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  • 1
    Electronic Resource
    Electronic Resource
    Middle Miocene to Pleistocene radiolarian biostratigraphy in the Northwest Pacific Ocean, ODP Leg 186 (2004)
    Melbourne, Australia : Blackwell Science Pty
    The @island arc 13 (2004), S. 0 
    Details
    ISSN: 1440-1738
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Abstract  The Upper Cenozoic sedimentary sequences drilled at Sites 1150 and 1151, Ocean Drilling Program Leg 186, enabled establishment of radiolarian zonation and calibration of the age of bioevents in the forearc area of the northern Japan Islands. The sequences were divided into nine zones from the Pleistocene Botryostrobus aquilonaris Zone to the Upper Miocene Lipmanella redondoensis Zone at Site 1150, and 11 zones from the Pleistocene Stylatractus universus Zone to the Middle Miocene Dendrospyris? sakaii Zone at Site 1151. These zones correlate successfully with the studied sequences of many of deep-sea cores in the Northwest Pacific Ocean and with some sections of onshore Japan. Of 67 important radiolarian bioevents recognized during the study, 29 Pleistocene to Upper Miocene events were directly tied to the geomagnetic polarity time scale through the well-defined paleomagnetic polarity records, and 21 Upper Miocene events were calibrated based on the diatom biostratigraphy. Of these events, 24 geographically widespread events were selected to test synchroneity and usefulness as time-horizons within the mid-to-high latitude of the Northwest Pacific, involving eight other offshore and onshore sections. Examination showed that most of the zonal boundary events are synchronous within the considered region, and that many diachronous events, most of which are eliminated from the zonal scheme, are unreliable events linked to rare and sporadic occurrences of the species. Radiolarian biostratigraphy of the studied cores clearly indicates three major hiatuses in the Middle Pleistocene, Late Miocene and late Middle Miocene. The latter two hiatuses can be correlated to two global oceanic hiatuses, NH6 and NH3, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1738.2003.00421.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Middle Miocene to Pleistocene magneto-biostratigraphy of ODP Sites 1150 and 1151, northwest Pacific: Sedimentation rate and updated regional geological timescale (2004)
    Melbourne, Australia : Blackwell Science Pty
    The @island arc 13 (2004), S. 0 
    Details
    ISSN: 1440-1738
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Abstract  Shipboard and shore-based investigation on siliceous and calcareous microfossil biostratigraphy, magneto-stratigraphy and tephrostratigraphy identified numerous datum events from the sedimentary sequences of Sites 1150 and 1151 drilled on the forearc basin of northern Japan by the Ocean Drilling Program Leg 186. Some 83 datum events were selected to construct new age–depth models for the sites. Based on the reliable magneto-stratigraphy from the Pleistocene to the Upper Miocene, which were correlated to the standard geomagnetic polarity timescale, and on excellent records of diatom and radiolarian biostratigraphy throughout the sequences, the shipboard age model was revised. Major revisions referred to stratigraphic position of the Miocene–Pliocene boundary that has been shifted more than 200 m downward in each sequence. The age–depth relations of the forearc sites represent drastic changes in the sedimentation rate—extremely high (40 cm/k.y. on average) in the Early Pliocene and low (less than 2 cm/k.y. on average) in the Middle Miocene—and several hiatuses exist throughout the sequence. The drastic changes can be related mostly to changes in diatom sedimentation and the tectonics of the Japanese Island Arc. Local ages for some foraminiferal, calcareous nannofossil and radiolarian bioevents are estimated from the age–depth models at each site. These newly calibrated bioevents and biozones as well as established diatom biostratigraphy are incorporated into the updated magneto-biochronologic timescale, which will contribute to an improvement in biochronologic accuracy of Neogene sediments in northern Japan and adjacent areas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1738.2003.00426.x
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  • 3
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    (Table 22) Cleaned splice MS and GRA from Site U1331 on revised CCSF-A (2012)
    PANGAEA
    Details
    Publication Date: 2023-12-14
    Keywords: 320-U1331; COMPCORE; Composite Core; Density; Depth, composite revised; Exp320; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Pacific Equatorial Age Transect I; see reference(s); Susceptibility
    Type: Dataset
    Format: text/tab-separated-values, 28664 data points
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  • 4
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    (Table 23) Cleaned MS and GRA from Site U1332 on revised CCSF-A (2012)
    PANGAEA
    Details
    Publication Date: 2023-12-14
