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Figure 6

FMS images showing different types of fractures observed within Logging Unit 3 which is believed to be a fault zone. (A) Series of fractures dipping W-SW, at angles ranging from 66° to 75°. (B) Fractures in the deepest section of Logging Unit 3. The fracture at 290.5 mbsf, overlying fragmented material, could be interpreted as a pathway for hydrothermal circulation responsible for an observed decrease in potassium at this depth.

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