Neogene Dinoflagellate Distribution in the Eastern Indian Ocean from Leg 123, Site 765

McMinn, Andrew

doi:10.2973/odp.proc.sr.123.120.1992

Cited by 15 publications

(3 citation statements)

References 16 publications

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“…This confirms the tropical to warm-temperate affinities of D. pseudocolligerum as recognized by Head and Westphal (1999) and is consistent with the observed discrepancy in the Nordic Seas, where it disappeared earlier in the colder Iceland Sea (9.1 Ma; mid-Tortonian) than in the more temperate Norwegian Sea (c. 7.6 Ma; late Tortonian). The distribution of this species elsewhere accords with its North Atlantic pattern, as it occurs persistently in the Pliocene of the eastern Indian Ocean (McMinn, 1992) and has an HO in the Upper Pliocene of the northeast Australian margin (McMinn, 1993), but does not range higher than early Middle Miocene in northern Japan (Bujak and Matsuoka, 1986). Although it has a well-defined HO in Hole 907A, the strong climatic control on the distribution of D. pseudocolligerum would seem to hinder its biostratigraphic utility even on a regional scale.…”

Section: Asynchronous Last Appearancesmentioning

confidence: 96%

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

Schreck

Matthießen

Head

2012

Review of Palaeobotany and Palynology

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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.

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