To 185 Site 801 Track Line

To 185 Site 801 Seismic Line

Priority: 1
Position: 18°38.52ŽN, 156°21.6ŽE
Water Depth: 5674 m
Sediment Thickness: 460 m
Target Drilling Depth: >850 mbsf
Approved Maximum Penetration: 950 mbsf
Seismic Coverage: MESOPAC II, Line 10 at 0600, 8/26/89

Objectives: The objectives of Site 801 are to:

  1. Characterize the geochemical fluxes and geophysical aging attending the upper oxidative alteration of the oceanic crust in Hole 801C.
  2. Compare igneous compositions, structure, and alteration with other drilled sections of in situ oceanic crust (in particular Hole 504B, contrasting a young site in Pacific crust with the oldest site in Pacific crust).
  3. Help constrain models for seafloor alteration that depend on spreading rate and age (Hole 801C contains the world's oldest oceanic crust drilled to date, which was formed at a fast spreading ridge, so it embodies several end-member characteristics).
  4. Test models for the Jurassic Magnetic "Quiet" Zone.

Drilling Program: RCB

Logging and Downhole Operations: Triple Combo, GLT, FMS/Sonic, ARI, Permeability

Nature of Rock Anticipated: Basaltic pillows, flows, breccia, and possibly dikes (>350 m)

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