Sedimentological Evolution of North Sound, Grand Cayman: A Freshwater to Marine Carbonate Succession Driven by Holocene Sea-Level Rise

MacKinnon, L; Jones, Brian

doi:10.1306/121800710568

Cited by 16 publications

(5 citation statements)

References 23 publications

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“…These seagrass meadows line the shoreward edge of each lagoon (Fig. 1, Table 2), with the exception of North Sound, where it is mainly found in the lagoon interior (Roberts, 1994;MacKinnon and Jones, 2001). The meadows can extend out as far as the rubble or reef shoal zone MacKinnon and Jones, 2001;, which is located just behind the reef crest (Fig.…”

Section: T Testudinum Distribution On Grand Caymanmentioning

confidence: 96%

Epiphyte communities on Thalassia testudinum from Grand Cayman, British West Indies: Their composition, structure, and contribution to lagoonal sediments

Corlett

Jones

2007

Sedimentary Geology

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Section: T Testudinum Distribution On Grand Caymanmentioning

confidence: 96%

Epiphyte communities on Thalassia testudinum from Grand Cayman, British West Indies: Their composition, structure, and contribution to lagoonal sediments

Corlett

Jones

2007

Sedimentary Geology

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“…During interglacials, the optimum water depth for carbonate production on bank tops and atoll lagoons is intimately linked to the type of carbonate producers. Assuming that sediment production presently occurs on the shallow banks and atolls, the observed thin sediment covers and its coarse nature attest to the fact that sediments presently are not accumulating in significant quantities on platform tops to fill up the available accommodation space (Hine et al, 1988;Triffleman, 1989;Milliman et al, 1993;MacKinnon and Jones, 2001;Gischler, 2003) and the majority of the sediments are exported toward the deeper periplatform environments.…”

Section: Introductionmentioning

confidence: 99%

Deepwater carbonate deposition in response to re-flooding of carbonate bank and atoll-tops at glacial terminations

Jorry

Droxler

Francis

2010

Quaternary Science Reviews

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The late Quaternary has experienced large glacial/interglacial climatic variations and related 10's to 100 meters high-amplitude sea level fluctuations at Milankovich frequencies from 10's to 100 kyr during which carbonate platform tops have been exposed and re-flooded in many occasions. This study focuses on the accumulation of calci-turbidites, the aragonite onset/sharp increase in fine sediments and their timing in deep basins adjacent to carbonate platforms. A particular emphasis is developed on the occurrence of the first gravity flow event and aragonite onset/sharp increase and their linkage to the initial re-flooding of the platform tops during deglaciations. Three basins adjacent to isolated platforms in the Bahamas, the Northern Nicaragua Rise, and the Gulf of Papua, were selected to represent pure carbonate versus mixed systems, in quiescent versus tectonically active settings, and various carbonate bank top morphologies, ranging from atoll to relatively deeply and narrowly flooded flat top banks. In spite of these differences, each record illustrates a clear relationship between the timing of platform top re-flooding and initiation of significant carbonate export by gravity flows and low-density plumes into the surrounding basins. The concept of "re-flooding window" is introduced to characterize the prolific period of time during which bank and atoll-tops are flooded enough to produce large export of bank-derived aragonite and of calci-turbidites in adjacent basins. According to our datasets, the main re-flooding windows have occurred mainly on the last part of the sea level rise at each glacial termination (T), those periods being marked by some of the highest rates of sea level rise. The analysis of a long-piston core from the earthquakes-prone Walton Basin (Northern Nicaragua Rise) demonstrates that sea level, not seismic activities, played a major role as trigger mechanism for the initiation of gravity flows since the last four glacial/interglacial transitions, and supports the existence of an extra glacial termination during the early portion of the transition from MIS 7.4 to MIS 7.3 (TIIIA).

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“…These atolls are typical rimmed reefs, reaching present sea level and enclosing shallow lagoons with water depths of 40–55 m [ Francis et al , 2008; J. M. Webster, personal communication, 2006]. Because Holocene lagoonal sediment should have minimal thickness [ MacKinnon and Jones , 2001; Gischler , 2003], the average present lagoon depths most likely approximate the topography of a Pleistocene karstified surface prior to the most recent flooding. These reef systems border Ashmore and Pandora Troughs and supply neritic carbonate sediment to these basins, especially during the Holocene.…”

Section: Introductionmentioning

confidence: 99%

Bundled turbidite deposition in the central Pandora Trough (Gulf of Papua) since Last Glacial Maximum: Linking sediment nature and accumulation to sea level fluctuations at millennial timescale

Jorry¹,

Droxler²,

Mallarino³

et al. 2008

J. Geophys. Res.

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[1] Since Last Glacial Maximum (23-19 ka), Earth climate warming and deglaciation occurred in two major steps (Bølling-Allerød and Preboreal), interrupted by a short cooling interval referred to as the Younger Dryas (12.5-11.5 ka B.P.). In this study, three cores collected in the central part of Pandora Trough (Gulf of Papua) have been analyzed, and they reveal a detailed sedimentary pattern at millennial timescale. Siliciclastic turbidites disappeared during the Bølling-Allerød and Preboreal intervals to systematically reoccur during the Younger Dryas interval. Subsequent to the final disappearance of the siliciclastic turbidites a calciturbidite occurred during meltwater pulse 1B. The Holocene interval was characterized by a lack of siliciclastic turbidites, relatively high carbonate content, and fine bank-derived aragonitic sediment. The observed millennial timescale sedimentary variability can be explained by sea level fluctuations. During the Last Glacial Maximum, siliciclastic turbidites were numerous when the lowstand coastal system was located along the modern shelf edge. Although they did not occur during the intervals of maximum flooding of the shelf (during meltwater pulses 1A and 1B), siliciclastic turbidites reappear briefly during the Younger Dryas, an interval when sea level rise slowed, stopped, or perhaps even fell. The timing of the calciturbidite coincides with the first reflooding of Eastern Fields Reef, an atoll that remained exposed for most of the glacial stages.

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Sedimentological Evolution of North Sound, Grand Cayman: A Freshwater to Marine Carbonate Succession Driven by Holocene Sea-Level Rise

Cited by 16 publications

References 23 publications

Epiphyte communities on Thalassia testudinum from Grand Cayman, British West Indies: Their composition, structure, and contribution to lagoonal sediments

Epiphyte communities on Thalassia testudinum from Grand Cayman, British West Indies: Their composition, structure, and contribution to lagoonal sediments

Deepwater carbonate deposition in response to re-flooding of carbonate bank and atoll-tops at glacial terminations

Bundled turbidite deposition in the central Pandora Trough (Gulf of Papua) since Last Glacial Maximum: Linking sediment nature and accumulation to sea level fluctuations at millennial timescale

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