西准噶尔克拉赛勒克山和布克河组晚泥盆世化石的发现及其地层归属

The discovery of the Late Devonian fossils from the Hebukehe Formation and its stratal position in Kelasaileke Mountain, western Junggar, Xinjiang

西准噶尔地区广泛分布的和布克河组已被证明是洪古勒楞组的晚出异名,本文在西准噶尔克拉赛勒克山原划为下石炭统“和布克河组”的碎屑岩地层中发现了丰富的动、植物化石,包括:三叶虫Phacops sp.,菊石Manticoceras sp.,腕足类Tylothyris sp.,Aulacella sp.,“Mucrospirifer”sp.,Cyrtospirifer sp.,植物Leptophloeum rhombicum,Syringodendron sp.,Knorria sp.,其时代显示为晚泥盆世。根据岩性组合特征将其厘定为上泥盆统铁列克提组,而非“和布克河组”的替代名称洪古勒楞组。通过区域地质调查工作,证明了西准噶尔玛依力山地层小区内没有洪古勒楞组的分布,其晚泥盆世地层仅由铁列克提组组成,洪古勒楞组只分布在沙尔布尔提山地层小区,两个地层小区的界线为孟布拉克北侧至谢米斯台山南坡的深大断裂。晚泥盆世两个地层小区沉积分异明显,直到早石炭世早期才进入统一的盆地演化阶段,地层小区的分区性也随之消失。

The Hebukehe Formation is widely distributed in western Junggar.It is the synonym of the Hongguleleng Formation.This paper presents abundant fossils from the clastic strata which were previously assigned to the Lower Carboniferous Hebukehe Formation in Kelasaileke Mountain,western Junggar.These fossils include trilobites Phacops sp.,ammonoids Manticoceras sp.,brachiopods Tylothyris sp.,Aulacella sp.,"Mucrospirifer"sp.and Cyrtospirifer sp.,plants Leptophloeum rhombicum,Syringodendron sp.and Knorria sp..The age of these fossils is attributed to the Late Devonian.According to the lithologic association,the fossiliferous strata are redefined as the Upper Devonian Tielieketi Formation,rather than the Hongguleleng Formation.Regional geological survey reveals that the Upper Devonian of Mayili Mountain stratomicroregion is only composed of the Tielieketi Formation,without the Hongguleleng Formation.The latter is only distributed in the Shaerbuerti Mountain stratomicroregion.The boundary of the two stratomicroregions is the deep fault located in northern Mengbulake to south slope of Xiemisitai Mountain.These two stratomicroregions experienced obvious sedimentary differentiation during the Late Devonian,and gradually evolved into the evolutional stage of uniform basin environment until the early Early Carboniferous,announcing a gradual disappearance of stratigraphic regionalization of the stratomicroregions.