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1963) gives a Late Mesozoic age, which also suggests a minor role for authigenic clay components during the syndiagenetic phase; this does not preclude further K+ being taken up during anadiagenesis.

In the deep oil wells on the Texas Gulf coast at depths down to 25,000 ft. (8,000 m), the temperature through normal heat flow should be high, but may exceed 150°C mainly through this same exothermic mineral oxidation. - - Pressure In a gradually accumulating sedimentary basin there is a progressive increase of load pressure (LANE,1922). This has sometimes been called load metamorphism or static metamorphism, as opposed to dynamic metamorphism, which involves tangential stresses as well as simple vertical compressive stress.

Both being always present in the ocean, they are likely to be organically reprecipitated as CaCOs, “magnesian calcite”, or recrystallized later as dolomite. Decarbonatization normally occurs in the presence of solutions of COz and then of HCOs-. Carbonic acid HzC03 is stabIe only at low pH and thus it is an impossible combination to occur in the ocean. The bicarbonate ion can exist in the initial (near-surface) conditions of open oceanic diagenesis,and again in the epidiagenetic phase when it is reintroduced by meteoric waters.