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 Desert | Desert |
Red Sea | Governorate |
Egypt | Country |
Latitude & Longitude (WGS84): | 27° 39' North , 33° 35' East | |||||||||
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Latitude & Longitude (decimal): | 27.65000,33.58333 | |||||||||
GeoHash: | G#: sszvk1w8u | |||||||||
KΓΆppen climate type: | BWh : Hot deserts climate | |||||||||
Nearest Settlements: |
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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 Plate | Tectonic Plate |
Select Mineral List Type
Standard Detailed Strunz Dana Chemical ElementsDetailed Mineral List:
β 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. |
β 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. |
β 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. |
β 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. |
β 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 | |||
---|---|---|---|
β | Sulphur | 1.CC.05 | S8 |
Group 5 - Nitrates and Carbonates | |||
β | Aragonite | 5.AB.15 | CaCO3 |
β | Calcite | 5.AB.05 | CaCO3 |
β | Dolomite | 5.AB.10 | CaMg(CO3)2 |
Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
β | Anhydrite | 7.AD.30 | CaSO4 |
List of minerals arranged by Dana 8th Edition classification
Group 1 - NATIVE ELEMENTS AND ALLOYS | |||
---|---|---|---|
Semi-metals and non-metals | |||
β | Sulphur | 1.3.5.1 | S8 |
Group 14 - ANHYDROUS NORMAL CARBONATES | |||
A(XO3) | |||
β | Calcite | 14.1.1.1 | CaCO3 |
AB(XO3)2 | |||
β | Dolomite | 14.2.1.1 | CaMg(CO3)2 |
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES | |||
AXO4 | |||
β | Anhydrite | 28.3.2.1 | CaSO4 |
Unclassified Minerals, Mixtures, etc. | |||
β | Aragonite | - | CaCO3 |
List of minerals for each chemical element
C | Carbon | |
---|---|---|
C | β Calcite | CaCO3 |
C | β Dolomite | CaMg(CO3)2 |
C | β Aragonite | CaCO3 |
O | Oxygen | |
O | β Calcite | CaCO3 |
O | β Dolomite | CaMg(CO3)2 |
O | β Anhydrite | CaSO4 |
O | β Aragonite | CaCO3 |
Mg | Magnesium | |
Mg | β Dolomite | CaMg(CO3)2 |
S | Sulfur | |
S | β Sulphur | S8 |
S | β Anhydrite | CaSO4 |
Ca | Calcium | |
Ca | β Calcite | CaCO3 |
Ca | β Dolomite | CaMg(CO3)2 |
Ca | β Anhydrite | CaSO4 |
Ca | β Aragonite | CaCO3 |
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: ThiΓ©blemont, 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