干旱区生态环境知识资源中心(Arid): A Middle-Late Pleistocene palustrine-lacustrine-travertine system (Borj Edouane Unit, NW Tunisia): sedimentology, stable isotopes, and palaeohydrological implications

Arid

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, Naoufel 1; Recio, Clemente 2; Armenteros, Ildefonso 2; Azizi, Ramzi 3; Regaya, Kamel 1
通讯作者	Armenteros, Ildefonso
来源期刊	INTERNATIONAL JOURNAL OF EARTH SCIENCES
ISSN	1437-3254
EISSN	1437-3262
出版年	2020
卷号	109 期号:1 页码:221-238
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 delta O-18 values around - 5.8 +/- 0.5 parts per thousand, suggesting formation from paleoprecipitation largely of Atlantic derivation, brought about by westerly winds. As for the delta C-13 values, these show a wide range (- 6.4 to 11.7 parts per thousand), 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.
英文关键词	Stable isotopes Calcrete-palustrine carbonates Microbialites Paleoclimatology Pleistocene Tunisia
类型	Article
语种	英语
国家	Tunisia ; Spain
收录类别	SCI-E
WOS记录号	WOS:000501124500002
WOS关键词	MICROBIAL CARBONATES ; PLUVIAL EPISODES ; PASTOS-GRANDES ; WESTERN DESERT ; MADRID BASIN ; KHARGA OASIS ; GEOCHEMISTRY ; DEPOSITS ; MIOCENE ; CONSTRAINTS
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
EI主题词	2019-12-05
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311604
作者单位	1.Univ Carthage, Fac Sci Bizerte, Zarzounza 7021, Tunisia; 2.Salamanca Univ, Fac Sci, Dept Geol, Salamanca 37071, Spain; 3.Univ Gafsa, Fac Sci Gafsa, Dept Earth Sci, Gafsa 2112, Tunisia
推荐引用方式 GB/T 7714	Ghannem, Naoufel,Recio, Clemente,Armenteros, Ildefonso,et al. A Middle-Late Pleistocene palustrine-lacustrine-travertine system (Borj Edouane Unit, NW Tunisia): sedimentology, stable isotopes, and palaeohydrological implications[J],2020,109(1):221-238.
APA	Ghannem, Naoufel,Recio, Clemente,Armenteros, Ildefonso,Azizi, Ramzi,&Regaya, Kamel.(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),221-238.
MLA	Ghannem, Naoufel,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):221-238.