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

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a.Level 7blocks and bombs(>64mm)or block-tephraor bomb-tephra75ash-breccia25lapillitephralapilli(64-2mm)lapilli-ashashash(64mm)agglomerateor pyroclasticbreccia75tuff-breccialapilli-stonelapilli-tufftuff25lapilli(64-2mm)ash(>2mm)Figure 8a. Classification of pyroclastic sediments.b. Classification of pyroclastic rocks.Both modified from Fisher and Schminke, 1984.32
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, and 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 and monzogranite.These 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
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: Figure 5 Classification andnomencla
Page 37 and 38: QquartzoliteLevel 790 90alkali-feld
Page 39 and 40: level 7 level 8HIERARCHICAL LEVELga
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

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