High-resolution Quaternary record of marine organic carbon content in the hemipelagic sediments of the Japan Sea from bromine counts measured by XRF core scanner

Seki, Arisa; Tada, Ryuji; Kurokawa, Syuhei; Murayama, Masafumi

doi:10.1186/s40645-018-0244-z

Cited by 32 publications

(23 citation statements)

References 42 publications

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“…The b* color parameter, an indicator of diatom accumulation in sediments, Сa/Fe ratio, related to calcareous phytoplankton production, and chlorin content, responsible for chlorophyll production, are all proxies for surface water paleoproductivity in the NW Pacific and marginal seas (Nürnberg and Tiedemann, 2004;Riethdorf et al, 2013). Br concentration is an excellent indicator of the total organic content of sediment (Riethdorf et al, 2013;Seki et al, 2019). Based on variations in the productivity parameters in the Okhotsk and Bering Seas and in the ocean waters off Kamchatka, regional paleoproductivity of the studied areas increased during periods of climate warming and dropped during glacial periods (Nürnberg and Tiedemann, 2004;Gorbarenko et al, 2005;Riethdorf et al, 2013).…”

Section: Age Modelmentioning

confidence: 99%

Middle to late Pleistocene record of explosive volcanic eruptions in marine sediments offshore Kamchatka (Meiji Rise, NW Pacific)

Derkachev

Gorbarenko

Пономарева

et al. 2019

J Quaternary Science

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This paper presents the first detailed study of a late Pleistocene marine tephra sequence from the NW Pacific, downwind from the Kamchatka volcanic arc. Sediment core SO201-2-40, located on the Meiji Rise~400 km offshore the peninsula, includes 25 tephras deposited within the last 215 ka. Volcanic glass from the tephras was characterized using single-shard electron microprobe analysis and laser ablation inductively coupled mass spectrometry. The age of tephras was derived from a new age model based on paleomagnetic and paleoclimate studies. Geochemical correlation of distal tephras to Kamchatkan pyroclastic deposits allowed the identification of tephras from the Karymsky, Gorely, Opala and Shiveluch eruptive centers. Three of these tephras were also correlated to other marine and terrestrial sites and hence are identified as the best markers for the north-west Pacific region. These are an early Holocene tephra from the Karymsky caldera (~8.7 ka) and two tephras falling into the Marine Isotope Stage (MIS) 6 glacial time: an MIS 6.4 tephra from Shiveluch (~141 ka) and the MIS 6.5 Rauchua tephra (~175 ka) from Karymsky. The data presented in this study can be used in paleovolcanological and paleoceanographic reconstructions. recovered from core SO201-2-40 on the Meiji Rise (NW Pacific) (Fig. 1). The record includes 25 tephra layers and lenses deposited during the last~215 ka. We present an age model for the core based on paleomagnetic and stratigraphic

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Section: Age Modelmentioning

confidence: 99%

Middle to late Pleistocene record of explosive volcanic eruptions in marine sediments offshore Kamchatka (Meiji Rise, NW Pacific)

Derkachev

Gorbarenko

Пономарева

et al. 2019

J Quaternary Science

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“…XRF scanning can measure many major and minor elements simultaneously while preserving the sediment intact (e.g., Croudace et al, 2006;Haschke, 2006;Haschke et al, 2002;Kido et al, 2006;Koshikawa et al, 2003;Richter et al, 2006;Wien et al, 2005). With measurements able to be acquired as close as every 100 μm of core, the near-continuous element records can then be related to past changes in Earth and ocean processes that affect the composition of the sediment (e.g., Hennekam et al, 2019;Peterson et al, 2000;Seki et al, 2019;Ziegler et al, 2013). Supporting Information:…”

Section: Introductionmentioning

confidence: 99%

Intercomparison of XRF Core Scanning Results From Seven Labs and Approaches to Practical Calibration