    Keywords: 320-U1332; COMPCORE; Composite Core; Density; Depth, composite revised; Exp320; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Pacific Equatorial Age Transect I; see reference(s); Susceptibility
    Type: Dataset
    Format: text/tab-separated-values, 21808 data points
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  • 5
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    Radiolarian faunal turnover across the Oligocene/Miocene boundary in the equatorial Pacific Ocean (2005)
    PANGAEA
    In:  Supplement to: Kamikuri, Shin-Ichi; Nishi, Hiroshi; Moore, Theodore C; Nigrini, Catherine A; Motoyama, Isao (2005): Radiolarian faunal turnover across the Oligocene/Miocene boundary in the equatorial Pacific Ocean. Marine Micropaleontology, 57(3-4), 74-96, https://doi.org/10.1016/j.marmicro.2005.07.004
    Details
    Publication Date: 2024-01-09
    Description: The global warming trend of the latest Oligocene was interrupted by several cooling events associated with Antarctic glaciations. These cooling events affected surface water productivity and plankton assemblages. Well-preserved radiolarians were obtained from upper Oligocene to lower Miocene sediments at Ocean Drilling Program (ODP) Leg 199 Sites 1218 and 1219 in the equatorial Pacific, and 110 radiolarian species were identified. Four episodes of significant radiolarian faunal changes were identified: middle late Oligocene (27.5 to 27.3 Ma), latest Oligocene (24.4 Ma), earliest Miocene (23.3 Ma), and middle early Miocene (21.6 Ma). These four episodes approximately coincide with increases and decreases of biogenic silica accumulation rates and increases in delta18O values coded as „Oi“ and „Mi“ events. These data indicate that Antarctic glaciations were associated with change of siliceous sedimentation patterns and faunal changes in the equatorial Pacific. Radiolarian fauna was divided into three assemblages based on variations in radiolarian productivity, species richness and the composition of dominant species: a late Oligocene assemblage (27.6 to 24.4 Ma), a transitional assemblage (24.4 to 23.3 Ma) and an early Miocene assemblage (23.3 to 21.2 Ma). The late Oligocene assemblage is characterized by relatively high productivity, low species richness and four dominant species of Tholospyris anthophora, Stichocorys subligata, Lophocyrtis nomas and Lithelius spp. The transitional assemblage represents relatively low values of productivity and species richness, and consists of three dominant species of T. anthophora, S. subligata and L. nomas. The characteristics of the early Miocene assemblage are relatively low productivity, but high species richness. The two dominant species present in this assemblage are T. anthophora and Cyrtocapsella tetrapera. The most significant faunal turnover of radiolarians is marked at the boundary between the transitional/early Miocene assemblages.
    Keywords: 199-1218A; 199-1219A; DRILL; Drilling/drill rig; Joides Resolution; Leg199; North Pacific Ocean; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 6
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    Radiolarian assemblages of the late Neogene North Pacific (2007)
    PANGAEA
    In:  Supplement to: Kamikuri, Shin-Ichi; Nishi, Hiroshi; Motoyama, Isao (2007): Effects of late Neogene climatic cooling on North Pacific radiolarian assemblages and oceanographic conditions. Palaeogeography, Palaeoclimatology, Palaeoecology, 249(3-4), 370-392, https://doi.org/10.1016/j.palaeo.2007.02.008
    Details
    Publication Date: 2024-01-09
    Description: Radiolarian census and abundance data were collected from three deep-sea cores drilled by the Ocean Drilling Program Sites 884, 887 and 1151 to investigate patterns of ecologic changes in space and time during the last 16 million years for the mid-latitude to subarctic North Pacific. High concentrations of radiolarians occurred between 9.0 and 2.7 Ma. Radiolarian species richness was highest in the early middle Miocene at each site and gradually decreased up to about 7 Ma, coinciding with a well-established global cooling trend. A degree of overlap index calculated for radiolarian assemblages revealed 11 faunal change events, of which 8 corresponded to global cooling events and expansions of polar ice sheets. Three of the faunal change events were observed within the peak of radiolarian accumulation rate and were ascribed to changes in primary productivity in the North Pacific rather than global climatic changes. Our assemblage analyses revealed that north–south differentiation in radiolarian assemblages in the northwestern Pacific has existed since 16 Ma and became more distinct via major steps at 6.8 Ma and 2.7 Ma, coinciding with major glaciation events, and that east–west faunal contrasts in the subarctic region became obvious beginning at 11.7 Ma and changed to a different mode around 6.8 Ma. The observed east–west faunal differences possibly reflect east to west climate differences that were characterized by cooler temperatures in the east than the west during the late Miocene (11.7-6.8 Ma) and then by the opposite temperature trend (6.8 Ma-Recent). A severe glaciation at 2.7 Ma played a large role, particularly in temporal changes in radiolarian accumulation rate and assemblage composition.
