accretionary lapilli

GLOSSARY OF VOLCANIC TERMS
Spherical aggregates (commonly with a concentric structure) formed by the accretion of moist ash in eruption clouds (White and Houghton, 2000, p. 495). Also used for all ash aggregates, including mud lumps (Houghton et al., 2000, p. 513).

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

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  • Lapilli — is a size classification term for tephra, which is material that falls out of the air during a volcanic eruption. Lapilli (singular: lapillus) means little stones in Latin. They are in some senses similar to ooids or pisoids in calcareous… …   Wikipedia

  • lapilli — GLOSSARY OF VOLCANIC TERMS A textural term for fragments in volcanic rocks and volcanic deposits that range from 2mm to 64mm in diameter (Fisher, 1966; Schmid, 1981). USGS PHOTO GLOSSARY OF VOLCANIC TERMS Rock fragments between 2 and 64 mm (0.08… …   Glossary of volcanic terms

  • armoured lapilli — GLOSSARY OF VOLCANIC TERMS A type of accretionary lapilli composed of a crystal, pumice, or lithic fragment core which is surrounded by a rim of fine to coarse ash (McPhie et al., 1993, p. 29) …   Glossary of volcanic terms

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  • lapillus — /leuh pil euhs/, n., pl. lapilli / pil uy/. a small stony particle ejected from a volcano. [1740 50; < L: little stone, pebble, dim. of lapis stone] * * * ▪ volcanic ejecta plural  Lapilli,   unconsolidated volcanic fragment with a diameter… …   Universalium

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  • Graup — Günther Graup (* 13. September 1940 in Landshut; † 24. April 2006 in Wörrstadt) war ein deutscher Geologe und Impaktforscher. Dr. Günther Graup befasste sich überwiegend mit mineralogisch petrographischen Themen, darunter im Wesentlichen mit dem… …   Deutsch Wikipedia

  • Günther Graup — (* 13. September 1940 in Landshut; † 24. April 2006 in Wörrstadt) war ein deutscher Geologe und Impaktforscher. Wirken Günther Graup befasste sich überwiegend mit mineralogisch petrographischen Themen, darunter im Wesentlichen mit dem Ries… …   Deutsch Wikipedia

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