Holes 1190A and 1190B failed to penetrate the length of a joint of pipe before sticking fast, but we were able to extricate the pipe without incident. Hole 1190C penetrated to 17 m before getting stuck, so after freeing the pipe, we decided to terminate operations at this site for the time being, holding in abeyance the opportunity to return at a later time. A parted coring wireline delayed tripping the pipe. Several types of intensely altered rock were intersected, mostly with recognizable parents. The latter include perlitic-textured and vesicular lavas and likely volcaniclastic sediment.
Hydrothermal breccias abound.
Silica is largely cristobalite with minor to subordinate quartz. A thin, laminated unit at 136.9 to 137.8 mbsf, interpreted as sedimentary, marks a change in alteration. Below the sedimentary unit quartz is the dominant silica form and the rocks contain noticeable magnetite, while anhydrite seems restricted to late vein fillings. Alteration varies from intense to extreme. Preservation of the original rock textures varies from excellent to nil.