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Ravelo, C.; Takahashi, Kozo; Zarikian, C.A. Alvarez; Guérin, Gilles; Liu, Tanzhuo; Aiello, Ivano; Asahi, Hirofumi; Bartoli, Gretta; Caissie, Beth; Chen, Mu‐Hong; Colmenero-Hidalgo, Elena; Cook, M. S.; Dadd, K.A.; Huh, Youngsook; Husum, Katrine; Ijiri, Akira; Ikehara, Masaaki; Kender, Sev; LaVigne, Douglas; Lund, Steve P.; März, Christian; Mix, Alan C; Ojha, Maheswar; Okada, Makoto; Okazaki, Yusuke; Onodera, Jonaotaro; Cartigny, Pierre; Radi, Taoufik; Risgaard-Petersen, Nils; Sakamoto, Tatsuhiko; Scholl, David W.; Schrum, H. N.; Stroynowski, Zuzanna N; Walsh, Emily; Wehrmann, Laura Mariana

doi:10.2204/iodp.pr.323.2010

Cited by 12 publications

(4 citation statements)

References 78 publications

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“…All samples were screened using a Zeiss Axiovert 40 C inverted microscope (Morley et al, 2004) using 20 quadrants on a 100 µm × 100 µm grid graticule, to ascertain the relative proportions (area ratio) of diatom and sponge spicule (Supplement Table S1). Relative biovolumes were calculated following Hillebrand et al (1999) for 16 samples, with the median biovolume for sponges and diatoms in each sample multiplied by their relative proportion. Ten randomly selected samples were checked for purity using scanning electron microscope (SEM) images and X-ray fluorescence (XRF) analysis (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…The use of oxygen isotopes in palaeoenvironmental research is well documented for both lacustrine and marine environments, predominantly from carbonate fossils, but more recently from siliceous microfossils (Emiliani, 1955;Duplessy et al, 1988;Leng and Marshall, 2004;Lisiecki and Raymo, 2007). Of the latter, diatoms (unicellular algae with a siliceous skeleton; class Bacillariophyceae) are most widely used for oxygen isotope analysis with numerous studies showing how changes in the oxygen isotope ratio of diatom silica (δ 18 O diatom ) reflect changes in temperature and the δ 18 O of ambient water (δ 18 O water ) (Shemesh et al, 1992;Swann and Leng, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Pliocene diatom and sponge spicule oxygen isotope ratios from the Bering Sea: isotopic offsets and future directions

et al. 2014

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Abstract. Oxygen isotope analyses of different size fractions of Pliocene diatoms (δ 18 O diatom ) from the Bering Sea show no evidence of an isotope offset and support the use of bulk diatom species samples for palaeoceanographic reconstructions. Additional samples containing concentrations of sponge spicules produce δ 18 O values several per mille (‰) lower than δ 18 O diatom with a calculated mean offset of 3.9‰ ± 1.5. This difference is significantly greater than modern-day variations in water δ 18 O through the regional water column. Despite the potential for oxygen isotope disequilibrium within δ 18 O sponge , there appears to be some similarity between δ 18 O sponge and a global stacked benthic δ 18 O foram record. This highlights the potential for δ 18 O sponge in palaeoenvironmental research at sites where carbonates are not readily preserved.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pliocene diatom and sponge spicule oxygen isotope ratios from the Bering Sea: isotopic offsets and future directions

et al. 2014

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“…1). The surface water above this core site is covered by Bering Sea Slope Current and therefore an area of high productivity called the green belt [10] .…”

Section: Methodsmentioning

confidence: 99%

Geomagnetic Intensity and Direction for the Last 14 ka Recorded in the Core from the Bering Sea

Shi

Huang

et al. 2013

Chinese J of Geophysics

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Paleomagnetic and rock magnetic studies were conducted on the cores from the borehole B5‐4 in a continental slope of the Bering Sea to determine intensity and direction of the geomagnetic field. The results show that the magnetic properties are uniform except the finer magnetic grain size on the upper 0∼0.44 m. The relative paleointensity in the core is highly consistent with that of ODP983. According to the correlation between relative paleointensity in the borehole B5‐4 and ODP983 and an AMS 14C dating of foraminifera at 4.54∼4.56 m, three correlation points can be further determined, thus an age model for the borehole B5‐4 was obtained. The declination and inclination in B5‐4 agree highly with that of high latitude regions, such as the Lake Baikal, North America and Europe and the spherical harmonic model of local geomagnetic field, which provide additional tie points for the age model and a nearly linear sedimentation for the last 14 ka was revealed. The inclination correlation between B5‐4 and two cores from the China East Sea suggests the two discrete sections of shallow inclinations in B5‐4 are likely record of the Gothenburg event, but affected by the early diagenesis or smoothing effect. The above results prove that both relative paleointensity and direction can be obtained in appropriate sediments of the Bering Sea that serve as a time marker. This is very helpful in paleoenvironmental and paleoceanographic study in the Arctic and subarctic areas considering the awful scarcity of age information due to the shortage of calcareous tests and shells.

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Section: Introductionmentioning

confidence: 99%

Pliocene diatom and sponge spicule oxygen isotope ratios from the Bering Sea: isotopic offsets and future directions

Snelling¹,

Swann²,

Pike³

et al. 2014

Preprint

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Abstract. Oxygen isotope analyses of different size fractions of Pliocene diatoms (δ18Odiatom) from the Bering Sea show no evidence of an isotope offset and support the use of bulk diatom species samples for palaeoceanographic reconstructions. Additional samples containing concentrations of sponge spicules produce δ18O values several per mille lower than δ18Odiatom with a calculated mean offset of 3.6‰ ± 0.7. This difference is significantly greater than modern day variations in water δ18O through the regional water column. Despite the potential for oxygen isotope disequilibrium within δ18Osponge, there appears to be some similarity between δ18Osponge and a global stacked benthic δ18Oforam record. This highlights the potential for δ18Osponge in palaeoenvironmental research at sites where carbonates are not readily preserved.

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Cited by 12 publications

References 78 publications

Pliocene diatom and sponge spicule oxygen isotope ratios from the Bering Sea: isotopic offsets and future directions

Pliocene diatom and sponge spicule oxygen isotope ratios from the Bering Sea: isotopic offsets and future directions

Geomagnetic Intensity and Direction for the Last 14 ka Recorded in the Core from the Bering Sea

Pliocene diatom and sponge spicule oxygen isotope ratios from the Bering Sea: isotopic offsets and future directions

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