Reconstruction of primary productivity from the barium contents in surface sediments of the South Atlantic Ocean

Pfeifer, Kerstin; Kasten, Sabine; Hensen, Christian; Schulz, Horst D

doi:10.1016/s0025-3227(01)00121-9

Cited by 63 publications

(33 citation statements)

References 26 publications

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“…Although the Ba proxy has been widely applied, and algorithms have been developed to reconstruct paleoproductivity from this inorganic geochemical tracer (e.g. Dymond et al, 1992;Gingele and Dahmke, 1994;Van Os et al, 1994;Francois et al, 1995;Schneider et al, 1997;Nürnberg et al, 1997;Pfeifer et al, 2001;Moreno et al, 2002;Hillenbrand et al, 2003;Weldeab et al, 2003a;2003b;Meier et al, 2004;Reitz et al, 2004), fundamental questions remain concerning the exact mechanism/s of barite formation in the water column and its quantitative relationship to primary production and preservation.…”

Section: Barium As a Paleoproductivity Proxy/tracermentioning

confidence: 99%

Selective preservation of organic matter in marine environments; processes and impact on the sedimentary record

et al. 2010

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Abstract. The present paper is the result of a workshop sponsored by the DFG Research Center/Cluster of Excellence MARUM "The Ocean in the Earth System", the International Graduate College EUROPROX, and the Alfred Wegener Institute for Polar and Marine Research. The workshop brought together specialists on organic matter degradation and on proxy-based environmental reconstruction. The paper deals with the main theme of the workshop, understanding the impact of selective degradation/preservation of organic matter (OM) in marine sediments on the interpretation of the fossil record. Special attention is paid to (A) the influence of the molecular composition of OM in relation to the biological and physical depositional environment, including new methods for determining complex organic biomolecules, (B) the impact of selective OM preservation on the interpretation of proxies for marine palaeoceanographic and palaeoclimatic reconstruction, and (C) past marine productivity and selective preservation in sediments.It appears that most of the factors influencing OM preservation have been identified, but many of the mechanisms by which they operate are partly, or even fragmentarily, underCorrespondence to: G. J. M. Versteegh (versteegh@uni-bremen.de) stood. Some factors have not even been taken carefully into consideration. This incomplete understanding of OM breakdown hampers proper assessment of the present and past carbon cycle as well as the interpretation of OM based proxies and proxies affected by OM breakdown.To arrive at better proxy-based reconstructions "deformation functions" are needed, taking into account the transport and diagenesis-related molecular and atomic modifications following proxy formation.Some emerging proxies for OM degradation may shed light on such deformation functions. The use of palynomorph concentrations and selective changes in assemblage composition as models for production and preservation of OM may correct for bias due to selective degradation. Such quantitative assessment of OM degradation may lead to more accurate reconstruction of past productivity and bottom water oxygenation.Given the cost and effort associated with programs to recover sediment cores for paleoclimatological studies, as well as with generating proxy records, it would seem wise to develop a detailed sedimentological and diagenetic context for interpretation of these records. With respect to the latter, parallel acquisition of data that inform on the fidelity of the proxy signatures and reveal potential diagenetic biases would be of clear value.

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Section: Barium As a Paleoproductivity Proxy/tracermentioning

confidence: 99%

Selective preservation of organic matter in marine environments; processes and impact on the sedimentary record

et al. 2010

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“…Fluxes of barium and organic matter, based on sediment trap data of different oceanic regions have been used to develop algorithms, which link the barium flux to export production (Dymond et al, 1992;Francois et al, 1995;Nürnberg et al, 1997). Solid phase barium -or more precisely biogenic barite -may therefore be used to trace changes in recent and past primary production (e.g., Gingele and Dahmke, 1994;Francois et al, 1995;Ganeshram et al, 1995;Paytan et al, 1996;Ganeshram and Pedersen, 1998;Kasten et al, 2001;Pfeifer et al, 2001). However there are limiting factors which impact on the application of Ba as a productivity tracer.…”

Section: Bariummentioning

confidence: 99%

Geochemical distribution patterns as indicators for productivity and terrigenous input off NW Africa

