Middle Eocene to Miocene calcareous nannofossil of ODP Leg 125


Autoria(s): Xu, Yulin; Wise, Sherwood W
Cobertura

MEDIAN LATITUDE: 31.199000 * MEDIAN LONGITUDE: 141.284800 * SOUTH-BOUND LATITUDE: 30.861000 * WEST-BOUND LONGITUDE: 141.226000 * NORTH-BOUND LATITUDE: 31.875000 * EAST-BOUND LONGITUDE: 141.314200 * DATE/TIME START: 1989-03-16T18:00:00 * DATE/TIME END: 1989-04-04T12:00:00

Data(s)

24/11/1992

Resumo

During Ocean Drilling Program Leg 125, a thick sequence of middle Eocene to Pleistocene pelagic sediments, volcanogenic sediments, and predominantly extrusive volcanic rocks was recovered. Calcareous nannofossils were examined from 15 holes at nine sites, but Eocene to Miocene calcareous nannofossils were found only from Holes 782A, 784A, 786A, and 786B. In portions of Holes 786A and 786B, datable nannofossil oozes were found intercalated among volcanic flows. The nannofossil biostratigraphy of these holes indicates the presence of three well-defined hiatuses: within the lower Oligocene, between the upper Oligocene and middle Miocene, and between the middle and upper Miocene. An attempt was made to correlate the magnetochronological data with the first or last occurrences of the following species: Sphenolithus distentus, Reticulofenestra bisecta, Reticulofenestra reticulata, and Cyclicargolithus floridanus abisectus n. comb. The results indicate that the FO of Sphenolithus distentus can extend down to Zone CP16 (34.7 Ma), the LO of Reticulofenestra bisecta best defines the boundary between CP19a and CP19b (23.5 Ma), and the LO of Cyclicargolithus f. abisectus n. comb, can extend up to Subzone CN5a (12.5 Ma). No latest Oligocene Cyclicargolithus f. abisectus n. comb, acme was observed. Cyclicargolithus abisectus is considered a subspecies or variant of Cyclicargolithus floridanus because their LOs coincide. As a consequence of these observations, we have modified the definitions of Bukry's Subzones CP14a, CP14b, and CNla. Analyses of sediment-accumulation rates indicate that the rates increased gradually from the Eocene to Miocene. This is especially evident since the late Miocene in Hole 782A. In different parts of the Izu-Bonin forearc basin, however, the rate is not everywhere the same and appears to vary according to the import of volcanogenic materials.

Formato

application/zip, 3 datasets

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.729524

doi:10.1594/PANGAEA.729524

Idioma(s)

en

Publicador

PANGAEA

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Xu, Yulin; Wise, Sherwood W (1992): Middle Eocene to Miocene calcareous nannofossils of Leg 125 from the western Pacific Ocean. In: Fryer, P; Pearce, JA; Stokking, LB; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 125, 43-70, doi:10.2973/odp.proc.sr.125.142.1992

