Title: Microfacies and Facies Analysis of the Ordovician Carbonates in the South Margin of the Ordos Basin
Abstract: Ordovician carbonate rocks are well-developed and various depositional types can be recognized in the Pingliang-Jingyang-Yaoxian area,which is located in the south margin of the Ordos Basin.Based on the observation at the outcrop and indoor microfacies analysis,10microfacies can be divided,as Pingliang has9species,Jingyang has 9species and Yaoxian has 6species.According to these microfacies' features of the vertical and horizontal combination and reference Wilson's(1975)carbonate sedimentary facies model,5sedimentary facies belts can be summarized according to the microfacies combinate as restricted platform,open platform,slope facies,sloped footing and deep shelf.The combination characteristics of the sedimentary facies belts indicate that there are several transgression to regression occurred during the Ordovician.The comparison of sedimentary facies of Ordovician System in the study area indicate that sea shallowed from west to east,which can be infer that Majiagou Formation transgression direction from south to the north.In the deposition of the Pingliang Formation,regression occurred the whole Ordos Basin,but the water in the south margin of the Ordos Basin had suddenly deepened.And regression in this member occured at deposition of Beiguoshan Formation.That's may be related to Qin Lingyang's evolution.
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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Cited By Count: 3
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