semiconformable alteration zone

GLOSSARY OF VOLCANIC TERMS
A regional zone of hydrothermal alteration typically characterized by a sheet-like or cloud-like geometry. Semiconformable alteration zones are generally quite extensive in permeable rock units (e.g. tuffs, medium- to coarse-grained clastic sediments and sedimentary rocks), and are generally patchy in less permeable rock units (e.g. lavas, intrusions). These zones commonly are found along the periphery of "pipe-like" alteration zones, which are generally confined to regions in close proximity to synvolcanic structures (e.g. synvolcanic faults zones) (Morton and Franklin, 1987).

Glossary of volcanic terms. - University of Wisconsin Oshkosh. . 2001.

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