Geo Advent Calendar Day 15

It’s #ThinSectionThursday again so here’s a thin section of the oldest (terrestrial) rock in my collection. I collected this sample on my one month long independent mapping fieldtrip. The thin section was used in my mapping report.15 Gneiss.jpg

Accession Number C0086
Status Accessioned
Specimen Type Thin section
Brief Description Gneiss
Full Description A thin section of C0085, Lewisian gneiss. An orthogneiss rich in quartz and plagioclase with minor amounts of amphibole, biotite and olivine. The protolith formed 3.03-2.96Ga ago, had a tonalitic composition and was metamorphosed in the granulite facies
Quantity 1
Age (Ma) 2590
Location Loch Assynt, Scotland
Collector Nadine Gabriel
From Fieldtrip? GEOL3042: Geological and Environmental Mapping, 2015-07-02 to 2015-07-31
Associated Notebook? Notebook 4
Acquisition Method Collected
Acquisition Date 2015-07-26 (date of rock collection, thin section obtained on 2016-01-11)

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