Stratigraphy and facies development of the marine Late Devonian near the Boulongour Reservoir, northwest Xinjiang, China

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• 作者：Thomas J. Suttner ; Erika Kido ; Xiuqin Chen ; Ruth Mawson ; Johnny A. Waters ; Ji艡铆 Fr媒da ; David Mathieson ; Peter D. Molloy ; John Pickett ; Gary D. Webster ; Barbora Fr媒dov谩
• 关键词：Late Devonian ; Stratigraphy ; Facies ; Biodiversity ; Geochemistry ; Biotic events
• 刊名：Journal of Asian Earth Sciences
• 出版年：5 February, 2014
• 年：2014
• 卷：80
• 期：Complete
• 页码：101-118
• 全文大小：6902 K

文摘

Late Devonian to Early Carboniferous stratigraphic units within the 鈥榋hulumute鈥?Formation, Hongguleleng Formation (stratotype), 鈥楬ebukehe鈥?Formation and the Heishantou Formation near the Boulongour Reservoir in northwestern Xinjiang are fossil-rich. The Hongguleleng and 鈥楬ebukehe鈥?formations are biostratigraphically well constrained by microfossils from the latest Frasnian linguiformis to mid-Famennian trachytera conodont biozones. The Hongguleleng Formation (96.8 m) is characterized by bioclastic argillaceous limestones and marls (the dominant facies) intercalated with green spiculitic calcareous shales. It yields abundant and highly diverse faunas of bryozoans, brachiopods and crinoids with subordinate solitary rugose corals, ostracods, trilobites, conodonts and other fish teeth. The succeeding 鈥楬ebukehe鈥?Formation (95.7 m) consists of siltstones, mudstones, arenites and intervals of bioclastic limestone (e.g. 鈥楤lastoid Hill鈥? and cherts with radiolarians. A diverse ichnofauna, phacopid trilobites, echinoderms (crinoids and blastoids) together with brachiopods, ostracods, bryozoans and rare cephalopods have been collected from this interval. Analysis of geochemical data, microfacies and especially the distribution of marine organisms, which are not described in detail here, but used for facies analysis, indicate a deepening of the depositional environment at the Boulongour Reservoir section. Results presented here concern mainly the sedimentological and stratigraphical context of the investigated section. Additionally, one Late Devonian palaeo-oceanic and biotic event, the Upper Kellwasser Event is recognized near the section base.