Spectral data from Sites 1165 and 1167 including the HiRISC section from Hole 1165B

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doi: 10.2973/odp.proc.sr.188.003.2003
Author(s): Damuth, John E.; Balsam, William L.
Ocean Drilling Program, Leg 188, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
University of Texas at Arlington, Department of Geology, Arlington, TX, United States
Other:
Australian Geological Survey Organisation, Australia
Ocean Drilling Program, United States
University of Leicester, United Kingdom
University of Nebraska, United States
University of Texas at Arlington, United States
Oxford University, United Kingdom
Istituto Nazionale di Geofisica e Vulcanologia, Italy
Norwegian Polar Institute, Norway
Christan-Albrechts-Universität zu Kiel, Federal Republic of Germany
University of Utah, United States
University of Toronto at Scarborough, Canada
Curtin University of Technology, Australia
Boston University, United States
British Antarctic Survey, United Kingdom
Ohio State University, United States
Florida State University, United States
University of Tasmania, Australia
Istituto Nazionale di Oceanografia e di Geofisico Sperimentale, Italy
University of Oulu, Finland
Jacques Whitford and Associates, Canada
California State University, United States
Lamont-Doherty Earth Observatory, United States
Volume Title: 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
Volume Author(s): 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; Grützner, 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
Source: 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, Alan K. Cooper, Philip E. O'Brien, Carl Richter, Samantha R. Barr, Steven M. Bohaty, George E. Claypool, John E. Damuth, Patrick S. Erwin, Fabio Florindo, Carl Fredrik Forsberg, Jens Grützner, David A. Handwerger, Nicole N. Januszczak, Alexander Kaiko, Kelly A. Kryc, Mark Lavelle, Sandra Passchier, James J. Pospichal, Patrick G. Quilty, Michele A. Rebesco, Kari O. Strand, Brian Taylor, Kevin M. Theissen, Detlef A. Warnke, Patricia A. Whalen, Jason M. Whitehead and Trevor Williams; Ocean Drilling Program, Leg 188, Shipboard Scientific Party, College Station, TX. Proceedings of the Ocean Drilling Program, Scientific Results (CD ROM), Vol.188, 49p. Publisher: Texas A&M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 1096-2514
Note: In English. Data report; includes appendix; available only on CD-ROM in PDF format and on the Web in PDF and HTML. 23 refs.CD-ROM format, ISSN 1096-2514; WWW format, ISSN 1096-7451; illus., incl. 2 tables
Summary: We measured and analyzed near-ultraviolet/visible/near-infrared spectral data from core samples recovered from Ocean Drilling Program Sites 1165 (Wild Drift) and 1167 (Prydz Channel Trough Mouth Fan) using our laboratory-grade spectrophotometer to help determine temporal mineralogical changes downhole. These measurements included closely spaced (∼10 cm) samples for the section from 0 to 54.17 meters below seafloor (mbsf) in Hole 1165B, which is the Pliocene-Pleistocene age interval being studied in detail by the High-Resolution Integrated Stratigraphy Committee (HiRISC). We also determined calcium carbonate content for all samples in this HiRISC interval. The Pleistocene and uppermost Pliocene sediments (0-10 mbsf) show wide carbonate fluctuations ranging from 0 to 37 wt%; however, below 10 mbsf, the carbonate content is generally zero. To examine the major components that contribute to spectral variability in the holes, the first-derivative values for all samples from Sites 1165 and 1167 were assembled into a single matrix and the matrix was then factor analyzed after being subject to a varimax rotation. For Sites 1165 and 1167, factoring first-derivative values from 255 to 745 nm produced the most easily interpretable results, with five factors that explain ∼92.5% of the total variance in the data set. Factor 1 incorporates both goethite and chlorite, meaning that scores for this factor will be high where these two minerals covary. Factor 2 is interpreted as organic matter. Factor 3 appears to be a combination of clay minerals, possibly montmorillonite and illite. Factor 4 is interpreted as the mineral maghemite, a polymorph of hematite. Factor 5 is the mineral hematite. We generated plots of factor scores downhole at Sites 1165 and 1167 to determine trends in temporal changes. At Site 1165 Factor 1 predominates above ∼540 mbsf, Factor 2 is important above ∼280 mbsf, and Factor 3 is high from 25 to 350 mbsf. Factor 4 exhibits two zones of high values from 20 to 50 mbsf and 540 to 750 mbsf. Factor 5 is important from 0 to 95 mbsf. In the HiRISC Section of Hole 1165B (0-54 mbsf), Factors 1 and 2 exhibit high scores through most of the section, with the exception of a low in both factors centered at ∼30 mbsf. Factors 3 and 4 exhibit high values primarily below 30 mbsf, and Factor 5 exhibits higher-frequency variation than the other factors. Despite apparent similarities in their downhole patterns, few of the factors are highly correlated to each other. In Hole 1167A Factor 1 is important only in the top 5 mbsf, whereas Factor 2 is important throughout the entire hole. Factor 3 is important only from 210 to 227 mbsf, Factor 4 exhibits a few high values in the uppermost 30 mbsf, and Factor 5 is most important from 30 to 210 mbsf. Regression of factor scores vs. X-ray diffraction percentage values for the various minerals downhole indicates minor correlations of Factor 1 to pyrite and Factor 2 to hornblende. No other factors exhibited a correlation >0.1 for any of the minerals analyzed.
Year of Publication: 2004
Research Program: ODP Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; Brightness; Calcium carbonate; Density; Experimental studies; Glacial environment; Glaciomarine environment; Grain size; Laboratory studies; Leg 188; Marine environment; Marine sediments; Mineral composition; Near-infrared spectra; ODP Site 1165; ODP Site 1167; Ocean Drilling Program; Prydz Bay; Regression analysis; Sediments; Southern Ocean; Spectra; Statistical analysis; Ultraviolet spectra; X-ray diffraction data
Coordinates: S662400 S662400 E0721800 E0721700
S642300 S642200 E0671400 E0671300
Record ID: 2004083819
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