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- W2020386483 abstract "Euhedral micro-rhombic calcite forms a microporosity network in limestones of the Lower Cretaceous Thamama Group, U.A.E. Isotopic and trace-element data indicate that micro-rhomb formation was a two-step process associated with diagenesis in meteoric waters. The micro-rhombic calcite, and the micropores are both products of the second event. Sr, Fe, Mn, and Mg contents of the micro-rhombs are all relatively low, ranging from 108 to 310 ppm, 34 to 308 ppm, 3 to 32 ppm, and 0.42 to 0.68 mole %, respectively. The low Sr and Mg contents indicate extensive flushing of these constituents from the rock. The low Fe and Mn contents are probably inherited from the original sediments and indicate the lack of any Fe or Mn in the pore fluids during micro-rhomb formation. The ϵ13C of the micro-rhombs (+ 3.1 to + 4.5% PDM) are also primary, unaltered by diagenesis. The ϵ13O of the micro-rhombs (−4.5 to −6.0% PDB) reflect alteration by mateoric waters. A large number of pore volumes and an open, water-buffered system would be necessary to flush Sr and Mg, yet decreasing ϵ18O with increasing porosity indicates that ϵ18O values in non-porous intervals are partially rock-buffered. Two diagenetic events are thus implicated, the first flushing Sr and Mg and lowering ϵ18O in all rocks, and the second event actually forming the micro-rhombs and further altering ϵ18O as a function of porosity. The first diagenetic event was most likely mineralogical stabilization in an unconfined meteoric aquifer immediately after Shuaiba deposition. If mineralogical stabilization was completed in the first event, then calcite-to-calcite recrystallization is implicated for the second event. The second event may have occurred in the unconfined meteoric aquifer, or it may have occurred in a confined meteoric aquifer during the early Late Cretaceous." @default.
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- W2020386483 title "Micro-rhombic calcite and microporosity in limestones: a geochemical study of the lower cretaceous thamama group, U.A.E." @default.
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- W2020386483 doi "https://doi.org/10.1016/0037-0738(89)90137-1" @default.
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