Site U1418

Jaeger, J.M.; Gulick, S.P.S.; LeVay, L.J.; Asahi, Hirofumi; Bahlburg, Heinrich; Belanger, C.L.; Berbel, G.B.B.; Childress, L.B.; Cowan, E.A.; Drab, L.; Forwick, Matthias; Fukumura, Akemi; Ge, Shulan; Gupta, Sandeep K.; Kioka, Arata; Konno, Susumu; März, Christian; Matsuzaki, Kenji M.; McClymont, Erin L.; Mix, Alan C; Moy, Christopher M.; Müller, Juliane; Nakamura, Atsunori; Ojima, Takanori; Ridgway, Kenneth D.; Ribeiro, Flávia Noronha Dutra; Romero, Oscar E; Slagle, Angela L.; Stoner, J. S.; St‐Onge, Guillaume; Suto, Itsuki; Walczak, Maureen H.; Worthington, L. L.

doi:10.2204/iodp.proc.341.104.2014

Cited by 3 publications

(5 citation statements)

References 62 publications

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“…A total of six holes were cored at Site U1418, ranging in depth from 17.0 to 948.7 meters below seafloor (mbsf). The cores recovered a sequence of Late Pleistocene-Holocene (0-1.2 Ma) mud with interbedded silt, mud with interbedded clast-poor diamict, mud, and muddy diamict (Jaeger et al, 2014b). Several micro- fossil groups were present at this site, including planktonic and benthic foraminifers, diatoms, radiolarians, and calcareous nannofossils (Jaeger et al, 2014b).…”

Section: Introductionmentioning

confidence: 85%

“…The shipboard age model suggests the studied section spans the recent to ~200 ka (Jaeger et al, 2014b), during which time there are no nannofossil zonal markers (Gradstein et al, 2012). The datum Gephyrocapsa caribbeanica/Emiliania huxleyi crossover (0.09 Ma) was not observed because G. caribbeanica was not present at this site.…”

Section: Calcareous Nannofossilsmentioning

confidence: 91%

“…Several micro- fossil groups were present at this site, including planktonic and benthic foraminifers, diatoms, radiolarians, and calcareous nannofossils (Jaeger et al, 2014b). Calcareous nannofossils were identified intermittently in the uppermost ~266 m core composite depth below seafloor (CCSF-A) and less frequently from 266 to 600 m CCSF-A (Jaeger et al, 2014b).…”

Section: Introductionmentioning

confidence: 91%

“…A total of 131 samples were studied for calcareous nannofossils from the Site U1418 shipboard splice, which includes material from Holes U1418A, U1418C, U1418D, and U1418E (Jaeger et al, 2014b). Samples were prepared using a standard smear slide technique and examined using a Zeiss Axioskop microscope at 1000× magnification.…”

Section: Calcareous Nannofossilsmentioning

confidence: 99%

“…The cores recovered a sequence of Late Pleistocene-Holocene (0-1.2 Ma) mud with interbedded silt, mud with interbedded clast-poor diamict, mud, and muddy diamict (Jaeger et al, 2014b). Several micro- fossil groups were present at this site, including planktonic and benthic foraminifers, diatoms, radiolarians, and calcareous nannofossils (Jaeger et al, 2014b). Calcareous nannofossils were identified intermittently in the uppermost ~266 m core composite depth below seafloor (CCSF-A) and less frequently from 266 to 600 m CCSF-A (Jaeger et al, 2014b).…”

Section: Introductionmentioning

confidence: 99%

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Data report: calcareous nannofossils and bulk calcium carbonate measurements from IODP Expedition 341, Site U1418, Gulf of Alaska

Braha¹,

Hager-Hahn²,

LeVay³

2019

Proceedings of the IODP

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Site U1418 was cored on the Surveyor Fan in the Gulf of Alaska during Integrated Ocean Drilling Program (IODP) Expedition 341. A 949 m sedimentary sequence consisting of muds and diamicts was recovered. The uppermost ~266 m contained rare intermittent occurrences of calcareous nannofossils. This interval spans approximately the last 200 ky and potentially records environmental changes associated with glacial-interglacial cycles, making it useful for paleoceanographic reconstructions. In an effort to determine calcareous nannofossil productivity through this time interval, we studied the nannofossil assemblage and calcium carbonate (CaCO 3) weight percentage of the sediments. The nannofossil assemblage was dominated by Gephyrocapsa species and Coccolithus pelagicus. Gephyrocapsa spp. were most abundant between ~100 and 266 m core composite depth below seafloor (CCSF-A). Shallower than 100 m, C. pelagicus composed at least half of the assemblage. Reworked specimens of Eocene-Oligocene age were consistently observed. CaCO 3 content averaged 2.77 wt% and did not display any notable trends across the study interval.

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Section: Introductionmentioning

confidence: 85%

Section: Calcareous Nannofossilsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 91%

Section: Calcareous Nannofossilsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Data report: calcareous nannofossils and bulk calcium carbonate measurements from IODP Expedition 341, Site U1418, Gulf of Alaska

Braha¹,

Hager-Hahn²,

LeVay³

2019

Proceedings of the IODP

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Effect of Seismicity and Tectonic‐Glacial Interactions on Submarine Megaslides

Gulick,

Reece,

Sawyer

et al. 2024

Geophysical Research Letters

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Enhanced sedimentation at glacial margins can produce submarine megaslides (>10,000 km3). We report a single megaslide in the Surveyor Fan, Gulf of Alaska. Minimum extant size is ∼16,124 km2 in area and ∼9,080 km3 in volume. Slope failure occurred ∼1.2 Ma at the onset of the mid‐Pleistocene transition (MPT). With accretion along the Aleutian‐Alaska Trench, the original volume is conservatively ∼16,280 km3, with only a 140 km run‐out due to its blocky, high shear strength nature. We suggest the megaslide was triggered by a major sediment influx at the onset of the MPT, when glacial‐interglacial cycles shifted from 41 to 100 Kyr. The absence of repeat megaslides may reflect a changing balance between seismic strengthening and sediment flux, where later sedimentation driven by cross‐shelf ice streams results in thin, fluidized, non‐cohesive slides. Continued accretion of the Surveyor Fan and megaslide also reduces critical wedge taper, further inhibiting major failure.

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