Les accumulations calcaires dans les limons de Matmata de la région de Gabès en Tunisie / Calcareous accumulations in the lœssic loams of Matmata, Gabes area, Tunisia

Regaya, Kamel

doi:10.3406/sgeol.1984.1680

Cited by 5 publications

(3 citation statements)

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“…It culminates at 713 m a.s.l. and is composed of a system of cuestas that gently incline to the west and are partly dissected by valleys and depressions filled with several-meter thick Quaternary fine sand and silt (or loess) [26][27][28][29]. Zmerten lies at an altitude of 530 m a.s.l.…”

Section: Study Areamentioning

confidence: 99%

Upstream-Downstream Influence of Water Harvesting Techniques (Jessour) on Soil Water Retention in Southeast Tunisia

Calianno

Fraj

Fallot

et al. 2023

Water

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Weather parameters and soil moisture profiles were measured at an hourly time step during four agricultural years (September to October, from 2018–19 to 2021–22) in two Jessour (water harvesting cultivated terraces) of the same valley in Zmerten (southeastern Tunisia), characterized by an arid climate. One instrumented Jesr (singular of Jessour) was located upstream and the other one downstream. During each dry season, when crops experience water stress, the downstream Jesr had a higher available water content than the upstream one; in the downstream Jesr the soil profile moisture remained above the wilting point, whereas in the upstream soil surface, moisture levels decreased to below the wilting point. High accumulation/low intensity rains (causing saturation/excess runoff) flooded both upstream and downstream Jessour from 50 mm of cumulative rainfall, whereas high intensity/low accumulation rains (causing infiltration/excess runoff) activated the downstream Jesr from an intensity of 15.2 mm/h, and a combination of moderate intensity and moderate accumulation rains activated both Jessour from an intensity of 8 mm/h and a cumulative rainfall of 33 mm. We propose to set 50 mm of cumulative rainfall and/or 6.4 mm/h of intensity as threshold values for the activation of the Jessour system in Zmerten. However, significant soil moisture recharges can occur even without activation of the Jessour system.

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Section: Study Areamentioning

confidence: 99%

Upstream-Downstream Influence of Water Harvesting Techniques (Jessour) on Soil Water Retention in Southeast Tunisia

Calianno

Fraj

Fallot

et al. 2023

Water

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“…Il s'agit notamment : A) de calcaires lacustres et palustres; B) de tufs et travertins d'origine essentiellement organique et rencontrés à proximité des sources hydrothermales; et puis C) de croûtes calcaires de type calcrète, à caractères pédologiques et diagénétiques. Les croûtes calcaires ou calcrètes, quaternaires ou anciennes (paléocroûtes éocènes), ont fait l'objet de nombreuses études tant sur le plan sédimentologique que stratigraphique, aussi bien par les géologues (JAUZEIN, 1967 ;ABDELJAOUED, 1992 ;SASSI et al, 1984 ;REGAYA, 1983REGAYA, , 1992REGAYA, , 2000 que par les pédologues (BLANCANEAUX et al, 1983 ;TOUMI, 1990, entre autres), ou encore du point de vue géomorphologique (COQUE, 1962 ;BEN OUEZDOU, 1995). En revanche, les travaux concernant les calcaires lacustres et palustres sont rares (ABDELJAOUED, 1992 ;REGAYA, 2000 ;OURARI, 2005).…”

Section: Introductionunclassified

Étude sédimentologique des dépôts carbonatés continentaux de type palustre de la région de Tajerouine, Nord-Ouest de la Tunisie

Ghannem¹

2016

Carnets Geol.

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Les calcaires palustres d'âge quaternaire (Pléistocène moyen et supérieur), objet de cette étude, se trouvent au niveau du massif El Gara Tajerouine (Nord-Ouest de la Tunisie). L'étude de ces dépôts à différentes échelles, macroscopique (description lithologique) et microscopique (pétrographie et minéralogie), montre qu'ils ont une structure tabulaire tout en reposant en discordance angulaire sur la série marno-calcaire de l'Aptien-Albien. Ces dépôts montrent également des variations latérales et verticales de faciès : conglomérats, calcaires et stromatolithes. Enfin, l'épaisseur des couches tend aussi à augmenter progressivement d'est en ouest et vers le sud de la zone d'étude. En raison de fluctuations de la nappe phréatique, ces carbonates ont subi des périodes d'inondation et d'émersion périodiques provoquant de nombreuses modifications par une pédogenèse d'émersion plus ou moins profonde (nodulisation, traces de racines, pseudo-microkarst), celles-ci influant sur les cimentations au cours de la diagenèse (alternances de ciment phréatique et vadose) qui justifient l'appellation des calcaires palustres.

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“…Texturally, both palygorskite and sepiolite are present as matrix components and as coatings on ooids, skeletal grains, root voids and circulation channels (Hay & Wiggins, 1980;Watts, 1980;Singer, 1984). With regard to the position of these minerals in a caliche (~ 1992 The Mineralogical Society profile, Aristarain (1971), Goudie (1972) and Regaya (1984) report good correlation with laminated caliche horizons, and an increase in proportion from the bottom to the top.…”

mentioning

confidence: 98%

Chemical and mineralogical characteristics of Pleistocene caliche deposits from the Central Ebro Basin, NE Spain

Sancho

Meléndez

Signes³

et al. 1992

Clay miner.

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A B S T R A C T: Chemical and mineralogical analyses of fossil caliche profiles developed on top of Lower Pleistocene alluvial formations in the East-central sector of the Ebro basin indicate that they have high content of carbonate (average 84%) and high Ca/Mg ratios (average 136). The clay mineral assemblages vary slightly depending on the host material, and, therefore, on the alluvial formation in the source area. Inherited detrital minerals (illite, kaolinite and chlorite), transformed components (from chlorite to mixed-layers of chlorite-vermiculite, and from smectite to palygorskite) and a neoformed phase (palygorskite) have been observed. The contents of carbonate and magnesian clay minerals (smectite and palygorskite) increase from the bottom to the top of the profiles, in relation to hardpan laminated caliche facies. The amount of palygorskite is controlled by the concentration of Mg 2+ which in turn depends on the absolute content of Mg 2+ in the host material and on its relative concentration by processes of evaporation linked to decreasing permeability in the profile during the biogenic-pedogenetic carbonate accumulation stages. These processes form part of the development of caliche profiles in a semi-arid environment.

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Les accumulations calcaires dans les limons de Matmata de la région de Gabès en Tunisie / Calcareous accumulations in the lœssic loams of Matmata, Gabes area, Tunisia

Cited by 5 publications

References 0 publications

Upstream-Downstream Influence of Water Harvesting Techniques (Jessour) on Soil Water Retention in Southeast Tunisia

Upstream-Downstream Influence of Water Harvesting Techniques (Jessour) on Soil Water Retention in Southeast Tunisia

Étude sédimentologique des dépôts carbonatés continentaux de type palustre de la région de Tajerouine, Nord-Ouest de la Tunisie

Chemical and mineralogical characteristics of Pleistocene caliche deposits from the Central Ebro Basin, NE Spain

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