Rock that has fabric and composition indicating open-system mineralogical and chemical changes in response to interaction with a fluid phase, typically water rich.
SLTTm (2004) proposed the following criteria to distinguish hydrothermally altered or metasomatic rock from igneous rock. "The rock is classified as metamorphic if (1) the texture has been modified such that it can no longer be considered igneous, (2) the bulk composition of the rock is inconsistent with compositions that can be derived purely from a magma and associated processes such as assimilation and differentiation, or (3) minerals inconsistent with magmatic crystallization are present."
See Also: Aceite, spilite, argillisite, beresite, endoskarn, fenite, greisen, gumbeite, propylite, rodingite
Parents: Composite genesis rock (65)
Children: Skarn (242); Spilite (244)
[Description taken from GeoSciML SimpleLithology201012.rdf]
Category: Analysed material
The different kinds of sample material collected in the field have been classified hierarchically. Examples: “till”, “soil”, “vegetation”. Taken from the “Sample_Types_SHARED” database table.
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