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Kelts, Kerry (1982): Mineralogy and geochemistry at DSDP Leg 64 Holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.819067, Supplement to: Kelts, K (1982): Petrology of hydrothermally metamorphosed sediments at Deep Sea Drilling Site 477, southern Guaymas Basin Rift, Gulf of California. In: Curray, JR; Moore, DG; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 64, 1123-1136, https://doi.org/10.2973/dsdp.proc.64.152.1982

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Abstract:
At DSDP Site 477, late Quaternary diatomaceous muds and delta-derived silty-sand turbidites at 2000 meters water depth have been extensively and progressively altered by a deep-seated heat source beneath a sill. Bulk petrologic and microprobe analyses have identified a crudely zoned paragenesis within 260 meters sub-bottom which ranges from unaltered to slightly altered oozes (0-50 m), anhydrite-dolomite claystones (105-125 m), illite-chlorite-pyrite claystones (125-140 m), chlorite-pyrite-calcite-carbonaceous claystones with traces of K-feldspar, albite, epidote (140-190 m), and chlorite-epidote-quartz-albite-pyrrhotite-sphene sandstone (190-260 m). Several petrologic features suggest rapid processes of ocean floor metamorphism: (1) friable and porous textures, (2) abundant relict grains with overgrowths, (3) idiomorphic habits on epidotes, feldspars, and quartz, and (4) a steep gradient in levels of alteration. Many aspects of this hydrothermal assemblage are similar to hydrothermally metamorphosed sandstones of the Cerro Prieto, Mexico, geothermal area.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 27.215490 * Median Longitude: -111.452780 * South-bound Latitude: 27.030000 * West-bound Longitude: -111.624800 * North-bound Latitude: 27.846000 * East-bound Longitude: -111.398800
Date/Time Start: 1978-12-18T00:00:00 * Date/Time End: 1978-12-29T00:00:00
Event(s):
64-477 * Latitude: 27.030800 * Longitude: -111.400300 * Date/Time: 1978-12-18T00:00:00 * Elevation: -2003.0 m * Penetration: 191 m * Recovery: 50.6 m * Location: North Pacific/Gulf of California/BASIN * Campaign: Leg64 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 21 cores; 172 m cored; 19 m drilled; 29.4 % recovery
64-477A * Latitude: 27.030000 * Longitude: -111.398800 * Date/Time: 1978-12-18T00:00:00 * Elevation: -2003.0 m * Penetration: 267 m * Recovery: 16 m * Location: North Pacific/Gulf of California/BASIN * Campaign: Leg64 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 11 cores; 111 m cored; 9.5 m drilled; 14.4 % recovery
64-478 * Latitude: 27.096800 * Longitude: -111.507500 * Date/Time: 1978-12-24T00:00:00 * Elevation: -1889.0 m * Penetration: 464 m * Recovery: 297.6 m * Location: North Pacific/Gulf of California/CHANNEL * Campaign: Leg64 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 49 cores; 427 m cored; 24 m drilled; 69.7 % 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

  1. Kelts, K (1982): (Table 2) Geochemistry at DSDP Leg 64 Holes. https://doi.org/10.1594/PANGAEA.819066
  2. Kelts, K (1982): (Table 1) Mineralogy at DSDP Site 64-477. https://doi.org/10.1594/PANGAEA.819065