    Keywords: 145-884; 145-884B; 145-887C; 186-1151A; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg145; Leg186; North Pacific Ocean; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 8 datasets
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  • 7
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    (Table 24) Cleaned MS and GRA from Site U1333 on revised CCSF-A (2012)
    PANGAEA
    Details
    Publication Date: 2023-12-14
    Keywords: 320-U1333; COMPCORE; Composite Core; Density; Depth, composite revised; Exp320; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Pacific Equatorial Age Transect I; Susceptibility
    Type: Dataset
    Format: text/tab-separated-values, 30638 data points
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  • 8
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    (Table 25) Cleaned MS and GRA from Site U1334 on revised CCSF-A (2012)
    PANGAEA
    Details
    Publication Date: 2023-12-14
    Keywords: 320-U1334; COMPCORE; Composite Core; Density; Depth, composite revised; Exp320; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Pacific Equatorial Age Transect I; see reference(s); Susceptibility
    Type: Dataset
    Format: text/tab-separated-values, 53784 data points
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  • 9
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    (Table T2) Relative abundance of selected radiolarian species from ODP Hole 199-1219A sediments (2005)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 199-1219A; Acrobotrys disolenia; Acrocubus octopylus; Acrosphaera spinosa echinoides; Amphistylus angelinus; Amphymenium amphistylium; Anthocyrtidium adiaphorum; Anthocyrtidium marieae; Artophormis gracilis; Axoprunum bispiculum; Bathropyramis woodringi; Botryocyrtis scutum; Botryopyle dictyocephalus; Botryostrobus hollisi; Calocyclas monumentum; Calocycletta robusta; Calocycletta serrata; Calocycletta virginis; Carpocanium rubyae; Carpocanopsis cingulata; Carpocanopsis favosa; Centrobotrys petrushevskayae; Clathrocanium sphaerocephalum; Cornutella profunda; Counting 〉63 µm fraction; Cycladophora conica; Cyrtocapsella cornuta; Cyrtocapsella tetrapera; Dendrospyris binapertonis; Dendrospyris bursa; Dendrospyris inferispina; Dendrospyris megalocephalis; Dendrospyris pannosa; Dendrospyris pododendros; DEPTH, sediment/rock; Dictyocoryne profunda; Didymocyrtis bassanii; Didymocyrtis prismatica; Dorcadospyris ateuchus; Dorcadospyris forcipata; Dorcadospyris papilio; Dorcadospyris platyacantha; Dorcadospyris praeforcipata; Dorcadospyris simplex; DRILL; Drilling/drill rig; Druppatractus coronatus; DSDP/ODP/IODP sample designation; Eucyrtidium anomalum; Eucyrtidium diaphanes; Eucyrtidium hexagonatum; Excentrococcus annulatus; Excentrosphaerella sphaeroconcha; Giraffospyris annulispina; Giraffospyris circumflexa; Giraffospyris laterispina; Heliodiscus echiniscus; Joides Resolution; Lamprocyclas margatensis; Lamprocyrtis hannai; Leg199; Lipmanella hister; Liriospyris geniculosa; Liriospyris globosa; Liriospyris longicornuta; Liriospyris mutuaria; Lithelius minor; Lithocampe subligata; Lithomelissa gelasinus; Lophocyrtis nomas; Lophocyrtis pegetrum; Lophophaena tekopua; Lophospyris pentagona pentagona; Lychnocanoma apodora; Lychnocanoma elongata; Lychnocanoma grande; Lychnodictyum audax; North Pacific Ocean; Ocean Drilling Program; ODP; Periphaena decora; Peripyramis circumtexta; Petalospyris bulbosa; Phormocyrtis alexandrae; Phormospyris stabilis; Phormospyris tricornis; Phormostichoartus fistula; Phorticium pylonium; Prunopyle titan; Psychospyris parva; Radiolarian zone; Sample code/label; Saturnalis circularis; Siphocampe lineata group; Siphonosphaera patinaria; Siphostichartus corona; Siphostichartus praecorona; Sphaeropyle robusta; Spirocyrtis subtilis; Spongasteriscus marylandiscus; Spongocore puella; Spongodiscus klingi; Spongotrochus glacialis; Stichocorys delmontensis; Stylatractus neptunus; Stylatractus santaennae; Stylodictya multispina; Stylodictya validispina; Theocorys bianulus; Theocorys spongoconum; Theocyrtis annosa; Tholospyris anthophora; Tympanomma binoctonum; Valkyria pukapuka
