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Morrison, M Ann; Thompson, Robert N (1983): Geochemistry at DSDP Legs 64 and 65 Holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.818114, Supplement to: Morrison, MA; Thompson, RN (1983): Alteration of basalt: Deep Sea Drilling Project Legs 64 and 65. In: Lewis, BTR; Robinson, P; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 65, 643-660, https://doi.org/10.2973/dsdp.proc.65.131.1983

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Abstract:
Evidence for submarine hydrothermal activity along oceanic spreading centers has been accumulated from a large and diverse body of geochemical and geophysical data (e.g., Boström and Peterson, 1966; Wolery and Sleep, 1976; Humphris and G. Thompson, 1978), and the alteration of oceanic rocks by seawater has been the subject of intense study for the last few years. Previous studies of Deep Sea Drilling Project (DSDP) samples have found little evidence of high-ternperature hydrothermal activity in the upper part of the oceanic crust. Instead, most of the alteration described appears to be the result of low-temperature interchange between basalt and seawater under ambient conditions on the seafloor. This type of alteration is most pronounced along fractures and open channelways and involves the growth of smectite, carbonate, and occasionally pyrite and phillipsite. Olivine crystals and interstitial glassy material within the basalts are frequently replaced by smectites and more rarely, carbonate, but the plagioclase feldspars and clinopyroxenes are normally unaffected. The resulting chemical changes usually involve notable increases in H2O, Fe2O3, K2O, Rb, Cs, and U and smaller increases in total iron and Sr. TiO2, Al2O3, P2O5, Nb, Zr, and Y are usually considered to be little affected by alteration (e.g., Bass, 1976; Robinson et al., 1977). Several workers (e.g., Pritchard et al., 1979) have noticed an increase in the degree of alteration with age.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 23.765049 * Median Longitude: -108.959844 * South-bound Latitude: 22.748700 * West-bound Longitude: -111.507500 * North-bound Latitude: 27.096800 * East-bound Longitude: -107.903800
Date/Time Start: 1978-12-02T00:00:00 * Date/Time End: 1979-03-05T00:00:00
Event(s):
64-474A * Latitude: 22.959300 * Longitude: -108.978000 * Date/Time: 1978-12-02T00:00:00 * Elevation: -3022.0 m * Penetration: 626 m * Recovery: 290.1 m * Location: North Pacific/Gulf of California/BASIN * Campaign: Leg64 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 49 cores; 453 m cored; 9.5 m drilled; 64 % 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:
13 datasets

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Datasets listed in this publication series

  1. Morrison, MA; Thompson, RN (1983): (Table 3) Geochemistry of smectites and carbonate at DSDP Hole 64-474A. https://doi.org/10.1594/PANGAEA.818103
  2. Morrison, MA; Thompson, RN (1983): (Table 2) Geochemistry of groundmass plagioclases from DSDP Hole 64-478. https://doi.org/10.1594/PANGAEA.818102
  3. Morrison, MA; Thompson, RN (1983): (Table 1) Geochemistry of smectites and zeolites from DSDP Hole 64-478. https://doi.org/10.1594/PANGAEA.818101
  4. Morrison, MA; Thompson, RN (1983): (Table 6) Geochemistry of carbonates at DSDP Site 65-482. https://doi.org/10.1594/PANGAEA.818106
  5. Morrison, MA; Thompson, RN (1983): (Table 4) Geochemistry of smectites at DSDP Site 65-482. https://doi.org/10.1594/PANGAEA.818104
  6. Morrison, MA; Thompson, RN (1983): (Table 7) Geochemistry of sulfides at DSDP Site 65-482. https://doi.org/10.1594/PANGAEA.818107
  7. Morrison, MA; Thompson, RN (1983): (Table 8) Geochemistry of barites at DSDP Hole 65-482C. https://doi.org/10.1594/PANGAEA.818108
  8. Morrison, MA; Thompson, RN (1983): (Table 5) Comparison between unaltered interstitial glass and associated smectite, DSDP Sample 65-482C-10-1,16-18 both recalculated to 100%. https://doi.org/10.1594/PANGAEA.818105
  9. Morrison, MA; Thompson, RN (1983): (Table 9) Geochemistry of smectites at DSDP Hole 65-483. https://doi.org/10.1594/PANGAEA.818109
  10. Morrison, MA; Thompson, RN (1983): (Table 11) Geochemistry of smectites at DSDP Hole 65-483A. https://doi.org/10.1594/PANGAEA.818111
  11. Morrison, MA; Thompson, RN (1983): (Table 10) Geochemistry of limonite at DSDP Hole 65-483B. https://doi.org/10.1594/PANGAEA.818110
  12. Morrison, MA; Thompson, RN (1983): (Table 12) Geochemistry of basalts at DSDP Legs 64 and 65 Holes. https://doi.org/10.1594/PANGAEA.818112
  13. Morrison, MA; Thompson, RN (1983): (Table 13) Geochemistry of glasses at DSDP Legs 64 and 65 Holes. https://doi.org/10.1594/PANGAEA.818113