BGS Rock Classification Scheme
Para-amphibolite - A type of calcsilicate-rock. In the Rock Classification Scheme, it is one composed largely of hornblende and plagioclase. This mineralogy reflects amphibolite facies conditions. Note the para- prefix indicates a rock that is thought to have a sedimentary protolith, in contrast with ortho-amphibolite which has an igneous protolith, and amphibolite where the nature of the protolith is not defined. British Geological Survey Research Report RR/99/02, section 3.2.
| Code | PAMPHB |
|---|---|
| Description | Para-amphibolite - A type of calcsilicate-rock. In the Rock Classification Scheme, it is one composed largely of hornblende and plagioclase. This mineralogy reflects amphibolite facies conditions. Note the para- prefix indicates a rock that is thought to have a sedimentary protolith, in contrast with ortho-amphibolite which has an igneous protolith, and amphibolite where the nature of the protolith is not defined. British Geological Survey Research Report RR/99/02, section 3.2. |
| Qualifiers | No qualifiers currently exist. |
| Definition | Crystalloblastic commonly foliated meta-sedimentary rock (grain size & protolith undefined); 35-90% mafic minerals hornblende+plagioclase dominant +/-garnet/biotite/quartz |
| Linked data | http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/PAMPHB |
CAVEAT
"Thumbnail" definitions attached to some of the table entries are an interim attempt to provide simple short descriptions of the "unqualified" rock types presented within the BGS Rock Classification Scheme. Every effort has been made to ensure accuracy and consistency but minor contradictions or omissions might be present. The BGS welcomes any feedback pointing out such minor imperfections and/or providing constructive comment and suggestions for improvement of the definitions. In the first instance such feedback should be directed to Dr Tim McCormick.