气候变化领域集成服务门户(CCPortal): A Middle–Late Pleistocene palustrine–lacustrine–travertine system (Borj Edouane Unit; NW Tunisia): sedimentology; stable isotopes; and palaeohydrological implications

CCPortal

DOI	10.1007/s00531-019-01798-4
	A Middle–Late Pleistocene palustrine–lacustrine–travertine system (Borj Edouane Unit; NW Tunisia): sedimentology; stable isotopes; and palaeohydrological implications
	Ghannem N.; Recio C.; Armenteros I.; Azizi R.; Regaya K.
发表日期	2020
ISSN	14373254
起始页码	221
结束页码	238
卷号	109 期号:1
英文摘要	The carbonate Borj Edouane Unit represents the northernmost documented Middle–Late Pleistocene continental carbonate deposits in Tunisia. The unit consists of two main facies associations, asymmetrically distributed: (1) calcrete–palustrine–laminar crust; (2) microbialites. The first accumulated carbonate formed in the distal zone of alluvial fans (calcretes) and in shallow lakes subjected to periodic exposure (palustrine facies) that occupied the westernmost strip of the basin. The second association formed in permanent lakes (stromatolites: oncoids and planar stromatolites) located in the central areas of the basin, fed by springs associated with a concentration of vertical faults in the eastern area of the basin (travertine facies). At time of deposition, these facies communicated with the lake via a transitional lacustrine–travertine environment (transitional travertine–stromatolite facies). All facies show a restricted range of δ18O values around − 5.8 ± 0.5‰, suggesting formation from paleoprecipitation largely of Atlantic derivation, brought about by westerly winds. As for the δ13C values, these show a wide range (− 6.4 to 11.7‰), overall relatively high values for all facies, with the lower values corresponding to the calcrete–palustrine association and the higher ones linked to the microbialite facies. The trend in travertines probably mimics an increasing influence of carbon derived from dissolution of carbonate bedrock of the Cretaceous substrate, while that of palustrine samples records increasing respired-C contribution. The sedimentological and isotopic characteristics of the Borj Edouane Unit reflect wetter conditions at the time of deposition, and point to a humid period at the Middle–Late Pleistocene transition. © 2019, Geologische Vereinigung e.V. (GV).
英文关键词	Calcrete–palustrine carbonates; Microbialites; Paleoclimatology; Pleistocene; Stable isotopes; Tunisia
语种	英语
scopus关键词	facies analysis; lacustrine environment; microbialite; paleoclimate; paleohydrology; Pleistocene; sedimentology; stable isotope; travertine; Tunisia
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147735
作者单位	Faculty of Science of Bizerte, University of Carthage, Zarzounza, 7021, Tunisia; Department of Geology, Faculty of Sciences, Salamanca University, Salamanca, 37071, Spain; Department of Earth Sciences, Faculty of Sciences of Gafsa, University of Gafsa, Gafsa, 2112, Tunisia
推荐引用方式 GB/T 7714	Ghannem N.,Recio C.,Armenteros I.,等. A Middle–Late Pleistocene palustrine–lacustrine–travertine system (Borj Edouane Unit; NW Tunisia): sedimentology; stable isotopes; and palaeohydrological implications[J],2020,109(1).
APA	Ghannem N.,Recio C.,Armenteros I.,Azizi R.,&Regaya K..(2020).A Middle–Late Pleistocene palustrine–lacustrine–travertine system (Borj Edouane Unit; NW Tunisia): sedimentology; stable isotopes; and palaeohydrological implications.International Journal of Earth Sciences,109(1).
MLA	Ghannem N.,et al."A Middle–Late Pleistocene palustrine–lacustrine–travertine system (Borj Edouane Unit; NW Tunisia): sedimentology; stable isotopes; and palaeohydrological implications".International Journal of Earth Sciences 109.1(2020).