Abstract:The carbon isotopic (␦ 13 C) composition of bulk carbonate sediments deposited off the margins of four carbonate platforms/ramp systems (Bahamas, Maldives, Queensland Plateau, and Great Australian Bight) show synchronous changes over the past 0 to 10 million years. However, these variations are different from the established global pattern in the ␦ 13 C measured in the open oceans over the same time period. For example, from 10 Ma to the present, the ␦ 13 C of open oceanic carbonate has decreased, whereas plat… Show more
“…A trend towards δ 13 C depleted ratios and negative maxima in δ 13 C correspond to phases of sediment erosion and reworking during sea level lowstands and regressions (Hilbrecht et al 1986;Voigt & Hilbrecht 1997). Swart (2008) demonstrated a strong relationship between Late Cenozoic sea level changes and the δ 13 C trends in carbonate platform systems. Aragoniteproducing organisms proliferate at carbonate platforms especially during transgressions and high sea levels.…”
Section: Variations In the Evolution Of Larger Benthic Foraminifera Amentioning
confidence: 99%
“…Microfacies indicate the predominance of aragonitic coralline red algae and calcitic larger benthic foraminifera ( Figure 4). Following the approach of Swart (2008), aragonitic organisms, which flourish during times of relatively high sea level, favour the production of 13 C-enriched carbon isotopes. Global sea level and regional sequence stratigraphic reconstructions point to a flooding of the Prebetic platform prior to the Eocene-Oligocene boundary ( Figure 1; Geel 2000; Miller et al 2005).…”
Section: Variations In the Evolution Of Larger Benthic Foraminifera Amentioning
“…A trend towards δ 13 C depleted ratios and negative maxima in δ 13 C correspond to phases of sediment erosion and reworking during sea level lowstands and regressions (Hilbrecht et al 1986;Voigt & Hilbrecht 1997). Swart (2008) demonstrated a strong relationship between Late Cenozoic sea level changes and the δ 13 C trends in carbonate platform systems. Aragoniteproducing organisms proliferate at carbonate platforms especially during transgressions and high sea levels.…”
Section: Variations In the Evolution Of Larger Benthic Foraminifera Amentioning
confidence: 99%
“…Microfacies indicate the predominance of aragonitic coralline red algae and calcitic larger benthic foraminifera ( Figure 4). Following the approach of Swart (2008), aragonitic organisms, which flourish during times of relatively high sea level, favour the production of 13 C-enriched carbon isotopes. Global sea level and regional sequence stratigraphic reconstructions point to a flooding of the Prebetic platform prior to the Eocene-Oligocene boundary ( Figure 1; Geel 2000; Miller et al 2005).…”
Section: Variations In the Evolution Of Larger Benthic Foraminifera Amentioning
“…In addition, the age of the last platform sequence will provide the age of the platform drowning that potentially is linked to the onset of the current system. Site U1466 cores will also address another objective of Expedition 359: the periplatform sediments deposited at this site offer the opportunity to retrieve a complete record of δ 13 C though the lower and middle Miocene that, together with other Expedition 359 sites, will provide another data set of the carbon isotopic record that is needed to calibrate the periplatform platform margin record against the pelagic record (Swart, 2008).…”
“…In addition, the age of the last platform sequence will provide the timing of the platform drowning that potentially is linked to the onset of the current system. Site U1466 cores will also address another objective of Expedition 359: the periplatform sediments deposited at this site offer the opportunity to retrieve a complete record of δ 13 C though the lower and middle Miocene that, together with other Expedition 359 sites, will provide another data set of the carbon isotopic record that is needed to calibrate the periplatform platform margin record against the pelagic record (Swart, 2008).…”
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