    Type: Dataset
    Format: text/tab-separated-values, 14832 data points
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  • 10
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    (Table T1) Relative abundance of selected radiolarian species from ODP Hole 199-1218A sediments (2005)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 199-1218A; Acrobotrys disolenia; Acrocubus octopylus; Acrosphaera spinosa echinoides; Amphistylus angelinus; Amphymenium amphistylium; Anthocyrtidium adiaphorum; Anthocyrtidium marieae; Artophormis gracilis; Axoprunum bispiculum; Bathropyramis woodringi; Botryocyrtis scutum; Botryopyle dictyocephalus; Botryostrobus hollisi; Calocyclas monumentum; Calocycletta robusta; Calocycletta serrata; Calocycletta virginis; Carpocanium rubyae; Carpocanopsis cingulata; Carpocanopsis favosa; Centrobotrys petrushevskayae; Clathrocanium sphaerocephalum; Cornutella profunda; Counting 〉63 µm fraction; Cycladophora conica; Cyrtocapsella cornuta; Cyrtocapsella tetrapera; Dendrospyris binapertonis; Dendrospyris bursa; Dendrospyris inferispina; Dendrospyris megalocephalis; Dendrospyris pannosa; Dendrospyris pododendros; DEPTH, sediment/rock; Dictyocoryne profunda; Didymocyrtis bassanii; Didymocyrtis prismatica; Dorcadospyris ateuchus; Dorcadospyris forcipata; Dorcadospyris papilio; Dorcadospyris platyacantha; Dorcadospyris praeforcipata; Dorcadospyris simplex; DRILL; Drilling/drill rig; Druppatractus coronatus; DSDP/ODP/IODP sample designation; Eucyrtidium anomalum; Eucyrtidium diaphanes; Eucyrtidium hexagonatum; Excentrococcus annulatus; Excentrosphaerella sphaeroconcha; Giraffospyris annulispina; Giraffospyris circumflexa; Giraffospyris laterispina; Heliodiscus echiniscus; Joides Resolution; Lamprocyclas margatensis; Lamprocyrtis hannai; Leg199; Lipmanella hister; Liriospyris geniculosa; Liriospyris globosa; Liriospyris longicornuta; Liriospyris mutuaria; Lithelius minor; Lithocampe subligata; Lithomelissa gelasinus; Lophocyrtis nomas; Lophocyrtis pegetrum; Lophophaena tekopua; Lophospyris pentagona pentagona; Lychnocanoma apodora; Lychnocanoma elongata; Lychnocanoma grande; Lychnodictyum audax; North Pacific Ocean; Ocean Drilling Program; ODP; Periphaena decora; Peripyramis circumtexta; Petalospyris bulbosa; Phormocyrtis alexandrae; Phormospyris stabilis; Phormospyris tricornis; Phormostichoartus fistula; Phorticium pylonium; Prunopyle titan; Psychospyris parva; Radiolarian zone; Sample code/label; Saturnalis circularis; Siphocampe lineata group; Siphonosphaera patinaria; Siphostichartus corona; Siphostichartus praecorona; Sphaeropyle robusta; Spirocyrtis subtilis; Spongasteriscus marylandiscus; Spongocore puella; Spongodiscus klingi; Spongotrochus glacialis; Stichocorys delmontensis; Stylatractus neptunus; Stylatractus santaennae; Stylodictya multispina; Stylodictya validispina; Theocorys bianulus; Theocorys spongoconum; Theocyrtis annosa; Tholospyris anthophora; Tympanomma binoctonum; Valkyria pukapuka
    Type: Dataset
    Format: text/tab-separated-values, 7107 data points
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