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Jaeger, J.M.; Gulick, S. P. S.; LeVay, L.J.; Asahi, Hirofumi; Bahlburg, Heinrich; Belanger, Christina L.; Berbel, Glaúcia Bueno Benedetti; Childress, L.B.; Cowan, Ellen A.; Drab, L.; Forwick, Matthias; Fukumura, Akemi; Ge, S.; Gupta, Sandeep K.

doi:10.2204/iodp.proc.341.2014

Cited by 6 publications

(22 citation statements)

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“…olarians that were present, the Pleistocene radiolarians were better preserved and more abundant (Jaeger et al, 2014). Preliminary biostratigraphic analysis at low resolution (> 10 m sampling interval) conducted during Expedition 341 revealed the existence of numerous barren intervals in cores retrieved from the site (Jaeger et al, 2014).…”

Section: Introductionmentioning

confidence: 98%

“…In order to clarify the relationship between tectonic and climate changes during the Neogene, Expedition 341 of the Integrated Ocean Drilling Program (IODP) retrieved sediment cores at five sites off the southern Gulf of Alaska (northeastern Pacific) between 29 May and 29 July 2013 (sites U1417 to U1421) (Jaeger et al, 2014;Gulick et al, 2015). The deep-sea sediments collected at Site U1417 span the time interval from the Pleistocene to the Miocene (Jaeger et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…The deep-sea sediments collected at Site U1417 span the time interval from the Pleistocene to the Miocene (Jaeger et al, 2014). Of particular interest in the retrieved cores are polycystine radiolarians, which are siliceous microorganisms that inhabit shallow, intermediate and deep waters (e.g., Renz, 1976;Anderson, 1983;Kling, 1979;Kling and Boltovskoy, 1995;Nimmergut and Abelmann, 2002;Okazaki et al, 2004;Suzuki and Not, 2015;Matsuzaki et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Of particular interest in the retrieved cores are polycystine radiolarians, which are siliceous microorganisms that inhabit shallow, intermediate and deep waters (e.g., Renz, 1976;Anderson, 1983;Kling, 1979;Kling and Boltovskoy, 1995;Nimmergut and Abelmann, 2002;Okazaki et al, 2004;Suzuki and Not, 2015;Matsuzaki et al, 2016). Their skeletons composed of amorphous silica are generally well-preserved and abundant in the seafloor of the North Pacific, and the high levels of radiolarian preservation and abundance in deep-sea sediments of this region have facilitated numerous paleoceanographic and biostratigraphic studies (e.g., Hays, 1970;Kling, 1973;Foreman, 1975;Morley et al, 1982;Motoyama, 1996;Pisias et al, 1997;Matul et al, 2002;Kamikuri et al, 2004Kamikuri et al, , 2007Matul and Abelmann, 2005;Itaki et al, 2012;Matsuzaki et al, 2014aMatsuzaki et al, -c, 2015aKamikuri, 2017). According to onboard data, radiolarians were very rare in the Pliocene-Miocene sediments collected at Site U1417 (Jaeger et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Their skeletons composed of amorphous silica are generally well-preserved and abundant in the seafloor of the North Pacific, and the high levels of radiolarian preservation and abundance in deep-sea sediments of this region have facilitated numerous paleoceanographic and biostratigraphic studies (e.g., Hays, 1970;Kling, 1973;Foreman, 1975;Morley et al, 1982;Motoyama, 1996;Pisias et al, 1997;Matul et al, 2002;Kamikuri et al, 2004Kamikuri et al, , 2007Matul and Abelmann, 2005;Itaki et al, 2012;Matsuzaki et al, 2014aMatsuzaki et al, -c, 2015aKamikuri, 2017). According to onboard data, radiolarians were very rare in the Pliocene-Miocene sediments collected at Site U1417 (Jaeger et al, 2014). Of the few radiPublished by Copernicus Publications on behalf of The Micropalaeontological Society.…”

Section: Introductionmentioning

confidence: 99%

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Quaternary radiolarian biostratigraphy in the subarctic northeastern Pacific (IODP Expedition 341 Site U1417) and synchroneity of bioevents across the North Pacific

