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Cinders
| Глоссарий геологических терминов |
Uncemented vitric, vesicular, pyroclastic material, more than 2.0 mm in at least one dimension, with an apparent specific gravity (including vesicles) of more than 1.0 and less than 2.0. compare - ash [volcanic], block [volcanic], lapilli, scoria, tephra. kst
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Pyroclastic, английский
- Pertaining to fragmented (clastic) rock material formed by a volcanic explosion or ejection from a volcanic vent.
- An igneous rock composed of angular rock fragments that originate from a volcanic explosion.
- (adj.) pertaining to clastic rock particles produced by explosive, aerial ejection from a volcanic vent. such materials may accumulate on land or under water. compare - epiclastic, volcaniclastic, clastic. g. smith & hp
- General term for any rock composed of material ejected explosively from
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Circular gilgai, английский
A type of gilgai dominated by circular closed depressions (micro-lows) separated by low mounds (micro-highs); the prevailing type of gilgai on relatively level terrain (slopes < 3 %). distance from micro-high to the center of an adjacent micro-low is generally 4 - 8 m. compare - elliptical gilgai, linear gilgai, gilgai. sw
Chimney [gilgai], английский
A subsurface feature that forms a crude cone or wave-crest structure centered under a micro-high (e.g. a low mound or rim) and extending at least part-way under adjacent intermediate positions, composed of substratum material that appears to upwell and reaches close to the surface. a chimney is commonly bounded by master slickensides in the subsoil with maximum angles of dip reaching 60 - 75 degrees under the micro-high. its morphology is distinct from the soil solum of the adjacent micro-lows (e.g. lighter colored and more alkaline and contain carbonate or gypsum concretions absent under micro-lows).
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