Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

Mix, Alan C; Harris, Sara E; Janecek, Thomas R (1995): Lithology of ODP Leg 138 holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.807249, Supplement to: Mix, AC et al. (1995): Estimating lithology from nonintrusive reflectance spectra: Leg 138. In: Pisias, NG; Mayer, LA; Janecek, TR; Palmer-Julson, A; van Andel, TH (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 138, 413-427, https://doi.org/10.2973/odp.proc.sr.138.121.1995

Always quote citation above when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

Abstract:
During Leg 138, we measured reflectance spectra in the visible and near-infrared bands (455-945 nm) every few centimeters on split core surfaces from eastern tropical Pacific Ocean sediments. Here, we evaluate predictions of the content of biogenic calcite, biogenic opal, and nonbiogenic sediments from the reflectance spectra. For Sites 844 through 847, which contain a significant nonbiogenic component, reflectance spectra yielded a useful proxy for the percentages of CaCO3 over a wide range of values from nearly 0% to 100%, with root-mean-square (RMS) errors of about 9%. Direct estimates of "nonbiogenic" sediment percentages, approximated by 100 - (CaCO3 + opal), were reasonably successful (RMS error of 10%), however, were incorrect in some intervals. This suggests that mineralogy of the nonbiogenic material changes through time and that further subdivision of this component will be needed for useful estimation from reflectance. For percentages of biogenic opal, calibration equations appear to work well (RMS error of 6%) at concentrations of less than 30%, but for higher opal concentrations, reflectance equations often underestimate the true contents of opal. Improvements in multiparameter lithologic estimates from reflectance spectra may come from (1) expanding the wavelengths measured to better capture unique mineral reflectance bands, and (2) adding the ability to measure diffuse, rather than directional, reflectance to minimize the effects of surface roughness.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 3.407955 * Median Longitude: -92.488750 * South-bound Latitude: -3.094930 * West-bound Longitude: -95.320450 * North-bound Latitude: 9.582500 * East-bound Longitude: -90.480760
Date/Time Start: 1991-05-11T10:24:00 * Date/Time End: 1991-08-09T06:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text — use the following character encoding:

Datasets listed in this publication series

  1. Mix, AC; Harris, SE; Janecek, TR (1995): (Table 3) Measured and estimated CaCO3 content in ODP Leg 138 holes. https://doi.org/10.1594/PANGAEA.807248
  2. Mix, AC; Harris, SE; Janecek, TR (1995): (Table 1) Calbibration set for CaCO3, opal and non-biogenic components of ODP Leg 138 holes. https://doi.org/10.1594/PANGAEA.807245
  3. Mix, AC; Harris, SE; Janecek, TR (1995): (Table 2) Verification set for CaCO3, opal and non-biogenic components of ODP Leg 138 holes. https://doi.org/10.1594/PANGAEA.807246