Rebesco, Michele A. (2004): Numerical evaluation of diffuse spectral reflectance data and correlation with core photos, ODP Site 1165, Wild Drift, Cooperation Sea, Antarctica

Leg/Site/Hole:
ODP 188
ODP 188 1165
Identifier:
2004-083824
georefid

10.2973/odp.proc.sr.188.006.2003
doi

Creator:
Rebesco, Michele A.
Istituto Nazionale di Oceanografia e di Geofisico Sperimentale, Trieste, Italy
author

Identification:
Numerical evaluation of diffuse spectral reflectance data and correlation with core photos, ODP Site 1165, Wild Drift, Cooperation Sea, Antarctica
2004
In: Cooper, Alan K., O'Brien, Philip E., Richter, Carl, Barr, Samantha R., Bohaty, Steven M., Claypool, George E., Damuth, John E., Erwin, Patrick S., Florindo, Fabio, Forsberg, Carl Fredrik, Gruetzner, Jens, Handwerger, David A., Januszczak, Nicole N., Kaiko, Alexander, Kryc, Kelly A., Lavelle, Mark, Passchier, Sandra, Pospichal, James J., Quilty, Patrick G., Rebesco, Michele A., Strand, Kari O., Taylor, Brian, Theissen, Kevin M., Warnke, Detlef A., Whalen, Patricia A., Whitehead, Jason M., Williams, Trevor, Proceedings of the Ocean Drilling Program; scientific results; Prydz Bay-Cooperation Sea, Antarctica; glacial history and paleoceanography; covering Leg 188 of the cruises of the drilling vessel JOIDES Resolution; Fremantle, Australia, to Hobart, Tasmania; Sites 1165-1167; 10 January-11 March 2000
Texas A&M University, Ocean Drilling Program, College Station, TX, United States
188
Two main alternating facies were observed at Ocean Drilling Program (ODP) Site 1165, drilled in 3357 m water depth into the Wild Drift (Cooperation Sea, Antarctica): a dark gray, laminated, terrigenous one (interpreted as muddy contourites) and a greenish, homogeneous, biogenic and coarse fraction-bearing one (interpreted as hemipelagic deposits with ice rafted debris [IRD]). These two cyclically alternating facies reflect orbitally driven changes (Milankovitch periodicities) recorded in spectral reflectance, bulk density, and magnetic susceptibility data and opal content changes. Superimposed on these short-term variations, significant uphole changes in average sedimentation rates, total clay content, IRD amount, and mineral composition were interpreted to represent the long-term lower to upper Miocene transition from a temperate climate to a cold-climate glaciation. The analysis of the short-term variations (interpreted to reflect ice sheet expansions controlled by 41-k.y. insolation changes) requires a quite closely spaced sampled record like that provided by the archive multisensor track. Among those, cycles are best described by spectral reflectance data and, in particular, by a parameter calculated as the ratio of the reflectivity in the green color band and the average reflectivity (gray). In this data report a numerical evaluation of spectral reflectance data was performed and substantiated by correlation with core photos to provide an objective description of the color variations within Site 1165 sediments. The resulting color description provides a reference to categorize the available samples in terms of facies and, hence, a framework for further analyses. Moreover, a link between visually described features and numerical series suitable for spectral analyses is provided.
English
Coverage:Geographic coordinates:
North:-64.2200
West:67.1300East: 67.1400
South:-64.2300

Stratigraphy; Antarctica; Cenozoic; Cooperation Sea; cores; correlation; density; depositional environment; glacial environment; glaciomarine environment; ice rafting; Leg 188; lithofacies; lithostratigraphy; magnetic susceptibility; marine environment; marine sediments; Milankovitch theory; Miocene; Neogene; numerical models; Ocean Drilling Program; ODP Site 1165; paleo-oceanography; paleoclimatology; paleomagnetism; photography; Quaternary; reconstruction; reflectance; sediments; spectra; Tertiary;

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