气候变化领域集成服务门户(CCPortal): Palaeoenvironmental evolution of the late Miocene palaeolake at Zahle (Bekaa Valley; Lebanon)

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DOI	10.1016/j.palaeo.2019.03.031
	Palaeoenvironmental evolution of the late Miocene palaeolake at Zahle (Bekaa Valley; Lebanon)
	Sanjuan J.; Alqudah M.; Neubauer T.A.; Holmes J.; Khairallah C.
发表日期	2019
ISSN	0031-0182
起始页码	70
结束页码	84
卷号	524
英文摘要	Neogene non-marine sedimentary rocks of the Bekaa Valley (Lebanon) are microfossil rich and show minimal lateral facies changes and post-depositional diagenetic alteration across continuous exposures. In this paper, we analyze the sedimentary facies and microfossils of three closely-spaced stratigraphic sections near the town of Zahle. The sedimentary sequence is divided, from base to top, into three intervals: (1) a massive conglomerate unit interpreted as alluvial fan deposits, (2) fossiliferous yellowish marls and limestone interpreted as perennial lacustrine deposits, and (3) an organic-rich marlstone intercalated with volcanic ash horizons interpreted as a palustrine interval representing an overall shallowing sequence. Intervals 2 and 3 contain a diverse microfossil assemblage comprising charophytes, terrestrial molluscs, a freshwater bivalve, ostracods as well as fish and mammal remains. The palaeoenvironmental characteristics and evolution of these lacustrine deposits are inferred through facies analysis and through comparison of microfossil tolerances with the ecological requirements of their nearest living relatives. Results suggest that during the Miocene the Bekaa Valley was occupied by a relatively shallow, stable, oligotrophic freshwater or slightly oligohaline lake that evolved to a very shallow eutrophic lake with a dense palustrine vegetation belt. The palaeolake ultimately regressed to the south due to climatic changes and tectonic stresses leaving the lacustrine deposits exposed in the area of Zahle as an erosional surface. © 2019 Elsevier B.V.
英文关键词	Lacustrine; Microfossil; Middle East; Neogene; Palaeoecology; Sedimentology
语种	英语
scopus关键词	biostratigraphy; eutrophic environment; facies analysis; fossil assemblage; lacustrine environment; microfossil; Miocene; oligotrophic environment; paleoecology; paleoenvironment; sedimentary sequence; sedimentology; volcanic ash; Bekaa Valley; Beqaa; Lebanon; Bivalvia; Characeae; Mammalia; Mollusca; Ostracoda
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/150978
作者单位	Department of Geology, American University of Beirut, Beirut, 11-0236, Lebanon; Department of Earth and Environmental Sciences, Yarmouk University, Irbid, 21163, Jordan; Department of Animal Ecology and Systematics, Justus Liebig University, Giessen, 35392, Germany; Naturalis Biodiversity Centre, P.O. Box 9517, Leiden, RA 2300, Netherlands; Environmental Change Research Centre, Department of Geography, University College London, London, WC1E 6BT, United Kingdom
推荐引用方式 GB/T 7714	Sanjuan J.,Alqudah M.,Neubauer T.A.,et al. Palaeoenvironmental evolution of the late Miocene palaeolake at Zahle (Bekaa Valley; Lebanon)[J],2019,524.
APA	Sanjuan J.,Alqudah M.,Neubauer T.A.,Holmes J.,&Khairallah C..(2019).Palaeoenvironmental evolution of the late Miocene palaeolake at Zahle (Bekaa Valley; Lebanon).Palaeogeography, Palaeoclimatology, Palaeoecology,524.
MLA	Sanjuan J.,et al."Palaeoenvironmental evolution of the late Miocene palaeolake at Zahle (Bekaa Valley; Lebanon)".Palaeogeography, Palaeoclimatology, Palaeoecology 524(2019).