Weathering of basalt in an arctic climate

Mørup, Steen; Saksager, O.; Madsen, M. B.; Bentzon, M. D.; Koch, Christian

doi:10.1007/bf02405798

Cited by 6 publications

(3 citation statements)

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“…Goethite is not commonly studied in Arctic sediments, and we cannot conclude on its origin in sediment cores from the Northwind Ridge, as well as other sites from the central Arctic Ocean, at this time. Goethite has been documented in soils of northern Alaska (Hill & Tedrow 1961), and has been described as a product of basalt weathering in Greenland (Mørup et al 1990). It can also form diagenetically in marine sediments, and may even be the dominant diagenetic precipitate in these environments (van der Zee et al 2003).…”

Section: Illite and Goethite: Glacial/deglacial Pulses From North-wesmentioning

confidence: 99%

Clay mineral cycles identified by diffuse spectral reflectance in Quaternary sediments from the Northwind Ridge: implications for glacial–interglacial sedimentation patterns in the Arctic Ocean

Yurco¹,

Ortiz²,

Polyak³

et al. 2010

Polar Research

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A Quaternary record of fine-grained sediment composition is used to investigate Arctic Ocean climate variability on glacial-interglacial time scales. Diffuse spectral reflectance data from sediment core P1-92AR-P25 from the Northwind Ridge, north of Alaska, demonstrates cyclic variations in mineralogy. Varimaxrotated R-mode factor analysis of down-core data revealed three major mineralogical assemblages, which were then compared with the content of manganese, a proxy for basin ventilation, and thus glacial-interglacial cycles. Results indicate that factor 1, a smectite + chlorite clay assemblage, was delivered to the core site during interglacials, either by fluvial discharge or sea-ice drift from Siberian rivers or inflow from the Bering Sea. Factor 2, an illite + goethite assemblage, is related to glacial periods, and was probably transported from the Laurentide Ice Sheet by icebergs or meltwater. Factor 3, glauconite, might have been sourced from the North Slope region of Alaska during deglacial intervals, or from dolomites associated with Laurentide iceberg-discharge pulses. The observed variations in sediment source and transport mechanisms arise from glacial-interglacial changes in sea level, the size of the terrestrial ice sheets surrounding the Arctic Ocean, the extent of sea-ice cover and altered atmospheric circulation. The reconstructed glacialinterglacial circulation patterns from the Late Quaternary show some similarity with modern circulation changes presumably related to the monthly-to decadally-fluctuating Arctic Oscillation. However, because the Arctic Oscillation operates on much shorter time scales, further research is necessary to better understand the driving mechanism for the changes observed over glacialinterglacial cycles, and the potential role of ocean-atmospheric interaction.

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Section: Illite and Goethite: Glacial/deglacial Pulses From North-wesmentioning

confidence: 99%

Clay mineral cycles identified by diffuse spectral reflectance in Quaternary sediments from the Northwind Ridge: implications for glacial–interglacial sedimentation patterns in the Arctic Ocean

Yurco¹,

Ortiz²,

Polyak³

et al. 2010

Polar Research

View full text Add to dashboard Cite

show abstract

“…Goethite has been documented in soils of northern Alaska (Hill & Tedrow 1961), and has been described as a product of basalt weathering in Greenland (Mørup et al 1990). It can also form diagenetically in marine sediments, and may even be the dominant diagenetic precipitate in these environments (van der Zee et al 2003).…”

Section: Illite and Goethite: Glacial/deglacial Pulses From North-wesmentioning

confidence: 99%

Clay mineral cycles identified by diffuse spectral reflectance in Quaternary sediments from the Northwind Ridge: implications for glacial–interglacial sedimentation patterns in the Arctic Ocean

et al. 2010

View full text Add to dashboard Cite

“…Thus, the pathways via which iron minerals are formed and modified in a soil are poorly understood. Weathering perturbations to iron mineralogy result in measurable modifications to a basalt's magnetic properties and on this basis rock magnetic parameters have been used as paleoclimatic proxies (Marshall and cox 1972;Schwertmann 1985;Fine et al, 1989;Morup et al, 1990;Zhou et al, 1990;Maher and Thompson, 1992, 1994Koch et al, 1995;Han et al, 1996;Maher et al, 2003;Liu et al, 2005a;Maher 2007;Navarre-Sitchler and Brantley 2007;Borges et al, 2011;Dietze et al, 2011;Long et al, 2011). Moreover, the rock magnetic investigation of basalts has provided key constraints for understanding the Martian environment (Barrón and Torrent, 2002;Gunnlaugsson et al, 2002Gunnlaugsson et al, , 2006Chevrier et al, 2006).…”

Section: Introductionmentioning

confidence: 99%