Relationship between lithology and the neutron absorption cross section (Σ) of samples from Leg 149

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doi: 10.2973/odp.proc.sr.149.236.1996
Author(s): Lofts, Jeremy C.; Harvey, P. K.; Lovell, M. A.; Locke, J.
Author Affiliation(s): Primary:
GeoQuest, Gatwick, United Kingdom
Other:
Rice University, United States
Ocean Drilling Program, United States
Université Pierre et Marie Curie, France
Dalhousie University, Canada
Universidad de Granada, Spain
Université de Nantes, France
Florida State University, United States
Universidade de Aveiro, Portugal
INTERGEOS, Netherlands
University of Waterloo, Canada
Lamont-Doherty Earth Observatory, United States
University of Tokyo, Japan
GEOMAR, Federal Republic of Germany
University of Leicester, United Kingdom
University of Texas at El Paso, United States
University of Michigan, United States
Universität Kiel, Federal Republic of Germany
Cornell University, United States
California State University, United States
Iowa State University, United States
University of Maryland System, United States
Open University, United Kingdom
University of California, United States
Leicester University, United Kingdom
AEA Technology, United Kingdom
Volume Title: Proceedings of the Ocean Drilling Program; scientific results, Iberia abyssal plain; covering Leg 149 of the cruises of the Drilling Vessel JOIDES Resolution; Balboa Harbor, Panama, to Lisbon, Portugal; sites 897-901, 10 March-25 May 1993
Volume Author(s): Whitmarsh, Robert B.; Sawyer, Dale S.; Klaus, Adam; Beslier, Marie-Odile; Collins, Eric S.; Comas, María Carmen; Cornen, Guy; de Kaenel, Eric; Pinheiro, Luis de Menezes; Gervais, Elisabeth; Gibson, Ian L.; Harry, Dennis L.; Hobart, Michael A.; Kanamatsu, Toshiya; Krawcyzk, Charlotte M.; Liu, Li; Lofts, Jeremy C.; Marsaglia, Kathleen M.; Meyers, Philip A.; Milkert, Doris; Milliken, Kitty L.; Morgan, Julia K.; Ramirez, Pedro; Seifert, Karl E.; Shaw, Timothy J.; Wilson, Chris; Yin, Chuan; Zhao, Xixi
Source: Proceedings of the Ocean Drilling Program; scientific results, Iberia abyssal plain; covering Leg 149 of the cruises of the Drilling Vessel JOIDES Resolution; Balboa Harbor, Panama, to Lisbon, Portugal; sites 897-901, 10 March-25 May 1993, Robert B. Whitmarsh, Dale S. Sawyer, Adam Klaus, Marie-Odile Beslier, Eric S. Collins, María Carmen Comas, Guy Cornen, Eric de Kaenel, Luis de Menezes Pinheiro, Elisabeth Gervais, Ian L. Gibson, Dennis L. Harry, Michael A. Hobart, Toshiya Kanamatsu, Charlotte M. Krawcyzk, Li Liu, Jeremy C. Lofts, Kathleen M. Marsaglia, Philip A. Meyers, Doris Milkert, Kitty L. Milliken, Julia K. Morgan, Pedro Ramirez, Karl E. Seifert, Timothy J. Shaw, Chris Wilson, Chuan Yin and Xixi Zhao. Proceedings of the Ocean Drilling Program, Scientific Results, Vol.149, p.595-599. Publisher: Texas A&M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 0884-5891
Note: In English. 2 refs.; illus., incl. 3 tables
Summary: The neutron absorption cross section (Σ of a sample is a measure of the moderating power of the sample in response to its bombardment by neutrons. This physical property is measured automatically by the geochemical logging tool (GLT) and is used in the subsequent land-based processing of the GLT log data. This contribution reports part of a project to measure accurately the of lithologies commonly drilled in the Ocean Drilling Program for both lithological characterization and the calibration and modeling of the nuclear measurements. Σ was measured on 13 samples obtained during Leg 149. These samples, from Holes 897C, 899B, and 900A, were chosen to include a range of both sediment and basement lithologies. Measurements of Σ on two altered basalts from Hole 900A gave an average of 0.00688±0.00014 cm2/g. These figures are higher than, but still generally similar to, values obtained on basalts from Hole 896A (Leg 148) in the East Equatorial Pacific, which suggests that oceanic basalts could be characterized by a reasonably consistent range of Σ (0.0055±0.00011 to 0.0075±0.00015 cm2/g). Three serpentinized peridotites and eight sediment samples measured gave higher values of Σ, averaging 0.01217±0.00025 and 0.01478±0.00030 cm2/g, respectively. Comparison of the measured values of Σ with estimates calculated from the routine chemical analyses of the samples confirms that the use of calculated Σ values is unreliable unless the chemical analysis is particularly complete.
Year of Publication: 1996
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; Atlantic Ocean; Chemical composition; Concentration; Europe; Geochemical logging; Iberian Peninsula; Iberian abyssal plain; Leg 149; Lithofacies; Major elements; Neutron probe data; North Atlantic; Northeast Atlantic; ODP Site 899; ODP Site 900; Ocean Drilling Program; Southern Europe; Trace elements; Well-logging
Coordinates: N404622 N404622 W0121604 W0121604
N404059 N404059 W0113616 W0113616
Record ID: 2007088118
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