西准噶尔哈拉阿拉特组的重新厘定及区域对比

REVISION AND REGIONAL CORRELATION OF THE HALA'ALATE FORMATION IN WESTERN JUNGGAR BASIN

根据西准噶尔玛依塔巴克一带区域地质调查最新成果,对《新疆岩石地层》中中晚石炭世哈拉阿拉特组重新进行厘定,建立哈拉阿拉特组副层型剖面,修正了原哈拉阿拉特组正层型剖面的地层层序,将原正层型剖面1~6层归早石炭世包古图组,将王玉净等划归下二叠统佳木河组的大套火山岩—火山碎屑岩组合置于哈拉阿拉特组下部。厘定后的哈拉阿拉特组分为7个岩性段,时代为晚石炭世。重新厘定后的本组,正确反映了其层序、岩石组合和地层学属性,为本区石炭系研究提供了准确完整的层序和对比剖面。

On the basis of the latest 1/50000 regional geological mapping of the Mayitabake area in the western Junggar Basin,the Late Carboniferous Hala＇alate Formation is revised.A parastratotype section has been established for the Hala＇alate Formation,the original holostratotype section of the Hala＇alate Formation as defined by Wang Yu-jing et al.has been modified.The clastic rocks in units 1~6of the original holostratotype section are reassigned to the Early Carboniferous Baogutu Formation,whereas volcanic and volcaniclastic rocks in the original holostratotype section that were designated as the Lower Permian Jiamuhe Formation by Wang Yu-jing et al.are now reassigned to the lower Hala＇alate Formation.The Hala＇alate Formation of revision can be subdivided into seven members,and it is Late Carboniferous in age.