BGS Rock Classification Scheme
Group-1-kimberlite - A type of kimberlite. Group-1-kimberlite corresponds to archetypal rocks from Kimberley, South Africa that formerly were termed basaltic kimberlites. These are volatile-rich (dominantly CO2), potassic, ultrabasic rocks which commonly exhibit a distinctive inequigranular texture resulting from the presence of macrocrysts (and in some instances megacrysts) set in a fine-grained matrix. British Geological Survey Research Report RR/99/06, section 6.4.
| Code | G1KMB |
|---|---|
| Description | Group-1-kimberlite - A type of kimberlite. Group-1-kimberlite corresponds to archetypal rocks from Kimberley, South Africa that formerly were termed basaltic kimberlites. These are volatile-rich (dominantly CO2), potassic, ultrabasic rocks which commonly exhibit a distinctive inequigranular texture resulting from the presence of macrocrysts (and in some instances megacrysts) set in a fine-grained matrix. British Geological Survey Research Report RR/99/06, section 6.4. |
| Qualifiers | No qualifiers currently exist. |
| Definition | Volatile rich (CO2) potassic exotic intrusive rock; macro/megacrysts of +/- ol/ilmen/pyrope/enstat/chrom in fine-grained av.<0.25mm matrix of montecell/phlog/perovsk/spin/epidote/serp/sulphides/rut, +/- 2nd ol/cal/mag/serp, no primary diop; basaltic kim |
| Linked data | http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/G1KMB |
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.