Paleoceanographic, and paleoclimatic constraints on the global Eocene diatom and silicoflagellate record

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doi: 10.1016/j.palaeo.2015.01.015
Author(s): Barron, John A.; Stickley, Catherine E.; Bukry, David
Author Affiliation(s): Primary:
U. S. Geological Survey, Menlo Park, CA, United States
Evolution Applied, United Kingdom
Volume Title: Palaeogeography, Palaeoclimatology, Palaeoecology
Source: Palaeogeography, Palaeoclimatology, Palaeoecology, Vol.422, p.85-100. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 CODEN: PPPYAB
Note: In English. 142 refs.; illus., incl. 3 tables, charts
Summary: Eocene diatom and silicoflagellate biostratigraphy are summarized and correlated with the most recent geologic time scale as well as with the global oxygen isotope and eustatic sea level curves. The global distribution of Eocene diatom/silicoflagellate-bearing sediments varies considerably, reflecting changing oceanic gateways and paleoceanography with changing patterns that are punctuated by four major depositional events. Event 1 (∼ 49 million years ago, Ma), at the end of the Early Eocene Climatic Optimum (EECO), saw the cessation of diatom/silicoflagellate deposition in epicontinental regions of the North Sea region and in the northern Russia and the onset of biosilica deposition in the Arctic. Event 2 (∼ 46 Ma), which coincided with intensification of the middle Eocene cooling trend, marked the widespread expansion of diatom/silicoflagellate deposition in both the North and South Atlantic. A shift of diatom/silicoflagellate deposition from the Atlantic to the Pacific began at Event 3, at the end of the middle Eocene Climatic Optimum (MECO) (∼ 40 Ma), that was likely tied to the initial opening of the Drake Passage between Antarctica and South America. Event 4 (∼ 39 Ma) coincided with a major sea level fall and a widespread deep-sea hiatus in the latest middle Eocene. Late Eocene diatom/silicoflagellate deposition became more concentrated in middle-to-high latitude regions and coastal upwelling regions, particularly in the Pacific Ocean. Tabulation of the first and last occurrences of 132 biostratigraphically-important diatoms suggests increased species turnover during the latest Paleocene to earliest Eocene that may be in part due to a monographic effect. An increasing rate of evolution of new diatom species between ∼ 46 and 43 Ma and after ∼ 40 Ma coincides respectively with the widespread expansion of diatom deposition in the Atlantic and with an increased pole-to-equator thermal gradient that witnessed the expansion of diatoms in high latitude oceans and coastal upwelling settings. Abstract Copyright (2015) Elsevier, B.V.
Year of Publication: 2015
Research Program: DSDP Deep Sea Drilling Project
IODP Integrated Ocean Drilling Program
ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Arctic Ocean; Asia; Atlantic Ocean; Australasia; Baja California; Biostratigraphy; California; Caribbean Sea; Cenozoic; Commonwealth of Independent States; Deep Sea Drilling Project; Diatoms; Drake Passage; Eocene; Foraminifera; Global; Gulf of Mexico; Indian Ocean; Integrated Ocean Drilling Program; Invertebrata; Kamchatka Peninsula; Mexico; Microfossils; Middle Eocene; Middle Eocene Climatic Optimum; Nannofossils; New Zealand; North Atlantic; Norwegian Sea; Ocean Drilling Program; Pacific Ocean; Paleo-oceanography; Paleocirculation; Paleoclimatology; Paleogene; Peru; Planktonic taxa; Plantae; Protista; Radiolaria; Review; Russian Federation; Russian Pacific region; Silicoflagellata; South America; Tertiary; United States; World ocean
Record ID: 2015036139
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands

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