Dissolution susceptibility of some Paleogene planktonic Foraminifera from ODP Site 1209 (Shatsky Rise, Pacific Ocean)

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doi: 10.2113/gsjfr.38.4.357
Author(s): Petrizzo, Maria Rose; Leoni, Greta; Speijer, Robert P.; De Bernardi, Bianca; Felletti, Fabrizio
Author Affiliation(s): Primary:
University of Milano, Department of Earth Sciences Ardito Desio, Milan, Italy
Katholieke Universiteit Leuven, Belgium
Volume Title: Journal of Foraminiferal Research
Source: Journal of Foraminiferal Research, 38(4), p.357-371. Publisher: Cushman Foundation for Foraminiferal Research, Ithaca, NY, United States. ISSN: 0096-1191 CODEN: JFARAH
Note: In English. Includes appendix. 74 refs.; illus., incl. strat. col., 3 plates, 1 table, sketch map
Summary: A detailed, quantitative analysis of planktonic foraminiferal composition and shell fragmentation is presented for samples from Ocean Drilling Program Site 1209 (Leg 198, Shatsky Rise, Pacific Ocean) in a stratigraphic interval from the Paleocene/Eocene boundary, which is characterized by enhanced carbonate dissolution, to the base of the middle Eocene where no distinct dissolution layers are recorded. The aims are to evaluate whether the composition of the fossil Paleogene assemblage is representative of the original assemblage and to what extent it is influenced by carbonate dissolution. By comparing the absolute abundances of whole specimens and fragments of the three most common Paleogene genera (Morozovella, Acarinina and Subbotina), it is demonstrated that the percentage of foraminiferal fragments, identified to genus, is helpful in interpreting the paleoenvironment of fossil planktonic foraminiferal assemblages affected by marked carbonate dissolution. In addition, the absolute abundance of whole specimens and fragments of the three Paleogene genera collected at the Paleocene/Eocene boundary and in the Eocene reveal that, contrary to earlier suggestions, the spinose, asymbiotic, deep-dweller Subbotina is less resistant to dissolution than the muricate, symbiont-bearing, surface-dwellers Morozovella and Acarinina. Distinguishing between primary and taphonomic signals in Paleogene planktonic foraminiferal assemblages will be an important challenge to overcome in order to better constrain paleoecologic and paleoclimatic signals of global significance.
Year of Publication: 2008
Research Program: ODP Ocean Drilling Program
Key Words: 10 Paleontology, Invertebrate; 12 Stratigraphy, Historical Geology and Paleoecology; Acarinina; Algae; Biostratigraphy; Cenozoic; Eocene; Foraminifera; Invertebrata; Leg 198; Lithostratigraphy; Lower Eocene; Microfossils; Morozovella; Nannofossils; North Pacific; Northwest Pacific; ODP Site 1209; Ocean Drilling Program; Pacific Ocean; Paleocene; Paleoclimatology; Paleoecology; Paleoenvironment; Paleogene; Pelagic environment; Planktonic taxa; Plantae; Preservation; Protista; Quantitative analysis; Shatsky Rise; Shells; Solution; Statistical analysis; Stratigraphic boundary; Subbotina; Tertiary; Upper Paleocene; West Pacific
Coordinates: N323900 N324000 E1583100 E1583000
Record ID: 2008130716
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Abstract, Copyright, Cushman Foundation for Foraminiferal Research, Reference includes data from GeoScienceWorld, Alexandria, VA, United States