Balsam, William L; Deaton, Bobby C (1996): (Table 2) Weight percent organic carbon from ODP Site 138-847 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.758957, Supplement to: Balsam, WL; Deaton, BC (1996): Determining the composition of late Quaternary marine sediments from NUV, VIS, and NIR diffuse reflectance spectra. Marine Geology, 134(1-2), 31-55, https://doi.org/10.1016/0025-3227(96)00037-0
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Abstract:
As the length of marine cores increases and sampling intervals decrease, the need for rapid and inexpensive means of determining sediment composition has become apparent. In this study we examine one potentially useful technique for assessing compositional changes in marine cores, diffuse reflectance spectrophotometry. We examined near-ultraviolet, visible, and near-infrared reflectance spectra from five data sets. Each data set consists of calibration samples and test samples. The calibration samples' spectra were related to a sediment component using multiple linear regression. The resulting regression or calibration equations were then evaluated using the test samples. Calibration equations were written relating spectra to several sediment components incduding carbonate (Atlantic and east Pacific Rise ODP Site 847), organic carbon content (Atlantic and east Pacific Rise), and opal content (east Pacific Rise). The correlation coefficients for the regression equations ranged from a high of 0.99 for carbonate and opal at ODP Site 847 to a low of 0.97 for Atlantic carbonate indicating that spectral variations are highly correlated to sediment composition. All of the equations include a substantial number of variables from shorter visible and longer near ultraviolet wavelengths suggesting that these wavelengths are especially important for devices designed specifically to scan marine cores. Although equations for estimating organic and carbonate content appear independent of other sediment components, the opal equation is strongly dependent on carbonate content indicating that opal concentration is correlated to carbonate content.
Tests of the calibration equations indicated that all our equations reasonably estimate the pattern of changes, either down core or in surface sediments. Where our spectral estimates have difficulty is with absolute values, frequently over or underestimating observed values by a substantial amount. Within these limitations diffuse reflectance spectrophotometry can be a useful tool for characterizing marine cores and as our understanding of the relationship between spectra and mineralogy improves so will estimates of absolute values.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 0.193080 * Median Longitude: -95.320057 * South-bound Latitude: 0.192950 * West-bound Longitude: -95.320450 * North-bound Latitude: 0.193210 * East-bound Longitude: -95.319810
Date/Time Start: 1991-05-28T06:50:00 * Date/Time End: 1991-05-31T05:25:00
Minimum Elevation: -3335.2 m * Maximum Elevation: -3334.3 m
Event(s):
138-847B * Latitude: 0.193210 * Longitude: -95.320450 * Date/Time Start: 1991-05-28T06:50:00 * Date/Time End: 1991-05-29T18:40:00 * Elevation: -3334.3 m * Penetration: 247 m * Recovery: 242.19 m * Location: North Pacific Ocean * Campaign: Leg138 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 27 cores; 247 m cored; 0 m drilled; 98.1 % recovery
138-847C * Latitude: 0.193080 * Longitude: -95.319810 * Date/Time Start: 1991-05-29T18:40:00 * Date/Time End: 1991-05-30T15:50:00 * Elevation: -3334.3 m * Penetration: 232.3 m * Recovery: 225.71 m * Location: North Pacific Ocean * Campaign: Leg138 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 25 cores; 230.3 m cored; 0 m drilled; 98 % recovery
138-847D * Latitude: 0.192950 * Longitude: -95.319910 * Date/Time Start: 1991-05-30T13:50:00 * Date/Time End: 1991-05-31T05:25:00 * Elevation: -3335.2 m * Penetration: 130.1 m * Recovery: 133.57 m * Location: North Pacific Ocean * Campaign: Leg138 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 14 cores; 130.1 m cored; 0 m drilled; 102.7 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Balsam, William L | DSDP/ODP/IODP sample designation | ||
| 3 | Carbon, organic, total | TOC | % | Balsam, William L |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
212 data points