新疆阿克陶县恰尔隆南不整合面的发现

The Discovery of the Unconformity on Upper Carboniferous in the Southern Qiaerlong,Akto County,Xinjiang

进行1∶5万区调工作时,发现新疆阿克陶县恰尔隆南克英组顶部存在一个不整合面,其特征主要表现为具有古风化壳与底砾岩、地层缺失及地层化学异常等。研究表明,它是震旦纪—泥盆纪由于海平面相对下降,沉积相由滨海—浅海相朝沉积盆地演化中造成沉积中断而形成的。实测剖面、填图工作、化学地层及古地理特征均反映出该界面的存在。这一发现对阐明西昆仑石炭纪层序地层格架及古地理演化具有重要意义,否定了前人区域断裂的说法。

During 15 million regional geological survey,the authors found that there was a unconformity at the top of Keying group in Qiaerlongnan.The unconformity was manifested as the paleo-weathering crust,basal conglomerate,sequence missing and strata chemical abnormal.The study shows,for sea level relative decline in Sinian-Devonian,it is caused by sedimentary interruption in sedimentary facies evolution-coastal-neritic phase to sedimentary basin.That reflects the unconformity＇s sxistent by data of measured sections,geological mapping,chemical strata and paleo-geographic framework.The discovery has important significance of elucidating sequence stratigraphic framework and evolution of paleogeography in carboniferous,west Kunlun,and denies the statement about regional fault with predecessors.