sillarn.

/siːlˈjɑː/

Etymology: Spanish.

Geology.

An ignimbrite or volcanic tuff that has not become indurated by welding.

ΚΠ

1948 C. N. Fenner in Bull. Geol. Soc. Amer. LIX. 883 There has been a tendency to call all such deposits ‘welded tuffs’... For those in which induration is primarily the result of recrystallization, and for those in which the fragments have little cohesion, another term is desirable. The local term ‘sillar’.., commonly used in the Arequipa region [in Peru], has been applied in the present paper.

1948 C. N. Fenner in Bull. Geol. Soc. Amer. LIX. 887 These occurrences of both white and salmon sillar contain scattered inclusions of white pumice.

1965 F. H. Hatch & R. H. Rastall Petrol. Sedimentary Rocks (ed. 4) xv. 322 Both sillars and welded tuffs frequently exhibit columnar jointing, somewhat akin to that in lava flows proper.

1978 Nature 24 Aug. 750/1 In the outcrops visited, two distinct flow units, each up to 30 m thick, were consistently present, both exhibiting the properties of classic sillar.

This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018).

单词	sillar
释义	sillarn. /siːlˈjɑː/ Etymology: Spanish. Geology. An ignimbrite or volcanic tuff that has not become indurated by welding. ΚΠ 1948 C. N. Fenner in Bull. Geol. Soc. Amer. LIX. 883 There has been a tendency to call all such deposits ‘welded tuffs’... For those in which induration is primarily the result of recrystallization, and for those in which the fragments have little cohesion, another term is desirable. The local term ‘sillar’.., commonly used in the Arequipa region [in Peru], has been applied in the present paper. 1948 C. N. Fenner in Bull. Geol. Soc. Amer. LIX. 887 These occurrences of both white and salmon sillar contain scattered inclusions of white pumice. 1965 F. H. Hatch & R. H. Rastall Petrol. Sedimentary Rocks (ed. 4) xv. 322 Both sillars and welded tuffs frequently exhibit columnar jointing, somewhat akin to that in lava flows proper. 1978 Nature 24 Aug. 750/1 In the outcrops visited, two distinct flow units, each up to 30 m thick, were consistently present, both exhibiting the properties of classic sillar. This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018). < n.1948
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