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

More documents

Recommendations

Info

Level 6Qquartz-richcoarse-grained-rock60granitic-rock65 20dioritic-rockAsyenitic-rockgabbroic-rockanorthositic-rock10Pfoid-dioritic-rockfoid-syenitic-rockfoidgabbroic-rock60foidolitic-rockFigure 10 QAPF field classification of coarse-grainedcrystalline rocks (after Streckeisen, 1976).F34
QquartzoliteLevel 790 90alkali-feldspargranite60quartz -richgranitic-rockgranite60granodioritetonalitequartz-monzodioritequartz-monzogabbroquartzmonzonitemonzonitefoid-bearingmonzonitequartz-alkali-feldsparsyeniteAfoid-bearingalkali-feldsparsyenite51020(monzogranite)(syenogranite)foidmonzosyenitefoidmonzogabbro10 35 65 90alkali-feldsparsyenitequartzsyenitesyenitefoid-bearingsyenite10 5090foidmonzosyenite20quartz-dioritequartz-gabbroquartz-anorthosite105Pmonzodioritemonzogabbrodioritegabbroanorthositefoid-bearing-dioritefoid-bearing-gabbrofoid-bearing-anorthositefoid-syenite60 60foidolitefoid-bearing-monzodioritefoid-bearing-monzogabbrofoid-dioritefoid-gabbroQAPF = 100FFigure 11 Classification and nomenclature of coarse-grained crystalline rocksaccording to their modal mineral contents using the QAPF diagram (based onStreckeisen, 1976). The corners of the double triangle are Q = quartz, A = alkalifeldspar, P = plagioclase and F = feldspathoid. This diagram must not be usedfor rocks in which the mafic mineral content, M, is greater than 90%.Level 76090Q1a1b9060Figure 12 Field numbers of the QAPFdiagram (based on Streckeisen,1976).Fields 6* to 10* are slightlyoversaturated variants of fields 6 to 10,respectively, while 6' to 10' are slightlyundersaturated variants.23a 3b 4 510 35 65 9020206* 7* 8* 9* 10* P5 56 7A89 106' 7' 8'9' 10'101011121314M > 90 1660 6015F35
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: level 5 level 6 level 7HIERARCHICAL
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

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

Create successful ePaper yourself

Delete template?

Save as template?