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- W21620008 abstract "The term reflux dolomitization generally connotes a silled lagoon undergoing evaporite precipitation, beneath which dense brines move down section, dolomitizing subtidal facies. Ramps lacking evaporite lagoons in semiarid settings subjected to low-amplitude sea level oscillations, however, show much early dolomite formed by gravity-driven brines. Cycle progradation starts after transgression, and accompanies shoaling of the inner ramp. As tidal flats prograde, laminites on flats become dolomitized as a result of storm-flooding by marine waters that infiltrate the flats, become evaporatively concentrated, and undergo capillary rise. These waters have elevated Mg/Ca largely due to CaCO/sub 3/ and minor CaSO/sub 4/ precipitation. As flats prograde (reaching widths of up to 300 km in 100,000 years), the supratidal surface (brine factor) enlarges, at the same time undergoing gradual subsidence, allowing it to track sea level fall and decrease in slope (to a few centimeters/1000 years). Thus, vast areas are formed for evaporation of storm-recharge waters that infiltrate previously dolomitized laminites on interiors of flats. Older dolomites in interiors of flats become more coarsely crystalline and obscure primary fabric. The tidal flats prograde out from cratonic shorelines and arches, and migrate out into depocenters on the ramp or toward the regional ramp margin; intensity ofmore » dolomitization decreases in the direction of progradation. Thus, in depocenters and along the outer ramp, sections have abundant subtidal limestone preserved. These types of dolomite should have delta/sup 18/O values enriched 2-4 per thousand relative to carbonate precipitated from marine waters. However, because of the relative instability of these disordered Ca-rich dolomites, their isotopic and trace-element chemistries may be modified later by isotopically light diagenetic fluids. These dolomites are the dominant type in the Knox Group.« less" @default.
- W21620008 created "2016-06-24" @default.
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- W21620008 date "1986-05-01" @default.
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- W21620008 title "Tidal-flat and shallow subsurface evaporative dolomitization" @default.
- W21620008 hasPublicationYear "1986" @default.
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