Rock Classification Scheme (BGS).pdf - The Water, Sanitation and ...

More documents

Recommendations

Info

anorthosite90Plag90ANORTHOSITESLevel 8(leuco-)gabbro (s.s.)gabbronoritenorite6565troctolite(meso-)35olivine-gabbroolivine-gabbronoriteolivine-norite35(mela-)Px10 10plagioclase-bearing ultramafic-rockOlULTRAMAFIC ROCKSnoritePlaggabbronoritegabbro (s.s.)Opxclinopyroxene orthopyroxene-norite-gabbro10 10595plagioclase-bearing pyroxeniteCpxLevel 8anorthosite90Plag90ANORTHOSITES(leuco-)gabbro (s.s.)gabbronoritenorite6565hornblende-gabbro(meso-)Px35pyroxene-hornblende-gabbropyroxene-hornblende-gabbronoritepyroxene-hornblende-norite10plagioclase-bearing plagioclase-bearing10hornblende-pyroxenite pyroxene-hornblendite35Hbl(mela-)ULTRAMAFIC ROCKSplagioclase-bearingpyroxeniteplagioclase-bearinghornblenditeFigure 13 Triangular diagrams for the classification and nomenclature ofgabbroic rocks based on the proportions of plagioclase (Plag), pyroxene (Px),olivine, (Ol), clinopyroxene (Cpx) and hornblende (Hbl) (after Streckeisen,1976). Rocks falling in the shaded areas of the triangular diagrams may befurther subdivided according to the diagram within the shaded rectangle.36
level 7 level 8HIERARCHICAL LEVELgabbro (s.s.)orthopyroxene-gabbrogabbronoriteclinopyroxene-noritenoriteolivine-gabbroolivine-gabbronoritegabbro(QAPF field 10)olivineclinopyroxene-noriteolivine-noritetroctoliteolivineorthopyroxene-gabbropyroxene-hornblendegabbropyroxene-hornblendegabbronoritepyroxene-hornblendeorthopyroxene-gabbropyroxene-hornblendeclinopyroxene-noritepyroxene-hornblende--noritehornblende-gabbroFigure 14 Hierarchical classification of 'gabbro QAPF Field10'.37
Page 1 and 2: BRITISH GEOLOGICAL SURVEYRESEARCH R
Page 3 and 4: Contents1 Introduction1.1 Principle
Page 5 and 6: 1 INTRODUCTIONThe use of computers
Page 7 and 8: tion of these rocks (Figure 2b), ha
Page 9 and 10: vi The use of 0.032 mm as an import
Page 11 and 12: to 75% are angular, in a block-bomb
Page 13 and 14: Field 3Field 4Field 5Fields 6Field
Page 15 and 16: (ii) If an accurate mineral mode ca
Page 17 and 18: Field S1 Rocks with the root name t
Page 19 and 20: esulting from the presence of macro
Page 21 and 22: still be a granite in the sense of
Page 23 and 24: increasing abundance. This usage in
Page 25 and 26: REFERENCESBELLIENI, G, VISENTIN, E
Page 27 and 28: kersantite lamp 31kimberlitekimbkom
Page 29 and 30: level 1 level 2 level 3 level 4Grou
Page 31 and 32: PhiunitsClast orcrystalsize in mm.L
Page 33 and 34: Figure 5 Classification andnomencla
Page 35 and 36: level 5 level 6 level 7HIERARCHICAL
Page 37: QquartzoliteLevel 790 90alkali-feld
Page 41 and 42: Level 8duniteOI90 904040peridotitep
Page 43 and 44: level 5 level 6level 7level 8level
Page 45 and 46: QLevel 890906060alkali-feldspar-rhy
Page 47 and 48: 4 Na 2 O + K 2 O wt %3foidite (TAS)
Page 49 and 50: level 5 level 6 level 7COARSE-GRAIN
Page 51 and 52: 'Old name' phl cpx leu kal melolgls
Page 53 and 54: Q = 60 - 20 Q = 20 - 5P'0-10 10-65

Rock Classification Scheme (BGS).pdf - The Water, Sanitation and ...

Create successful ePaper yourself

Delete template?

Save as template?