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9.1 Carbonate rocks, origin, isotopic composition

The range of carbon isotopic composition (Fig. 4) in the shallow-water deposits is wide (from 0%o in the rock, to —44%o in reduced carbon, possibly as light as — 50%o on original deposition). How much of this records rubisco, and how much other processes such as methanogenesis ... [Pg.320]

Table 4. Bulk-rock carbon and oxygen isotope results for dolomite cement in the Angel Formation, Angel Field. Precipitation temperatures for dolomite cement were calculated using the fractionation factor of Northrop Clayton (1966) and assuming a marine composition for the original 8 0 pore water (6 0 = 0%o). When integrating the calculated dolomite precipitation temperatures (93-97 °C) with the geohistory plot for Angel-2 (Fig. 4) an Eocene to Late Miocene age for the dolomite cement is suggested, closely matching the seismic evidence (Fig. 22c)... Table 4. Bulk-rock carbon and oxygen isotope results for dolomite cement in the Angel Formation, Angel Field. Precipitation temperatures for dolomite cement were calculated using the fractionation factor of Northrop Clayton (1966) and assuming a marine composition for the original 8 0 pore water (6 0 = 0%o). When integrating the calculated dolomite precipitation temperatures (93-97 °C) with the geohistory plot for Angel-2 (Fig. 4) an Eocene to Late Miocene age for the dolomite cement is suggested, closely matching the seismic evidence (Fig. 22c)...
Most of the samples collected over this interval and from certain other regions represent only non-transformed micrite carbonates. XRD analyses and microscopic observations only reveal very poorly crystallized limestones, the carbon isotope composition of which corresponds to that of carbonate rocks of marine origin. Even here,... [Pg.265]

Faure G, Barrett PJ (1973) Strontium isotope compositions of non-marine carbonate rocks from the Beacon Supergroup of the Transantarctic Mountains. J Sed Pet 43(2) 447 57 Faure G, Botoman G (1984) Origin of epigenetic calcite in coal from Antarctica and Ohio. Isotope Geoscience 2 313-324 (Chem Geol 46(4) 313-324)... [Pg.366]

See other pages where 9.1 Carbonate rocks, origin, isotopic composition is mentioned: [Pg.370]    [Pg.174]    [Pg.331]    [Pg.347]    [Pg.228]    [Pg.178]    [Pg.41]    [Pg.64]    [Pg.66]    [Pg.412]    [Pg.157]    [Pg.244]    [Pg.2083]    [Pg.3714]    [Pg.3963]    [Pg.5033]    [Pg.187]    [Pg.174]    [Pg.223]    [Pg.60]    [Pg.406]    [Pg.83]    [Pg.245]    [Pg.158]    [Pg.291]    [Pg.263]    [Pg.367]    [Pg.784]    [Pg.17]    [Pg.495]    [Pg.34]    [Pg.444]    [Pg.283]    [Pg.251]    [Pg.3969]    [Pg.245]    [Pg.7]    [Pg.258]    [Pg.601]    [Pg.306]    [Pg.229]    [Pg.732]    [Pg.738]    [Pg.245]   
See also in sourсe #XX -- [ Pg.331 , Pg.332 , Pg.333 , Pg.334 , Pg.335 , Pg.336 , Pg.337 , Pg.338 ]



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Carbon composites

Carbon composition

Carbon isotopic composition

Carbon, isotope composition

Carbonate rocks

Isotopes carbon

Isotopic carbon

Isotopic composition

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