Interstadial coral reef terraces and relative sea-level changes during marine oxygen isotope stages 3–4, Kikai Island, central Ryukyus, Japan

Sasaki, Keiichi; Omura, Akio; Murakami, Kazuo; Sagawa, Natsume; Nakamori, Toru

doi:10.1016/j.quaint.2004.01.006

Cited by 34 publications

(22 citation statements)

References 35 publications

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“…Inconsistency even with the 238 U concentration of 2.9–3.5 p.p.m. of four Plesiastrea corals that grew during the glacial period from 59 to 67 ka at Kikai Island (Sasaki et al . 2004) suggest that diagenetic uranium uptake caused the high U concentration of CR14‐2100.…”

Section: Resultsmentioning

confidence: 99%

²³⁰Th/²³⁴U and ¹⁴C dating of a lowstand coral reef beneath the insular shelf off Irabu Island, Ryukyus, southwestern Japan

Sasaki¹,

Omura

Miwa

et al. 2006

Island Arc

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High-resolution seismic reflection profiles delineated the distribution of moundshaped reflections, which were interpreted as reefs, beneath the insular shelf western off Irabu Island, Ryukyus, southwestern Japan. A sediment core through one of the mounded structures was recovered from the sea floor at a depth of −118.2 m by offshore drilling and was dated by radiometric methods. The lithology and coral fauna of the core indicate that the mounded structure was composed of coral-algal boundstone suggesting a small-scaled coral reef. High-precision α-spectrometric 230 Th/ 234 U dating coupled with calibrated accelerator mass spectrometric 14 C ages of corals obtained reliable ages of this reef ranging from 22.18 ± 0.63 to 30.47 ± 0.98 ka. This proves that such a submerged reef was formed during the lowstand stage of marine oxygen isotope stages 3-2. The existence of low-Mg calcite in the aragonitic coral skeleton of 22.18 ± 0.63 ka provides evidence that the reef had once been exposed by lowering of the relative sealevel to at least −126 m during the last glacial maximum in the study area. There is no room for doubt that a coral reef grew during the last glacial period on the shelf off Irabu Island of Ryukyus in the subtropical region of western Pacific.

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Section: Resultsmentioning

confidence: 99%

²³⁰Th/²³⁴U and ¹⁴C dating of a lowstand coral reef beneath the insular shelf off Irabu Island, Ryukyus, southwestern Japan

Sasaki¹,

Omura

Miwa

et al. 2006

Island Arc

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“…Yet, identifications of MIS 3 paleocoasts often remain ambiguous. Out of all purported MIS 3 sites, highstands remain only from fast uplifting coastlines, as found on the Mahia Peninsula in New Zealand (Berryman, 1992(Berryman, , 1993a, or islands of the Vanuatu archipelago such as Santo Taylor et al, 1980;Jouannic et al, 1982;Taylor et al, 1982Taylor et al, , 1987Galipaud and Pineda, 1998), Malekula (Cabioch and Ayliffe, 2001) and Torres (Taylor et al, 1985), and Kikai island in the Ryukyus archipelago (Konishi et al, 1970;Ikeya and Ohmura, 1983;Ikeda et al, 1991;Ota and Omura, 1992;Sasaki et al, 2004;Maejima et al, 2005;Inagaki and Omura, 2006).…”

Section: Mis 1 and Mismentioning

confidence: 99%

Coastal staircase sequences reflecting sea-level oscillations and tectonic uplift during the Quaternary and Neogene

Pedoja

Husson

Johnson

et al. 2014

Earth-Science Reviews

167

195

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. Many coasts feature sequences of Quaternary and Neogene shorelines that are shaped by a combination of sealevel oscillations and tectonics. We compiled a global synthesis of sea-level changes for the following highstands: MIS 1, MIS 3, MIS 5e and MIS 11. Also, we date the apparent onset of sequences of paleoshorelines either from published data or tentatively extrapolating an age for the uppermost, purported oldest shoreline in each sequence. Including the most documented MIS 5e benchmark, we identify 926 sequences out of which 185 also feature Holocene shorelines. Six areas are identified where elevations of the MIS 3 shorelines are known, and 31 feature elevation data for MIS 11 shorelines. Genetic relationships to regional geodynamics are further explored based on the elevations of the MIS 5e benchmark. Mean apparent uplift rates range from 0.01 ± 0.01 mm/yr (hotspots) to 1.47 ± 0.08 mm/yr (continental collision). Passive margins appear as ubiquitously uplifting, while tectonic segmentation is more important on active margins. From the literature and our extrapolations, we infer ages for the onset of formation for~180 coastal sequences. Sea level fingerprinting on coastal sequences started at least during mid Miocene and locally as early as Eocene. Whether due to the changes in the bulk volume of seawater or to the temporal variations in the shape of ocean basins, estimates of eustasy fail to explain the magnitude of the apparent sea level drop. Thus, vertical ground motion is invoked, and we interpret the longlasting development of those paleoshore sequences as the imprint of glacial cycles on globally uplifted margins in response to continental compression. The geomorphological expression of the sequences matches the amplitude and frequency of glacial cyclicity. From middle Pleistocene to present-day, moderately fast (100,000 yrs) oscillating sea levels favor the development of well identified strandlines that are distinct from one another. Pliocene and Lower Pleistocene strandlines associated with faster cyclicity (40,000 yrs) are more compact and easily merge into rasas, whereas older Cenozoic low-frequency eustatic changes generally led to widespread flat-lying coastal plains.