Plewa

Meggers

Kuhlmann

et al. 2012

Deep Sea Research Part I: Oceanographic Research Papers

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a b s t r a c tOne hundred and twenty-eight surface-sediment samples collected off North-West Africa were studied geochemically to detect the expressions of different meridional climate regimes and zonal productivity gradients in the surface sediments. This geochemical multi-tracer approach, coupled with additional information on the bulk carbonate and TOC contents makes it possible to characterise the sedimentological regime in detail. Typical terrigenous elements like Al, K and Fe mirror the importance of the humid (fluvial) influence in the north of the study area and the dominance of aeolian input in the south. Furthermore, the distributions of Ti and Fe in the surface sediments serve as tracers for the supply of eolian volcanic material from the Canary Islands. The spatial variability of the TOC contents in the surface sediments closely follows the ocean surface productivity patterns, whereas the CaCO 3 contents are mainly controlled by dilution with terrigenous matter. The potential productivity proxy Ba is not a reliable tracer for productivity in this region, since it is mainly supplied by terrigenous input (coupled with aluminosilicates).

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“…Alternatively or additionally, the early-diagenetic elemental redistribution, which is exemplified by formation of surface oxidized Mn-rich zone (e.g., Pederesen et al, 1986), was restricted within the distance corresponding to the thickness of proto-chert and proto-shale couplet, though less likely compared with the former interpretation. Ba-Si relationship and implications for origin of bedded chert Excess-Ba contents, qualitatively expressed by Ba/ TiO 2 in sediments, have been regarded as one of useful proxies for paleoproductivity (Dymond et al, 1992;McManus et al, 1998;Pfeifer et al, 2001). This is based on that particulate Ba flux to sediments is controlled primarily by the surface production and that in general diagenetic regeneration is not significant (Dymond et al, 1992;Paytan and Kastner, 1996).…”

Section: Implications Of Depositional Environment and Origin Of Beddementioning

confidence: 99%

Biogeochemical signatures preserved in ancient siliceous sediments; new perspectives to Triassic radiolarian bedded chert compositions

et al. 2006

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Major and minor elements of successively collected 70 Middle Triassic radiolarian bedded cherts from the Mino Belt in central Japan were studied. In order to reveal pre-diagenetic, primary geochemical signatures related to marine biogeochemical cycles, composite data of chert-shale couplets in addition to raw data were examined. The results show that Mn, Cu, Sr, Ba and P were supplied significantly by non-lithogenic excess fractions. Positive correlation with SiO 2 / TiO 2 suggests that accumulations of Ba, Sr, Mn and Cu were closely related to sedimentation of biogenic silica; Mn and Cu were probably incorporated into oxides, whereas Ba into barite. Relationship between SiO 2 /TiO 2 and excess-Ba, proxy for surface productivity implies that regeneration of silica from sinking radiolarian tests was not significant. This may have been caused by an expected relatively short travel time of radiolarian tests from the ocean surface to the bottom, reflecting their large size compared with diatoms. Positive correlations between CaO and P 2 O 5 imply that apatite species are host phases for P and Ca. Although conodont composed of apatite is abundant in both chert and shale, their CaO/P 2 O 5 ratio differs markedly from those of cherts and shales. Other apatite species, possibly carbonate apatite of diagenetic origin, are present in the bedded cherts and contribute to excess-P accumulation. Early diagenesis is believed to have modified only slightly primary geochemical features of the studied bedded cherts. This suggests relatively oxic depositional environment for the bedded cherts, under which regeneration of redox sensitive elements were not active.

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Reconstruction of primary productivity from the barium contents in surface sediments of the South Atlantic Ocean

Cited by 63 publications

References 26 publications

Selective preservation of organic matter in marine environments; processes and impact on the sedimentary record

Selective preservation of organic matter in marine environments; processes and impact on the sedimentary record

Geochemical distribution patterns as indicators for productivity and terrigenous input off NW Africa

Biogeochemical signatures preserved in ancient siliceous sediments; new perspectives to Triassic radiolarian bedded chert compositions

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