Mineral and chemical composition of hydrothermally altered rocks and sediments from the Middle Valley, ODP Leg 139 data, supplement to: Stakes, Debra S; Schiffman, Peter (1999): Hydrothermal alteration within the basement of the sedimented ridge environment of Middle Valley, northern Juan de Fuca Ridge. Geological Society of America Bulletin, 111(9), 1294-1314

Debra S Stakes & Peter Schiffman
The Middle Valley segment at the northern end of the Juan de Fuca Ridge is a deep extensional rift blanketed with 200-500 m of Pleistocene turbiditic sediment. Sites 857 and 858 were drilled during Ocean Drilling Program Leg 139 to determine whether these two sites were hydrologically linked end members of an active hydrothermal circulation system. Site 858 was placed in an area of active hydrothermal discharge with fluids up to 270°C venting through anhydrite-bearing...
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