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Burnt rocks (burnt rocks)

Weitere Funktionen

Gruppierung

Zugehörig zu

Gesteine  ⇒ Metamorphe Gesteine und Metasedimente  ⇒ Kontaktmetamorphe Gesteine  ⇒ Pyrometamorphe Gesteine

Nächst niedrigere Stufe

Porzellanit

Andere Sprachen

Deutsch

Burnt rocks

Englisch

burnt rocks

Ausführliche Beschreibung

Burnt rocks

Dies ist ein Arbeitstitel der IUGS-SSMR (IUGS (SSMR-Subcommission on the Systematics of Metamorphic Rocks) für eine neu vorgeschlagene Gesteinsgruppe, für welche es bis heute kein deutschsprachiges Äquivalent gibt.

Burnt rocks sind Gesteine, welche durch Pyrometamorphose (combustion metamorphism) gebildet wurden.

The products of combustion metamorphism have received different names in the past, for example, thermantide, thermantide porcellanite, fused shale, porcellanite, porcelain jasper. However, most of these names have also been used for the products of contact metamorphism in volcanic or near-surface settings. Thus the SG decided to find a general name for all rocks generated by combustion metamorphism and an agreement was found for the term burned (or burnt) rock, which has been defined as follows: Burned rock: General term for a compact, vesicular or clinkery, glassy to holocrystalline metamorphic rock of various colours, produced by the combustion metamorphism of pre-existing sedimentary rocks. In the fused varieties the glass coexists with refractory grains and/or newly formed minerals (e.g.melilite, wollastonite, mullite, cristobalite, spinel), whose nature reflects both the very high temperature metamorphic conditions and the variable chemical composition of the original rock. The term burned rock supersedes such old names as thermantide, thermantide porcellanite, fused shale, porcellanite, porcelain jasper. The glassy or glass-bearing varieties of burned rocks are called buchite (coal-fire buchite) or fritted rock respectively. The term burned rocks also includes some typical ash deposits of refractory material remaining after he combustion of coal seams, giving rise to soft, clay-like rocks resembling volcanic cinerites, and for which the SG proposes the name of coal-fire ashto distinguish it from ash deposits of volcanic origin.

Quellen

  • IUGS (www.bgs.ac.uk/SCMR/docs/papers/paper_10.pdf)

Gesteinszuordnungen (1)