Holocene reef-growth dynamics on Kodakara Island (29°N, 129°E) in the Northwest Pacific

Hamanaka, Nozomu; Kan, Haidong; Nakashima, Yasuhiro; Yokoyama, Yūsuke; Okamoto, Takehiro; Ohashi, Tomoya; Adachi, Hiroshi; Matsuzaki, Hiroyuki; Hori, Nobuyuki

doi:10.1016/j.geomorph.2015.04.011

Cited by 7 publications

(4 citation statements)

References 54 publications

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“…We hypothesize that the reversal in dominant monsoon wind direction favored the transport of rim-derived sediments into the lagoon, thus completing the infill, and soon thereafter initiating island formation. Our observations are therefore consistent with other studies of reef evolution that have described the profound impact of a changing climate in the mid-Holocene 36 , 37 . In addition, other climate effects may have contributed to the observed sea-level variations.…”

Section: Mid-holocene Hiatussupporting

confidence: 92%

Fluctuating sea-level and reversing Monsoon winds drive Holocene lagoon infill in Southeast Asia

Kappelmann

Westphal

Kneer

et al. 2023

Sci Rep

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Many lagoons surrounded by reefs are partially or completely infilled with reef-derived detrital carbonate sediment. Sediment deposits in such restricted environments are archives of prevailing environmental conditions during lagoon infill. For Indonesia, no paleoenvironmental reconstructions based on Holocene lagoon sediments exist. Here we analyze the sedimentary record obtained from five percussion cores penetrating 10 m into the unconsolidated subsurface of a reef island in the Spermonde Archipelago, Indonesia. The combined compositional, textural and chronostratigraphic analyses reveal that the sedimentary infill of the lagoon underlying the island, starting 6900 years cal BP, was interrupted between 5800 and 4400 years cal BP, when sea level was ~ 0.5 m higher than at present, and monsoon intensity was lower. After the intensity of the monsoons increased to modern levels, and sea level dropped to its present position, lagoonal sedimentation was re-initiated and created the foundation for an island that built up since 3000 years cal BP. Our study provides the first geological evidence for the strong sensitivity of detrital carbonate systems in Indonesia to fluctuations in sea level and dominant wind direction. It thus sheds light on how changing environmental conditions in the context of global warming could affect the morphological development of reef systems, and thereby also habitable coastal areas.

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Section: Mid-holocene Hiatussupporting

confidence: 92%

Fluctuating sea-level and reversing Monsoon winds drive Holocene lagoon infill in Southeast Asia

Kappelmann

Westphal

Kneer

et al. 2023

Sci Rep

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“…In addition, descriptions are frequently qualitative and adjective-based rather than quantitative (Duce and Janowicz, 2010). For example, adjectives such as -narrow‖ are used in place of quantitative values to describe groove width (Roberts 1974;Blanchon and Jones, 1997;Hamanaka et al, 2015).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

A morphometric assessment and classification of coral reef spur and groove morphology

et al. 2016

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S0169-555X (16) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.  Four classes of spurs and grooves are formally defined using remote sensing for global application. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT Classes correspond to different formation mechanisms with implications for reef platform evolution. Waves are key drivers of feature morphology but width and slope of the fore reef are important. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPTConfidential manuscript submitted to Geomorphology AbstractSpurs and grooves (SaGs) are a common and important feature of coral reef fore slopes worldwide. However, they are difficult to access and hence their morphodynamics and formation are poorly understood. We use remote sensing, with extensive ground truthing, to measure SaG mophometrics and environmental factors at 11,430 grooves across 17 reefs in the southern Great Barrier Reef, Australia. We revealed strong positive correlations between groove length, orientation and wave exposure with longer, more closely-spaced grooves oriented easterly reflecting the dominant swell regime. Wave exposure was found to be the most important factor controlling SaG distribution and morphology. Gradient of the upper reef slope was also an important limiting factor, with SaGs less likely to develop in steeply sloping (>5°) areas. We used a subset of the morphometric data (11 reefs) to statistically define four classes of SaG. This classification scheme was tested on the remaining six reefs.SaGs in the four classes differ in morphology, groove substrate and coral cover. These differences provide insights into SaG formation mechanisms with implications to reef platform growth and evolution. We hypothesize SaG formation is dominated by coral growth processes at two classes and erosion processes at one class. A fourth class may represent relic features formed earlier in the Holocene transgression. The classes are comparable with SaGs elsewhere, suggesting the classification could be applied globally with the addition of new classes if necessary. While further research is required, we show remotely sensed SaG morphometrics can provide useful insights into reef platform evolution.

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“…2). The first three ash layers are sourced from Hokkaido volcanoes, specifically from Toya Caldera (Machida et al, 1987) for the former and from the Kutcharo Volcano for the latter two (Hasegawa et al, 2012).…”

Section: Hokkaidomentioning

confidence: 99%

“…As such, sea-level change since the Last Glacial Maximum in Japan is well characterized both overall and by region (Umitsu, 1991). Unlike MIS 5e sea-level proxies, 14 C dating has been utilized as a numerical age dating method on sea-level proxies rather than designating ages to a chronohorizon and sees much use on coral reefs that emerged during the Holocene (e.g., Maemoku, 1992;Hamanaka et al, 2015;Hongo and Kayanne, 2011) and on molluscs (e.g., Yokoyama et al, 2016) in the Ryukyu Islands. Largely, the same methods for examining MIS 5e sea-level proxies are also utilized, such as tephrochronology, stratigraphic correlation, and seismic crustal analysis (e.g., Moriwaki, 2006;Nagaoka et al, 2010;Shishikura et al, 2008).…”

Section: Holocene Sea-level Indicatorsmentioning

confidence: 99%

A review of MIS 5e sea-level proxies around Japan

Tam

Yokoyama

2021

Earth Syst. Sci. Data

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Abstract. Sea-level proxies for Marine Isotopic Stage 5e (MIS 5e, ca. 124 ka) are abundant along the Japanese shoreline and have been documented for over at least the past 60 years. The bulk of these sea-level proxies are identified in Japan as marine terraces, often correlated by stratigraphic relationships to identified tephra layers, or other chronologically interpreted strata. Use of stratigraphic correlation in conjunction with other techniques such as paleontological analysis, tectonic uplift rates, tephra (volcanic ash), uranium–thorium (U–Th), and carbon-14 (14C) dating have connected Japan's landforms to global patterns of sea-level change. This paper reviews over 60 years of publications containing sea-level proxies correlated with MIS 5e in Japan. Data collected for this review have been added to the World Atlas of Last Interglacial Shorelines (WALIS), following their standardizations on the elements necessary to analyze paleosea-levels. This paper reviewed over 70 studies, assembling data points for over 300 locations and examining related papers denoting sea-level indicators for MIS 5e. The database compiled for this review (Tam and Yokoyama, 2020) is available at https://doi.org/10.5281/zenodo.4294326. Sea-level proxy studies in Japan rely heavily on chronostratigraphic techniques and are recognized as reliable, though opportunities exist for further constraining through the further use of numerical age dating techniques.

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Holocene reef-growth dynamics on Kodakara Island (29°N, 129°E) in the Northwest Pacific

Cited by 7 publications

References 54 publications

Fluctuating sea-level and reversing Monsoon winds drive Holocene lagoon infill in Southeast Asia

Fluctuating sea-level and reversing Monsoon winds drive Holocene lagoon infill in Southeast Asia

A morphometric assessment and classification of coral reef spur and groove morphology

A review of MIS 5e sea-level proxies around Japan

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