Sources and dispersal patterns of clay minerals in surface sediments from the continental-shelf areas off Alaska

Naidu, A. Sathy; Mowatt, T.C.

doi:10.1130/0016-7606(1983)94<841:sadpoc>2.0.co;2

Cited by 115 publications

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“…2e). These results are consistent with earlier studies showing that illite is a common clay mineral in Arctic sediments (Kalinenko, 2001;Darby et al, 2011), whereas chlorite is more abundant in the Bering Sea and the Chukchi shelf areas influenced by the BSI (Naidu and Mowatt, 1983;Kalinenko, 2001;Nwaodua et al, 2014;Kobayashi et al, 2016).…”

Section: Surface Sediments Of the Beaufort Seasupporting

confidence: 82%

“…Chlorite occurs abundantly near the Bering Sea coasts of Alaska, Canada, and the Aleutian Islands (Griffin and Goldberg, 1963). The chlorite / illite ratio is higher in the bed load of rivers and deltaic sediments from southwestern Alaska than from northern Alaska and East Siberia, reflecting differences in the geology of the drainage basins (Naidu and Mowatt, 1983). Because chlorite grains are more mobile than illite grains under conditions of intense hydrodynamic activity, chlorite grains are transported a long distance from the northern Bering Sea to the Chukchi Sea via the Bering Strait (Kalinenko, 2001).…”

Section: Mineral Distribution In the Chukchi Sea Sedimentsmentioning

confidence: 99%

“…Kaolinite is generally a minor component of clays in the western Arctic but relatively abundant in the Northwind Ridge and Mackenzie Delta areas where the BG circulation exerts an influence (Naidu and Mowatt, 1983;Kobayashi et al, 2016). Kaolinite in the Northwind Ridge originated from ancient rocks exposed on the North Slope and was delivered by water or sea ice via the Beaufort Gyre circulation (Kobayashi et al, 2016).…”

Section: Mineral Distribution In the Chukchi Sea Sedimentsmentioning

confidence: 99%

“…Spatial variation in mineral composition of surficial sediments along the western Arctic margin has been investigated in a number of studies using different methodological approaches but showing an overall consistent picture (e.g., Naidu et al, 1982;Naidu and Mowatt, 1983;Wahsner et al, 1999;Kalinenko, 2001;Viscosi-Shirley et al, 2003;Darby et al, 2011;Kobayashi et al, 2016). A recent study of mineral distribution in sediments from the Chukchi Sea and adjacent areas of the Arctic Ocean and the Bering Sea suggests that the quartz / feldspar (Q / F) ratio is higher on the North American than on the Siberian side of the western Arctic ( Fig.…”

Section: Mineral Distribution In the Chukchi Sea Sedimentsmentioning

confidence: 99%

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Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea

et al. 2017

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Abstract. The Beaufort Gyre (BG) and the Bering Strait inflow (BSI) are important elements of the Arctic Ocean circulation system and major controls on the distribution of Arctic sea ice. We report records of the quartz / feldspar and chlorite / illite ratios in three sediment cores from the northern Chukchi Sea, providing insights into the long-term dynamics of the BG circulation and the BSI during the Holocene. The quartz / feldspar ratio, interpreted as a proxy of the BG strength, gradually decreased during the Holocene, suggesting a long-term decline in the BG strength, consistent with an orbitally controlled decrease in summer insolation. We propose that the BG rotation weakened as a result of the increasing stability of sea-ice cover at the margins of the Canada Basin, driven by decreasing insolation. Millennial to multi-centennial variability in the quartz / feldspar ratio (the BG circulation) is consistent with fluctuations in solar irradiance, suggesting that solar activity affected the BG strength on these timescales. The BSI approximation by the chlorite / illite record, despite a considerable geographic variability, consistently shows intensified flow from the Bering Sea to the Arctic during the middle Holocene, which is attributed primarily to the effect of higher atmospheric pressure over the Aleutian Basin. The intensified BSI was associated with decrease in sea-ice concentrations and increase in marine production, as indicated by biomarker concentrations, suggesting a major influence of the BSI on sea-ice and biological conditions in the Chukchi Sea. Multi-century to millennial fluctuations, presumably controlled by solar activity, were also identified in a proxy-based BSI record characterized by the highest age resolution.

