Site U1498

Fryer, Patricia; Wheat, C. G.; Williams, T.; Albers, Elmar; Bekins, Barbara A.; Debret, Baptiste; Deng, Jianghong; Dong, Yanhui; Eickenbusch, P.; Frery, Emanuelle; Ichiyama, Yuji; Johnson, K. T. M.; Johnston, R.M.; Kevorkian, R.T.; Kurz, Walter; Magalhães, Vítor; Mantovanelli, S.S.; Menapace, W.; Menzies, C.D.; Michibayashi, K.; Moyer, Craig L.; Mullane, K.K.; Park, J.-W.; Price, Roy E.; Ryan, Jeffrey G.; Shervais, John W.; Sissmann, Olivier; Suzuki, Shino; Takai, Ken; Walter, B.; Zhang, R.

doi:10.14379/iodp.proc.366.109.2018

Cited by 3 publications

(5 citation statements)

References 14 publications

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“…The Fantangisña seamount is situated between 2018.22 and 3496.21 mbsl (Fryer et al, 2018b). Therefore, we maintain that the seamount is too deep to directly influence the ecological requirements and distribution of the planktonic foraminiferal assemblages at the investigated site.…”

Section: Discussionmentioning

confidence: 99%

“…Site U1498 Hole A (3496.21 m water depth) was cored on the most stable southwestern flank of Fantangisña seamount (Fryer et al, 2018a; see Figure 1c). The lithological and biostratigraphic data are from Fryer et al (2018b) and Del Gaudio et al (2022). The stratigraphic sequence at Site U1498A shows pronounced variability in lithology (Figure 3) and is of Late Miocene (Messinian) to Quaternary age.…”

Section: Methodsmentioning

confidence: 99%

“…Lithology at Site U1498A (modified from Fryer et al, 2018b). The white bars represent intervals of core non‐recovery.…”

Section: Methodsmentioning

confidence: 99%

“…Fantangisña represents a large serpentinite mud volcano (20 km diameter, 1600 m height) (Oakley, 2007; Menapace et al, 2019) located at 16°32.25′N, 147°13.25′E (Fryer et al, 2018b). It formed on an uplifted forearc block with a northwest inclination (Fryer et al, 2018b) and is situated on the Mariana forearc, 62 km west of the Mariana Trench (Wheat et al, 2020; Fryer et al, 2018b). At the top of the edifice, normal faulting induced the formation of a 5 km long, 3.5 km wide, U‐shaped depression (Oakley, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Two sites, U1498 and U1497, were drilled on the flank and at the top of the seamount, respectively (Fryer et al, 2018a; Figure 1c). For Site U1498, Holes A and B were drilled (Fryer et al, 2018b), and 181.6 m (11.34% recovery) and 260 m (31.85% recovery) were cored, respectively. We focused our planktonic and benthic foraminifera analyses on Site U1498 Hole A as it recovered the most complete stratigraphic succession among all sites.…”

Section: Introductionmentioning

confidence: 99%

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Foraminifera assemblages from Fantangisña serpentinite mud seamount in the NW Pacific Ocean during the Pleistocene (IODP Expedition 366)

Gaudio

Piller

Auer

et al. 2023

J Quaternary Science

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The Mariana forearc system, in the northwestern Pacific, is known as the only convergent margin setting with currently active serpentine mud volcanism. The Fantangisña serpentinite mud volcano lies 62 km west of the Mariana trench, within the influence of the North Equatorial Current (NEC). Cores recovered by International Ocean Discovery Program (IODP) Expedition 366 contain pelagic sediments overlying layered serpentinite mud deposits. At the bottom of the sequence, nannofossil‐rich forearc deposits were recovered from under the seamount edifice. In this study, we investigated 47 samples from Site U1498A on the southern flank of the seamount for benthic and planktonic foraminifera assemblages. Statistical analyses on planktonic assemblages differentiated two sample groups related to the ratio between thermocline/mixed layer taxa, which indicate fluctuations in the depth of the thermocline (DOT) during the Pleistocene. Variations in the DOT reflect changes in the intensity of the NEC associated with El Niño/La Niña conditions. Mudflows do not influence the ecology of planktonic foraminifera but possibly enhance their preservation against dissolution, which was instead detected in the pelagic deposit as suggested by common Globigerinoides conglobatus. Benthic foraminifers were rare in serpentinite mud deposits as they are severely affected by mudflows. Conversely, they showed high diversity pre‐/post‐mud‐volcanism, and indicate oligotrophic bottom‐water conditions.

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Section: Discussionmentioning

confidence: 99%