tourmaline Archives - Geology North https://www.geologynorth.uk/tag/tourmaline/ No vestige of a beginning, - no prospect of an end Sat, 19 May 2018 23:03:44 +0000 en-GB hourly 1 https://wordpress.org/?v=6.3.1 https://www.geologynorth.uk/wp-content/uploads/2022/03/Icon-53x53.jpeg tourmaline Archives - Geology North https://www.geologynorth.uk/tag/tourmaline/ 32 32 Woolhope Crag and the Cheviot https://www.geologynorth.uk/woolhope-crag-and-the-cheviot/ Fri, 23 Aug 2013 21:04:55 +0000 http://www.geologynorth.uk/?p=16867 We go to see if the theory of the darker rocks making tougher landscape features, would hold at Woolhope Crag (NT 92264 22169). The answer was ambiguous. There is certainly plenty of dioritic rock there but there is also a pale fine-grained granophyric rock. We subsequently made our way up the north slopes of the … Continue reading Woolhope Crag and the Cheviot →

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]]> We go to see if the theory of the darker rocks making tougher landscape features, would hold at Woolhope Crag (NT 92264 22169).
The answer was ambiguous. There is certainly plenty of dioritic rock there but there is also a pale fine-grained granophyric rock. We subsequently made our way up the north slopes of the Cheviot, and found plenty of scattered exposures which revealed more of the granophyric rock. We have classified this type on the map as ‘Evolved’ granite.
Descending from Cheviot summit on the main path for Langlee in the Harthope valley, we found distinct quartz veining with tourmaline content (approx. NT 918 209). There is the possibility that this quartz veining is the result of hydrothermal penetration on lines of weakness between different types of plutonic rock.
We need to pay another visit to investigate this.

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