Palavras-Chave #125-782A; 125-786A; A. delicatus; A. primus; A. tricorniculatus; A = abundant, C = common, F = few, R = rare; after Bukry 1973, 1975; Age model; Age model, optional; Age model, paleomag, Berggren et al (1985); Age model opt; Ageprof dat des; Ageprofile Datum Description; Amaurolithus delicatus; Amaurolithus primus; Amaurolithus tricorniculatus; B. spinosus; Berggren et al. (1985a, b); Blackites spinosus; C. altus; C. californicus; C. calyculus; C. coalitus; C. consuetus; C. dela; C. eopelagicus; C. expansus; C. fenestratus; C. floridanus f abisectus; C. floridanus floridanus; C. formosus; C. grandis; C. leptoporus; C. macintyrei; C. mexicanus; C. miopelagicus; C. nitescens; C. oamaruensis; C. pelagicus; C. protoannulus; C. solitus; C. staurion; C. umbrellus; Calcidiscus leptoporus; Calcidiscus macintyrei; Calcidiscus protoannulus; Campylosphaera dela; Catinaster calyculus; Catinaster coalitus; Catinaster mexicanus; Catinaster umbrellus; Chiasmolithus altus; Chiasmolithus californicus; Chiasmolithus consuetus; Chiasmolithus expansus; Chiasmolithus grandis; Chiasmolithus oamaruensis; Chiasmolithus solitus; Clausicoccus fenestratus; Coccolithus eopelagicus; Coccolithus formosus; Coccolithus miopelagicus; Coccolithus pelagicus; Coccolithus staurion; Coronocyclus nitescens; Cyclicargolithus floridanus floridanus; Cyclicargolithus floridanus forma abisectus; D. archipelagoensis; D. asymmetricus; D. aulakos; D. barbadiensis; D. berggrenii; D. bifax; D. binodosus; D. blackstockae; D. brouweri; D. calcaris; D. challengerii; D. daviesii; D. decorus; D. deflandrei; D. delicatus; D. divaricatus; D. druggii; D. exilis; D. hamatus; D. intercalaris; D. kugleri; D. neorectus; D. pansus; D. pentaradiatus; D. quinqueramus; D. saipanensis; D. sanmiguelensis; D. scrippsae; D. stellatus; D. subdeflandrei; D. surculus; D. tanii; D. tanii nodifer; D. triradiatus; D. variabilis; Depth; DEPTH, sediment/rock; Dictyococcites daviesii; Dictyococcites scrippsae; Discoaster archipelagoensis; Discoaster asymmetricus; Discoaster aulakos; Discoaster barbadiensis; Discoaster berggrenii; Discoaster bifax; Discoaster binodosus; Discoaster blackstockae; Discoaster brouweri; Discoaster calcaris; Discoaster challengerii; Discoaster decorus; Discoaster deflandrei; Discoaster delicatus; Discoaster divaricatus; Discoaster druggii; Discoaster exilis; Discoaster hamatus; Discoaster intercalaris; Discoaster kugleri; Discoaster neorectus; Discoaster pansus; Discoaster pentaradiatus; Discoaster quinqueramus; Discoaster saipanensis; Discoaster sanmiguelensis; Discoaster stellatus; Discoaster subdeflandrei; Discoaster surculus; Discoaster tanii; Discoaster tanii nodifer; Discoaster triradiatus; Discoaster variabilis; DRILL; Drilling/drill rig; Epoch; FO = first occurrence, LO = last occurrence; G = good, M = moderate, P = poor; H. burkei; H. carteri; H. compacta; H. dinesenii; H. euphratis; H. granulata; H. heezenii; H. kamptneri; H. obliqua; H. perch-nielseniae; H. recta; H. scissura; H. sellii; H. seminulum; H. wallichii; H. wilcoxonii; Helicosphaera burkei; Helicosphaera carteri; Helicosphaera compacta; Helicosphaera dinesenii; Helicosphaera euphratis; Helicosphaera granulata; Helicosphaera heezenii; Helicosphaera kamptneri; Helicosphaera obliqua; Helicosphaera perch-nielseniae; Helicosphaera recta; Helicosphaera scissura; Helicosphaera sellii; Helicosphaera seminulum; Helicosphaera spp.; Helicosphaera wallichii; Helicosphaera wilcoxonii; I. recurvus; Isthmolithus recurvus; Joides Resolution; L. minutus; Lanternithus minutus; Leg125; Lithologic unit/sequence; M. inversus; Markalius inversus; N. cristata; Nannofossil abundance; Nannofossils preservation; Nannofossil zone; Nannos abund; Nannos preserv; Nannos zone; Nannotetrina cristata; Neococcolithes spp.; North Pacific Ocean; Ocean Drilling Program; ODP; ODP sample designation; P. multipora; Pontosphaera multipora; Pontosphaera spp.; R. bisecta; R. clavigera; R. hillae; R. minuta; R. minutula; R. ornata; R. pseudoumbilicus; R. reticulata; R. samodurovii; R. umbilicus; Reticulofenestra bisecta; Reticulofenestra hillae; Reticulofenestra minuta; Reticulofenestra minutula; Reticulofenestra ornata; Reticulofenestra pseudoumbilicus; Reticulofenestra reticulata; Reticulofenestra samodurovii; Reticulofenestra umbilicus; Rhabdosphaera clavigera; S. abies; S. aranta; S. celsus; S. ciperoensis; S. conicus; S. distentus; S. furcatolithoides; S. heteromorphus; S. intercalaris; S. moriformis; S. obtusus; S. predistentus; S. primus; S. procera; S. pseudoradians; S. radians; S. spiniger; Sample code/label; Scyphosphaera aranta; Scyphosphaera procera; Smear slide analysis; Sphenolithus abies; Sphenolithus celsus; Sphenolithus ciperoensis; Sphenolithus conicus; Sphenolithus distentus; Sphenolithus furcatolithoides; Sphenolithus heteromorphus; Sphenolithus intercalaris; Sphenolithus moriformis; Sphenolithus obtusus; Sphenolithus predistentus; Sphenolithus primus; Sphenolithus pseudoradians; Sphenolithus radians; Sphenolithus spiniger; T. carinatus; T. milowii; T. rugosus; this study; Thoracosphaera spp.; Triquetrorhabdulus carinatus; Triquetrorhabdulus milowii; Triquetrorhabdulus rugosus; U. sibogae; Umbilicosphaera sibogae; Unit; Z. bijugatus; Zygrhablithus bijugatus
Tipo

Dataset