Stratigraphy of reef deposits on Kita-daito-jima, Japan

Nambu, Akio; Inagaki, S.; Ozawa, Shinsuke; Suzuki, Yuka; Iryu, Yasufumi

doi:10.5575/geosoc.109.617

Cited by 6 publications

(12 citation statements)

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“…The time required for the soil formation process can be estimated as at least 100 to 200 ka. The reason for this estimate, as given by Nambu et al (2003), is the lowering of seawater in a cooler period of climatic change. These soil layers can be observed along the northwest coast of Minamidaito Island.…”

Section: Karstification Processes On Minamidaito Islandmentioning

confidence: 97%

“…was dated at 2 Ma. Reexamining the samples obtained by Sugiyama in 1934 and1936, other researchers reported that the ages of the dolomite on Kitadaito could be classified into several layers in detail (Inagaki & Iryu 1998;Nambu et al 2003;Suzuki et al 2006;Hideo et al 2010). Their conclusions can be summarized as follows: (1) Minamidaito is not an uplifted atoll, (2) the present terrain is a result of karstification, and (3) the upper part of the bedrock above −100 meters was dolomitized on Kitadaito Island.…”

Section: Kaigunbomentioning

confidence: 98%

“…Part of coral limestone was dolomitized in seawater (Nambu et al 2003). There is a surface of unconformity between older and younger dolomite beds.…”

Section: Kaigunbomentioning

confidence: 99%

“…There is a surface of unconformity between older and younger dolomite beds. The older is about 4.9 Ma while that younger is about 2.1 Ma old (Nambu et al 2003). Suzuki et al (2006) reported that dolomite is also in the upper part (dated from 5.5 to 1.6 Ma).…”

Section: Kaigunbomentioning

confidence: 99%

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Lithology, Rock Relief and Karstification of Minamidaito Island (Japan)

Knez¹,

Slabe²,

Urushibara-Yoshino³

2017

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Otok Minamidaito je zakrasel koralni otok na Filipinski plošči. Obdobja zakrasevanja so bila na koncu pliocena, skoraj ves pleistocen in v holocenu. Prvo obdobje zakrasevanja lahko razberemo v spodnjih Daito dolomitiziranih apnencih. Zakrasevanje je posledica spremebe gladine morja zaradi hladnješih paleoklimatskih razmer. Z geološkimi raziskavami smo podrobno preučili grebenske karbonate. Prevladujejo biointra sparitni apnenci tipa framestone in bafflestone s prehodi v grainstone ter dolomitizirani biointra sparitni apnenci tipa framestone in bafflestone. S pomočjo kalcimetričnih analiz smo ugotovili, da je razporeditev apnencev in dolomitov na nekaterih lokacijah drugačna od do sedaj opisane. Skalni relief razkriva svojevrstno oblikovanje obmorskih škrapelj, razvoj površja v notranjosti otoka in najbolj značilna obdobja razvoja jam.

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Section: Karstification Processes On Minamidaito Islandmentioning

confidence: 97%

Section: Kaigunbomentioning

confidence: 98%

“…Part of coral limestone was dolomitized in seawater (Nambu et al 2003). There is a surface of unconformity between older and younger dolomite beds.…”

Section: Kaigunbomentioning

confidence: 99%

Section: Kaigunbomentioning

confidence: 99%

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Lithology, Rock Relief and Karstification of Minamidaito Island (Japan)

Knez¹,

Slabe²,

Urushibara-Yoshino³

2017

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“…Carbonates out cropping on the island comprise two basic stratigraphic units: the Daito and Kaigunbo formations (Nambu et al 2003). Almost all the carbonate rocks on the island surface are pervasively dolomitized (Suzuki et al 2006) and can be assigned to the older Daito Formation.…”

Section: Geologic Settingmentioning

confidence: 99%

Uplift rate of Kitadaito Jima Island on the lithospheric forebulge of the Philippine Sea Plate

Iryu

Takayanagi²,

Ishikawa³

et al. 2023

Prog Earth Planet Sci

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Estimates of uplift rates for lithospheric forebulges are needed to understand exact plate motions at plate convergence zones and to delineate the fate of coral reefs atop the forebulges. A carbonate island on a lithospheric forebulge can provide excellent materials for estimating uplift rate because carbonate sediments can be dated and their paleo-water depth determined. We estimated the uplift rate of Kitadaito Jima Island, a carbonate island on the lithospheric forebulge of the Philippine Sea Plate that is subducting beneath the Eurasian Plate. Marine skeletal sands containing pebble-sized bioclasts and filling the concavity of an intertidal erosional notch at an elevation of ~ 71 m were found near the top of this island. Strontium isotope ages ranging from 1.78 to 2.01 Ma with an average of 1.89 Ma (standard deviation = 0.07 Ma) were obtained from these deposits. As global sea level at 1.89 Ma was ~ 21 m lower than the present, the mean uplift rate was estimated at ~ 49 m/million years (Myr) with a compounded uncertainty of ± 2.6 m/Myr. This rate is comparable to, or up to ~ 140 m/Myr less than, rates reported from other Indo-Pacific carbonate islands in similar tectonic settings. This study illustrates how contemporary Sr isotope age models and careful considerations of limestone sample depositional depths can yield more accurate and precise uplift rates of modern forearc bulges than possible in many older studies.

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