Calcareous nannofossil events of DSDP Hole 31-292

Calcareous nannofossil assemblages from land sections of the Japanese Islands and DSDP Holes in the equatorial to high latitude regions of the Pacific Ocean were analyzed in an effort to reconstruct their late Pliocene paleobiogeography. While the late Pliocene assemblages in the equatorial to middl...

Full description

Bibliographic Details
Main Authors: Sato, Tokiyuki, Saito, Takato, Yuguchi, Shiho, Nakagawa, Hiroshi, Kameo, Koji, Takayama, Toshiaki
Format: Dataset
Language:English
Published: PANGAEA 2002
Subjects:
31-292
Age model
GPTS (geomagnetic polarity timescale)
Cande and Kent (1995)
Ageprofile Datum Description
Deep Sea Drilling Project
Depth
bottom/max
sediment/rock
top/min
DRILL
Drilling/drill rig
DSDP
Glomar Challenger
Leg31
North Pacific/Philippine Sea/CONT RISE
Arctic
Pacific
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.706116
https://doi.org/10.1594/PANGAEA.706116
Description
Summary:Calcareous nannofossil assemblages from land sections of the Japanese Islands and DSDP Holes in the equatorial to high latitude regions of the Pacific Ocean were analyzed in an effort to reconstruct their late Pliocene paleobiogeography. While the late Pliocene assemblages in the equatorial to middle latitude regions are comprised primarily of discoasters, both the high latitude and Japan Sea samples record an abrupt change from a Reticulofenestra-Dictyococcite assemblage to a Coccolithus pelagicus assemblage at 2.75 Ma. The northernmost boundary of the Discoaster assemblage moved southward in the East China Sea (western Pacific Ocean) at that time. These changes in the calcareous nannofossil paleobiogeography indicate the strong influence of heavy glaciation in high latitude to arctic regions of the Pacific Ocean. This also correlates with the final closure of the Central American seaway at 2.75 Ma.

Similar Items