volcanic block


volcanic block
   A pyroclast that was ejected in a solid state; it has a diameter greater than 64 mm.
   Compare: cinders, lapilli, tephra, volcanic bomb.
   GG

Glossary of landform and geologic terms. 2013.

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  • block —    [ volcanic ]    (not preferred)    refer to volcanic block …   Glossary of landform and geologic terms

  • block — USGS PHOTO GLOSSARY OF VOLCANIC TERMS A volcanic block is a solid rock fragment greater than 64 mm in diameter that was ejected from a volcano during an explosive eruption. Blocks commonly consist of solidified pieces of old lava flows that were… …   Glossary of volcanic terms

  • volcanic bomb —    A pyroclast > 64 mm in at least one dimension that was ejected while still viscous and solidified into its rounded form in flight.    Compare: cinders, lapilli, tephra, volcanic block.    GG …   Glossary of landform and geologic terms

  • Volcanic blocks — are fragments of rock which measure more than 64mm in size and are erupted in a solid condition. Blocks are formed from material from previous eruptions or from country rock and are therefore mostly accessory or accidental in origin. Blocks also… …   Wikipedia

  • Musgrave Block — The Musgrave Block is an east west trending belt of Proterozoic granulite gneiss basement rocks approximately 500km long. The Musgrave Block extends from western South Australia into Western Australia. The Musgrave Block is primarily exposed… …   Wikipedia

  • Wells Gray-Clearwater volcanic field — A view from Green Mountain with Pyramid Mountain in the distance Elevation …   Wikipedia

  • Potrillo volcanic field — The Potrillo Volcanic Field is a monogenetic volcanic field located on the Rio Grande Rift in New Mexico, USA and Chihuahua, Mexico. It lies convert|35|km|mi|0 west of El Paso, Texas. Rio Grande Rift *Rifting began in Late Oligocene cite book |… …   Wikipedia

  • North Island Volcanic Plateau — View of the Central Plateau from the Desert Road showing the three active peaks: Snow capped Ruapehu (left), conical Ngauruhoe (centre) and broad domed Tongariro (right) The North Island Volcanic Plateau (often called the Central Plateau and… …   Wikipedia

  • Back River volcanic complex — The Back River volcanic complex is an Archean stratovolcano, located km to mi|num=480|abbr=no|spell=Commonwealth|precision=0|wiki=yes northwest of Yellowknife, Northwest Territories, Canada. The volcano constitutes the Back Group of the… …   Wikipedia

  • Bangweulu Block — The Bangweulu Block is a cratonic unit that forms part of the Congo craton of central Africa. The Bangweulu Block however consists of Palaeoproterozoic granitoids and volcanics, and is overlain by a Palaeoproterozoic continental sedimentary… …   Wikipedia