Quantitative Pleistocene calcareous nannofossil biostratigraphy of Leg 86, Site 577 (Shatsky Rise, NW Pacific Ocean)

Author(s): Marino, Maria; Maiorano, Patrizia; Monechi, Simonetta
Author Affiliation(s): Primary:
Universita di Bari, Dipartimento di Geologia e Geofisica, Bari, Italy
Universita di Firenze, Italy
Volume Title: Journal of Nannoplankton Research
Source: Journal of Nannoplankton Research, 25(1), p.25-37. Publisher: International Nannoplankton Association, The Hague, International. ISSN: 1210-8049
Note: In English. 60 refs.; illus., incl. 2 plates, 2 tables, sketch map
Summary: A quantitative study, based on calcareous nannofossil assemblages, has been carried out on the Pleistocene sediments recovered during DSDP Leg 86, from site 577. Site 577 is located on the SW flank of the Shatsky Rise in the NW Pacific Ocean, in 2685m water-depth, and exhibits both good recovery and well-preserved nannofossil assemblages. Most conventional Pleistocene events have been recognised; moreover, quantitative investigations allowed the collection of further data on the stratigraphic distribution of some species (Gephyrocapsa omega >4 µm, Helicosphaera inversa, Reticulofenestra asanoi, Helicosphaera acuta), thus improving the Pleistocene biostratigraphy of the Shatsky Rise sediments. The available magnetostratigraphic data for Site 577 also allowed the proposal of age-assignments for the following events: the last occurrence of H. acuta, the beginning and end of the temporary disappearance of G. omega, the first occurrence, temporary disappearance, and last occurrence of H. inversa, and the first and last occurrences of R. asanoi.
Year of Publication: 2003
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 24 Surficial Geology, Quaternary Geology; Algae; Assemblages; Biostratigraphy; Biozones; Brunhes Chron; Cenozoic; Coccolithophoraceae; DSDP Site 577; Deep Sea Drilling Project; Gephyrocapsa; Gephyrocapsa oceanica; Helicosphaera; IPOD; Leg 86; Magnetostratigraphy; Marine sedimentation; Marine sediments; Matuyama Chron; Microfossils; Nannofossils; North Pacific; Northwest Pacific; Pacific Ocean; Paleomagnetism; Plantae; Pleistocene; Quantitative analysis; Quaternary; Reticulofenestra; Sedimentation; Sedimentation rates; Sediments; Shatsky Rise; Taxonomy; Upper Cenozoic; Upper Quaternary; West Pacific
Coordinates: N322628 N322632 E1574324 E1574323
Record ID: 2004066671
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.