先後生成關繫與巖石的結構、構造建立瞭變質與變形序列關繫，確立瞭變質與變形非簡單一一對應，而是具有滲透疊加和循環往複的特點。
서천산조산대중쌍변질대이신강소소찰한오소일대교위전형，근거변질작용적불동，화분출록편암상견운모록니석대、록편암상람섬석대、각섬암상흑운모보통각섬석대、각섬암상석선석철려류석대등변질상대；안기변질작용이급구조변형정도분위상부층차취성성구조층、중상부층차、심부층차3충구조층차。근거지간적상호첩가관계，학립료조산대내적암석주요존재착3기이상구조변형특정；재주요적3기구조변형과정중견유상응적변질광물，병근거생성적광물조합여변형지간적상호관계，통과변질광물선후생성관계여암석적결구、구조건립료변질여변형서렬관계，학립료변질여변형비간단일일대응，이시구유삼투첩가화순배왕복적특점。
The paired metamorphic belt of West Tianshan Orogen is more typical in Chahanwusu Area,Xinjiang. According to the difference of metamorphism,this paired metamorphic belt can be divided into several metamorphic facies zone,including sericite-chlorite zone with greeanschist-facies,glaucophane zone with greenschist facies,biotite-hornblende zone with amphibolite facies belt and sillimanite-almandite zone with amphibolite facies. Based on the degree of metamorphism and tectonic deformation,this paired metamorphic belt can be divided into three kinds of structur-al levels:the brittle structural layer in the upper level,the structural layers in the middle-upper level and the ones in the lower level. After analyzing the superimposed relationship among these structural levels,more than threetimes of tectonic deformation characteristics have been distin-guished in the rocks of West Tianshan Orogen. And the corresponding metamorphic minerals for these three tectonic stages in the process of deformation can be observed. And then,the interre-lationship between generated mineral association and deformation has been discussed,the rela-tionship between metamorphism and deformation sequence has been established according on ana-lyzing the produce order of metamorphic mineral,the rocks’textures and tectonic. Finally,it’s certain that the relationship between metamorphism and deformation is not a simple one-to-one relationship,but has the characteristics of penetration superposition and circulation.
