2018

SX0486 : Tintagel Volcanic Formation at Trebarwith Strand

taken 6 years ago, near to Treknow, Cornwall, England

Tintagel Volcanic Formation at Trebarwith Strand
Tintagel Volcanic Formation at Trebarwith Strand
Fellow geologist Gavin points to an outcrop of volcanics that are exposed at Trebarwith Strand. These early Carboniferous volcanics (basic and alkali) were formed from intraplate (within a tectonic place not near a boundary) activity. I don't know but they are probably a result of minor crustal extension - this is also the cause of similar volcanics in Derbyshire.

The volcanics were interbedded with mudstones but now the entire rock package has been metamorphosed to greenschists. The metamorphic grade in the area is slightly higher than the rest of the south-west; this is due to the major faulting caused by the inversion of the Culm basin during the Variscan Orogeny.

Creative Commons Licence [Some Rights Reserved]   © Copyright Ashley Dace and licensed for reuse under this Creative Commons Licence.
Geographical Context: Geological interest
This photo is linked from: Automatic Clusters: · Volcanics were Interbedded with Mudstones [5] Title Clusters: · Tintagel Volcanic Formation at Trebarwith Strand [5] ·
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SX0486, 76 images   (more nearby 🔍)
Photographer
Ashley Dace   (more nearby)
Date Taken
Thursday, 26 July, 2018   (more nearby)
Submitted
Wednesday, 1 August, 2018
Subject Location
OSGB36: geotagged! SX 0491 8659 [10m precision]
WGS84: 50:38.7751N 4:45.6495W
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Image Type (about): close look 
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