Provenance of Holocene sediment on the Chukchi-Alaskan margin based on combined diffuse spectral reflectance and quantitative X-Ray Diffraction analysis

Ortiz, Joseph D.; Polyak, Leonid; Grebmeier, Jacqueline M.; Darby, Dennis A.; Eberl, Dennis D.; Naidu, Sathy; Nof, Doron

doi:10.1016/j.gloplacha.2009.03.020

Cited by 87 publications

(109 citation statements)

References 46 publications

(58 reference statements)

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“…In the surface sediments of the Chukchi Sea, the CK / I ratio shows a good correlation with the C / I ratio, indicating that both ratios can be used as a provenance index for the BSI (Kobayashi et al, 2016). Ortiz et al (2009) constructed the first chlorite-based Holocene record of the BSI by quantifying the total chlo-rite plus muscovite abundance based on diffuse spectral reflectance of sediments from a northeastern Chukchi Sea core. The record shows a prominent intensification of the BSI in the middle Holocene.…”

Section: Mineral Distribution In the Chukchi Sea Sedimentsmentioning

confidence: 99%

“…4 and 6 ka (Supplement Fig. S1; Ortiz et al, 2009). However, this pattern was not confirmed by our XRD analysis, where XRD intensities of chlorite and muscovite (detected as illite in this study) as well as the C / I and CK / I ratios did not show an identifiable enrichment between 4 and 6 ka (Supplement Fig.…”

Section: Holocene Changes In the Bering Strait Inflowmentioning

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: Mineral Distribution In the Chukchi Sea Sedimentsmentioning

confidence: 99%

Section: Holocene Changes In the Bering Strait Inflowmentioning

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

et al. 2017

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“…See Ortiz et al (2009) for detailed procedures. Measurements were made in the visible light spectrum (400-700 nm), and are used as a reference for our sample subset.…”

Section: Methodsmentioning

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

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“…Ortiz et al 2009) for sediment study. Hering (1964) demonstrated that color stimuli in the retina can be translated into distinctions between light and dark (L* -lightness) ranging from 0 (absolute black) to 100 (absolute white), a red (+a*) to green axis (-a*), and a yellow (+b*) to blue axis (-b*).…”

Section: Introductionmentioning

confidence: 99%

Mineralogical and geochemical influences on sediment color of Amazon wetlands analyzed by visible spectrophotometry

et al. 2013

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Based on sedimentological and geochemical data, this work relates spectrophotometric measurements with sediment composition and its application in palaeoecological studies of Amazon wetlands. The CIELAB values are directly related to mineralogical and chemical composition, mostly involving quartz, iron oxyhydroxides and sulfides (e.g. pyrite), and total organic carbon. Total organic carbon contents between 0.4-1%, 1-2%, 3-5% and 15-40% were related to L* (lightness) data of 27, 26-15, 7-10 and 7 or less, respectively. The CIELAB values of a deposit in Marabá, Pará, were proportional to variations in quartz and total organic carbon contents, but changes in zones of similar color, mainly in the +a* (red) and +b* (yellow) values of deposits in Calçoene, Amapá and Soure, Pará, indicate a close relationship between total organic carbon content and iron oxyhydroxides and sulfides. Furthermore, the Q7/4 diagram (ratio between the % reflectance value at 700 nm to that at 400 nm, coupled with L*) indicated iron-rich sediments in the bioturbated mud facies of the Amapá deposit, bioturbated mud and bioturbated sand facies of Soure deposit, and cross-laminated sand and massive sand facies of the Marabá core. Also, organicrich sediments were found in the bioturbated mud facies of the Amapá deposit, lenticular heterolithic and bioturbated mud facies of the Soure deposit, and laminated mud and peat facies of the Marabá deposit. At the Marabá site, the data suggest an autochthonous influence with peat formation. The coastal wetland sites at Marajó and Amapá represent the development of a typical tidal flat setting with sulfide and iron oxyhydroxides formation during alternated flooding and drying. KEYWORDS: Sedimentology, Amazon region, Munsell color systems, Mineralogy, chemical composition.Influências mineralógicas e geoquímicas na cor dos sedimentos das zonas úmidas da Amazônia analisada através da espectrofotometria no visível RESUMO Com base em dados sedimentológicos e geoquímicos, este trabalho relaciona medições espectrofotométricas com a composição do sedimento, e sua aplicação em estudos paleoecológicos das áreas alagáveis da Amazônia. Os dados CIELAB estão diretamente relacionados à composição mineralógica e química dos sedimentos, especialmente quartzo, oxihidróxidos e sulfetos de ferro, e carbono orgânico total. Conteúdos de carbono orgânico total entre 0,4-1%, 1-2%, 3-5% e 15-40% foram relacionados a dados de L* (luminosidade) de 27, 26-15, 7-10 e 7 ou menos, respectivamente. Os valores CIELAB de um depósito com turfa em Marabá, Pará, foram proporcionais a variações no conteúdo de quartzo e carbono orgânico total, mas mudanças nas zonas de cores similares, principalmente nos valores de +a* (vermelho) e +b* (amarelo), ao longo de outros depósitos em Calçoene, Amapá e Soure, Pará, indicam uma relação muito próxima entre os conteúdos de carbono orgânico total, oxihidróxidos e sulfetos de ferro. Além disso, o diagrama Q7/4 (razão entre valores percentuais de refletância em 700 nm e 400 nm, juntamente com dados ...

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Provenance of Holocene sediment on the Chukchi-Alaskan margin based on combined diffuse spectral reflectance and quantitative X-Ray Diffraction analysis

Cited by 87 publications

References 46 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

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

Mineralogical and geochemical influences on sediment color of Amazon wetlands analyzed by visible spectrophotometry

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