A magnetostratigraphic calibration of middle Miocene through Pliocene dinoflagellate cyst and acritarch events in the Iceland Sea (Ocean Drilling Program Hole 907A)

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doi: 10.1016/j.revpalbo.2012.08.006
Author(s): Schreck, Michael; Matthiessen, Jens; Head, Martin J.
Author Affiliation(s): Primary:
Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany
Other:
Brock University, Canada
Volume Title: Review of Palaeobotany and Palynology
Source: Review of Palaeobotany and Palynology, Vol.187, p.66-94. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0034-6667 CODEN: RPPYAX
Note: In English. Includes appendices. 138 refs.; illus., incl. 4 plates, 1 table, sketch map
Summary: A detailed dinoflagellate cyst investigation of the almost continuous Middle Miocene through Pliocene of Ocean Drilling Program Hole 907A in the Iceland Sea has been conducted at 100-kyr resolution. The investigated section is well constrained by magnetostratigraphy, providing for the first time an independent temporal control on a succession of northern high-latitude dinoflagellate cyst bioevents. Based on the highest/lowest occurrences (HO/LO) and highest common occurrence (HCO) of 20 dinoflagellate cyst taxa and one acritarch species, 26 bioevents have been defined and compared with those recorded at selected DSDP, ODP, and IODP sites from the North Atlantic and contiguous seas, and in outcrops and boreholes from the onshore and offshore eastern U.S.A., and the North Sea and Mediterranean basins. Comparisons reveal near-synchronous HOs of the dinoflagellate cysts Batiacasphaera micropapillata (3.8-3.4 Ma, mid-Pliocene) and Reticulatosphaera actinocoronata (4.8-4.2 Ma, Lower Pliocene) across the Nordic Seas and North Atlantic, highlighting their value on a supraregional scale. This probably applies also to Hystrichosphaeropsis obscura (upper Tortonian), when excluding ODP Hole 907A where its sporadic upper stratigraphic range presumably relates to cooling in the early Tortonian. Over a broader time span within the upper Tortonian, the HO of Operculodinium piaseckii likely also permits correlation across the Nordic Seas and North Atlantic, and the HO of Labyrinthodinium truncatum appears useful in the Labrador and Nordic Seas. Biostratigraphic markers useful for regional rather than supraregional correlation are the HOs of Batiacasphaera hirsuta (c. 8.4 Ma, upper Tortonian) and Unipontidinium aquaeductus (c. 13.6-13.9 Ma, upper Langhian), the HCO of the acritarch Decahedrella martinheadii (c. 6.7-6.3 Ma, Messinian), and possibly the LO of Cerebrocysta irregulare sp. nov. (c. 13.8 Ma, uppermost Langhian) across the Nordic Seas. Since Habibacysta tectata, B. micropapillata, R. actinocoronata and D. martinheadii have been observed in the Arctic Ocean, they are potentially useful for high latitude correlations in the polar domain. The LOs of Habibacysta tectata and Unipontidinium aquaeductus suggest a mid- to late Langhian age (15.1-13.7 Ma) for deposits at the base of Hole 907A, thus providing new constraints on the age of basalts at the base of ODP Hole 907A. The stratigraphically important dinoflagellate cysts Cerebrocysta irregulare sp. nov., and Impagidinium elongatum sp. nov. are formally described. Abstract Copyright (2012) Elsevier, B.V.
Year of Publication: 2012
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Absolute age; Acritarchs; Arctic Ocean; Assemblages; Atlantic Ocean; Biostratigraphy; Biozones; Calibration; Cenozoic; Cerebrocysta irregulare; Cores; Description; Dinoflagellata; Europe; Event stratigraphy; Iceland; Iceland Sea; Icelandic Plateau; Impagidinium elongatum; Leg 151; Magnetostratigraphy; Microfossils; Miocene; Neogene; New taxa; North Atlantic; Norwegian Sea; ODP Site 907; Ocean Drilling Program; Palynomorphs; Pliocene; Range; SEM data; Tertiary; Western Europe
Coordinates: N691459 N691459 W0124154 W0124154
Record ID: 2014008978
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands