(Appendix A) Radiolarian abundance in ODP Hole 202-1241A, supplement to: Kamikuri, Shin-Ichi; Motoyama, Isao; Nishi, Hiroshi; Iwai, Masao (2009): Evolution of Eastern Pacific Warm Pool and upwelling processes since the middle Miocene based on analysis of radiolarian assemblages: Response to Indonesian and Central American Seaways. Palaeogeography, Palaeoclimatology, Palaeoecology, 280(3-4), 469-479

• Main Authors: Kamikuri, Shin-Ichi, Motoyama, Isao, Nishi, Hiroshi, Iwai, Masao
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2009
• Subjects: AGE; DEPTH, sediment/rock; Sample code/label; Botryostrobus auritus/australis; Eucyrtidium acuminatum; Heliodiscus asteriscus; Hexapyle spp.; Hymeniastrum euclidis; Lamprocyclas maritalis; Larcospira quadrangula; Tetrapyle octacantha; Acrosphaera spinosa; Collosphaera spp.; Dictyocoryne profunda; Didymocyrtis tetrathalamus tetrathalamus; Euchitonia elegans; Stylodictya multispina; Spongaster tetras; Acanthodesmia vinculata; Amphirhopalum ypsilon; Carpocanistrum flosculum; Diartus spp.; Didymocyrtis spp.; Larcospira moschkovskii; Siphonosphaera spp.; Stylochlamydium asteriscus; Stylodictya aculeata; Zygocircus productus; Actinomma boreale; Dictyophimus crisiae; Larcopyle buetschlii; Larcopyle weddellium; Liriospyris reticulata; Spongopyle osculosa; Thecosphaera inermis; Actinomma delicatulum; Botryostrobus aquilonaris; Cornutella profunda; Siphocampe arachnea; Acrosphaera murrayana; Cycladophora davisiana; Dictyophimus infabricatus; Lamprocyrtis nigriniae; Lithelius minor; Lithomelissa setosa; Pterocorys minythorax; Radiolarians, surface water depth; Radiolarians, intermediate water depth; Radiolarians, deep water; Radiolarians, upwelling; Ratio; Species richness; Shannon Diversity Index; Equitability; Pianka's degree of overlap; Acanthosphaera circopora; Acrobotrys tritubus; Acrocubus octopylus; Actinomma antarcticum; Actinomma leptodermum; Actinomma medianum; Actinomma popofskii; Actinomma sp.; Actinomma spp.; Actinosphaera haeckeli; Albatrossidium spp.; Amphiplecta sp.; Amphirhopalum straussii; Amphispyris costata; Amphispyris sternalis; Amphispyris subquadrata; Amphistylus angelinus; Amphistylus sp.; Amphymenium amphistylium; Anomalacantha dentata; Anomalacantha sp.; Anthocyrtidium adiaphorum; Anthocyrtidium angulare; Anthocyrtidium ehrenbergi; Anthocyrtidium jenghisi; Anthocyrtidium nosicaae; Anthocyrtidium ophirense; Anthocyrtidium pliocenica; Anthocyrtidium zanguebaricum; Axoprunum bispiculum; Axoprunum spp.; Axoprunum stauraxonium; Bathropyramis woodringi; Botryocyrtis scutum; Botryostrobus bramlettei; Botryostrobus miralestensis; Calocyclas monumentum; Calocycletta caepa; Calocycletta cladala; Calocycletta costata; Calocycletta robusta; Calocycletta serrata; Calocycletta virginis; Cannartus sp.; Carpocanistrum acutidentatum; Carpocanistrum cephalum; Carpocanistrum papillosum; Carpocanistrum spp.; Carpocanium sp.; Carpocanopsis favosa; Carpocanopsis obovata; Carpocanopsis sp.; Carpocanthum monostylum; Carposphaera acanthophora; Cenosphaera spp.; Centrobotrys thermophila; Ceratocyrtis galeus; Ceratocyrtis histricosus; Ceratocyrtis spp.; Clathrocyclas monumentum; Cycladophora bicornis; Cycladophora cabrilloensis; Cycladophora conica; Cycladophora cornutoides; Cycladophora sp.; Cycladophora spp.; Cyclampterium brachythorax; Cyclampterium neatum; Cyclampterium tanythorax; Cyrtocapsella cornuta; Cyrtocapsella japonica; Cyrtocapsella tetrapera; Cyrtopera aglaolampa; Dendrospyris binapertonis; Dendrospyris damaecornis; Dendrospyris spp.; Dictyophimus hirundo group; Dictyophimus splendens; Druppatractus coronatus; Druppatractus hastatus; Druppatractus irregularis; Druppatractus ostracion; Druppatractus sp.; Druppatractus spp.; Druppatractus testudo; Druppatractus variabilis; Ellipsostylus salebrosus; Ellipsoxiphus atractus; Eucecryphalus gegenbauri; Eucecryphalus tricostatus; Eucecrypnalus spp.; Eucyrtidium aff. anomalum; Eucyrtidium anomalum; Eucyrtidium calvertense; Eucyrtidium cienkowskii; Eucyrtidium diaphanes; Eucyrtidium heptacolum; Eucyrtidium hexastichum; Eucyrtidium teuscheri; Excentrococcus annulatus; Excentrosphaerella spp.; Giraffospyris annulispina; Gondwanaria campanulaeformis; Haeckeliella macrodoras; Haeckeliella spp.; Heliodiscus lenticula; Heliodiscus phacodiscus; Helotholus sp.; Hexacontium arachnoidale; Hexacontium enthacanthum; Hexacontium laevigatum; Hexacontium pachydermum; Hexacontium senticetum; Hexacontium sp.; Hexacontium spp.; Hexalonche anaximandri; Hexalonche spp.; Hexastylus spp.; Lamprocyclas sp.; Lamprocyrtis hannai; Lamprocyrtis heteroporos; Lamprocyrtis neoheteroporos; Lampromitra