Geochemistry and Sr, S, and O stable isotopes of Miocene Abu Dhabi evaporites, United Arab Emirates
This study investigates for the first time the subsurface Miocene evaporite facies (Gachsaran Formation) in Abu Dhabi, United Arab Emirates. Forty-five evaporite rock samples were selected for petrographic, mineralogical, and geochemical investigations and stable isotope analyses to decipher their o...
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Elsevier
2023-05-01
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| Series: | Heliyon |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405844023032401 |
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| author | Ahmed Gad Osman Abdelghany Hasan Arman Bahaa Mahmoud Ala Aldahan Safwan Paramban Mahmoud Abu Saima |
| author_facet | Ahmed Gad Osman Abdelghany Hasan Arman Bahaa Mahmoud Ala Aldahan Safwan Paramban Mahmoud Abu Saima |
| author_sort | Ahmed Gad |
| collection | DOAJ |
| description | This study investigates for the first time the subsurface Miocene evaporite facies (Gachsaran Formation) in Abu Dhabi, United Arab Emirates. Forty-five evaporite rock samples were selected for petrographic, mineralogical, and geochemical investigations and stable isotope analyses to decipher their origin and constrain their age. Secondary gypsum with anhydrite relics dominates the investigated evaporitic rocks, with minor amounts of clays, dolomicrite, Fe/Ti oxides, and celestite. These samples are characterized by their excellent purity and low variability in geochemical composition. The distribution of trace element concentrations is significantly influenced by continental detrital intake. The main focus of the study is to determine the strontium, sulfur, and oxygen stable isotope compositions. The measured 87Sr/86Sr values of 0.708411–0.708739 are consistent with Miocene marine sulfates and indicate ∼21.12–15.91 Ma (Late Aquitanian-Burdigalian). The δ34S and δ18O values are 17.10‰–21.59‰ and 11.89‰–19.16‰, respectively. These values are comparable to those of Tertiary marine evaporites. The relatively low values of δ34S suggest that non-marine water possesses little influence on S distribution. The geochemical composition and Sr, S, and O isotope distributions of the Abu Dhabi gypsum facies from the Gachsaran Formation reveals that their source brines were marine (coastal saline/sabkha) with subordinate continental input. |
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| id | doaj.art-e7f8469c461f493db651b3aa1ee61c8a |
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| issn | 2405-8440 |
| language | English |
| last_indexed | 2024-03-13T08:25:19Z |
| publishDate | 2023-05-01 |
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| series | Heliyon |
| spelling | doaj.art-e7f8469c461f493db651b3aa1ee61c8a2023-05-31T04:46:23ZengElsevierHeliyon2405-84402023-05-0195e16033Geochemistry and Sr, S, and O stable isotopes of Miocene Abu Dhabi evaporites, United Arab EmiratesAhmed Gad0Osman Abdelghany1Hasan Arman2Bahaa Mahmoud3Ala Aldahan4Safwan Paramban5Mahmoud Abu Saima6United Arab Emirates University, College of Science, Geosciences Department, P. O. Box: 15551, Al Ain, United Arab Emirates; Ain Shams University, Faculty of Science, Geology Department, 11566, Cairo, EgyptUnited Arab Emirates University, College of Science, Geosciences Department, P. O. Box: 15551, Al Ain, United Arab Emirates; Ain Shams University, Faculty of Science, Geology Department, 11566, Cairo, EgyptUnited Arab Emirates University, College of Science, Geosciences Department, P. O. Box: 15551, Al Ain, United Arab Emirates; Corresponding author.United Arab Emirates University, College of Science, Geosciences Department, P. O. Box: 15551, Al Ain, United Arab EmiratesUnited Arab Emirates University, College of Science, Geosciences Department, P. O. Box: 15551, Al Ain, United Arab EmiratesUnited Arab Emirates University, College of Science, Geosciences Department, P. O. Box: 15551, Al Ain, United Arab EmiratesUnited Arab Emirates University, College of Science, Geosciences Department, P. O. Box: 15551, Al Ain, United Arab Emirates; Ain Shams University, Faculty of Science, Geology Department, 11566, Cairo, EgyptThis study investigates for the first time the subsurface Miocene evaporite facies (Gachsaran Formation) in Abu Dhabi, United Arab Emirates. Forty-five evaporite rock samples were selected for petrographic, mineralogical, and geochemical investigations and stable isotope analyses to decipher their origin and constrain their age. Secondary gypsum with anhydrite relics dominates the investigated evaporitic rocks, with minor amounts of clays, dolomicrite, Fe/Ti oxides, and celestite. These samples are characterized by their excellent purity and low variability in geochemical composition. The distribution of trace element concentrations is significantly influenced by continental detrital intake. The main focus of the study is to determine the strontium, sulfur, and oxygen stable isotope compositions. The measured 87Sr/86Sr values of 0.708411–0.708739 are consistent with Miocene marine sulfates and indicate ∼21.12–15.91 Ma (Late Aquitanian-Burdigalian). The δ34S and δ18O values are 17.10‰–21.59‰ and 11.89‰–19.16‰, respectively. These values are comparable to those of Tertiary marine evaporites. The relatively low values of δ34S suggest that non-marine water possesses little influence on S distribution. The geochemical composition and Sr, S, and O isotope distributions of the Abu Dhabi gypsum facies from the Gachsaran Formation reveals that their source brines were marine (coastal saline/sabkha) with subordinate continental input.http://www.sciencedirect.com/science/article/pii/S2405844023032401EvaporitesGypsumGeochemistry87Sr/86SrIsotopesMiocene |
| spellingShingle | Ahmed Gad Osman Abdelghany Hasan Arman Bahaa Mahmoud Ala Aldahan Safwan Paramban Mahmoud Abu Saima Geochemistry and Sr, S, and O stable isotopes of Miocene Abu Dhabi evaporites, United Arab Emirates Heliyon Evaporites Gypsum Geochemistry 87Sr/86Sr Isotopes Miocene |
| title | Geochemistry and Sr, S, and O stable isotopes of Miocene Abu Dhabi evaporites, United Arab Emirates |
| title_full | Geochemistry and Sr, S, and O stable isotopes of Miocene Abu Dhabi evaporites, United Arab Emirates |
| title_fullStr | Geochemistry and Sr, S, and O stable isotopes of Miocene Abu Dhabi evaporites, United Arab Emirates |
| title_full_unstemmed | Geochemistry and Sr, S, and O stable isotopes of Miocene Abu Dhabi evaporites, United Arab Emirates |
| title_short | Geochemistry and Sr, S, and O stable isotopes of Miocene Abu Dhabi evaporites, United Arab Emirates |
| title_sort | geochemistry and sr s and o stable isotopes of miocene abu dhabi evaporites united arab emirates |
| topic | Evaporites Gypsum Geochemistry 87Sr/86Sr Isotopes Miocene |
| url | http://www.sciencedirect.com/science/article/pii/S2405844023032401 |
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