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