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- W2024654077 abstract "Cores of unlithified Holocene sediment from shallow ephemeral lakes in the Coorong region S.A., contain dolomite at various stratigraphic intervals. Two distinct dolomite types are recognized using stable carbon and oxygen isotope data, unit cell calculations, transmission electron microscopy (TEM), and bulk composition data. Detailed X-ray diffraction (XRD) analyses show that the dolomite is ordered, but that ordering is variable. Average unit cell parameters indicate that the crystal lattice of one type of dolomite (type A) is expanded in the co direction (co = 16.08 Å) and contracted in the ao direction (ao = 4.799 Å) relative to ideal dolomite (c0 = 16.02 Å and ao = 4.812 Å, respectively). Type A dolomite occurs in the centers of the larger basins. The mole fraction of MgCO3 is as much as 53 ± 1%. The unusual crystal chemistry and (TEM) data indicating a heterogeneous microstructure suggest that this dolomite is generated by rapid precipitation from brines which have highly elevated MgCa ratios. Dolomite ordering reflections are present in electron diffraction patterns but are weak. Stable oxygen and carbon isotope values are tightly grouped (ave. δ18O = +7.6‰, s.d. = 0.6‰; δ13C = +3.5‰, s.d. = 0.7‰). The other type of dolomite (type B) is Ca-rich, has lower stable isotope values (ave. δ18O ≈ +6.4‰, δ13C ≈ −1.2‰) than type A dolomite, has a more homogeneous microstructure, is expanded in both the ao and co axes, and is generally better ordered than type A dolomite. These data suggest type B dolomite is precipitated more slowly from less evaporitic brines than type A dolomite." @default.
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- W2024654077 date "1989-03-01" @default.
- W2024654077 modified "2023-10-10" @default.
- W2024654077 title "Formation of dolomite in the Coorong region, South Australia" @default.
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- W2024654077 doi "https://doi.org/10.1016/0016-7037(89)90009-4" @default.
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