Publication Date:
2024-01-09
Description:
The distribution of Holocene benthic foraminifer species in bottom sediments in the Izu-Bonin Arc region of the northwestern Pacific Ocean has been investigated on the basis of 23 samples recovered from depths between 1100 and 4100 m. The benthic foraminifer faunas identified can be grouped into four species assemblages corresponding to four bathymetric zones: the abyssal zone (below 3700 m water depth), lower bathyal zone (2600-3600 m), lower middle bathyal zone (1600-2300 m), and upper middle bathyal zone (above 1300 m). The dominance of such an agglutinated foraminifer as Rhabdamminella sp. characterizes the abyssal zone, whereas assemblages devoid of calcareous foraminifers distinguish the zone deeper than the carbonate compensation depth (CCD). The occurrence of Bulimina aculeata d'Orbigny enables the recognition of the following three bathymetric zones: the lower bathyal zone characterized by such deep-sea species as Oculosiphon sp., Saccorhiza ramosa (Brady), Alabamina sp., and Pullenia bulloides (d'Orbigny); the lower middle bathyal zone defined by the occurrence of B. aculeata; and the upper middle bathyal zone characterized by the lack of B. aculeata as well as the dominance of such species as Uvigerina proboscidea Schwager and Sphaeroidina bulloides d'Orbigny.
To estimate Quaternary and Pliocene paleobathymetry in the Izu-Bonin region, three water-depth indexes will work well: 3700 m for the CCD, 2300 m for the deepest habitat of B. aculeata, and 1600 m for the shallowest habitat of B. aculeata.
Keywords:
126-790A; 126-792B; Alabamina sp.; Ammobaculites sp.; Ammodiscus sp.; Astrononion pusillum; Bathysiphon filiformis; Bolivina pacifica; Bolivina pusilla; Bolivina robusta; Bulimina aculeata; Bulimina striata; Ceratobulimina pacifica; Chilostomella oolina; Chilostomella ovoidea; Cibicidoides havanensis; Cibicidoides mundulus; Cibicidoides robertsonianus; Cibicidoides sp.; Cibicidoides spp.; Cibicidoides wuellerstorfi; Comment; Counting 〉250 µm fraction; Cribrostomoides sp.; Cyclammina cancellata; Cyclammina cf. trullisata; Cystammina pauciloculata; Dentalina communis; DEPTH, sediment/rock; Discammina sp.; DRILL; Drilling/drill rig; Eggerella bradyi; Ehrenbergina pacifica; Elevation of event; Epistominella exigua; Epistominella sp.; Event label; Favocassidulina favus; Fissurina formosa; Fissurina sp.; Fissurina spp.; Foraminifera, planktic abundance; Foraminifera, planktic preservation; Globobulimina pacifica; Globocassidulina depressa; Globocassidulina moluccensis; Globocassidulina subglobosa; Gyroidina sp.; Gyroidinoides neosoldanii; Gyroidinoides sp.; Gyroidinoides spp.; H208; Haplophragmoides sp.; Hoeglundina elegans; Hormosinella distans; Joides Resolution; Karrerulina apicularis; Lagena laevis; Lagena spp.; Latitude of event; Leg126; Longitude of event; Marginulina sp.; Martinottiella communis; Martinottiella hosoyaensis; Melonis barleeanus; Melonis pompilioides; Melonis sp.; Neouvigerina ampullacea; Nodulina sp.; North Pacific Ocean; Northwest Pacific; Ocean Drilling Program; Oculosiphon sp.; ODP; Oridorsalis umbonatus; Paracassidulina nipponensis; Paracassidulina oshimai; Paracassidulina sagamiensis; Parafissurina sp.; Philippine Sea; Pullenia bulloides; Pullenia quinqueloba; Pullenia sp.; Pyrgo murrhina; Quinqueloculina lamarckiana; RC211; RC292; RC299; RC304; RC306; RC307; RC308; RC319; RC322; RC324; RC332; RC334; RC339; RC344; RC430; RC431; RC434; RC442; RC443; RC459; Recurvoides sp.; Reophax dentaliniformis; Reophax guttifer; Reophax scorpiurus; Reophax spiculifer; Rhabdaminella sp.; Rhabdammina sp.; Rhizammina sp.; Saccammina sphaerica; Saccorhiza ramosa; Sigmoilopsis schlumbergeri; Sphaeroidina bulloides; Sphaeroidina sp.; TC; Textularia sp.; Thalmannammina sp.; Trifarina bradyi; Trigger corer; Trochammina sp.; Trochammina spp.; Uvigerina hispida; Uvigerina hispidocostata
Type:
Dataset
Format:
text/tab-separated-values, 2299 data points
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