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1.2 Troodos Ophiolite (Hydrothermal-magmatic cycles (Dykes w & without…

- - - - big, some boulsters (elongate)
    - - Glass - fragmental lava rims etc
  - - - Bonninite - much more primitive (subduction onset?)
    - - Older, low-Mg andesite
      - Tholeiitic - subduction related
- - - - fluid/gas pushed upwards & ballooned
      - stimes precipitate out
- - - - Steep slope/unstable
      - Pillows burst ∴ material interacts w seawater & fragments
    - - = hydrated volcanic glass
      - palagonite forms pillow rims
      - why so fresh?
        
        impermeable & crystallised instantly
  - - - Black - silica
      - White - zeolite
      - Green - saladonite (smectite)
    - - Beneath dyke after main spreading ceased
      - vs on-axis, high temp --> epidote
  - - - Thin, light dyke with black glassy rock either side
    - - Hyaloclastite has cooled more @ Z ∴ harder to remelt