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Section: Surface Sediments Of the Beaufort Seasupporting

confidence: 82%

Section: Mineral Distribution In the Chukchi Sea Sedimentsmentioning

confidence: 99%

Section: Mineral Distribution In the Chukchi Sea Sedimentsmentioning

confidence: 99%

Section: Mineral Distribution In the Chukchi Sea Sedimentsmentioning

confidence: 99%

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Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea

et al. 2017

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“…The 168 chlorite/illite ratio is higher in the bed load of rivers and deltaic sediments from 169 southwestern Alaska than from northern Alaska and East Siberia, reflecting differences 170 in the geology of the drainage basins (Naidu and Mowatt, 1983). Because chlorite 171 grains are more mobile than illite grains under conditions of intense hydrodynamic 172 activity, chlorite grains are transported a long distance from the northern Bering Sea to 173 the Chukchi Sea via the Bering Strait (Kalinenko, 2001).…”

Section: ; Kobayashi Et Al 2016) Chlorite Occurs Abundantly Nementioning

confidence: 99%

Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea

Yamamoto¹,

Nam²,

Polyak³

et al. 2016

Preprint

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20The Beaufort Gyre (BG) and the Bering Strait inflow (BSI) are important elements of 21 the Arctic Ocean circulation system and major controls on the distribution of Arctic sea 22 ice. We report records of the quartz/feldspar and chlorite/illite ratios in two sediment 23 cores from the northern Chukchi Sea providing insights into the long-term dynamics of 24 Clim. Past Discuss., doi:10.5194/cp-2016Discuss., doi:10.5194/cp- -105, 2016 Manuscript under review for journal Clim. Past insolation. We suppose that the BG rotation weakened as a result of increasing stability 28 of sea-ice cover at the margins of the Canada Basin, driven by decreasing insolation. 29Millennial to multi-centennial variability in the quartz/feldspar ratio (the BG 30 circulation) is consistent with fluctuations in solar irradiance, suggesting that solar 31 activity affected the BG strength on these timescales. The BSI, approximated by the 32 chlorite/illite record, shows intensified flow from the Bering Sea to the Arctic during 33 the middle Holocene, which is attributed primarily to the effect of an overall weaker 34 Aleutian Low. This middle Holocene strengthening of the BSI was coeval with intense 35 subpolar gyre circulation in the North Atlantic. We propose that the BSI is linked with 36

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Mineralogical, geochemical, and magnetic signatures of surface sediments from the Canadian Beaufort Shelf and Amundsen Gulf (Canadian Arctic)

Gamboa

Montero‐Serrano

St‐Onge

et al. 2017

Geochem Geophys Geosyst

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Mineralogical, geochemical, magnetic, and siliciclastic grain‐size signatures of 34 surface sediment samples from the Mackenzie‐Beaufort Sea Slope and Amundsen Gulf were studied in order to better constrain the redox status, detrital particle provenance, and sediment dynamics in the western Canadian Arctic. Redox‐sensitive elements (Mn, Fe, V, Cr, Zn) indicate that modern sedimentary deposition within the Mackenzie‐Beaufort Sea Slope and Amundsen Gulf took place under oxic bottom‐water conditions, with more turbulent mixing conditions and thus a well‐oxygenated water column prevailing within the Amundsen Gulf. The analytical data obtained, combined with multivariate statistical (notably, principal component and fuzzy c‐means clustering analyses) and spatial analyses, allowed the division of the study area into four provinces with distinct sedimentary compositions: (1) the Mackenzie Trough‐Canadian Beaufort Shelf with high phyllosilicate‐Fe oxide‐magnetite and Al‐K‐Ti‐Fe‐Cr‐V‐Zn‐P contents; (2) Southwestern Banks Island, characterized by high dolomite‐K‐feldspar and Ca‐Mg‐LOI contents; (3) the Central Amundsen Gulf, a transitional zone typified by intermediate phyllosilicate‐magnetite‐K‐feldspar‐dolomite and Al‐K‐Ti‐Fe‐Mn‐V‐Zn‐Sr‐Ca‐Mg‐LOI contents; and (4) mud volcanoes on the Canadian Beaufort Shelf distinguished by poorly sorted coarse‐silt with high quartz‐plagioclase‐authigenic carbonate and Si‐Zr contents, as well as high magnetic susceptibility. Our results also confirm that the present‐day sedimentary dynamics on the Canadian Beaufort Shelf is mainly controlled by sediment supply from the Mackenzie River. Overall, these insights provide a basis for future studies using mineralogical, geochemical, and magnetic signatures of Canadian Arctic sediments in order to reconstruct past variations in sediment inputs and transport pathways related to late Quaternary climate and oceanographic changes.

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Sources and dispersal patterns of clay minerals in surface sediments from the continental-shelf areas off Alaska

Cited by 115 publications

References 0 publications

Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea

Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea

Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea

Mineralogical, geochemical, and magnetic signatures of surface sediments from the Canadian Beaufort Shelf and Amundsen Gulf (Canadian Arctic)

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