Linhope Burn Archives - Geology North https://www.geologynorth.uk/tag/linhope-burn/ No vestige of a beginning, - no prospect of an end Sat, 27 Jun 2020 14:47:15 +0000 en-GB hourly 1 https://wordpress.org/?v=6.4.2 https://www.geologynorth.uk/wp-content/uploads/2022/03/Icon-53x53.jpeg Linhope Burn Archives - Geology North https://www.geologynorth.uk/tag/linhope-burn/ 32 32 Great Standrop https://www.geologynorth.uk/great-standrop/ Thu, 30 Jul 2015 15:38:30 +0000 http://www.geologynorth.uk/?p=16891 I visit Little and Great Standrop to confirm that these fine tors consist of coarse-grained porphyritic ‘granite’.The rock here is the classic grey type with large white phenocrysts of andesine feldspar. At Great Standrop aplite dykes are apparent cutting through the coarser rock which extends down to the rocky collar ringing the slopes above the … Continue reading Great Standrop →

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]]> I visit Little and Great Standrop to confirm that these fine tors consist of coarse-grained porphyritic ‘granite’.
The rock here is the classic grey type with large white phenocrysts of andesine feldspar. At Great Standrop aplite dykes are apparent cutting through the coarser rock which extends down to the rocky collar ringing the slopes above the Linhope Burn at around NT 944 177. At the foot of the collar, the rock appears to change to the medium-grained pink ‘granite’.
At NT 94590 17775, I find a fine-grained pink rock which I take to be a chilled margin of the pink medium-grained rock against the coarser material of the main Standrop ridge.
The characteristic coarse-grained ‘Standrop’ rock proves difficult to classify. Quartz content is roughly 20%, and in places plagioclase exceeds K-feldspar. The rock lies on the granite/syenite/monzonite/granodiorite boundary.

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]]> Knock Hill and Upper Linhope Burn https://www.geologynorth.uk/knock-hill-and-upper-linhope-burn/ Thu, 03 Apr 2014 21:39:34 +0000 http://www.geologynorth.uk/?p=16871 Knock Hill (NT 99584 16499) with its attendant gorge is an impressive feature on the road towards Linhope. It is composed of ignimbrite, and gives evidence that the Cheviot volcanic system was explosive, and produced abundant pyroclastic surges and ash fall, as well as andesite lava flows. The 1” OS geological map notes a ‘hypersthene-porphyrite’ … Continue reading Knock Hill and Upper Linhope Burn →

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]]> Knock Hill (NT 99584 16499) with its attendant gorge is an impressive feature on the road towards Linhope. It is composed of ignimbrite, and gives evidence that the Cheviot volcanic system was explosive, and produced abundant pyroclastic surges and ash fall, as well as andesite lava flows.
The 1” OS geological map notes a ‘hypersthene-porphyrite’ dyke which we locate at NT 99584 16499 on the south side of the Breamish burn, just beyond the road bridge.
From here, a walk to the upper reaches of the Linhope Burn (around NT 94094 17459) and on to the Standrop Burn. (NT 93794 17839) There is a dacite dyke showing in the streambed just above the two burns’ confluence.
The streambed reveals a variety of rock types. The coarse-grained (Standrop) and finer-grained pink (Dunmoor) varieties in evidence. There is also a much finer grained pale rock similar to the ‘evolved’ granophyre from the Cheviot.
According to Al-Hafdh, this is ‘Woolhope’ granite, part of a ring dyke that circles from the upper Standrop Burn area through to the upper Dunmoor Burn area.

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