|
|
|
|
|
|
|
|
|
Volcaniclastic
| Глоссарий геологических терминов |
Pertaining to the entire spectrum of fragmental materials with a preponderance of clasts of volcanic origin. the term includes not only pyroclastic materials but also epiclastic deposits derived from volcanic source areas by normal processes of mass movement and stream erosion. examples: welded tuff, volcanic breccia. hp
|
|
Fragmental, английский
Preponderance, английский
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
Epiclastic, английский
|
V-shaped valley, английский
A valley having a pronounced cross profile suggesting the form of the letter "v", characterized by steep sides and short tributaries; specifically a narrow valley resulting from downcutting by a stream. the "v" becomes broader as the downcutting progresses. compare - u-shaped valley. gg
Volcanic field, английский
A more or less well defined area that is covered with volcanic rocks of much more diverse lithology and distribution than a lava field, or that is so modified by age and erosion that it’s original topographic configuration, composition and extent is uncertain. compare - lava field, lava plain. sw
|
|
|
|
|
|
|
