A new local marine reservoir correction for the last deglacial period in the Sanriku region, northwestern North Pacific, based on radiocarbon dates from the Towada-Hachinohe (To-H) tephra

Ikehara, Ken; Ohkushi, Ken^|^rsquo;ichi; Noda, Atsushi; Danhara, Tohru; Yamashita, Tohru

doi:10.4116/jaqua.52.127

Cited by 17 publications

(5 citation statements)

References 44 publications

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“…2). For instance, the documented tephra age is ad 915, whereas the bulk OC 14 C age just below the tephra layer is 3139 ± 120 yr bp , clearly exceeding the estimated local marine reservoir age of 830 yr 39 . Background sedimentation (i.e., excluding the event layers) is characterized by quasi-linear relationships between bulk OC 14 C age vs. sediment depth (Fig.…”

Section: Discussionmentioning

confidence: 79%

Tectonically-triggered sediment and carbon export to the Hadal zone

et al. 2018

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Sediments in deep ocean trenches may contain crucial information on past earthquake history and constitute important sites of carbon burial. Here we present 14C data on bulk organic carbon (OC) and its thermal decomposition fractions produced by ramped pyrolysis/oxidation for a core retrieved from the >7.5 km-deep Japan Trench. High-resolution 14C measurements, coupled with distinctive thermogram characteristics of OC, reveal hemipelagic sedimentation interrupted by episodic deposition of pre-aged OC in the trench. Low δ13C values and diverse 14C ages of thermal fractions imply that the latter material originates from the adjacent margin, and the co-occurrence of pre-aged OC with intervals corresponding to known earthquake events implies tectonically triggered, gravity-flow-driven supply. We show that 14C ages of thermal fractions can yield valuable chronological constraints on sedimentary sequences. Our findings shed new light on links between tectonically driven sedimentological processes and marine carbon cycling, with implications for carbon dynamics in hadal environments.

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Section: Discussionmentioning

confidence: 79%

Tectonically-triggered sediment and carbon export to the Hadal zone

et al. 2018

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“…The following are other studies in the literature describing the major elemental composition of volcanic glass shards of the Quaternary-Neogene tephras: the Holocene to the late Middle Pleistocene: Aoki and Arai (2000), Aoki et al ( , 2008, Nagahashi et al (2004, Aoki and Machida (2006), and Nagahashi and Ishiyama (2009); the Middle Pleistocene to the Pliocene: Nagahashi et al (2000), Tamura et al (2008), Kotaki et al (2011), andSuzuki et al (2011); and the Miocene: Hiranaka et al (2007). Major marine tephra studies around the Japanese islands in locations other than in the Japan Sea include the following: general: Machida and Arai (1983, 1988, 2003 and Furuta et al (1986); NW Pacific: Fujioka (1983), Cambray et al (1990), Aoki and Arai (2000), Aoki et al ( , 2008, Aoki and Machida (2006), Aoki and Ohkushi (2006), Suganuma et al (2006), Aoki (2008), and Ikehara et al (2013); Izu-Bonin: Fujioka et al (1992aFujioka et al ( , 1992b and Nishimura et al (1992); South of Japan: Ikehara et al (2006Ikehara et al ( , 2011 and Kutterolf et al (2014); East China Sea: Cambray et al (1990) and Moriwaki et al (2011). Recently, Kimura et al (2015) determined 10 major and 33 trace elements and Pb isotope ratios for dacitic to rhyolitic glass shards from 80 widespread tephras erupted during the past 5 Ma.…”

Section: Reviewsmentioning

confidence: 99%

“…Consequently, because tephra forms geologically synchronous key beds, the magnitude of the marine reservoir effect at the time of eruption can be established by comparing the terrestrial and marine radiocarbon dates ( Fig. 5; Sikes et al 2000;Siani et al 2001;Ascough et al 2004Ascough et al , 2005Eiriksson et al 2004;Hutchinson et al 2004;Larsen et al 2006;Ikehara et al 2011Ikehara et al , 2013.…”

Section: Tephra As a Paleoceanographic And Paleoclimatological Toolmentioning

confidence: 99%

Marine tephra in the Japan Sea sediments as a tool for paleoceanography and paleoclimatology

Ikehara

2015

Prog. in Earth and Planet. Sci.

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Tephra is a product of large and explosive volcanic events and can travel thousands of kilometers before deposition. Consequently, tephra deposits are common in terrestrial, lacustrine, marine, and glacial environments. Because tephra deposition is a geologically synchronous event, tephras constitute important isochrones in the Quaternary sequence, not only in Japan but also throughout the northwest Pacific and its marginal seas. As a result, establishing the chronostratigraphic order of tephra deposits is an effective tool for assessing local and regional stratigraphies and for correlating events among sites. For example, tephrostratigraphy can provide precise chronological constraints for other stratigraphic data, such as magneto-and biostratigraphic data. Spatiotemporal variability in the occurrence and geochemistry of tephras can also be used to trace the magmatic evolution of island arcs and their relationships to regional tectonics. In a paleoclimatic context, tephra deposits allow the correlation of past climate events among terrestrial, lacustrine, and marine environments. Tephrochronology is also a fundamental element used in reconstructing the marine reservoir effect, where the ages of tephra in marine and terrestrial settings are compared. Therefore, tephra is a valuable tool not only in stratigraphy, chronology, and volcanology but also in paleoceanography and paleoclimatology.

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“…1), having been found in numerous marine cores, close to the Japan Trench, in the western North Pacific Ocean (e.g. Aoki and Arai, 2000;Machida, 2006:, 2006;Ikehara et al, 2013).…”

Section: Gs-21a Towada To-h 15706 ± 226 a B2kmentioning

confidence: 99%