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- W2765487653 abstract "Evaporite dating has been an open problem. The study investigates the Re-Os isotopic system in the organic-rich sedimentary rocks to constrain the infilling of sedimentary basin and related geological events. In the Mboukoumassi potash deposit in the Republic of Congo (Congo-Brazzaville) in West Africa, several layers of organic-rich dark shale were found in the evaporite series. Through drilling core, the dark shale in the evaporite is found to satisfy the requirements of Re-Os isotope test. The result shows that the Re-Os isochron age of the dark shale in the study area ranges from 78.7 ± 1.1 to 96 ± 7 Ma, which is the first precise age of the Mboukoumassi potash deposit in the Republic of Congo (Congo-Brazzaville), West Africa. Therefore, the age of deposition of this set of evaporite may be Cenomanian-Turonian, which is younger than the age previously thought (around 113-125Ma, Aptian). The Re-Os isotopic dating technique used for the pioneering study on the precise dating of the Mboukoumassi potash deposit provides a new approach to the study of the sedimentary age of ancient evaporite deposits. The initial 187Os/188Os value decreasing from 2.02 ± 0.21 to 0.982 ± 0.03 for the core sample reflects the source rock chang along the core, and this is consistent with the geological evolution of the basin." @default.
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- W2765487653 date "2018-02-01" @default.
- W2765487653 modified "2023-09-22" @default.
- W2765487653 title "Characteristics and geological significance of Re-Os isotopic system of evaporites in Mboukoumassi deposit, the Republic of Congo" @default.
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- W2765487653 doi "https://doi.org/10.1016/j.jafrearsci.2017.10.020" @default.
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