Vertical Changes of Holocene Ostracodes in Bore Hole Cores from off Kobe, Related to the Opening of Straits and Relative Sea-Level Change in Western Japan.

Irizuki, Toshiaki; Masuda, Fujio; Miyahara, Basara; Hirotsu, Atsushi; Ueda, Shizuki

doi:10.4116/jaqua.40.105

Cited by 20 publications

(17 citation statements)

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“…In Osaka Bay and Plain (core OB‐1, W1, W2, and Bor.1), Iyonada (core K1, K2, S1, and S2), and Hiroshima Bay (core HIR94‐3), 190 out of 213 samples are analogous (Figure S6). Irizuki et al (2001) and Yasuhara et al (2004, 2005), and Yasuhara and Seto (2006), who studied ostracode assemblages with a focus on the ecology of dominant taxa and inferred paleo‐water depths, have inferred RSL changes from cores collected in core OB‐1, K1, K2, S1, S2, and HIR94‐3. In core K1 and K2, the results of RSL are concordant with Yasuhara et al (2005), considering the errors.…”

Section: Resultsmentioning

confidence: 99%

“…The water depths in the modern data set ranged from 0.3 to 50 m. We registered the data on the modern ostracode taxa and the locality and water depth of their habitats used for the MAT in the Dryad Digital Repository (https://datadryad.org/stash/share/Caof8eH1lrqg2vUUvuH20N71TqbLAOHBt4g5ydr8W2g). The fossil data set (i.e., the test data) consisted of the ostracode assemblages from core SKM and those from nine other cores from around Shikoku Island (sourced from Irizuki et al, 2001; Yasuhara et al, 2004, 2005; Yasuhara & Seto, 2006).…”

Section: Methodsmentioning

confidence: 99%

“…The well‐preserved microfossils in the core sediments make it possible to infer RSLs at many precisely dated horizons. Furthermore, previous studies have inferred RSLs from diatom and ostracode assemblages in 13 cores collected at various sites on Shikoku Island and in the surrounding region (Irizuki et al, 2001; Sato et al, 2001, 2003; Yasuhara et al, 2004, 2005; Yasuhara & Seto, 2006; Table 1). By correlating RSLs between these sites and core SKM, it should be possible to infer tectonic crustal movements due to the subduction of the Philippine Sea plate during the Holocene.…”

Section: Introductionmentioning

confidence: 99%

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Middle Holocene relative sea‐level changes and vertical tectonic crustal movements on Shikoku Island near the Nankai Trough, Japan

et al. 2022

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The Philippine Sea plate subducts beneath the Eurasia plate at the Nankai Trough, northwestern Pacific, causing crustal deformation, mega‐thrust earthquakes, and tsunami events. Shikoku Island, 150 km northwest of the trough, experiences both coseismic and interseismic deformation. Coastal sediments potentially record vertical crustal movements as relative sea level (RSL) changes. We studied sedimentary facies and microfossil ostracodes in core SKM from southwestern Shikoku Island for evidence of middle Holocene tsunami events and deformation. The core sediments included nine event layers corresponding to storm or tsunami events. Using modern analog techniques, we estimated RSLs from the ostracode assemblages of core SKM and 13 other cores from Shikoku Island and the surrounding region. Then, we subtracted RSL changes due to glacio‐hydro isostatic adjustment from the estimated RSLs to estimate vertical tectonic movement rates in these cores between 8.6 and 4.7 ka. The inferred RSL changes suggest that the Sukumo site has experienced both uplift and subsidence since 8.6 ka. Before 6.6 ka, rates of tectonic crustal movement were higher than the modern‐day rate, and its spatial distribution also differed. After 6.6 ka, tectonic crustal movement showed a similar spatial pattern and occurred at rates close to the modern day interseismic rate. The spatial pattern and rates of tectonic crustal movement could be caused by changes in rupture areas between the Eurasia and the Philippine Sea plates beneath the Shikoku Island and in stress condition of the asthenosphere. Some of the vertical displacements can be explained by the movements of local active faults.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Middle Holocene relative sea‐level changes and vertical tectonic crustal movements on Shikoku Island near the Nankai Trough, Japan

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“…The water depth from that study agrees well with the results of this study. Studies on ostracodes from other areas in Japan (Irizuki et al, 2001;Yasuhara, 2008) have also indicated a rapid increase in water depth at ca. 8000 cal yr BP and a change in ostracode biofacies at this time.…”

Section: Period 8 (8400-7900 Cal Yr Bp)mentioning

confidence: 99%

“…These studies have shown that marginal marine ostracodes were sensitive to Holocene global climatic changes. For western North Pacific coasts, where enclosed or marginal seas such as the East China Sea, Bohai Sea, Yellow Sea, and Sea of Japan exist and many small bays and lagoons have developed along the coastal areas, Holocene climatic changes have been reconstructed based on ostracodes (e.g., Wang and Zhang, 1987;Wang et al, 1988;Zhu and Lin, 1990;Iwasaki, 1992;Cao, 1998;Irizuki et al, 1998Irizuki et al, , 2001Masuda et al, 2002;Yasuhara et al, 2002a, Yasuhara, 2008Tanaka et al, 2012). However, few studies have been conducted on the relationships between ostracodes and the centennial-to millennial-scale climatic changes in these bays.…”

Section: Introductionmentioning

confidence: 99%

Centennial- to millennial-scale change of Holocene shallow marine environments recorded in ostracode fauna, northeast Japan

et al. 2015

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Using the record of shallow-marine ostracode fauna and sediment grain size data from an 865-cm-long piston core obtained from Mutsu Bay, northeast Japan, paleoceanographic changes of the bay were determined at high resolution for the early to middle Holocene. Changes in the relative frequencies of several species showed periodicities of 1300–1800 years similar to Bond cycles. At around 10,300 cal yr BP and again, at 9500–9300 cal yr BP, cold water strongly influenced the bay owing to cooling events. Since at least 10,200 cal yr BP the Tsugaru Warm Current influenced the surface waters, and since ca. 7400 cal yr BP, also the bottom waters of the bay. Since ca. 8400 cal yr BP the water depth rapidly increased and peaked at 7000–5900 cal yr BP due to global sea-level rise. Subsequently, a drop of water temperature and sea level in the bay at 5900 and around 4000 cal yr BP influenced the composition of the ostracode assemblages. These millennial-scale oscillations in relative sea level and bay temperature during the Holocene can be correlated to paleoclimate records elsewhere.

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Ostracods and sea level

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2015

Handbook of Sea‐Level Research

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Vertical Changes of Holocene Ostracodes in Bore Hole Cores from off Kobe, Related to the Opening of Straits and Relative Sea-Level Change in Western Japan.

Cited by 20 publications

References 8 publications

Middle Holocene relative sea‐level changes and vertical tectonic crustal movements on Shikoku Island near the Nankai Trough, Japan

Middle Holocene relative sea‐level changes and vertical tectonic crustal movements on Shikoku Island near the Nankai Trough, Japan

Centennial- to millennial-scale change of Holocene shallow marine environments recorded in ostracode fauna, northeast Japan

Ostracods and sea level

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