Deciphering the palaeoecology of late Pliocene and early Pleistocene dinoflagellate cysts

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doi: 10.1016/j.palaeo.2011.04.020
Author(s): De Schepper, Stijn; Fischer, Eva I.; Groeneveld, Jeroen; Head, Martin J.; Matthiessen, Jens
Author Affiliation(s): Primary:
University Bremen, Geosciences Department, Bremen, Germany
Other:
University of Leicester, United Kingdom
University of Derby, United Kingdom
British Geological Survey, United Kingdom
Brock University, Canada
Alfred Wegener Institute, Germany
Volume Title: Climate and seasonality in a Pliocene warm world
Volume Author(s): Salzmann, Ulrich, editor; Williams, Mark; Johnson, Andrew L. A.; Kender, Sev; Zalaziewicz, Jan
Source: Climate and seasonality in a Pliocene warm world, edited by Ulrich Salzmann, Mark Williams, Andrew L. A. Johnson, Sev Kender and Jan Zalaziewicz. Palaeogeography, Palaeoclimatology, Palaeoecology, 309(1-2), p.17-32. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 CODEN: PPPYAB
Note: In English. Includes appendices. 103 refs.; illus., incl. strat. col., 1 table, sketch map
Summary: In an attempt to document the paleoecological affinities of individual extant and extinct dinoflagellate cysts, late Pliocene and early Pleistocene dinoflagellate cyst assemblages have been compared with geochemical data from the same samples. Mg/Ca ratios of Globigerina bulloides were measured to estimate the spring-summer sea-surface temperatures from four North Atlantic IODP/DSDP sites. Currently, our Pliocene-Pleistocene database contains 204 dinoflagellate cyst samples calibrated to geochemical data. This palaeo-database is compared with modern North Atlantic and global datasets. The focus lies in the quantitative relationship between Mg/Ca-based (i.e. spring-summer) sea-surface temperatures (SSTMg/Ca) and dinoflagellate cyst distributions. In general, extant species are shown to have comparable spring-summer SST ranges in the past (SSTMg/Ca) and today (SST from World Ocean Atlas 2005, Locarnini et al., 2006), demonstrating that our new approach is valid for inferring spring-summer SST ranges for extinct species. For example, Habibacysta tectata represents SSTMg/Ca values between 10 and 15°C when it exceeds 30% of the assemblage, and Invertocysta lacrymosa exceeds 15% when SSTMg/Ca values are between 18.6 and 23.5°C. However, comparing Pliocene and Pleistocene SSTMg/Ca values with present day summer values for the extant Impagidinium pallidum suggests a greater tolerance of higher temperatures in the past. This species occupies more than 5% of the assemblage at SSTMg/Ca values of 11.6-17.9°C in the Pliocene and Pleistocene, whereas present day summer SSTs are around -1.7 to 6.9°C. This observation questions the value of Impagidinium pallidum as reliable indicator of cold waters in older deposits, and may explain its bipolar distribution. Abstract Copyright (2011) Elsevier, B.V.
Year of Publication: 2011
Research Program: DSDP Deep Sea Drilling Project
IODP Integrated Ocean Drilling Program
IPOD International Phase of Ocean Drilling
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Alkaline earth metals; Assemblages; Atlantic Ocean; Biochemistry; Calcium; Calibration; Cenozoic; DSDP Site 603; DSDP Site 610; Data bases; Data processing; Deep Sea Drilling Project; Dinoflagellata; Expedition 303; Expedition 306; Expeditions 303/306; Extinct taxa; Floral list; Foraminifera; Geochemistry; Globigerina; Globigerina bulloides; Globigerinacea; Globigerinidae; IODP Site U1308; IODP Site U1313; IPOD; Impagidinium; Integrated Ocean Drilling Program; Invertebrata; Leg 94; Living taxa; Lower Pleistocene; Magnesium; Metals; Mg/Ca; Microfossils; Mid-Atlantic Ridge; Modern analogs; Neogene; North Atlantic; Northeast Atlantic; Paleoecology; Palynomorphs; Pleistocene; Pliocene; Protista; Quaternary; Rockall Trough; Rotaliina; Sea-surface temperature; Seasonal variations; Tertiary; Transfer functions; Upper Pliocene
Coordinates: N410000 N410000 W0325700 W0325700
N495300 N495300 W0241400 W0241400
N531318 N531329 W0185312 W0185342
N352939 N352940 W0700142 W0700143
Record ID: 2012009539
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands