- A non-karst term. Subsurface openings formed in lava flows due to outflow of liquid lava from beneath a solidified crust or due to gas blisters. Tubes or tunnels are formed with such pseudokarst features as lava stalactites and also collapse structures and basins of closed drainage. Lava karst does not arise through solution of the rock by circulating water and thus is not a true karst .Synonyms: (French.) pseudo- karst; (German.) ( Vulkanischer Karst), Lava- Karst, Pseudokarst; (Greek.) pseudokarst; (Italian.) pseudocarsismo vulcanico; (Spanish.) volcanokarst (general), tubo volcanico (tube, tunnel), jameo (collapse structure), malpaís (topographic feature similar to lapiés); (Turkish.) lav karst2, a ldat2c2 karst.
A Lexicon of Cave and Karst Terminology with Special Reference to Environmental Karst Hydrology. Courtesy of the author & The Karst Waters Institute. 2002.
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lava cave — , lava tube 1. A cave that formed in a partly cooled, broadly basaltic or phonolitic lava, not by erosion but by molten material flowing away. In most cases, an initial active lava conduit is formed when a flowing surface lava stream has a… … Lexicon of Cave and Karst Terminology
lava bed — A lava flow of considerable areal extent and relatively small thickness  … Lexicon of Cave and Karst Terminology
lava tube — See lava cave … Lexicon of Cave and Karst Terminology
Karst topography — is a landscape shaped by the dissolution of a layer or layers of soluble bedrock, usually carbonate rock such as limestone or dolomite. Due to subterranean drainage, there may be very limited surface water, even to the absence of all rivers and… … Wikipedia
tube, lava — See lava cave … Lexicon of Cave and Karst Terminology
pseudokarst — 1. Terrane with features similar to karst but formed in nonsoluble rocks, as by melting of permafrost or ground ice, collapse after mining, and by outflow of liquid lava from beneath its solidified crust . 2. Karst like terrane produced … Lexicon of Cave and Karst Terminology
pahoehoe — (Hawaiian.) Lava flows with a smooth or billowy surface in which lava tubes are found . See also lava cave; pseudokarst … Lexicon of Cave and Karst Terminology
spring, submarine — 1. A spring emerging in a sea or lagoon predominantly in karst terranes. This is a descriptive term generally corresponding to the genetic term drowned spring .’ 2. Large offshore emergence, generally from cavernous limestone, but in… … Lexicon of Cave and Karst Terminology
phonolite — A type of volcanic rock, common as lava flows in some areas, that is capable of supporting the formation of extensive lava caves, including those on Mount Suswa in Kenya  … Lexicon of Cave and Karst Terminology
vulcanokarst — An area comprised of tubular caves within lava flows and shows evidence of mechanical collapse of the roof into them. See also lava cave; pseudokarst … Lexicon of Cave and Karst Terminology