Masuda, Harue; Tanaka, Hiroaki; Gamo, Toshitaka; Soh, Wonn; Taira, Asahiko (1993): Mineralogy and major-element chemistry of volcanic ash of ODP Site 131-808 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.785150, Supplement to: Masuda, H et al. (1993): Major-element chemistry and alteration mineralogy of volcanic ash, Site 808 in the Nankai Trough. In: Hill, IA; Taira, A; Firth, JV; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 131, 175-183, https://doi.org/10.2973/odp.proc.sr.131.118.1993
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Abstract:
Mineralogical and major-element compositions of 72 samples of volcanic ash, recovered from Site 808 at Nankai Trough during Leg 131, were analyzed in relation to the early diagenetic alteration. Alteration products are first observed at the following depths: smectite, 200 mbsf; clinoptilolite, 646 mbsf; and analcite, 810 mbsf.
Glass decomposition dominates over authigenic mineral formation between 200 and 550 mbsf in the sediment column, whereas mineral formation becomes dominant below 550 mbsf. Based on the X-ray diffraction patterns, a broad and asymmetric peak of 15A suggests a presence of illite/smectite (I/S) mixed-layered minerals in a sample from 646 mbsf. I/S mixed-layered mineral formation, however, rarely occurs even at the bottom of the sediment column (1290 mbsf) at 120° C. This is possibly because zeolite (especially clinoptilolite) formed in the ash interferes with illite formation in the smectite.
The formation of alteration minerals affects the major-element chemistry of the ash and the interstitial waters. H4SiO4 concentrations in interstitial waters increase during glass decomposition and decrease with smectite and clinoptilolite formation. K is removed from interstitial water into smectite and/or clinoptilolite. Mg is fixed into smectite (and/or chlorite).
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 32.351933 * Median Longitude: 134.944000 * South-bound Latitude: 32.351400 * West-bound Longitude: 134.943600 * North-bound Latitude: 32.352800 * East-bound Longitude: 134.944400
Date/Time Start: 1990-04-04T22:30:00 * Date/Time End: 1990-05-02T14:40:00
Event(s):
131-808A * Latitude: 32.352000 * Longitude: 134.944400 * Date/Time Start: 1990-04-04T22:30:00 * Date/Time End: 1990-04-06T15:45:00 * Elevation: -4687.0 m * Penetration: 111.4 m * Recovery: 88.68 m * Location: Philippine Sea * Campaign: Leg131 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 13 cores; 111.4 m cored; 0 m drilled; 79.6 % recovery
131-808B * Latitude: 32.351400 * Longitude: 134.943600 * Date/Time Start: 1990-04-06T15:45:00 * Date/Time End: 1990-04-16T04:00:00 * Elevation: -4685.0 m * Penetration: 358.8 m * Recovery: 59.71 m * Location: Philippine Sea * Campaign: Leg131 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 28 cores; 247.8 m cored; 0 m drilled; 24.1 % recovery
131-808C * Latitude: 32.352800 * Longitude: 134.944300 * Date/Time Start: 1990-04-16T04:00:00 * Date/Time End: 1990-05-02T14:40:00 * Elevation: -4686.0 m * Penetration: 1327 m * Recovery: 572.43 m * Location: Philippine Sea * Campaign: Leg131 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 108 cores; 1028.5 m cored; 0 m drilled; 55.7 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Masuda, H; Tanaka, H; Gamo, T et al. (1993): (Table 2) Major element composition of volcanic ash from ODP Site 131-808. https://doi.org/10.1594/PANGAEA.785149
- Masuda, H; Tanaka, H; Gamo, T et al. (1993): (Table 1) Peak intensities of minerals in volcanic ash from ODP Site 131-808. https://doi.org/10.1594/PANGAEA.785148