Matsuzaki

Suzuki

2018

J. Micropalaeontol.

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Abstract. Expedition 341 of the Integrated Ocean Drilling Program (IODP) retrieved sediment cores spanning the time interval between the Pleistocene and Miocene from the southern Gulf of Alaska. Onboard Pleistocene radiolarian biostratigraphy is hereby refined by increasing the sampling resolution. The 178 core samples from the upper 190 m CCSF-B (Composite Core Depth Scale F-B) of Site U1417 contained faunal elements similar to the northwestern Pacific; for example, the three biozones in the northwestern Pacific (i.e., Eucyrtidium matuyamai, Stylatractus universus and Botryostrobus aquilonaris) were also recognized in the Gulf of Alaska, spanning 1.80-1.13 Ma, 1.13-0.45 Ma, and the last 0.45 Myr, respectively. Based on the age model that we used in this study and the shipboard paleomagnetic reversal events, the first occurrences (FOs) of Amphimelissa setosa and Schizodiscus japonicus in the northeastern Pacific were preliminarily determined to be 1.48 and 1.30 Ma, respectively. The last occurrence (LO) of Eucyrtidium matuyamai and the FO of Lychnocanoma sakaii, both well-established bioevents in the northwestern Pacific, were dated at 0.80 and 1.13 Ma, respectively. The LO of E. matuyamai is a synchronous event at 1.05 ± 0.1 Ma in the North Pacific, while the FOs of A. setosa and S. japonicus at 1.48 and 1.30 Ma, respectively, are significantly older than what has been found elsewhere.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Quaternary radiolarian biostratigraphy in the subarctic northeastern Pacific (IODP Expedition 341 Site U1417) and synchroneity of bioevents across the North Pacific

Matsuzaki

Suzuki

2018

J. Micropalaeontol.

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The impact of rapid sediment accumulation on pore pressure development and dehydration reactions during shallow subduction in the Gulf of Alaska

Meridth

Screaton

Jaeger

et al. 2017

Geochem Geophys Geosyst

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In the Gulf of Alaska region, sediment has rapidly accumulated (>1 km/my) in the trench sourced from intensified glaciation in the past $1.2 million years. This rapid sediment accumulation increases overburden and should accelerate dehydration of hydrous minerals by insulating the underlying sediment column. These processes have the potential to generate fluid overpressures in the low permeability sediments entering the subduction zone. A 1-D model was developed to simulate dehydration reaction progress and investigate excess pore pressures as sediments approach the trench and are subducted. At the deformation front, simulated temperatures increase by $308C due to the insulating effect of trench sediments. As a result, opal-A begins to react to form quartz while smectite remains mostly unreacted. Loading due to the trench sediments elevates excess pore pressures to $30% of lithostatic pressure at the deformation front; however, deformation front excess pore pressures are sensitive to assumptions about the permeability of outer wedge sediments. If the outer wedge sediments are coarse-grained and high-permeability rather than mud-dominated, excess pore pressures are lower but still have an insulating effect. During early subduction, simulated pore pressures continue to rise and reach $70% of lithostatic by 60 km landward. The 1-D modeling results suggest that the elevated pore pressures are primarily due to loading and that dehydration reactions are not a significant component of excess pore pressure generation at this margin.

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Release of mineral-bound water prior to subduction tied to shallow seismogenic slip off Sumatra

Hüpers

Torres

Owari

et al. 2017

Science

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International audienceTrying to understand where major earthquakes and tsunamis might occur requires analysis of the sediments pouring into a subduction zone. Thick sediments were expected to limit earthquake and tsunami size in the Sumatran megathrust event in 2004, but the magnitude 9.2 earthquake defied expectations. Hüpers et al. analyzed sediments recovered from the Sumatran megathrust. They found evidence of sediment dehydration, which increased fault strength and allowed for the much larger earthquake to occur. Thus, models of other subduction zones, such as the Gulf of Alaska, may underestimate the maximum earthquake magnitude and tsunami risk

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Cited by 6 publications

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Quaternary radiolarian biostratigraphy in the subarctic northeastern Pacific (IODP Expedition 341 Site U1417) and synchroneity of bioevents across the North Pacific

Quaternary radiolarian biostratigraphy in the subarctic northeastern Pacific (IODP Expedition 341 Site U1417) and synchroneity of bioevents across the North Pacific

The impact of rapid sediment accumulation on pore pressure development and dehydration reactions during shallow subduction in the Gulf of Alaska

Release of mineral-bound water prior to subduction tied to shallow seismogenic slip off Sumatra

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