Section 2 EVAPORITES OF COASTAL SABKHAS

Shearman, D. J.

doi:10.2110/scn.78.01.0006

Cited by 61 publications

(67 citation statements)

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“…Its first appearance is normally in the intertidal-supratidal deposits beneath the microbial mat and then as a mush of small crystals which overlie the latter. Scattered larger crystals (desert-rose type) are common in the wind-blown sands exposed on the inner parts of the sabkha (Kinsman, 1966;Butler, 1970;Bush, 1973;Shearman, 1978Shearman, , 1980Shearman, , 1981. Other gypsum crystals, often turbid with inclusions, occur beneath and within the intertidal microbial mats; the latter, as pointed out by Illing (1963), appear to be secondary and are bi-products of the dolomitization of aragonitic mud (Illing et al, 1965;Illing & Taylor, 1993).…”

Section: Anhydrite Gypsum Bassanite and Other Evaporite Mineralsmentioning

confidence: 99%

An historical review of the Quaternary sedimentology of the Gulf (Arabian/Persian Gulf) and its geological impact

Evans

2010

Quaternary Carbonate and Evaporite Sedimentary Facies and Their Ancient Analogues

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The Arabian Gulf is a foreland basin that lies between the Arabian Shield and the Zagros fold belt. Today, it is being infilled at its northern head by the Tigris-Euphrates-Karun delta, receives further detrital sediment from Iran on its NE flank, and along its Arabian flank is the site of carbonate and evaporite sedimentation. Other than a few preliminary surveys by officers of the Indian Geological Survey and other minor geological studies associated with archaeological excavations on the Mesopotamian Plains, prior to the 1950s the Quaternary deposits of the region received little attention. However, since the publication of pioneering sedimentological studies in the late 1950s and early 1960s, these sediments have attracted considerable interest. Today, the Arabian Gulf is quoted as a model for foreland basin sedimentation, carbonate evaporite-dune-fan associations and carbonate ramps. It has become a classic area for open-water spontaneous precipitation of calcium carbonate (whitings), formation of hardgrounds, ooid production, dolomite precipitation and, most famously, for the development of shallow-water carbonate-evaporite associations. The surprise discovery of anhydrite forming in the supratidal coastal plain sediments and not in the subaqueous environment of the Gulf had a profound effect on interpretations of ancient evaporites. This discovery caused considerable re-examination and reconsideration of these deposits.

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Section: Anhydrite Gypsum Bassanite and Other Evaporite Mineralsmentioning

confidence: 99%

An historical review of the Quaternary sedimentology of the Gulf (Arabian/Persian Gulf) and its geological impact

Evans

2010

Quaternary Carbonate and Evaporite Sedimentary Facies and Their Ancient Analogues

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“…The origin is inferred on the basis of their sedimentary characteristics and relations with adjoining deposits (that is, vertical sequence). Comparison of these features with those reported from several known modern and ancient environments suggests deposition in a peritidal complex somewhat similar to the arid, seamarginal sabkas of the Persian Gulf (Kinsman, 1969;Purser and Evans, 1973;Shearman, 1978;and Kendall, 1979). …”

Section: Discussionmentioning

confidence: 54%

“…The "chicken-wire" and enterolithic structures of the nodular anhydrite, along with its crystal fabric and close association with laminated and algal dolomicrites strongly suggests an arid supratidal (sabkha) origin (Shearman, 1978;Till, 1978;Kendall, 1979). The anhydrite was precipitated from interstitial brines within the host sediment, and thus represents a diagenetic product formed beneath the sabkha surface rather than a primary precipitate formed on the sabkha surface (Murray, 1964).…”

Section: Discussionmentioning

confidence: 99%

Relationship of porosity and permeability to petrology of the Madison Limestone in rock cores from three test wells in Montana and Wyoming

Thayer¹

1983

Professional Paper

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“…5). However, nodular textures probably involve a complex historyofdiagenetic growth and displacement (Shearman, 1978(Shearman, , 1983West, 1965West, , 1975West, , 1979 related to burial dehydration ofgypsumto anhydrite. The later rehydration to gypsum by near-surface groundwaters, during postPleistocene uplift/erosion, created the displacement and radial tension cracks in the dolomitic units enclosing the thin gypsum/anhydrite beds of cycles 2 and 3; and, also, may have resulted in many of the displacement textures (hassocks, dolomite wisps and nodules) in the Main Gypsum bed, as shear textures are evident in displacement nodules.…”

Section: Discussionmentioning

confidence: 99%