Primary gypsum nodules in a modern sabkha on the Mediterranean coast of Egypt

West, Ian M.; Ali, Yehia A.; Hilmy, M. Ezzeldin

doi:10.1130/0091-7613(1979)7<354:pgniam>2.0.co;2

Cited by 52 publications

(30 citation statements)

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“…Water of relatively low total dissolved solids enters the sabkha by lateral flow at the continental boundary, and relatively dilute seawater is trapped at the distal end (most easterly samples). Calcium and sulphate ions are also elevated in this zone and appear to be derived from the dissolution of the pre-existing gypsum beneath the surface, a trend seen elsewhere in sabkhas (West et al, 1979). The area is the original sabkha-aquifer modified by contributions seeping from the underlying continental brine.…”

Section: Discussionmentioning

confidence: 94%

Stable isotope (chlorine, hydrogen and oxygen), geochemical and field evidence for continental fluid flow vectors in the Al-Khiran sabkha (Kuwait)

Duane

Al-Zamel

Eastoe

2004

Journal of African Earth Sciences

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Section: Discussionmentioning

confidence: 94%

Stable isotope (chlorine, hydrogen and oxygen), geochemical and field evidence for continental fluid flow vectors in the Al-Khiran sabkha (Kuwait)

Duane

Al-Zamel

Eastoe

2004

Journal of African Earth Sciences

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“…3). In terms of their size, shape, and packing, they are sim ilar or identical to both anhydrite and gypsum nodules that are present in modern sabkhas (Kinsman, 1966;Butler, 1970;West et al, 1979). No evidence was found within any gypsum nod ules of pseudomorphs or relict mineral cores that would indicate a precursor mineral (such as anhydrite) to the gypsum (Hardie, 1984;Hardie et al, 1985).…”

Section: Description and Interpretationmentioning

confidence: 91%

“…Most of the characteristics of modem supratidal sediments in the Persian Gulf (Fig. 7) and the coast of Egypt (West et al, 1979) are present in unit B (Fig. 3).…”

Section: Unit Bmentioning

confidence: 99%

Peritidal carbonates and evaporative drawdown: A case study from the Silurian Tymochtee Dolomite, Ohio

Kahle¹,

Livchak²

1996

Basement and Basins of Eastern North America

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Dolomite containing abundant gypsum and anhydrite is common in the SilurianTymochtee Dolomite in the Ohio basin in northern Ohio. Comparative stratigraphic and sedimentologic evidence involving modern coastal sabkhas and the Tymochtee Dolomite at Celotex quarry near Gypsum, Ohio, and in the subsurface in northern Ohio, indicates a comparable environment for the Tymochtee Dolomite. In contrast, the Tymochtee Dolomite located in a Silurian shelf setting in western Ohio is a car bonate tidal flat unit with few or no evaporites. These and other differences between the Tymochtee Dolomite in western Ohio and in northern Ohio are explainable using a sequence stratigraphy evaporative drawdown (SED) model. In this model the Tym ochtee Dolomite is the result of two episodes of sea-level highstand and three episodes of sea-level lowstand brought about by evaporative drawdown in the Ohio basin. Each highstand event resulted in prograding tidal flat sedimentation in western Ohio. Each lowstand event resulted in sabkha sedimentation along the western margin of the Ohio basin in northern Ohio. The Tymochtee Dolomite at Celotex quarry is inferred to have formed during the third and last interval of sea-level lowstand. The SED model, the first of its kind ever proposed for the Tymochtee Dolomite, provides a framework for future observations and interpretations of this unit.

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“…Although not diagnostic in itself, the way silica manifests itself in the succession is consistent with overprinting of calcium sulfates. These different features are commonly present in arid coastlines, where the coupling of high evaporation and low precipitation rates results in the formation of sulfate nodules (Kinsman, 1969;West et al, 1979). The close resemblance of sub-millimetric spherulites to evaporite rosettes, and their presence in unfossiliferous dolomicrite is also suggestive of formation in an evaporative, supratidal environment (see SMF 23 of Flügel, 2004).…”

Section: Ranchester Limestone Member (Amsden Formation) and Tensleep mentioning

confidence: 94%

Impact of continental motion and dynamic glaciations on low-latitude climate during the Carboniferous: The record of the Wyoming Shelf (Western United States)

Blanchard

Fielding

Frank

2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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The dynamic character of the Late Paleozoic Ice Age is evident from glacial deposits, but its impact on tropical climate is not well constrained. Global changes in climate are overprinted on longer-term paleogeographic variations, resulting in a complex time-space distribution of climate-sensitive lithologies. The significance of such lithologies in Carboniferous successions of the western United States has not been fully explored. In this study, we provide new interpretations for the paleoclimatic context of the Amsden and Tensleep Formations (Pennsylvanian, Northern Wyoming, USA). The Amsden Formation consists of a basal sandstone member overlain by red siltstones containing pisolites. Very large-scale (~10 m) cross-bedding within the basal sandstone indicates deposition in an erg environment. Iron pisoid-rich layers in the overlying member suggest an evolution toward more humid conditions. Persistent arid conditions during the middle Pennsylvanian are suggested by eolian sandstones and calcretes in the overlying Tensleep Formation. These formations were deposited on the karst topography that developed on top of the lower to middle Mississippian Madison Group. Although the development of karstic features implies that humid conditions prevailed during the late Mississippian, evaporites and evidence for early dolomitization within the formation suggest that it was deposited under arid conditions. These relationships argue for a long-term climate evolution from arid to humid during the Mississippian, and a return to arid conditions during the Pennsylvanian. This trend can be explained by the northward drift from 15°S to~12°N. A comparison with contemporaneous records reveals a diachronous evolution across western Pangaea, with the climatic conditions documented on the Wyoming Shelf being reached later in eastern North America. These relationships indicate that plate motion considerably overprints long-term climatic records. Departures from this trend, suggested by the presence of erg deposits in the basal Amsden Formation, record the overprinting of shorter periods of climate change.

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Primary gypsum nodules in a modern sabkha on the Mediterranean coast of Egypt

Cited by 52 publications

References 0 publications

Stable isotope (chlorine, hydrogen and oxygen), geochemical and field evidence for continental fluid flow vectors in the Al-Khiran sabkha (Kuwait)

Stable isotope (chlorine, hydrogen and oxygen), geochemical and field evidence for continental fluid flow vectors in the Al-Khiran sabkha (Kuwait)

Peritidal carbonates and evaporative drawdown: A case study from the Silurian Tymochtee Dolomite, Ohio

Impact of continental motion and dynamic glaciations on low-latitude climate during the Carboniferous: The record of the Wyoming Shelf (Western United States)

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