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“…Sea‐level fluctuations of a similar amplitude occurred during the last glacial cycle, in particular between MIS 5e and 3 (Chappell, ; Chappell et al, ; Cutler et al, ; Potter et al, ; Yokoyama, Esat, & Lambeck, , ). In other islands of the Ryukyus, a suite of uplifted coral reef terraces corresponding to the younger limestone were formed during interglacial (MIS 9, 7, and 5e) and interstadial (MIS 5c, 5a, and 3) sea‐level changes (Nanjo, Sasaki, & Matsuda, ; Omura & Ota, ; Sasaki et al, ).…”

Section: Discussionmentioning

confidence: 99%

Depositional environments of well‐sorted detrital limestone from the Minatogawa Formation in the southern part of Okinawa Island, the Ryukyu Archipelago, Japan

et al. 2018

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Well‐sorted detrital limestone is one of the typical lithofacies of the latest interval of the Pleistocene Ryukyu Group, which is exposed in the Ryukyu Archipelago in southwestern Japan. The depositional environments of the limestone are interpreted to be extremely shallow and to include back‐reef lagoons or moats and subaerial sand dunes. However, detailed micropaleontological analyses have not been performed on this limestone. In this study, the interpretation of the depositional environments and paleo‐water depths was improved by quantitative examination of foraminiferal assemblages for the well‐sorted detrital limestone of the Minatogawa Formation in the southern part of Okinawa Island. Thin sections of limestone collected from the Minatogawa (Horikawa) quarry were subjected to sedimentological and foraminiferal analyses. Comparison with modern foraminiferal distribution within the Ryukyu Archipelago indicates that back‐reef and fore‐reef dwelling foraminifers characterize the fossil assemblages from the well‐sorted detrital limestone (bioclastic grainstone). Three ratios of indicator foraminiferal taxa (ratios of back‐reef to fore‐reef taxa, planktonic foraminifers to Amphistegina lobifera and Amphistegina lessonii, and Calcarina gaudichaudii to other Calcarina species), as well as multivariate analyses suggest that the well‐sorted detrital limestone was deposited in fore‐reef setting shallower than 40 m in water depth. A comparable depth range was reconstructed from the coral assemblage in the associated coral limestone, suggesting that the Minatogawa Formation was deposited in a gently inclined ramp setting with patch reefs and/or fringing reefs. Stratigraphic changes in paleo‐water depth, together with evidence of several unconformities associated with paleosol layers suggest that there were repeated transgressions and regressions, with an amplitude up to several tens of meters, when the Minatogawa Formation was deposited.

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Interstadial coral reef terraces and relative sea-level changes during marine oxygen isotope stages 3–4, Kikai Island, central Ryukyus, Japan

Cited by 34 publications

References 35 publications

²³⁰Th/²³⁴U and ¹⁴C dating of a lowstand coral reef beneath the insular shelf off Irabu Island, Ryukyus, southwestern Japan

²³⁰Th/²³⁴U and ¹⁴C dating of a lowstand coral reef beneath the insular shelf off Irabu Island, Ryukyus, southwestern Japan

Coastal staircase sequences reflecting sea-level oscillations and tectonic uplift during the Quaternary and Neogene

Depositional environments of well‐sorted detrital limestone from the Minatogawa Formation in the southern part of Okinawa Island, the Ryukyu Archipelago, Japan

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Interstadial coral reef terraces and relative sea-level changes during marine oxygen isotope stages 3–4, Kikai Island, central Ryukyus, Japan

Cited by 34 publications

References 35 publications

230Th/234U and 14C dating of a lowstand coral reef beneath the insular shelf off Irabu Island, Ryukyus, southwestern Japan

230Th/234U and 14C dating of a lowstand coral reef beneath the insular shelf off Irabu Island, Ryukyus, southwestern Japan

Coastal staircase sequences reflecting sea-level oscillations and tectonic uplift during the Quaternary and Neogene

Depositional environments of well‐sorted detrital limestone from the Minatogawa Formation in the southern part of Okinawa Island, the Ryukyu Archipelago, Japan

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²³⁰Th/²³⁴U and ¹⁴C dating of a lowstand coral reef beneath the insular shelf off Irabu Island, Ryukyus, southwestern Japan

²³⁰Th/²³⁴U and ¹⁴C dating of a lowstand coral reef beneath the insular shelf off Irabu Island, Ryukyus, southwestern Japan