Page 70 - Carbonate Sedimentology and Sequence Stratigraphy

CHAPTER 4: CARBONATE FACIES MODELS 61

REGIONAL COMPARISON OF RELATIVE DISTRIBUTION OF
SEDIMENTARY FEATURES STRUCTURES, GRAINS AND MINERALS

foraminifera low diversity
dolomite (micro-xln)
Trucial Coast +
humid climate
arid climate
Qatar-type
tide zones color Persian Gulf arid climate Andros Island Persian Gulf W. Australia w/ evaporites Birdseye mudcracks storm lams algal structures intraclasts burrows x-bedded evaporites (when present) pellets pisolites ooids open marine fossils, corals

SUPRATIDAL oxidized tan - brown

INTERTIDAL

reduced gray

SUBTIDAL

Fig. 4.8.— Left part: Overview of facies successions from subtidal to supratidal in several modern carbonate provinces. Encircled
letters denote regional variations: A - Quatar, Persian Gulf (moderately arid); B - Andros, Bahamas (humid); C - Trucial Coast, Persian
Gulf (very arid); D - intertidal Persian Gulf; E - intertidal Shark Bay, Australia. Right part: distribution of sedimentary structures, sediment
grains and early-diagenetic minerals. Note that the subtidal/intertidal boundary is rather subtle, the only significant feature being the
disappearance of certain sessile open-marine biota. The intertidal/supratidal boundary is much more pronounced. Sediments classified
as subtidal (or shallow-marine) may often include intertidal deposits. After Shinn (1983), modified.