OR/15/026 Appendix 1 Geochemical analysis of the Keith-Portsoy granite

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Gunn, A G, Mendum, J R and Thomas, C W. 2015. Geology of the Huntly and Turriff Districts. Sheet description for the 1:50 000 geological sheets 86W (Huntly) and 86E (Turriff) (Scotland). British Geological Survey Internal Report, OR/15/026.

Major element analyses (Values shown as oxides in weight percent)

Sample No. (GX) 1713 1714 1715 1716 1717 1718 1719 1720
SiO2 70.43 70.37 70.25 70.50 67.87 71.68 70.99 71.40
TiO2 0.61 0.63 0.65 0.67 0.81 0.48 0.54 0.56
Al2O3 13.90 14.11 13.96 13.88 15.00 13.78 14.01 13.82
Fe2O3 3.60 3.72 3.67 4.01 4.46 2.96 3.17 3.43
Mn3O4 0.04 0.05 0.04 0.07 0.05 0.03 0.02 0.03
MgO 0.96 0.96 1.04 1.01 2.03 1.27 1.51 0.84
CaO 1.09 1.21 1.47 1.26 1.87 1.65 0.78 1.01
Na2O 2.70 2.65 3.06 2.78 4.37 2.64 2.63 2.57
K2O 4.92 5.15 4.43 4.73 1.97 4.68 5.23 5.00
P2O5 0.17 0.18 0.18 0.18 0.05 0.12 0.12 0.17
BaO 0.07 0.07 0.07 0.07 0.13 0.22 0.24 0.07
LOI 0.86 0.82 0.73 0.77 0.93 0.57 0.70 0.92
Total 99.35 99.92 99.55 99.93 99.54 100.08 99.94 99.82

Analyses by BGS using X-Ray Fluorescence Spectrometry on fused glass beads.


Trace element analyses (Values shown as parts per million (ppm)).

Sample No. (GX) 1713 1714 1715 1716 1717 1718 1719 1720
Rb 217 222 138 224 48 144 137 211
Sr 143 142 188 148 379 188 215 135
Y 44 30 31 41 23 30 32 21
Zr 276 281 290 289 397 233 265 262
Nb 20 20 20 21 22 18 18 18
Th 17 17 16 17 17 17 19 16
Pb 23 23 20 20 22 19 12 21
Zn 59 59 31 62 57 32 16 51
Cu 8 9 1 8 19 3 1 10
Ni 10 9 9 11 17 9 12 8
Hf 6 6 7 8 10 6 6 6
U 2 4 3 5 <1 3 2 2

Analyses by BGS using X-Ray Fluorescence Spectrometry on pressed powder pellets.

Sample localities

GX 1713: Lurgbrae [NJ 5001 5719]. Massive boulder of granite showing very weak foliation. GX 1714: Hillockhead of Muldearie [NJ 3936 5106]. Large boulder of foliated granite.

GX 1715: Market Hill, Glass [NJ 4171 3965]. Large boulder of foliated granite. GX 1716: NE end of Hill of Bellyhack [NJ 3978 4314]. Boulder of foliated granite.

GX 1717: Intertidal outcrop, 390m north-north-west from Westerwards Croft [NJ 5792 6668]. Steeply dipping sheet of foliated augen granite cross cuts amphibolitic mafic sheet.

GX 1718: Boggierow Quarries [NJ 5747 6518]. Approximately 4 m-thick foliated granite sheet concordant with semipelite sequence.

GX 1719: Boggierow Quarries [NJ 5748 6516]. Approximately 1 m-thick foliated granite sheet concordant with semipelite sequence.

GX 1720: Borehole 92, E4 (145.76 m above OD) — Keith Bypass site Investigations. Outskirts of Fife Keith. [NJ 4214 5001]. Highly foliated and lineated augen granite. Sample from 7 m depth.