TY - JOUR
T1 - Some patterns of planktic foraminiferal assemblage turnover at the Cretaceous-Tertiary boundary
AU - D'Hondt, Steven
AU - Keller, Gerta
N1 - Funding Information:
We thank C. Benjamini and M. Carpenter for expert help and enjoyable company in collecting the Ben Gurion section, T. Bralower for unpublished Site 528 nannofossil data, M. Debiche for paleolatitude calculations, T. Herbert for paleodepth calculations and R. Olsson for fruitful discussion. C. Perry initially analyzed the faunal composition of some of the Ben Gurion samples as part of a Princeton University senior thesis. M. Carpenter and C. Perry measured the carbonate content of the Ben Gurion samples. W. Berggren provided unpublished taxonomic notes. A. D'Agostino of the DSDP Leg 86 shipboard scientific party provided many processed samples from Sites 577 and 577A. Site 47.2, 528, 577 and 577A samples were provided by the Ocean Drilling Project. Travel funds used in collections of the Ben Gurion sequence were provided by a Sigma Xi Grant-in-Aid, U.S.-Israel Binational NSF grant 86-00110 and National Geographic Grant 3667-87. This study was supported in part by the Princeton University Tuttle Fund and by NSF Grant OCE-8811732 to G. Keller. M. Leckie and J. Lipps provided comments which greatly aided the revision of this manuscript.
PY - 1991/3
Y1 - 1991/3
N2 - Three uppermost Cretaceous through basal Paleocene stratigraphic sequences are examined for planktic foraminiferal assemblage stability and temporal succession patterns. These sequences are at mid-latitude South Atlantic DSDP Site 528, then-equatorial Pacific DSDP Site 577 and the Tethyan shelf Ben Gurion section of the Negev, Israel. In order to better estimate biogeographic patterns and habitat preferences, the results of these analyses are compared to previous Cretaceous biogeographic studies and to previous analyses of Cretaceous-Tertiary (K/T) boundary shelf and epicontinental sections. Results indicate that immediately following the K/T boundary, the examined epicontinental and open-ocean sites were exploited primarily by previously epicontinental planktic foraminiferal assemblages. This pattern of K/T boundary assemblage dominance suggests the geologically instantaneous break-down of Late Cretaceous epicontinental and open-ocean biogeographic provincialization. This shift in open-ocean foraminiferal assemblages is not consistent with models of non-selective K/T boundary extinctions, but is consistent with models of extinction resistence and offshore expansion of near-shore taxa. The re-establishment of stable biogeographic differences between open-ocean and epicontinental planktic foraminiferal assemblages occurs by the basalParvularugoglobigerina eugubina Zone. At open-ocean sites 528 and 577 and the outer-shelf Ben Gurion section, PO andP. eugubina Zone faunal records are marked by a pronounced alternation between Paleocene biserial- and non-biserial-dominated assemblages. This alternation appears strongly damped at shelf and epicontinental sections previously examined. The first appearance and peak magnitude of abundant earliest Paleocene trochospiral forms (Parvularugoglobigerina, Eoglobigerina, Morozovella, Globoconusa) also vary from site to site and may depend closely on levels of primary carbonate productivity.
AB - Three uppermost Cretaceous through basal Paleocene stratigraphic sequences are examined for planktic foraminiferal assemblage stability and temporal succession patterns. These sequences are at mid-latitude South Atlantic DSDP Site 528, then-equatorial Pacific DSDP Site 577 and the Tethyan shelf Ben Gurion section of the Negev, Israel. In order to better estimate biogeographic patterns and habitat preferences, the results of these analyses are compared to previous Cretaceous biogeographic studies and to previous analyses of Cretaceous-Tertiary (K/T) boundary shelf and epicontinental sections. Results indicate that immediately following the K/T boundary, the examined epicontinental and open-ocean sites were exploited primarily by previously epicontinental planktic foraminiferal assemblages. This pattern of K/T boundary assemblage dominance suggests the geologically instantaneous break-down of Late Cretaceous epicontinental and open-ocean biogeographic provincialization. This shift in open-ocean foraminiferal assemblages is not consistent with models of non-selective K/T boundary extinctions, but is consistent with models of extinction resistence and offshore expansion of near-shore taxa. The re-establishment of stable biogeographic differences between open-ocean and epicontinental planktic foraminiferal assemblages occurs by the basalParvularugoglobigerina eugubina Zone. At open-ocean sites 528 and 577 and the outer-shelf Ben Gurion section, PO andP. eugubina Zone faunal records are marked by a pronounced alternation between Paleocene biserial- and non-biserial-dominated assemblages. This alternation appears strongly damped at shelf and epicontinental sections previously examined. The first appearance and peak magnitude of abundant earliest Paleocene trochospiral forms (Parvularugoglobigerina, Eoglobigerina, Morozovella, Globoconusa) also vary from site to site and may depend closely on levels of primary carbonate productivity.
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U2 - 10.1016/0377-8398(91)90024-Z
DO - 10.1016/0377-8398(91)90024-Z
M3 - Article
AN - SCOPUS:0026000113
SN - 0377-8398
VL - 17
SP - 77
EP - 118
JO - Marine Micropaleontology
JF - Marine Micropaleontology
IS - 1-2
ER -