Lackschewitz, Klas Sven; Singer, A; Botz, Reiner; Garbe-Schönberg, Dieter; Stoffers, Peter (2000): Granulometry, mineralogy and geochemistry of sediments from ODP Hole 169-1037B and Site 169-1038 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.788708, Supplement to: Lackschewitz, KS et al. (2000): Mineralogy and geochemistry of clay minerals near a hydrothermal site in the Escanaba Trough, Gorda Ridge, northeast Pacific Ocean. In: Zierenberg, RA; Fouquet, Y; Miller, DJ; Normark, WR (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 169, 1-24, https://doi.org/10.2973/odp.proc.sr.169.116.2000
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Abstract:
Central Hill is in the northern part of the Escanaba Trough, which is a sediment-filled rift of southern Gorda Ridge. Central Hill is oriented north-south and is associated with extensive sulfide deposits. Hydrothermal alteration of sediment from Site 1038 was studied through analyses of mineralogy and the chemistry and oxygen isotopic compositions of one nearly pure clay sample. In addition, Site 1037 was drilled to establish the character of the unaltered sedimentary sequence away from the hydrothermal centers of the Northern Escanaba Trough Study Area (NESCA). Mineralogy of the clay-size fraction of turbiditic and hemipelagic sediments of Hole 1037B are predominantly quartz, feldspar, pyroxene, illite, chlorite, and smectite, representing continental-derived material.
Cores from Hole 1038I, located within the area of Central Hill but away from known active vent areas, recovered minor amounts of chlorite/smectite mixed-layer clay in the fine fraction, indicating a low-temperature hydrothermal alteration. The 137.4-m-thick sediment section of Hole 1038G is located in an area of low-temperature venting. The uppermost sample is classified as chlorite/smectite mixed layer, which is underlain by chlorite as the dominant mineral. The lowermost deposits of Hole 1038G are also characterized by chlorite/smectite mixed-layer clay. In comparison to Hole 1038I, the mineralogic sequence of Hole 1038G reflects increased chloritization. Intensely altered sediment is almost completely replaced by hydrothermal chlorite in subsurface sediments of Hole 1038H. Alteration to chlorite is characterized by depletion in Na, K, Ti, Ca, Sr, Cs, and Tl and enrichment in Ba. Further, Eu depletion reflects a high-temperature plagioclase alteration. A chlorite 18O value of 2.6 indicates formation at a temperature of ~190°C. It is concluded that the authigenic chlorite in Hole 1038H formed by an active high-temperature fluid flow in the shallow subsurface.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 40.984271 * Median Longitude: -127.500144 * South-bound Latitude: 40.954970 * West-bound Longitude: -127.515000 * North-bound Latitude: 41.000080 * East-bound Longitude: -127.488080
Date/Time Start: 1996-09-25T08:20:00 * Date/Time End: 1996-10-09T15:30:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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3 datasets
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Datasets listed in this publication series
- Lackschewitz, KS; Singer, A; Botz, R et al. (2000): (Table T1) Bulk sediment granulometry and mineralogy of fine-grained sediments (<2 µm) from ODP Hole 169-1037B. https://doi.org/10.1594/PANGAEA.788705
- Lackschewitz, KS; Singer, A; Botz, R et al. (2000): (Table T2) Mineralogy of unaltered, altered, and strongly altered sediments from ODP Site 169-1038. https://doi.org/10.1594/PANGAEA.788706
- Lackschewitz, KS; Singer, A; Botz, R et al. (2000): (Tables T3, T4) Major and trace element composition of fine-grained sediments (<2 µm) from ODP Hole 169-1038H. https://doi.org/10.1594/PANGAEA.788707