Rock Classification Scheme (BGS).pdf - The Water, Sanitation and ...
Rock Classification Scheme (BGS).pdf - The Water, Sanitation and ...
Rock Classification Scheme (BGS).pdf - The Water, Sanitation and ...
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
level 5 level 6 level 7HIERARCHICAL LEVEL* c-g-c = coarse-grained-crystallineFIELDCLASSIFICATIONquartz-richc-g-c-rock*QAPF CLASSIFICATIONquartzolitequartz-rich-granitic-rockalkali-feldspar-graniteQAPFFIELD1a1b2Where the name of a group ofminerals appears in a root name, itmay be replaced by a more definitivemineral name, where appropriate, forexample albite-granite instead ofalkali-feldspar-granite, <strong>and</strong> nephelinebearing-gabbroinstead of foidbearing-gabbro.Such root names areat level 8 of the hierarchy.granitic-rockgranite **granodioritetonalitequartz-alkali-feldspar-syenitealkali-feldspar-syenitefoid-bearing-alkali-feldspar-syenitequartz-syenite3456*66'7*syenitic-rocksyenite7** As shown in Figure 11, the fieldfor granite on QAPF may be dividedinto syenogranite <strong>and</strong> monzogranite.<strong>The</strong>se root names are at level 8 of thehierarchy.foid-bearing-syenitequartz-monzonitemonzonitefoid-bearing-monzonite7'8*88'quartz-monzodiorite9*monzodiorite9dioritic-rockfoid-bearing-monzodioritequartz-diorite9'10*COARSE-GRAINEDNORMALCRYSTALLINE ROCKSM