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

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trachydacite fgr TAS 17b, 20trachyte fgr 7 17a, 19trachyte(TAS) fgr TAS 17b, 20trachytic-rock field 17a, 18troctolite cgr 10# 13, 14tuff vclast 4, 5, 8tuffaceous-sediment vclast 4tuffaceous-sedimentary-rock vclast 4tuffaceous- + sedimentaryroot name vclast 4, 6tuff-breccia vclast 4, 8tuffite vclast 4ultramafic-melilitic-rock meli 27, 28ultramafic-rock field 9, 12ultramafitite fgr 16 17a, 19vogesite lamp 31volcaniclastic-igneous-rock vclast 1volcaniclastic-igneous- vclast 1sedimentvolcaniclastic-sediment vclast 4volcaniclastic-sedimentary-rock vclast 4volcaniclastic- + sedimentaryroot name vclast 4, 6websterite cgr 16# 15, 16wehrlite cgr 16# 15, 1626
level 1 level 2 level 3 level 4Groups of rocks shown inthis column are classifiedat different levels ofthe hierarchy.artificialand naturalsuperficialdepositsfragmentaligneousrocks andsedimentsvolcaniclasticigneous rocksand sedimentsvolcaniclasticsedimentary rocksand sedimentstuffitespyroclasticrocks andsedimentsallrocksanddepositssedimentaryrocks andsedimentsigneousrocks andsedimentscrystallineigneousrockscrystalline igneous rocks maycontain or consist of glass'normal'crystallinerocks'exotic'crystallinerockscoarse-grainedcrystalline rocksfine-grainedcrystalline rockscarbonatitesmeliliticrockskalsiliticrockskimberlitesmetamorphicrockslamproitesleuciticrockslamprophyresFigure 1 Hierarchical classification of igneous rocks and igneous sediments,Dashed lines with arrows connect major groups of rocks and sediments between which there is agradational 'boundary'. Dotted lines indicate that 'fragmental igneous rocks and sediments' may also oralternatively be classified within other schemes.27
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: kersantite lamp 31kimberlitekimbkom
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 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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