Fine tuning the chronostratigraphic record; integrated upper Paleocene-lower Eocene chemobiostratigraphic correlations

Author(s): Aubry, Marie-Pierre; Berggren, William A.; Sinha, Ashish; Stott, Lowell
Author Affiliation(s): Primary:
Université Montpellier I, ISEM, Montpellier, France
Other:
Woods Hole Oceanographic Institution, United States
University of Southern California, United States
Volume Title: AAPG international conference and exhibition; abstracts
Source: AAPG Bulletin, 80(8), p.1269; AAPG international conference and exhibition, Caracas, Venezuela, Sept. 8-11, 1996. Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States. ISSN: 0149-1423 CODEN: AABUD2
Note: In English
Summary: Based on calcareous microfossil stratigraphy and chemostratigraphy (d13C isotopes) at three oceanic sites (DSDP Sites 548, 550 and ODP Site 690) we have established an upper Paleocene-lower Eocene composite reference section for integrated chemobiostratigraphy and propose a six-fold biostratigraphic and a seven-fold chemostratigraphic subdivision of this interval. Tied to the GPTS, the integrated biochemostratigraphic framework provides a very high chronologic resolution (approx. 20,000 yrs) for Chron C24r. Integrated magneto-chemo-biostratigraphic correlations at several DSDP/ODP sites in the Atlantic, Pacific and Indian Oceans reveal the widespread occurrence of unconformities near the Paleocene/Eocene boundary. Our chemo-biostratigraphic framework allows precise estimate of the duration of their associated hiatus and of the ages of the unconformable surfaces. We present maps comparing the temporal (late Paleocene-early Eocene) significance of several upper Paleocene-lower Eocene stratigraphic sections in the Atlantic, Pacific and Tethyan realms. We compare this record to the recently revised sequence stratigraphic framework of Vail et al., and discuss its paleoceanographic versus tectonic significance. Regardless of the mechanism(s) involved in the formation of the late Paleocene-early Eocene hiatuses, this study emphasizes (1) the strength of integrated chemobiostratigraphic correlations for the Paleogene, and (2) the fact that fine tuning of the chronostratigraphic record necessitates rigorous analysis of sections and may require the establishment of composite reference sections.
Year of Publication: 1996
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Antarctic Ocean; Atlantic Ocean; Biostratigraphy; C-13/C-12; Carbon; Cenozoic; Chemostratigraphy; Correlation; DSDP Site 548; DSDP Site 550; Deep Sea Drilling Project; Eocene; Goban Spur; IPOD; Indian Ocean; Isotope ratios; Isotopes; Leg 113; Leg 80; Lower Eocene; Magnetostratigraphy; Mapping; Mechanism; North Atlantic; ODP Site 690; Ocean Drilling Program; Pacific Ocean; Paleocene; Paleogene; Remote sensing; Sequence stratigraphy; South America; Stable isotopes; Stratigraphic boundary; Tertiary; Tethys; Unconformities; Upper Paleocene; Venezuela
Coordinates: N485456 N485459 W0120950 W0120951
N483054 N483055 W0132622 W0132623
S650938 S650937 E0011218 E0011218
Record ID: 1996071942
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States