Biochronology of the mid-Pliocene Sphaeroidinella event

Author(s): Kucera, Michal
Author Affiliation(s): Primary:
Goteborg University, Department of Earth Sciences-Marine Geology, Goteborg, Sweden
Volume Title: Marine Micropaleontology
Source: Marine Micropaleontology, 35(1-2), p.1-16. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0377-8398 CODEN: MAMIDH
Note: In English. Includes appendices. 50 refs.; illus., incl. 1 table
Summary: Morphological evolution in the late Neogene planktonic foraminifer Sphaeroidinella lineage involves a sudden increase of the percentage of specimens equipped with supplementary apertures (from <30% to >70%) in the mid-Pliocene (about 3.5 Ma). This evolutionary transition, marked by the first occurrence of specimens with large supplementary apertures in the lineage, is denoted the Sphaeroidinella event. Changes in the proportions of the supplementary apertures in the lineage were studied in 24 samples from ODP Hole 926A drilled in the equatorial Atlantic Ocean. In addition, detailed chronological models have been compiled for this section as well as for Pliocene sections from DSDP Holes 214, 502A, and 503B, where evolution in the lineage have been analyzed previously. Stratigraphic correlation of the studied sequences suggests that the Sphaeroidinella event took place at about 3.6 Ma in the eastern equatorial Pacific (Hole 503B) and at 3.5-3.6 Ma in the Caribbean (Hole 502A), while in the Atlantic Ocean (Hole 926A) and in the Indian Ocean (Hole 214) the event occurred after 3.5 Ma. The inferred diachrony of the mid-Pliocene Sphaeroidinella transition, which is considered to represent a prime example of punctuated anagenesis, suggests that this evolutionary modality may have an allopatric component. Its short duration (on average less than 50 ka) and the detailed biochronology that could be established for this event qualifies it as a useful biostratigraphic tool in the low-latitude Pliocene oceans. Abstract Copyright (1998) Elsevier, B.V.
Year of Publication: 1998
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Ocean; Biochronology; Biologic evolution; Biostratigraphy; Caribbean Sea; Cenozoic; Correlation; DSDP Site 214; DSDP Site 502; DSDP Site 503; Deep Sea Drilling Project; Foraminifera; Globigerinacea; Globigerinidae; IPOD; Indian Ocean; Invertebrata; Leg 154; Leg 22; Leg 68; Microfossils; Middle Pliocene; Morphology; Neogene; North Atlantic; ODP Site 926; Ocean Drilling Program; Pacific Ocean; Paleo-oceanography; Planktonic taxa; Pliocene; Protista; Rotaliina; Sphaeroidinella; Stratigraphy; Tertiary; World ocean
Coordinates: S112013 S112013 E0884305 E0884305
N112925 N112925 W0792247 W0792247
N040303 N040303 W0953813 W0953813
N034309 N034309 W0425430 W0425430
Record ID: 1999015168
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands