Biota and palaeoecology of the Upper Ordovician Lianglitag Formation in Lunnan Oil Field, Xinjiang, NW ChinaZhang Yuanyuan1, Wang Guan2, Zhang Yunfeng3, Li Yue1*
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Abstract:
Total 19 drilling cores from the Upper Ordovician Lianglitag Formation in Lunnan Oil Field of northern Tarim Block are analyzed as limestone-dominated sequences in a westward deeping ramp of epicontinental sea. Calcimicrobes of the Renalcis, Girvanella，Wetheredella，Garwoodia，Phacelophyton yushanensis，Hedstroemia？and Halysis；calcareous algae of the Vermiporella, Dasyporella, Plexavaria，Solenopora as well as metazoan fauna of the sponge, coral, bryozoan, trilobite, brachiopod, echiodermata, gastropod, ostracoda are of the roles of the biotic components in diverse bioclastic limestones. Palaeoecological correlations along wells show that western ramp was favorable for growth of reefs and lime mudmound. Intra-platform in the eastern part is dominated by diverse intra-clastic banks. Seascape changes with westward deeper marine-floor are considered as the key roles in configurations of the temporal and spatial distribution patterns of the ecological associations.