Dunlea

Murray

Tada

et al. 2020

Geochem Geophys Geosyst

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X‐ray fluorescence (XRF) scanning of marine sediment has the potential to yield near‐continuous and high‐resolution records of elemental abundances, which are often interpreted as proxies for paleoceanographic processes over different time scales. However, many other variables also affect scanning XRF measurements and convolute the quantitative calibrations of element abundances and comparisons of data from different labs. Extensive interlab comparisons of XRF scanning results and calibrations are essential to resolve ambiguities and to understand the best way to interpret the data produced. For this study, we sent a set of seven marine sediment sections (1.5 m each) to be scanned by seven XRF facilities around the world to compare the outcomes amidst a myriad of factors influencing the results. Results of raw element counts per second (cps) were different between labs, but element ratios were more comparable. Four of the labs also scanned a set of homogenized sediment pellets with compositions determined by inductively coupled plasma‐optical emission spectrometry (ICP‐OES) and ICP‐mass spectrometry (MS) to convert the raw XRF element cps to concentrations in two ways: a linear calibration and a log‐ratio calibration. Although both calibration curves are well fit, the results show that the log‐ratio calibrated data are significantly more comparable between labs than the linearly calibrated data. Smaller‐scale (higher‐resolution) features are often not reproducible between the different scans and should be interpreted with caution. Along with guidance on practical calibrations, our study recommends best practices to increase the quality of information that can be derived from scanning XRF to benefit the field of paleoceanography.

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“…The main sources of organic matter in marine sediments include the active pools of carbon in the oceans, atmosphere, landmasses and carbon pools that cycle on much longer, geological timescale (Pedrosa-Pàmies et al, 2015). However, in coastal marine sediments, organic matter is largely a mixture of terrestrial and marine organic matter and varies along coastal gradients with highest contents inshore than offshore (Krishna et al, 2013;Seki, Tada, Kurokawa, & Murayama, 2019). In this study, organic carbon content in sediments showed a gradual decrease along onshore-offshore gradient in the harbour channel containing clay-silt, sand and gravel sediments ( Figure 3) with medium content in sand-silt.…”

Section: Organic Carbon Distributionmentioning

confidence: 47%

Assessment of Sediment and Benthic Macrofauna Distribution at Dar es Salaam Harbour Channel

Mwakisunga¹,

Machiwa²,

Pratap³

2020

GEP

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Sediment and macrobenthic fauna distribution at Dar es Salaam harbour channel were investigated to attest the influence of sediment grain size distribution and total organic carbon contents on benthic macrofauna dominance and diversity. Sampling campaign was conducted from January to April, 2019 in 25 sampling stations along the channel. Sediment grain sizes ranged between 0.7405 and 0.00273 mm with an average of 0.0804 mm classified as medium silt. Sediment distribution showed an onshore-offshore pattern consisting of fine dark clay-silt sediments in the southern part of the harbour close to Mwalimu Nyerere Bridge, medium (sandy) at the harbour and coarse sandy offshore. Five classes of macrofauna were identified with sedentary Polychaetes (Diopatra cuprea) found in tubes and free forms being dominant in most of the sediment types, however more abundant in clay-silt. High species diversity index values were encountered in sediments with medium total organic carbon (TOC) and sediment grain sizes (sand-silt). Apparently, low species similarity indices were observed in all sediment type indicating significant dissimilarities in species composition among sediment grain sizes. Thus, the distribution of benthic macrofauna species along Dar es Salaam harbour channel is strongly influenced by the sediment grain sizes and organic carbon contents in sediments.

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High-resolution Quaternary record of marine organic carbon content in the hemipelagic sediments of the Japan Sea from bromine counts measured by XRF core scanner

Cited by 32 publications

References 42 publications

Middle to late Pleistocene record of explosive volcanic eruptions in marine sediments offshore Kamchatka (Meiji Rise, NW Pacific)

Middle to late Pleistocene record of explosive volcanic eruptions in marine sediments offshore Kamchatka (Meiji Rise, NW Pacific)

Intercomparison of XRF Core Scanning Results From Seven Labs and Approaches to Practical Calibration

Assessment of Sediment and Benthic Macrofauna Distribution at Dar es Salaam Harbour Channel

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