![Annual report . is locality and is therefore an older rock. Theolder porphyritic rock is syenite porphyry, containing, under the microscope,phenocrysts of orthoclase with zonal structure and numerous hornblende crystals in 1920 Annual report . is locality and is therefore an older rock. Theolder porphyritic rock is syenite porphyry, containing, under the microscope,phenocrysts of orthoclase with zonal structure and numerous hornblende crystals in 1920](https://c8.alamy.com/comp/2AWG5R6/annual-report-is-locality-and-is-therefore-an-older-rock-theolder-porphyritic-rock-is-syenite-porphyry-containing-under-the-microscopephenocrysts-of-orthoclase-with-zonal-structure-and-numerous-hornblende-crystals-in-1920-kirkland-lake-gold-area-15-a-fine-grained-feldspathic-groundmass-containing-apatite-and-magnetite-witlisecondary-calcite-minute-blades-of-sericite-are-scattered-through-the-rock-a-diabasic-rock-apparently-a-facies-of-the-lamprophyre-occurs-on-claim-nol-3643-syeniteas-previously-mentioned-thereis-a-red-rock-associated-with-the-basiclamprophyre-either-in-hvoac-2AWG5R6.jpg)
Annual report . is locality and is therefore an older rock. Theolder porphyritic rock is syenite porphyry, containing, under the microscope,phenocrysts of orthoclase with zonal structure and numerous hornblende crystals in 1920
![Figure 6 | Geology, alteration and lithogeochemistry of the Paleoproterozoic Korpela VMS occurrence in Eastern Finland | SpringerLink Figure 6 | Geology, alteration and lithogeochemistry of the Paleoproterozoic Korpela VMS occurrence in Eastern Finland | SpringerLink](https://media.springernature.com/full/springer-static/image/art%3A10.1007%2Fs00126-020-00954-0/MediaObjects/126_2020_954_Fig6_HTML.png)
Figure 6 | Geology, alteration and lithogeochemistry of the Paleoproterozoic Korpela VMS occurrence in Eastern Finland | SpringerLink
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Modelling effect of sericitization of plagioclase on the 40K/40Ar and 40Ar/39Ar chronometers: implication for dating basaltic rocks and mineral deposits | Geological Society, London, Special Publications
![. Bulletin . gnizable in the hand specimen. Microscopic study shows that the principal mineral constituents in theorder of their relative abundance are quartz, sericite, feldspar, chlorite,and carbonate (calcite ?). The textural characteristics and mineral com ... . Bulletin . gnizable in the hand specimen. Microscopic study shows that the principal mineral constituents in theorder of their relative abundance are quartz, sericite, feldspar, chlorite,and carbonate (calcite ?). The textural characteristics and mineral com ...](https://c8.alamy.com/zooms/6/4e6417584cc048efaaa93f200873c0a0/2ce4j2b.jpg)
. Bulletin . gnizable in the hand specimen. Microscopic study shows that the principal mineral constituents in theorder of their relative abundance are quartz, sericite, feldspar, chlorite,and carbonate (calcite ?). The textural characteristics and mineral com ...
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