Geochemistry of surface sediments from the fjords of Northern Chilean Patagonia (44–47°S): Spatial variability and implications for paleoclimate reconstructions

Bertrand, Sébastien; Hughen, Konrad A; Sepúlveda, Julio; Pantoja, Silvio

doi:10.1016/j.gca.2011.10.028

Cited by 67 publications

(84 citation statements)

References 84 publications

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“…In accordance with findings from the Trondheimsfjord in mid-Norway and in northern Chilean fjords (Bertrand et al, 2012;Faust et al, 2014b), the strong positive correlation between Ca and calcite (r = 0.96, p < 0.01, -0.8, p < 0.01, n = 40) to any terrigenous element (as e.g. Al, Fe, Ti and Si) indicates marine carbonate productivity to be the main calcite and Ca source in all three fjords.…”

Section: Ca and Calcite: Marine Productivity Proxiessupporting

confidence: 87%

“…4). In accordance with the environmental setting in Patagonian fjords (Bertrand et al, 2012) these results suggest that the distribution of Si, Zr, Hf and also Ti in the surface sediments of the Tysfjord (and Tysfjord is relatively low. This is likely due to the small drainage area and the lack of large rivers entering the fjord.…”

Section: Connection Between Terrigenous Elements and Water Depthsupporting

confidence: 82%

“…Bertrand et al, 2012;Brendryen et al, 2015;Faust et al, 2014a;Wehrmann et al, 2014;Zabel et al, 2001). Moreover, to avoid dilution and grain size effects, we discuss the spatial distribution of these elements in the fjords as Al-based ratios (Bertrand et al, 2012;Faust et al, 2014b;Loring, 1990).…”

Section: Geochemistrymentioning

confidence: 97%

“…Studies from fjords in Chile (Bertrand et al, 2012;Sepúlveda et al, 2011;Silva et al, 2011), New Zealand (Hinojosa et al, 2014;Knudson et al, 2011;Smith et al, 2015), east Greenland (Andrews and Vogt, 2014) and Svalbard (Winkelmann and Knies, 2005) reported a significant influence of freshwater inflow on their geochemical composition and suggest a common decreasing gradient of terrigenous-derived organic-and inorganic material from the inner fjords towards the open ocean. In contrast to these findings, Munoz and Wellner (2016) found terrigenous deposits to occur predominantly in the outer bay of an Antarctic fjord.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Geochemical characterisation of northern Norwegian fjord surface sediments: A baseline for further paleo-environmental investigations

Faust

Scheiber

Fabian

et al. 2017

Continental Shelf Research

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Section: Ca and Calcite: Marine Productivity Proxiessupporting

confidence: 87%

Section: Connection Between Terrigenous Elements and Water Depthsupporting

confidence: 82%

Section: Geochemistrymentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Geochemical characterisation of northern Norwegian fjord surface sediments: A baseline for further paleo-environmental investigations

Faust

Scheiber

Fabian

et al. 2017

Continental Shelf Research

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“…The scanner was operated with 20 s scan times using a Mo X-Ray tube set to 30 kV and 45 mA. Here, we use the Zr counts as a proxy for sediment grain size in proximal environments following Bertrand et al (2012).…”

Section: Inorganic Geochemistrymentioning

confidence: 99%

Precipitation as the main driver of Neoglacial fluctuations of Gualas glacier, Northern Patagonian Icefield

et al. 2012

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Abstract. Glaciers are frequently used as indicators of climate change. However, the link between past glacier fluctuations and climate variability is still highly debated. Here, we investigate the mid-to late-Holocene fluctuations of Gualas Glacier, one of the northernmost outlet glaciers of the Northern Patagonian Icefield, using a multi-proxy sedimentological and geochemical analysis of a 15 m long fjord sediment core from Golfo Elefantes, Chile, and historical documents from early Spanish explorers. Our results show that the core can be sub-divided into three main lithological units that were deposited under very different hydrodynamic conditions. Between 5400 and 4180 cal yr BP and after 750 cal yr BP, sedimentation in Golfo Elefantes was characterized by the rapid deposition of fine silt, most likely transported by fluvio-glacial processes. By contrast, the sediment deposited between 4130 and 850 cal yr BP is composed of poorly sorted sand that is free of shells. This interval is particularly marked by high magnetic susceptibility values and Zr concentrations, and likely reflects a major advance of Gualas glacier towards Golfo Elefantes during the Neoglaciation. Several thin silt layers observed in the upper part of the core are interpreted as secondary fluctuations of Gualas glacier during the Little Ice Age, in agreement with historical and dendrochronological data. Our interpretation of the Golfo Elefantes glaciomarine sediment record in terms of fluctuations of Gualas glacier is in excellent agreement with the glacier chronology proposed for the Southern Patagonian Icefield, which is based on terrestrial (moraine) deposits. By comparing our results with independent proxy records of precipitation and sea surface temperature, we suggest that the fluctuations of Gualas glacier during the last 5400 yr were mainly driven by changes in precipitation in the North Patagonian Andes.

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Carbon cycling and burial in New Zealand's fjords

Hinojosa

Moy

Stirling

et al. 2014

Geochem. Geophys. Geosyst.

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Understanding carbon cycling in continental margin settings is critical for constraining the global carbon cycle. Here we apply a multiproxy geochemical approach to evaluate regional carbon cycle dynamics in six New Zealand fjords. Using carbon and nitrogen concentrations and isotopes, lipid biomarkers, and redoxsensitive element concentrations, we show that the New Zealand fjords have carbon-rich surface sediments in basins that promote long-term storage (i.e., semirestricted basins with sediment accumulation rates of up to 4 mm yr 21 ). Using d 13 C distributions to develop a mixing model, we find that organic carbon in fjord sediments is well-mixed from marine and terrestrial sources in down-fjord gradients. This is driven by high regional precipitation rates of >6 m yr 21 , which promote carbon accumulation in fjord basins through terrestrial runoff. In addition, we have identified at least two euxinic subbasins, based on uranium, molybdenum, iron, and cadmium enrichment, that contain >7% organic carbon. Because the strength and position of the Southern Hemisphere westerly winds control precipitation and fjord circulation, carbon delivery and storage in the region are intimately linked to westerly wind variability. We estimate that the fjord region (759 km 2 ) may be exporting up to 1.4 3 10 7 kgC yr 21 , outpacing other types of continental margins in rates of carbon burial by up to 3 orders of magnitude.

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Geochemistry of surface sediments from the fjords of Northern Chilean Patagonia (44–47°S): Spatial variability and implications for paleoclimate reconstructions

Cited by 67 publications

References 84 publications

Geochemical characterisation of northern Norwegian fjord surface sediments: A baseline for further paleo-environmental investigations

Geochemical characterisation of northern Norwegian fjord surface sediments: A baseline for further paleo-environmental investigations

Precipitation as the main driver of Neoglacial fluctuations of Gualas glacier, Northern Patagonian Icefield

Carbon cycling and burial in New Zealand's fjords

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