摘要
通过对新疆阿尔泰南缘东段地区主要构造带变形岩石的X光岩组分析,认为该区岩石变形比较强烈,石英变形机制以中低温底面型或近底面型滑移为主,部分为中高温柱面Ⅰ型滑移系。属于中浅—中等层次(10～15km,T=300～450℃,p=0.25～0.40GPa)的韧脆性—韧性变形。达拉维孜-阿热勒托别剪切流变构造带和库尔提-玛因鄂博韧性剪压变形带变形的物理化学条件相似,结合区域地质分析,这2个带与萨尔布拉克-科克萨依脆性挤压劈理化带一起可能组成一个完整的板块(微陆块)聚合变形带。而锡泊渡(635水库)-富蕴变晶糜棱岩带岩石变形的条件明显不同,温度压力偏高,说明其具有不同的演化历史,可能为古生代期间被强烈改造的具有前震旦纪结晶基底的微大陆的残留。
Based on an X-ray petrofabric analysis of deformed rocks in the main structural belt in the east segment of the southern margin of the Ahay Mountains, Xinjiang, the authors draw the following conclusions： （1） the rock deformation in the area is relatively strong; （2） quartz is mainly deformed along its basal or near--base glide system at medium and low temperatures and partly along its prismatic I -type glide system at medium and high temperatures; （3） the ductile-brittle and ductile deformations of the rocks occur at medium-shaUow and medium levels （at depths of 10-15 km, temperatures of 300-450^（2 and pressures of 0.25-0.40 GPa）; （4） the phy^co-chemical conditions of deformation in the Dalaweizi-Areletebie shear rheomorphic belt are similar to those in the Ku＇erti-Mayin Obo ductile shear-compressive belt, and according to this fact, combined with regional geological analysis, it possible that these two belts together with the Sa＇erbulake-Kekesayi brittle compressive cleavage belt form a complete plate （microblock） convergence deformation zone; and （5） the deformation conditions of the Xibodu （635 reservoir）-Fuyun crystalloblistic mylonite belt are notably different （e.g. its temperatures and pressures are higher than those of the above-mentioned two belts）, which shows that the belt has a different geological evolution history; so it is possible that this belt might be a remnant fragment of a microblock with the pre-Sinian crystalline basement which was strongly reworked during the Paleozoic.
出处
《地质通报》
CAS
CSCD
北大核心
2007年第9期1189-1197,共9页
Geological Bulletin of China
基金
国家"305"项目(编号:2001BA609A-07-02)
中国地质调查局项目(编号:XGMBL2005005)共同资助。
关键词
X光衍射
组构分析
变形岩石
阿尔泰南缘东段
新疆
X-ray diffraction
petrofabric analysis
deformed rocks
eastern segment of the southern margin of the AltayMountains, Xinjiang
