Nicolo, Micah J. and Dickens, Gerald (2004): Southern Hemisphere terrigenous component flux and composition across the Paleocene-Eocene transition

Leg/Site/Hole:
ODP 121
ODP 122
ODP 121 752
ODP 122 762
Identifier:
2004-063802
georefid

Creator:
Nicolo, Micah J.
Rice University, Earth Science, Houston, TX, United States
author

Dickens, Gerald
author

Identification:
Southern Hemisphere terrigenous component flux and composition across the Paleocene-Eocene transition
2004
In: Anonymous, Geological Society of America, South-Central Section, 38th annual meeting
Geological Society of America (GSA), Boulder, CO, United States
36
1
4
The Paleocene and Eocene epochs represent an interval of both rapid and long-term global climate change. In this regard, early Paleogene carbon isotope records show a characteristic sequence of large amplitude changes between ca. 60 and 50 Ma (e.g., Zachos et al., 2001). These delta (super 13) C perturbations include an extreme high in the late Paleocene, a pronounced negative carbon isotope excursion (CIE) across the Paleocene/Eocene Thermal Maximum (PETM), and a prominent low at the early Eocene Climatic Optimum (EECO). The PETM is a particularly interesting event because the large ( approximately 3 per mil) and rapid (<10 k.y.) negative delta (super 13) C excursion likely reflects a massive input of carbon somewhat analogous to current anthropogenic inputs (Dickens, 1999). Although the responses of atmospheric and terrestrial systems to these fluctuations in the mass and dynamics of the global carbon cycle are critical to understanding the systemic consequences and potential feedbacks to such perturbations, they remain outstanding and largely open issues. In fact, there are remarkably few good Paleogene records of eolian or continental discharge across key time intervals of interest (e.g., Janecek and Rea, 1983; Hovan and Rea, 1992; Robert and Kennett, 1992; Schmitz et al., 2001; Crouch et al., 2003). Particularly, while studies of the flux of eolian material have depicted a less intense atmospheric circulatory system during periods of increased warmth, they have been limited to sites in the lower approximately 30 degrees of latitude, and so offer little insight into atmospheric circulation and intensity above 30 degrees of latitude (Janecek and Rea, 1983; Hovan and Rea, 1992). We present terrigenous component mass accumulation rate (MAR), elemental analysis (ICP-AES), grain-size, and mineralogy (XRD) data from Southern Hemisphere Ocean Drilling Program Sites 762 (Indian Ocean, Exmouth Plateau) and 752 (Indian Ocean, Broken Ridge) in order to characterize the terrigenous component composition and flux in response to periods of global climate change.
English
Coverage:Geographic coordinates:
North:-19.5314
West:93.3439East: 112.1515
South:-30.5329

Stratigraphy; Broken Ridge; C-13/C-12; carbon; carbon cycle; Cenozoic; climate change; Eocene; Exmouth Plateau; geochemical cycle; grain size; ICP mass spectra; Indian Ocean; isotope ratios; isotopes; Leg 121; Leg 122; mass spectra; mineral composition; Ocean Drilling Program; ODP Site 752; ODP Site 762; Paleocene; paleoclimatology; Paleogene; spectra; stable isotopes; stratigraphic boundary; terrigenous materials; Tertiary; X-ray diffraction data;

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