Title: Petrological-geochemical characteristics of coarse-grained clastic sedimentary rocks of Quantou Formation,Cretaceous in Songliao basin and their geological significance
Abstract: Clastic sedimentary rocks of Quantou Formation,Cretaceous in Qing-an area,Songliao basin are mainly composed of sandstone,mudstone and siltstone.The petrological-chemical analysis of clastic sedimentary rocks from Quantou Formation,Cretaceous indicates that their lithology mainly consists of arkose,shale and minor rock debris sandstone and greywacke by chemical classification of bulk elements.REE distribution pattern displays the apparent enrichment of LREE and negative anomaly of Eu and is similar to that of NASC and PAAS.The ratio of trace-element in sedimentary rocks to that of upper crust shows gentle character.All the above features indicate that these sedimentary rocks were slowly deposited under weakly active tectonic setting.They are sediments typical for passive continental margin and active continental margin.It is suggested that material source of clastic sediments of Quantou Formation,Cretaceous in Qing-an area,Songliao basin was originated from Hercynian granite of Zhangguangchai Mountain,and the granite was originated from upper crust.
Publication Year: 2005
Publication Date: 2005-01-01
Language: en
Type: article
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