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      Data report: X-ray fluorescence scanning of Site U1427, Yamato Basin, Expedition 346

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      Proceedings of the IODP
      International Ocean Discovery Program

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          Abstract

          Semiquantitative elemental results from X-ray fluorescence (XRF) scanning of sediment cores collected from Integrated Ocean Drilling Program (IODP) Site U1427 in the Yamato Basin off the west coast of Japan are presented. XRF elemental data were collected every 1 cm from core sections located on the stratigraphically continuous Site U1427 spliced composite record over the depth interval from 13.32 to 116.71 m core composite depth below seafloor, Method D (CCSF-D). We report raw element intensities (counts) at subcentennial resolution for Al, Si, K, Ca, Ti, Fe, Br, Sr, and Zr and identify covariation patterns consistent with lithofacies variations that have been previously correlated with glacial–interglacial changes in sea level, sedimentation, and water-column productivity. Our high-resolution XRF scanning of Site U1427 sediments was conducted to aid in interpretation of sedimentation and facilitate more detailed paleoceanographic studies at this location.

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          Southward migration of the intertropical convergence zone through the Holocene.

          Titanium and iron concentration data from the anoxic Cariaco Basin, off the Venezuelan coast, can be used to infer variations in the hydrological cycle over northern South America during the past 14,000 years with subdecadal resolution. Following a dry Younger Dryas, a period of increased precipitation and riverine discharge occurred during the Holocene "thermal maximum." Since approximately 5400 years ago, a trend toward drier conditions is evident from the data, with high-amplitude fluctuations and precipitation minima during the time interval 3800 to 2800 years ago and during the "Little Ice Age." These regional changes in precipitation are best explained by shifts in the mean latitude of the Atlantic Intertropical Convergence Zone (ITCZ), potentially driven by Pacific-based climate variability. The Cariaco Basin record exhibits strong correlations with climate records from distant regions, including the high-latitude Northern Hemisphere, providing evidence for global teleconnections among regional climates.
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            Rapid Changes in the Hydrologic Cycle of the Tropical Atlantic During the Last Glacial

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              Influence of the water content on X-ray fluorescence core-scanning measurements in soft marine sediments

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                Author and article information

                Journal
                10.2204/iodp.proc.346.2015
                Proceedings of the IODP
                International Ocean Discovery Program
                1930-1014
                03 September 2020
                Article
                10.2204/iodp.proc.346.206.2020
                c6ab4acd-5167-4067-b88b-7e0b9dc35eaf

                This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

                History

                Earth & Environmental sciences,Oceanography & Hydrology,Geophysics,Chemistry,Geosciences

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