Microbial dolomites from carbonate-evaporite sediments of the coastal sabkha of Abu Dhabi and their exploration implications
Abstract
Detailed petrographic studies of Recent dolomites from the coastal sabkha of Abu Dhabi using SEM and Energy Dispersive X‐ray (EDX) analyses indicate that most of the dolomite started to form in “micro‐niches” (i.e. small isolated pore spaces) within the carbonate sediments. These micro‐niches tend to retain connate waters, becoming anoxic and supporting specific microbial activity which ultimately results in the formation of dolomite. This novel concept may help to explain the origin of many dolomite types, since recently deposited carbonate sediments have high porosities (up to 60%) and the pore spaces may serve as nucleation sites or “stations” for dolomite formation. The combination of neighbouring micro‐niches in a porous carbonate may result in dolomitization of an entire stratum. Six dolomite types were reported from the studied sediments in the Abu Dhabi sabkha. These were pustular and cluster dolomite; dolomites associated with clay minerals and with evaporites; and dolomites associated with microbial mats and foraminiferal tests.
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Crystals of dolomite often grow in pore spaces around detrital clay particles.
“crystals of dolomite often grow in pore spaces around detrital clay particles (e.g., Sadooni et al., 2010)”
From Experimental evidence for abiotic formation of low-temperature proto-dolomite facilitated by clay minerals (2019) · cites this paper as Sadooni et al., 2010
Clay minerals commonly occur in sediments of coastal sabkhas and inland saline lakes in which primary dolomite deposits have emerged.
“it has been repeatedly reported that clay minerals commonly occur in sediments of coastal sabkhas and inland saline lakes in which primary dolomite deposits have emerged”
From Experimental evidence for abiotic formation of low-temperature proto-dolomite facilitated by clay minerals (2019) · cites this paper as Sadooni et al., 2010
Cites
Microbial mediation as a possible mechanism for natural dolomite formation at low temperatures
Vasconcelos, C., McKenzie, J. A., Bernasconi, S., Grujic, D., & Tiens, A. J. (1995) · Nature · doi:10.1038/377220a0 · Cited by 745 · cited 1× · see citing works
“As sulphate is consumed, MgSO 4 becomes disassociated and Mg++ comes available for further dolomite formation (Vasconcelos et al., 1995; Vasconcelos and McKenzie, 1997).”
BackgroundDolomite formation within microbial mats in the coastal sabkha of Abu Dhabi (United Arab Emirates)
BONTOGNALI, T. R. R., VASCONCELOS, C., WARTHMANN, R. J., BERNASCONI, S. M., DUPRAZ, C., STROHMENGER, C. J., & McKENZIE, J. A. (2010) · Sedimentology · doi:10.1111/j.1365-3091.2009.01121.x · Cited by 360 · cited 1× · see citing works
“A recent detailed geochemical and petrographic study of three sites in the intertidal and supratidal zones of the coastal sabkha of Abu Dhabi was conducted by Bontognali et al. (2010).”
BackgroundMicrobial precipitation of dolomite in methanogenic groundwater
Roberts, J. A., Bennett, P. C., González, L. A., Macpherson, G. L., & Milliken, K. L. (2004) · Geology · doi:10.1130/g20246.2 · Cited by 269 · see citing works
Sánchez‐Román, M., Vasconcelos, C., Warthmann, R., Rivadeneyra, M., & McKenzie, J. A. (2009) · Perspectives in Carbonate Geology · doi:10.1002/9781444312065.ch11 · Cited by 94 · see citing works
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Liu, D., Xu, Y., Papineau, D., Yu, N., Fan, Q., Qiu, X., & Wang, H. (2019) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2018.12.036 · Cited by 141 · see citing works
The importance of microbial mats for dolomite formation in the Dohat Faishakh sabkha, Qatar
Brauchli, M., McKenzie, J. A., Strohmenger, C. J., Sadooni, F., Vasconcelos, C., & Bontognali, T. R. R. (2016) · Carbonates and Evaporites · doi:10.1007/s13146-015-0275-0 · Cited by 74 · see citing works
Self-citationHuang, Y.-R., Yao, Q.-Z., Li, H., Wang, F.-P., Zhou, G.-T., & Fu, S.-Q. (2019) · Chemical Geology · doi:10.1016/j.chemgeo.2019.06.006 · Cited by 39 · see citing works
An Early Holocene Primary Dolomite Layer of Abiotic Origin in Lake Sayram, Central Asia
Cheng, J., Meng, X., Zhang, E., Jiang, Q., Ni, Z., & Ji, J. (2021) · Geophysical Research Letters · doi:10.1029/2021gl096309 · Cited by 20 · see citing works
Systematic laboratory approach to produce Mg-rich carbonates at low-temperature
Al Disi, Z. A., Zouari, N., Attia, E., Al-Asali, M., Al Saad Al-Kuwari, H., Sadooni, F., Dittrich, M., & Bontognali, T. R. R. (2021) · RSC Advances · doi:10.1039/d1ra06206a · Cited by 15 · see citing works
Self-citation
- Authors
- Sadooni, F. N., Howari, F., & El‐Saiy, A.
- Affiliations
- Qatar University (QA)
- The University of Texas of the Permian Basin (US)
- Corresponding author
- Sadooni, F. N.
- Venue
- Journal of Petroleum Geology
- Publisher
- Wiley
- Published
- 2010-09-23
- Volume
- 33
- Issue
- 4
- Pages
- 289-298
- ISSN
- 0141-6421 (ISSN-L)
- 1747-5457
- OpenAlex
- W2006565332
- Cited by
- 34
- References
- 4
- Citations by year
- 2026: 3 · 2025: 4 · 2024: 3 · 2023: 3 · 2022: 1 · 2021: 5 · 2019: 4 · 2018: 1 · 2017: 3 · 2016: 1 · 2015: 2 · 2014: 1 · 2012: 2
- FWCI
- 1.53
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Petroleum Geology (publishedVersion)
- Qatar University QSpace (Qatar University) (submittedVersion)
- Funders
- United Arab Emirates University
- Topics
- Physical Sciences › Engineering › Mechanics of Materials › Hydrocarbon exploration and reservoir analysis
- Physical Sciences › Earth and Planetary Sciences › Earth-Surface Processes › Geological formations and processes
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Keywords
- sabkha, dolomitization, nucleation sites, pore space, connate water, anoxia, microbial mats, foraminiferal tests, clay minerals, evaporites, petroleum exploration
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