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Ras Gemsa, Al Bahr al Ahmar, Eastern Desert, Red Sea, Egypti
Regional Level Types
Ras Gemsa- not defined -
Al Bahr al Ahmar- not defined -
Eastern DesertDesert
Red SeaGovernorate
EgyptCountry

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Key
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Latitude & Longitude (WGS84): 27° 39' North , 33° 35' East
Latitude & Longitude (decimal): 27.65000,33.58333
GeoHash:G#: sszvk1w8u
Köppen climate type:BWh : Hot deserts climate
Nearest Settlements:
PlacePopulationDistance
El Gouna15,000 (2016)29.9km
Hurghada95,622 (2014)49.2km


Biogenic dolomite, calcite, and native sulphur, formed by the action of sulphate-reducing bacteria on evaporites, including anhydrite, overlying mid-Miocene hydrocarbon-bearing strata. The hydrocarbons might have been the reducing agents in view of the occurrence of petroleum at depth.

The sulfur occurs in an uplifted horst block consisting of evaporite-carbonate rocks overlying the middle Miocene oil- and gas-bearing strata. The evaporite deposits are interpreted to be a composite sequence that includes deposits of shallow lagoonal (subaqueous) and supratidal (sabkha) environments.

The sulphur occurs as fine disseminations in Miocene anhydrite and in more coarsely crystalline form in fissures and cavities in anhydritic dolomite and in interstices between rosettes of eucrystalline aragonite. The aragonite layers overlie anhydrite and thus occupy an anomalous position in the normal evaporite sequence.

Regions containing this locality

African PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


5 valid minerals.

Detailed Mineral List:

Anhydrite
Formula: CaSO4
Reference: Schnellmann, G.A. (1959) Formation of sulfur by reduction of anhydrite at Ras Gemsa, Egypt. Economic Geology: 54(5)(August, 1959): 889-894.
Aragonite
Formula: CaCO3
Habit: Eucrystalline rosettes
Reference: Schnellmann, G.A. (1959) Formation of sulfur by reduction of anhydrite at Ras Gemsa, Egypt. Economic Geology: 54(5)(August, 1959): 889-894.
Calcite
Formula: CaCO3
Reference: Youssef, E.L. & Sayed, A.A. (1988) Journal of the Japan Association of Mineralogists, Petrologists and Economic Geologists, 83, 296-307.
Dolomite
Formula: CaMg(CO3)2
Reference: Youssef, E.L. & Sayed, A.A. (1988) Journal of the Japan Association of Mineralogists, Petrologists and Economic Geologists, 83, 296-307.
Sulphur
Formula: S8
Description: Occurs in cavities in anhydritic dolomite.
Reference: Youssef, E.L. & Sayed, A.A. (1988) Journal of the Japan Association of Mineralogists, Petrologists and Economic Geologists, 83, 296-307.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Sulphur1.CC.05S8
Group 5 - Nitrates and Carbonates
Aragonite5.AB.15CaCO3
Calcite5.AB.05CaCO3
Dolomite5.AB.10CaMg(CO3)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Anhydrite7.AD.30CaSO4

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Semi-metals and non-metals
Sulphur1.3.5.1S8
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
AB(XO3)2
Dolomite14.2.1.1CaMg(CO3)2
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Anhydrite28.3.2.1CaSO4
Unclassified Minerals, Mixtures, etc.
Aragonite-CaCO3

List of minerals for each chemical element

CCarbon
C CalciteCaCO3
C DolomiteCaMg(CO3)2
C AragoniteCaCO3
OOxygen
O CalciteCaCO3
O DolomiteCaMg(CO3)2
O AnhydriteCaSO4
O AragoniteCaCO3
MgMagnesium
Mg DolomiteCaMg(CO3)2
SSulfur
S SulphurS8
S AnhydriteCaSO4
CaCalcium
Ca CalciteCaCO3
Ca DolomiteCaMg(CO3)2
Ca AnhydriteCaSO4
Ca AragoniteCaCO3

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Quaternary
0 - 2.588 Ma



ID: 3306573

Age: Pleistocene (0 - 2.588 Ma)

Lithology: Sedimentary

Reference: Thiéblemont, D. (ed.). New edition of the 1:10,000,000 geological map of Africa. CGMW-BRGM. [190]

Quaternary
0 - 2.588 Ma



ID: 3188831
Cenozoic sedimentary rocks

Age: Pleistocene (0 - 2.588 Ma)

Lithology: Sandstone-siltstone

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Schnellmann, G.A. (1959) Formation of sulfur by reduction of anhydrite at Ras Gemsa, Egypt. Economic Geology, 54(5) (August 1959), 889-894.
Youssef, E.L. and Sayed, A.A. (1988) Journal of the Japan Association of Mineralogists, Petrologists and Economic Geologists, 83, 296-307.
Youssef, E.L. and Sayed, A. A. (1989) Geology and genesis of sulfur deposits at Ras Gemsa area, Red Sea coast, Egypt. Geology, 17(9), 797.


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