Diatoms in Paleocene sediments of the southwestern South Atlantic

Autoria(s): Fenner, Juliane M
Cobertura

MEDIAN LATITUDE: -45.115207 * MEDIAN LONGITUDE: -12.223533 * SOUTH-BOUND LATITUDE: -51.533000 * WEST-BOUND LONGITUDE: -33.099300 * NORTH-BOUND LATITUDE: -11.336800 * EAST-BOUND LONGITUDE: 88.718000 * DATE/TIME START: 1972-02-08T00:00:00 * DATE/TIME END: 1987-04-15T22:59:00
Data(s)

17/12/1991
Resumo

The taxonomy and stratigraphy of pelagic Paleocene diatoms from ODP Sites 698, 700, and 702 and DSDP Site 524 in the South Atlantic and DSDP Site 214 in the Indian Ocean are presented, as well as paleogeographic and paleoecologic implications. Eleven new species and one new variety are described and one new combination is proposed: Coscinodiscus cruxii sp. nov. Grunowiella palaeocaenica var. alternans var. nov. Hemiaulusl beatus sp. nov. Hemiaulusl ciesielskii sp. nov. Hemiaulusl conicus sp. nov. Hemiaulus kristoffersenii sp. nov. Hemiaulus nocchiae sp. nov. Hemiaulusl oonkii sp. nov. Hemiaulusl velatus sp. nov. Triceratium gombosii sp. nov. Trochosira gracillima comb. nov. Trochosira marginata sp. nov. Trochosira radiata sp. nov. Hole 700B provides one of the most continuous diatomaceous Paleocene profiles known. Stratigraphic ranges of diatom species from this and other Southern Hemisphere sites are calibrated against calcareous microfossil zones. The first-appearance datums of Triceratium gombosii, Hemiaulus incurvus, and Triceratium mirabile in Paleocene deep-sea sediments are useful for regional stratigraphic correlations. Quantitative analysis of the biosiliceous microfossil groups (diatoms, silicoflagellates, radiolarians, and archaeomonadaceae) shows that preservation of diatoms is confined primarily to the upper Paleocene (planktonic foraminifer Zones P3 and P4 and calcareous nannofossil Zones upper NP5 to lower NP9). In the lower Paleocene only short intervals in Hole 700B are diatomaceous. A correlation between the degree of silica diagenesis and the calcium carbonate content of the sediment is not obvious. Diatom species analysis reflects changes in the paleoenvironment between island-related upwelling conditions with highly diverse and well-preserved diatom assemblages and less productive periods resulting in less wellpreserved diatom assemblages with a higher content of robust neritic diatoms.
Formato

application/zip, 3 datasets
Identificador

https://doi.pangaea.de/10.1594/PANGAEA.755367

doi:10.1594/PANGAEA.755367
Idioma(s)

