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Pertsev, Nikolay N; Boronikhin, V A (1983): Geochemistry at DSDP Hole 69-504B [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.816445, Supplement to: Pertsev, NN; Boronikhin, VA (1983): Alteration zones near veins in basalts from Deep Sea Drilling Project Sites 501/504 and 505, Costa Rica Rift. In: Cann, JR; Langseth, MG; Honnorez, J; Von Herzen, RP; White, SM; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 69, 565-572, https://doi.org/10.2973/dsdp.proc.69.129.1983

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Abstract:
Cores from Deep Sea Drilling Project Holes 501, 504B and 505B have an unusual near-vein zonation in basalts. Megascopically, zonation occurs as differently colored strips and zones whose typical thickness does not exceed 6 to 7 cm. Microscopically, the color of zones depends on variably colored clay minerals which are the products of low-temperature hydrothermal alteration in basalt. These differently colored zones form the so called "oxidative" type of alteration of basalts. Another "background," or, less precisely termed, "non-oxidative," type of alteration in basalts is characterized by large-scale, homogeneous replacement of olivine, and filling of vesicles and cracks by an olive-brown or olive-green clay mineral. The compositions of clay minerals of the "background" type of alteration, as well as the composition of co-existing titanomagnetites, were determined with an electron microprobe. There are sharp maxima in potassium and iron content, and minima in alumina, silica, and magnesia in clay minerals in the colored zones near veins. Coloring of clay and rock-forming minerals by iron hydroxides and a decrease of the amount of titanomagnetite, which apparently was the source of redeposited iron, occur frequently in colored zones. We assume that the large-scale "background" alteration in the basalts occurred under the effect of pore waters slowly penetrating through bottom sediments. Faulting can facilitate access of fresh sea water to basalts; thus above the general homogeneous background arise zones of "oxidative" alteration along fractures in basalts. The main factors controlling these processes are time (age of basalt), grain size, temperature, thickness of sedimentary cover, and heat flow.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 1.227200 * Longitude: -83.730200
Date/Time Start: 1979-10-07T00:00:00 * Date/Time End: 1979-10-07T00:00:00
Event(s):
69-504B * Latitude: 1.227200 * Longitude: -83.730200 * Date/Time: 1979-10-07T00:00:00 * Elevation: -3460.0 m * Penetration: 489 m * Recovery: 262 m * Campaign: Leg69 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
9 datasets

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Datasets listed in this publication series

  1. Pertsev, NN; Boronikhin, VA (1983): (Table 10) Geochemistry of clay minerals of the back-ground basalt at DSDP Hole 69-504B. https://doi.org/10.1594/PANGAEA.816444
  2. Pertsev, NN; Boronikhin, VA (1983): (Table 9) Geochemistry of clay minerals, DSDP Sample 69-504B-3-2,99-101, Piece 188. https://doi.org/10.1594/PANGAEA.816443
  3. Pertsev, NN; Boronikhin, VA (1983): (Table 2) Geochemistry of clay minerals, DSDP Sample 69-504B-13-4,10-12, Piece 802. https://doi.org/10.1594/PANGAEA.816436
  4. Pertsev, NN; Boronikhin, VA (1983): (Table 3) Geochemistry of titanomagnetites, DSDP Sample 69-504B-13-4,10-12, Piece 802. https://doi.org/10.1594/PANGAEA.816437
  5. Pertsev, NN; Boronikhin, VA (1983): (Table 4) Geochemistry of clay minerals, DSDP Sample 69-504B-16-2,34-36, Piece 976. https://doi.org/10.1594/PANGAEA.816438
  6. Pertsev, NN; Boronikhin, VA (1983): (Table 5) Geochemistry of titanomagnetites, DSDP Sample 69-504B-16-2,34-36, Piece 976. https://doi.org/10.1594/PANGAEA.816439
  7. Pertsev, NN; Boronikhin, VA (1983): (Table 6) Geochemistry of clay minerals, DSDP Sample 69-504B-27-1,118-120, Piece 1475. https://doi.org/10.1594/PANGAEA.816440
  8. Pertsev, NN; Boronikhin, VA (1983): (Table 7) Geochemistry of clay minerals, DSDP Sample 69-504B-28-1,110-113, Piece 1498. https://doi.org/10.1594/PANGAEA.816441
  9. Pertsev, NN; Boronikhin, VA (1983): (Table 8) Geochemistry of titanomagnetites, DSDP Sample 69-504B-28-1,110-113, Piece 1498. https://doi.org/10.1594/PANGAEA.816442