Ocean Drilling Program; Leg 199 scientific prospectus; Paleogene equatorial transect

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Author(s): Lyle, Mitchell W.; Wilson, Paul A.; Baldauf, Jack; Escutia, Carlota
Author Affiliation(s): Primary:
Boise State University, Center for Geophysical Investigation of the Shallow Subsurface, Boise, ID, United States
Southampton Oceanography Centre, United Kingdom
Ocean Drilling Program, United States
Source: Scientific Prospectus, Vol.199, 88p. Publisher: Ocean Drilling Program, Texas A&M University, College Station, TX, United States. ISSN: 1058-1448
Note: In English. The reports in this series become obsolete after a cruise sails and will not be distributed. 42 refs.Scientific Prospectus No. 99
Summary: The Paleogene Equatorial transect (Leg 199, Fig. 1, Table 1) will study the evolution of the equatorial Pacific current and wind system as the Earth went from maximum Cenozoic warmth to initial Antarctic glaciations. The drilling program will be primarily devoted to a transect along 56- to 57-Ma crust, old enough to capture the late Paleocene thermal maximum event in the basal, more carbonate-rich sediments. One drill site (Site PAT-8C) will also be drilled on 40 Ma crust to collect a near-equatorial sediment sequence from the middle Eocene through the late Eocene transition to glacial conditions in Antarctica. If the plate tectonic model we used for paleopositions is approximately correct, Site PAT-8C is at the equator at 40 Ma. Because the Pacific plate drifts north with time out of the high productivity equatorial region, Paleogene equatorial sediments are overlain by a thin Neogene section of red clays. The youngest biogenic sediments to be drilled will be early Miocene in age. The lack of Neogene sedimentation minimizes burial diagenesis; essentially the entire Paleogene sediment section should be recoverable by advanced piston coring. The Leg 199 transect extends from a paleolatitude of about 11°N to about 5°S and encompasses anomalously thick early Eocene sediments deposited as much as 8° north of the Paleocene equator. The transect will collect continuous sediment sequences to document the evolution of the equatorial current system, equatorial surface-water and deep-water temperature variations, wind patterns, and productivity in the late Paleocene and early Eocene. In addition, one site will specifically be drilled to study the changes in equatorial circulation associated with the transition from the late Eocene to the early Oligocene to the ice-house world.
Year of Publication: 2001
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Biostratigraphy; Cenozoic; Chronostratigraphy; Cores; Equatorial Pacific; Hydrothermal conditions; Leg 199; Lithostratigraphy; Ocean Drilling Program; Ocean floors; Pacific Ocean; Paleo-oceanography; Paleoclimatology; Paleogene; Paleogeography; Paleomagnetism; Plate tectonics; Reconstruction; Sedimentary rocks; Seismic stratigraphy; Tertiary
Coordinates: N074500 N260500 W1350000 W1480000
Record ID: 2007086569
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