en
Publicador

PANGAEA
Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted
Fonte

Supplement to: Fenner, Juliane M (1991): Taxonomy, stratigraphy, and paleoceanographic implications of Paleocene diatoms. In: Ciesielski, PF; Kristoffersen, Y; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 114, 123-154, doi:10.2973/odp.proc.sr.114.137.1991
Palavras-Chave #114-698A; 114-700B; 114-702B; 22-214; 73-524A; A. reticulatum; Acanthodiscus spp.; Acanthosphaeridium reticulatum; Actinoptychus spp.; Anaulus spp.; Arachnoidiscus spp.; Ash, volcanic; Aulacodiscus spp.; Briggera spp.; C. aff. anissimovae; C. argus; C. bulliens; C. clavigerus; C. cruxii; C. uralensis; Chaetoceros clavigerus; Coscinodiscus aff. anissimovae; Coscinodiscus argus; Coscinodiscus bulliens; Coscinodiscus cruxii; Coscinodiscus sp.; Coscinodiscus uralensis; Deep Sea Drilling Project; Diatom preserv; Diatom preservation; Diatoms indet; Diatoms indeterminata; DRILL; Drilling/drill rig; DSDP; Ethmodiscus spp.; Eunotogramma spp.; Event; F. barbadensis; Fenestrella barbadensis; fragments; G. gemmata; G. palaeoceanica var. alternans; G. palaeoceanica var. palaeoceanica; G = good, M = moderate, P = poor; Genus et species indet (1) Fenner (1978); genus questionable; genus questionable, var.; Glomar Challenger; Goniothecium spp.; Grunowiella gemmata; Grunowiella palaeoceanica var. alternans; Grunowiella palaeoceanica var. palaeoceanica; H. aff. ciesielskii; H. aff. grassus; H. aff. speciosus; H. affinis; H. altus; H. ambiguus; H. beatus; H. ciesielskii; H. conicus; H. elegans var. intermedia; H. fragilis; H. grassus; H. inaequilaterus; H. incisus; H. incurvus; H. kristofferseni; H. nocchiae; H. oonkii; H. peripterus; H. polymorphus var. charkovianus; H. rossicus; H. subacutus; H. velatus; Hemiaulus aff. ciesielskii; Hemiaulus aff. grassus; Hemiaulus aff. speciosus; Hemiaulus affinis; Hemiaulus altus; Hemiaulus beatus; Hemiaulus ciesielskii; Hemiaulus conicus; Hemiaulus elegans var. intermedia; Hemiaulus fragilis; Hemiaulus grassus; Hemiaulus inaequilaterus; Hemiaulus incisus; Hemiaulus incurvus; Hemiaulus kristofferseni; Hemiaulus nocchiae; Hemiaulus oonkii; Hemiaulus peripterus; Hemiaulus polymorphus var. charkovianus; Hemiaulus rossicus; Hemiaulus sp.; Hemiaulus subacutus; Hemiaulus velatus; Hyalodiscus ambiguus; Hyalodiscus sp.; Indian Ocean//RIDGE; Joides Resolution; Label; Leg114; Leg22; Leg73; Melosira sp.; O. cristata; Ocean Drilling Program; Odontotropis cristata; Odontotropis sp.; ODP; ODP sample designation; oval; P. aculeifera; P. aculeifera var. spinosa; P. angulatus; P. bella; P. carinifera; P. clavata; P. evermanni; P. kittoniana; P. russica; P. simplex; P. sulcata; P. tempereana; Paralia sp.; Paralia sulcata; Pseudopodosira bella; Pseudopodosira simplex; Pseudopyxilla russica; Pseudopyxilla tempereana; Pseudostictodiscus angulatus; Pseudostictodiscus sp.; Pterotheca aculeifera; Pterotheca aculeifera var. spinosa; Pterotheca carinifera; Pterotheca clavata; Pterotheca evermanni; Pterotheca kittoniana; Pterotheca sp.; R. cretacea; R. hebetata v; Rhizosolenia cretacea; Rhizosolenia hebetata var.; S. discrepans; S. exculptum; S. hemiauloides; S. lavrenkoi; S. ligulatus; S. marginata; S. microtrias; S. primalabiata; S. schulzii; S. turris var. cylindricus; S. turris var. intermedia; Sample code/label; Sceptroneis ligulatus; Sceptroneis sp.; sensu Gombos (1977); Solium exculptum; South Atlantic/CANYON; South Atlantic Ocean; sp. 1; sp. 2; sp. F Harwood (1988); Sphynctolethus hemiauloides; Stellarima microtrias; Stellarima primalabiata; Stephanopyxis discrepans; Stephanopyxis lavrenkoi; Stephanopyxis marginata; Stephanopyxis schulzii; Stephanopyxis sp.; Stephanopyxis turris var. cylindricus; Stephanopyxis turris var. intermedia; T. aff. mirabilis; T. areolatum f minor; T. aries; T. cellulosum; T. conifera; T. deciusii; T. excavata; T. excavata tetragona; T. gombosii; T. gracilima; T. gracillima; T. heibergii; T. marginata; T. mirabile; T. pileolus; T. radiata; T. schulzii; T. senta; T. simulacrum; T. wittii; Thalassiosira spp.; Triceratium areolatum forma minor; Triceratium cellulosum; Triceratium gombosii; Triceratium heibergii; Triceratium mirabile; Triceratium schulzii; Triceratium spp.; Triceratuum cellulosum; Trinacria aries; Trinacria conifera; Trinacria deciusii; Trinacria excavata; Trinacria excavata tetragona; Trinacria gracilima; Trinacria pileolus; Trinacria senta; Trinacria simulacrum; Trinacria sp.; Trinacria wittii; Trochosira aff. mirabilis; Trochosira gracillima; Trochosira marginata; Trochosira radiata; Trochosira sp.; Volc ash; X. aff. structuralis; Xanthiopyxis aff. structuralis; Xanthiopyxis sp.
Tipo

Dataset
Acesso ao item digital