Platform margin and deep water carbonates

Cook, H.E.

doi:10.3133/ofr84829

Cited by 1 publication

(2 citation statements)

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“…The reason for the cycles of calciclastic sedimentation is not known, but they may be related to fluctuations in sea-level that would effect carbonate production rates on the platform (cf. Kendall & Schlager, 1981 ;Mullins, 1983;Droxler, Schlager & Whallon, 1985;Boardman et al, 1986). Alternatively, pulses of fan sedimentation could be related to pulses of tectonic activity which may have generated sediment gravity flows or sea-level fluctuations as inferred above (cf.…”

Section: Interpretation-fluctuations In Sea-level or Tectonic Activitymentioning

confidence: 93%

“…This mechanism for the generation of deep-water carbonates during sea-level low-stands is the opposite of that seen in Recent and Pliestocene peri-platform sediments. In the modern Bahamas, high-stands result in more extensive carbonate platform sedimentation and in higher frequencies of calciturbidite sedimentation (Mullins, 1983;Droxler et al, 1985;Austin et al, 1985;Boardman eral., 1985).…”

Section: Sea-level Fluctuation Hypothesismentioning

confidence: 99%

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Triassic carbonate submarine fans along the Arabian platform margin, Sumeini Group, Oman

Watts

1988

Sedimentology

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The Sumeini Group formed along the passive continental margin slope that bounded the northeastern edge of the Arabian carbonate platform. With the initial development of this passive continental margin in Oman during Early to Middle Triassic time (possibly Permian), small carbonate submarine fans of the C Member of the Maqam Formation developed along a distally steepened slope. The fan deposits occur as several discrete lenticular sequences of genetically related beds of coarsegrained redeposited carbonate (calciclastic) sediment within a thick interval of basinal lime mudstone and shale. Repeated pulses of calciclastic sediment were derived from ooid shoals on an adjacent carbonate platform and contain coarser intraclasts eroded from the surrounding slope deposits. Sediment gravity flows, primarily turbidites with lesser debris flows and grain flows, transported the coarse sediments to the relatively deep submarine fans. Channel erosion was a major source of intraformational calcirudite. Two small submarine fan systems were each recurrently supplied with calciclastic sediment derived from point sources, submarine canyons. The northern fan system retrogrades and dies out upsection. The southern fan system was apparently longer‐lived; calciclastic sediments in it are more prevalent and occur throughout the section. The proximal portions of this fan system are dominated by channelized beds of calcirudite which represent inner‐ to mid‐fan channel complexes. The distal portions include mostly lenticular, unchannelized beds of calcarenite, apparently mid‐ to outer‐fan lobes. Carbonate submarine fans appear to be rare in the geological record in comparison with more laterally continuous slope aprons of coarse redeposited sediment. The carbonate submarine fans of the C Member apparently formed by the funnelling of coarse calciclastic sediment into small submarine canyons which may have developed due to rift and/or transform tectonics. The alternation of discrete sequences of calciclastic sediment with thick intervals of ‘background’ sediment resulted from either sea‐level fluctuations or pulses of tectonic activity.

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Section: Interpretation-fluctuations In Sea-level or Tectonic Activitymentioning

confidence: 93%

Section: Sea-level Fluctuation Hypothesismentioning

confidence: 99%