Carbonate – Clastic Transitions by Larry J. Doyle

By Larry J. Doyle

Through the years, the sector of sedimentology has turn into subdivided into a variety of specialities. of the biggest teams are those that research clastic rocks and those that learn carbonates. there's little conversation among the 2: journals look that are solely dedicated to one or the opposite, and learn meetings are typically jointly specific. nevertheless, rocks themselves can't be "pigeon-holed" during this method - the facies swap from clastic to carbonate either laterally and during time. This quantity stems from the editors' observations of such alterations within the Gulf of Mexico and their awareness that those geologically very important transitions have been being principally neglected due to expert compartmentilization. The publication opens with a bankruptcy which supplies an outline of the complete photo of world styles of carbonate and clastic sedimentation. It then proceeds to a dialogue of sedimentary versions of siliciclastic deposits and coral reef relationships. the remainder of the publication contains 8 case experiences on carbonate-clastic transitions, and a last bankruptcy on keep an eye on of carbonate-clastic sedimentation structures through baroclinic coastal currents

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Dept. Fisheries and Oceans, Ottawa: 9-17. W. The breakup of Pangaea: Climatic, erosional and sedimentological effects. Proc. Internat. Geol. , Moscow, 1984. W. , 1976. Calcareous plankton and loss of CaO from the continents. Geol. SOC. Am. Abstracts with Programs, 7: 1105. W. and Southam. , 1977. Modulation of marine sedimentation by the continental shelves. R. Andersen and A. Malahoff (Editors), The Fate of Fossil Fuel CO in the oceans. Plenum Press, New York. pp. 569-604. J.. Sloan, J . L . R..

T) R e e f - t a l u s d e p o s i t s . (N) Margin o f t h e d e l t a i c c h a n n e l . (R) Reef c o r e . Deltaic channel Mixed clastic-’carbonate sediments Marsin of the deltaic channel Reef core B F i g . 9 B . ( A ) A x i s o f t h e c h a n n e i . ( C ) Mixed c l a s t i c c a r b o n a t e s e d i m e n t s . (M) M a r g i n o f t h e d e l t a i c c h a n n e l . ( R ) Reef c o r e . (D) D e l t a i c channel. (T) R e e f - t a l u s d e p o s i t s . 55 These dunes are grouped in "greater" sand bodies (25-50 m length and 4m height).

21 these differences being compensated isostatically to yield a figure of 1624 m for the dry pore space model and 1639 m for the wet pore space model. To construct the paleotopographic maps Hay (1984) assumed a constant rate of loss of sediment off the continental blocks. The thermal elevation increments predicted for each 5" square were added to the predicted average elevation of the continents for each time. If the average elevation of the continents was predicted to be more than 1 km, the coastal areas which were not active margins or young passive margins were assumed to be less than 1 km.

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