气候变化领域集成服务门户(CCPortal): Sedimentological and ichnological signatures of an offshore-transitional hyperpycnal system (Upper Miocene; Betic Cordillera; southern Spain)

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DOI	10.1016/j.palaeo.2020.110039
	Sedimentological and ichnological signatures of an offshore-transitional hyperpycnal system (Upper Miocene; Betic Cordillera; southern Spain)
	García-García F.; Rodríguez-Tovar F.J.; Poyatos-Moré M.; Yeste L.M.; Viseras C.
发表日期	2021
ISSN	0031-0182
卷号	561
英文摘要	Hyperpycnal flows have been widely described in different lacustrine and marine environments but sedimentary structures and fossil content in hyperpycnites often offer limited information about the palaeoenvironmental conditions. This limitation can be improved by ichnological analysis, which has been recently used as a tool to differentiate between different type of subaqueous deposits, even though still only a few detailed ichnological studies on hyperpycnites exist. In order to bridge this gap in knowledge, a 50 m-thick package of terrestrial organic debris-rich, dominantly structureless and well-sorted sandstone bodies alternating with burrowed siltstones (Upper Miocene, Betic Cordillera, Spain) is here analyzed. This study is based on observations of a well-exposed outcrop and cores from a well drilled just behind the outcrop to bridge field-scale observational gaps. Two type of sandbodies were typified on the basis of their stratigraphic architecture, physical sedimentary structures, and ichnofacies in the fine-grained deposits embedding them: (1) Lobate to channelized-top sandstones embebbed into silty sands with dominant highly variable degree of bioturbation by Taenidium and Schaubcylindrichnus (depauperate Cruziana ichnofacies) and interpreted as proximal marine sustained hyperpycnites in prodelta settings; and (2) channelized-lobate (cut-and-fill sequence) sandstones embebbed into siltstones with dominant Nereites and Phycosiphon (Nereites ichnofacies) interpreted as distal hyperpycnites developed in offshore settings. The studied succession is interpreted to represent the progradation of a sandy hyperpycnal system along a prodelta to starved offshore setting with high variability in grain-size, benthic food and oxygen content. Results of this study suggest that a multi-scale analysis focused on trace fossils and physical sedimentary signatures is needed to get a better understanding of these river-derived sustained-flow turbidites (hyperpycnites) that are less well known than their conventional surge-type turbidite counterparts. © 2020
英文关键词	Core analysis; Hyperpycnite; Prodelta; Trace fossils
语种	英语
scopus关键词	benthos; bioturbation; dominance; grain size; ichnofacies; ichnology; oxygen; progradation; sedimentology; siltstone; starvation; succession; Betic Cordillera; Spain; Cruziana; Nereites; Taenidium
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150262
作者单位	Departamento de Estratigrafía y Paleontología, Universidad de Granada, Spain; Department of Geosciences, University of Oslo, Norway
推荐引用方式 GB/T 7714	García-García F.,Rodríguez-Tovar F.J.,Poyatos-Moré M.,et al. Sedimentological and ichnological signatures of an offshore-transitional hyperpycnal system (Upper Miocene; Betic Cordillera; southern Spain)[J],2021,561.
APA	García-García F.,Rodríguez-Tovar F.J.,Poyatos-Moré M.,Yeste L.M.,&Viseras C..(2021).Sedimentological and ichnological signatures of an offshore-transitional hyperpycnal system (Upper Miocene; Betic Cordillera; southern Spain).Palaeogeography, Palaeoclimatology, Palaeoecology,561.
MLA	García-García F.,et al."Sedimentological and ichnological signatures of an offshore-transitional hyperpycnal system (Upper Miocene; Betic Cordillera; southern Spain)".Palaeogeography, Palaeoclimatology, Palaeoecology 561(2021).