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Тефра
| Англо-русский словарь по геологии |
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Tephra, английский
- Materials of all types and sizes that are erupted from a crater or volcanic vent and deposited from the air.
- A collective, general term for any and all clastic materials, regardless of size or composition, ejected from a vent during a volcanic eruption and transported through the air; including ash [volcanic; < 2 mm], blocks [volcanic; > 64 mm], cinders [volcanic; 2 - 64 mm], lapilli [2 - 76 mm & specific gravity > 2.0], pumice [> 2 mm & specific gravity < 1.0], and scoria [> 2 mm & specific gravity < 2.0]. tephra, unlike many volcaniclastic terms, does not denote properties of composition, vesicularity, or grain size. sw
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Tephrite, английский
Тетраэдрический, русский
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