摘要
西天山西段特克斯地区乌什布拉克岩体,总体呈东西向椭圆状,面积约51.2km2。按岩石谱系单位划分为:一单元中粒黑云英云闪长岩、二单元中粒含黑云花岗闪长岩和三单元中细粒含黑云二长花岗岩,合并为———乌什布拉克序列。同位素测年(单颗粒锆石U-Pb)为296±31Ma。它们在岩石学、岩石化学、地球化学特征上具有明显的同源岩浆演化的特征。地球化学特征显示具有后碰撞花岗岩的特征,表明在晚石炭世西天山已进入陆内拉张演化阶段。
In west section of Western Tianshan, Wushibulake rock mass strides west- east as an ellipticity with the cover of 51.2km^2. According to rock hierarchical unit, it is divided into such 3 units, unit Ⅰ as medium grain biotite greisen diorite, UnitⅡ as medium grain granodiorite with biotite and unit Ⅲ as fine grain mon- zonitic with biotite, which are called Wushibulake sequence. They have the characteristics of homologous evolution on petrology, petrochemistry and geochemistry. The features of post - collisional granitoids show that Western Tianshan was in the intra - continental stretching stage in late Carboniferous Period.
出处
《甘肃地质》
2006年第1期29-35,共7页
Gansu Geology
关键词
新疆特克斯地区
岩石地球化学特征
晚石炭世
构造环境
Takesi, Xinjiang
Geochemical Characterislics
Late Carboniferous Period
Structure evironment
