Bulk carbonate isotope stratigraphy from CRP-3 core (Victoria Land Basin, Antarctica): evidence for Eocene–Oligocene palaeoclimatic evolution

Bellanca, Adriana; Aghib, F. S.; Neri, Rodolfo; Sabatino, Nadia

doi:10.1016/j.gloplacha.2004.06.014

Cited by 5 publications

(2 citation statements)

References 19 publications

(20 reference statements)

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“…As to the 18 O depleted compositions of AND-1B bulk carbonate, the measured values are in the range found by Aghib et al (2003) and Bellanca et al (2005) for carbonates of Antarctic sediments from the CRP-3 core (Fig. 1).…”

Section: Bulk Carbonate 18 O and 13 C Depletionsupporting

confidence: 82%

Petrography and carbonate isotope stratigraphy from MIS AND-1B core, Antarctica: Evidence of the early Pliocene warming event

Scopelliti

Bellanca

Neri

2011

Global and Planetary Change

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Section: Bulk Carbonate 18 O and 13 C Depletionsupporting

confidence: 82%

Petrography and carbonate isotope stratigraphy from MIS AND-1B core, Antarctica: Evidence of the early Pliocene warming event

Scopelliti

Bellanca

Neri

2011

Global and Planetary Change

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“…Similar arguments have now been applied to sub-Antarctic sedimentary basins. There is abundant evidence from offshore drill records around Antarctica to suggest that methane is widespread in sub-sea floor sediments (Lonsdale 1990; Kelly et al 1995; Barker 1999; Bohrmann et al 1999; Bellanca et al 2005; Claypool 2003). While rates of production may be low within these ancient sediments, several factors could amplify the potential accumulation of methane in sedimentary basins beneath an ice sheet.…”

Section: Export Mechanisms For Biogenic Gases and Nutrients And Widermentioning

confidence: 99%

The potential role of the Antarctic Ice Sheet in global biogeochemical cycles

Wadham

Death

Monteiro

et al. 2013

Earth and Environmental Science Transactions of the Royal Socie

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Once thought to be devoid of life, the Antarctic Ice Sheet is now known to be a dynamic reservoir of organic carbon and metabolically active microbial cells. At the ice-bed interface, subglacial lake and sedimentary environments support low diversity microbial populations, adapted to perennial cold, anoxia and lack of light. The dynamic exchange of water between these shallow environments conveys meltwaters and associated sediments into the coastal ocean. This, together with the release of iceberg-rafted debris to more distal coastal environments, could be important for sustaining primary productivity in the iron-limited Southern Ocean, via the release of associated nutrients and bioavailable iron. We estimate the magnitude and review the wider impacts of the potential export of nutrients (N, P, C, Si and bioavailable Fe) dissolved and associated with suspended sediments in Antarctic runoff and entombed in iceberg rafted debris. Located beneath subglacial lakes and the subglacial till complex are deep sedimentary basins up to 14 km thick, located largely around the Antarctic periphery. These sedimentary basins are largely hydrologically decoupled from shallower lake and till environments by the presence of highly consolidated sediments which limit the penetration of glacial meltwaters to depth. They provide extensive habitats for sustained microbial activity over Ma timescales, and are likely to be a focal point for the anaerobic cycling of organic carbon and other elements in the deep sub-surface. Organic carbon buried in these basins during ice sheet formation is thought to be microbially cycled to methane gas, and the methane largely stored as hydrate within sediments, stabilised by the high pressure/low temperature conditions. We conclude that the export of nutrients and biogenic gases from deep and shallow subglacial Antarctic environments designates Antarctica as a potentially important component of the Earth's carbon cycle, and highlight the importance of evaluating these potential impacts further via global and regional-scale biogeochemical modelling.

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Petrography and stable isotope geochemistry of cretaceous sandstones, Orange Basin, South Africa

Adekola

Akinlua

2013

J Petrol Explor Prod Technol

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Some siliciclastic rock samples of the Orange Basin were subjected to diagenetic and reservoir quality evaluation; 33 core and side wall core samples from 8 wells within the genetically related packages (systems tracts); lowstand systems tract, transgressive systems tract and highstand systems tract were collected for this study, to determine the prevailing conditions at deposition and post deposition of the sediments within the age bracket of Barremian to Campanian. The samples were subjected to petrographic and mineralogical analyses including bulk stable isotope analysis of oxygen and carbon. From the petrography of the samples, the basin shows complex diagenetic histories which include compaction, cementation/micritization, dissolution, overgrowth of quartz, and fracturing. The Eh-pH shows that the cements in the area of the basin under investigation were precipitated under weak acidic and slightly alkaline conditions. The d 18 O isotope values of the samples range from-1.648 to 16.180 % whilst d 13 C isotope values range from-25.86 to-6.95 %, which is indicative of terrestrial biomass contribution. The plot of d 18 O versus d 13 C shows that the sediments were deposited in shallow marine temperate conditions with some Barremian and Aptian samples more marine. There is no significant variation of d 13 C isotope values across the stratigraphic sequences, which could be an indication that the burial diagenesis does not have significant effect on geochemical pattern of the d 13 C isotope in the sandstones but contribution from land-derived materials. The authigenic minerals precipitated blocked the grain interspaces and interlayers and with continued burial, compaction impeded the development of secondary porosity resulting in the poor reservoir quality. The origins of the cementing materials were both autochthonous and allochthonous.

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Bulk carbonate isotope stratigraphy from CRP-3 core (Victoria Land Basin, Antarctica): evidence for Eocene–Oligocene palaeoclimatic evolution

Cited by 5 publications

References 19 publications

Petrography and carbonate isotope stratigraphy from MIS AND-1B core, Antarctica: Evidence of the early Pliocene warming event

Petrography and carbonate isotope stratigraphy from MIS AND-1B core, Antarctica: Evidence of the early Pliocene warming event

The potential role of the Antarctic Ice Sheet in global biogeochemical cycles

Petrography and stable isotope geochemistry of cretaceous sandstones, Orange Basin, South Africa

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