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Pliocene benthic foraminiferal abundances of ODP Hole 105-646B from north Atlantic

Dataset homepage

Citation

Zhang J, Scott D B (1996). Pliocene benthic foraminiferal abundances of ODP Hole 105-646B from north Atlantic. PANGAEA - Data Publisher for Earth & Environmental Science. Occurrence dataset https://doi.org/10.1594/pangaea.758101 accessed via GBIF.org on 2025-07-13.

Description

Our benthic foraminiferal data clearly indicate eight layers of deep-water turbidites during the Messinian (MTL 1-8) and one in the early Pliocene (PTL 1) in Ocean Drilling Program Leg 105, Site 646B. These deep-water tuibidite deposits are characterized by highly concentrated agglutinated marsh benthic foraminifera (e.g., Trochammina cf. squamata, Ammotium sp. A, Miliammina fusca), rounded quartz, polished thick-walled benthic foraminifera, wood fragments, plant seeds, plant fruit, and highly concentrated mica and are interbedded with sediments containing deep-water benthic faunas. We suggest these turbidites deposited during sea-level low stands (approx. 80-100 m below sea level), and their ages are tentatively correlated to 6.59, 6.22, 6.01, 5.89, 5.75, 5.7, 5.65, 5.60, and 5.55 Ma, respectively, based on the Messinian oxygen isotope enrichments at Site 552A of Deep Sea Drilling Project Leg 81. The turbidites layers during the late Messinian, coeval with frequent climate changes suggested by six oxygen enrichment excursions of Site 552A, may have been in part linked to the late Messinian evaporite deposits in the Mediterranean Basin. The most profound climate changes at 5.75 and 5.55 Ma may have been related to the Lower and Upper Evaporites in the Mediterranean Basin.

Taxonomic Coverages

  1. Chromista
    rank: kingdom
  2. Foraminifera
    rank: kingdom

Geographic Coverages

Event: 105-646B, Labrador Sea ;

Bibliographic Citations

Contacts

Jijun Zhang
originator
David B Scott
originator
metadata author
PANGAEA - Data Publisher for Earth & Environmental Science
email: info@pangaea.de
homepage: https://www.pangaea.de
Frank-Oliver Glöckner
administrative point of contact
Robert Huber
administrative point of contact
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