Bowen’s Reaction Series

An Interactive Poster

P1-18 - No data

P1-19 - No data

P1-11 - No data

P1-17 - No data

Hornblende-feldspar pegmatite

60% euhedral hornblende; 40% interstitial plagioclase; associated with alkaline plutons in Nicola volcanics

black and white; medium grained; 20% quartz; 20% plagioclase; 35% K-feldspar; 25% predominant hornblende to 5 mm and minor biotite; moderately magnetic; feldspars occur mainly as fine groundmass and are hard to distinguish except for occassional larger crystals

P1-14 - No data

P1-12 - No data

Feldspar porphyritic quartz monzonite

black and white; medium grained; 15% white K-feldspar phenocrysts to 2 cm; 20% quartz (eyes?) to 7 mm; 50% granular, crumbly 2-feldspar groundmass; 15% hornblende to 3 mm and biotite; magnetite associated with mafics; minor epidote in some feldspar phenos

No data

Biotite granite

medium to coarse grained; 15% light grey quartz; 65% pale pink K-feldspar; 10% white plagioclase; 10% black biotite; 1-2 cm veinlets of quartz and fine grained K-spar

Coarse grained pink granite

grey and pink-orange; 15% quartz; 80% K-feldspar; 5% chloritic hornblende as fine crystals (some euhedral) and small masses; rare magnetite specks

Muscovite

6cm wide muscovite sheets

P1-20 - No data

P1-10 - No Data

Biotite hornblende granodiorite

medium grained; 20% K-feldspar to 5 mm; 50% plagioclase to 4 mm; 10% quartz; 20% mafics (biotite to 5 mm and hornblende? Minor disseminated magnetite and cpy

Biotite granite aplite

Very fine grained grey with 49% quartz, 50% white feldspar, 1% biotite.

Biotite granite aplite

stained for K-feldspar. Salt and pepper, fine grained, 50% white k-feldspar, 15% plagioclase, 25% quartz, 10% biotite, with rounded mafic xenolith.

Alkali feldspar megacrystic quartz syenite

stained for K-feldspar; 45% k-feldspar phenos up to 2.5cm long, white with faint zonation, 15% plagioclase, 20% quartz, 10% hornblende, 10% biotite, trace fine grained, honey-colour sphene,

Biotite hornblende quartz syenite

stained for K-feldspar, salt and pepper, medium grained, weakly foliated, 50% k-spar, 15% plagioclase, 15% quartz, 10% biotite, 10% hornblende.

Biotite hornblende granodiorite

Salt and pepper, medium grained with 20% white k-spar, 30% white plagioclase, 30% translucent grey quartz, 10% biotite, 10% hornblende.

Hornblende granodiorite

white to grey, medium grained; 20% quartz; 45% plagioclase; 10% K-feldspar; 25% weakly chloritic hornblende; composition from poor sodium cobaltinitrite stain (yellow K-spar); moderately magnetic. One narrow apple green epidote veinlet with 0.5 cm halo of weak potassic? alteration.

Biotite hornblende granodiorite

Salt and pepper, medium grained with 20% k-spar, 30% plagioclase, 30% quartz, 15% biotite, 5% hornblend.

Syenodiorite or syenogabbro

60% plagioclase laths, elongate and oriented; 30% interstitial augite(?); 10% fine, interstitial K-feldspar (stained surface)

P6-05

Biotite hornblende granodiorite

black and white; medium grained; 30% quartz; 35% plagioclase; 10% K-feldspar; 25% predominant hornblende to 6 mm and minor biotite; mafics are moderately magnetic

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