spp.; Larcopyle pylomaticus; Liosphaera antarctica; Lipmanella dictyoceras; Lipmanella pyramidale; Lipmanella sphaerocephalum; Lipmanella spp.; Lipmanella virchowii; Liriospyris longicornuta; Liriospyris mutuaria; Lithelius nautiloides; Lithelius solaris; Lithelius sp.; Lithelius spp.; Lithomelissa spp.; Lithomelissa thoracites; Lithopera bacca; Lithopera neotera; Lithopera renzae; Lithopera thornburgi; Lophophaena cf. capito; Lophophaena spp.; Lophophaenoma witjazii; Lophospyris pentagona pentagona; Lychnocanoma grande; Microcubus amphispyris; Nephrospyris docris; Nephrospyris renilla; Otosphaera auriculata; Otosphaera polymorpha; Peripyramis circumtexta; Phormospyris stabilis capoi; Phormospyris stabilis scaphipes; Phormospyris stabilis stabilis; Phormostichoartus corbula; Phormostichoartus doliolum; Phormostichoartus fistula; Phormostichoartus marylandicus; Phormostichoartus spp.; Phorticium spp.; Plectopyramis dodecomma; Porodiscus microporus; Porodiscus sp.; Porodiscus spp.; Prunopyle titan; Pseudodictyophimus gracilipes; Pseudodictyophimus lectairi; Pseudodictyophimus sp.; Pseudodictyophimus spp.; Pterocanium audax; Pterocanium charybdeum; Pterocanium korotnevi; Pterocanium praetextum eucolpum; Pterocanium praetextum praetextum; Pterocanium prismatium; Pterocanium spp.; Pterocorys campanula; Pterocorys clausus; Pterocorys hertwigii; Pterocorys macroceras; Pterocorys sabae; Pterocorys spp.; Pterocorys zanclaeus; Pteroscenium pinnatum; Pylospira octopyle; Saturnalis circularis; Sethopilium macropus; Siphocampe lineata; Siphostichartus corona; Siphostichartus praecorona; Solenosphaera omnitubus omnitubus; Solenosphaera omnitubus procera; Sphaeropyle robusta group; Spirema sp.; Spirocyrtis gyroscalaris; Spirocyrtis scalaris; Spirocyrtis subscalaris; Spirocyrtis subtilis; Spongaster berminghami; Spongaster pentas; Spongaster sp.; Spongocore puella; Spongodiscus biconcavus; Spongodiscus klingi; Spongodiscus resurgens; Spongodiscus spp.; Spongoliva ellipsoides; Spongotrochus cf. glacialis; Spongurus cf. elliptica; Stichocorys delmontensis; Stichocorys johnsoni; Stichocorys peregrina; Stichocorys wolfii; Stichopilium bicorne; Stylatractus neptunus; Stylatractus santaennae; Stylatractus universus; Stylochlamydium cf. venustum; Stylodictya cf. validispina; Stylosphaera melpomene; Styptosphaera spumacea; Thecosphaera dedoensis; Thecosphaera pseudojaponica; Thecosphaera sp.; Thecosphaera spp.; Theocorys bianulus; Theocorys veneris; Theocorythium trachelium diannae; Theocorythium trachelium trachelium; Theocorythium vetulum; Tholoma metallasson; Tholospyris anthophora; Tholospyris infericosta; Tholospyris ramosa; Tholospyris sp.; Tripospyris semantis; Trisolenia megalactis costlowi; Trisolenia megalactis megalactis; Zygocircus spp.; Drilling/drill rig; DSDP/ODP/IODP sample designation; Counting >63 µm fraction; Calculated; Calculated after Shannon 1948; Leg202; Joides Resolution; Ocean Drilling Program ODP; Pacific; Titan; Antarc*; Antarctica
• Online Access: https://dx.doi.org/10.1594/pangaea.776080; https://doi.pangaea.de/10.1594/PANGAEA.776080

A quantitative radiolarian study at Ocean Drilling Program Site 1241 in the eastern tropical Pacific enables us to reconstruct paleoceanographic changes that occurred since the latest middle Miocene. Today, this site is located just under the Eastern Pacific Warm Pool (EPWP). Based on the abundance variations of radiolarian characteristic species which are indicators of upwelling and thermocline changes, it is suggested that three notable changes occurred at 10.6, 9.8, and 4.2 Ma in the region. Four distinct periods of oceanographic conditions bounded by these notable changes were characterized on the basis of the following: (1) stratified seawater (12.0 to 10.6 Ma); (2) a shallowing of the thermocline and an increasing of upwelling (10.6 to 9.8 Ma); (3) significant inflow of warm water to the eastern tropical Pacific caused by an intensified Northern Equatorial Countercurrent (NECC), resulting in the formation of EPWP (9.8 to 4.2 Ma); and (4) the reduction of the EPWP and the NECC, and an increase in upwelling (4.2 to 0 Ma). The timing of these paleoceanographic events indicated the strong relations with the opening and closing of the Indonesian and Central American (Panama) Seaways. The reduction of the EPWP (this study) and the deepening of the thermocline in western Pacific at about 4.2 Ma (Cannariato and Ravelo, 1997; Chaisson and Ravelo, 2000) indicated a change from a state resembling El Niño in the late Miocene and the early Pliocene time to a state resembling La Niña by the late Pliocene : Sediment depth is given in mcd.