Pyroclastic vs Ignimbrite - What's the difference?
pyroclastic | ignimbrite |
(vulcanology) Mostly composed of rock fragments of volcanic origin or comminuted during an eruption.
*{{quote-book
, year= 1862
, year_published=
, author=
, by=
, title= The Student's Manual of Geology
, url= http://books.google.com/books?id=3DUDAAAAQAAJ&pg=PA68
, original=
, chapter= Igneous Rocks
, isbn=
, edition= 2
, publisher= Adam and Charles Black
, location= Edinburgh
, editor=
, volume=
, page= 68
, passage= The word "ash" is not a very good one to include all the mechanical accompaniments of a subaerial or subaqueous eruption, since ash seems to be restricted to a fine powder, the residuum of combustion. A word is wanting to express all such accompaniments, no matter what their size or condition may be, when they are accumulated in such mass as to form beds of "rock." We might call them perhaps "pyroclastic materials," ...
}}
A rock mostly composed of rock fragments of volcanic origin
*{{quote-book
, year= 1897
, year_published=
, author=
, by=
, title= The American Naturalist: An Illustrated Magazine of Natural History
, url= http://books.google.com/books?id=lnIWAAAAYAAJ&pg=PA221
, original=
, chapter= General Notes: Geology and Paleontology
, section = No. 363
, isbn=
, edition=
, publisher= The Edwards & Docker Co.
, location= Philadelphia
, editor= Edward D. Cope and Frederick C. Kenyon
, volume= 31
, page= 221
, passage= The basic volcanics are altered andesites, porphyritic diabases and andesites, and various pyroclastics .
}}
(geology) A deposit left by the pyroclastic flow from a volcano, consisting of ash, pumice lapilli, and lithic fragments.
*2004 , (Richard Fortey), The Earth , Folio Society 2011, p. 13:
*:The walls of the houses and shops and temples were often constructed of alternating courses of large blocks of ignimbrite and small, sienna-coloured Roman bricks.