SX0486 : Tintagel Volcanic Formation at Trebarwith Strand

taken 2 years ago, near to Treknow, Cornwall, Great Britain

Tintagel Volcanic Formation at Trebarwith Strand
Tintagel Volcanic Formation at Trebarwith Strand
Exposure of volcanic 'blobs' were probably intruded into sediments as pillow basalts, sills or 'bombs' from nearby volcanoes. The 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.
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SX0486, 74 images   (more nearby search)
Photographer
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Date Taken
Thursday, 26 July, 2018   (more nearby)
Submitted
Wednesday, 1 August, 2018
Geographical Context
Geological interest 
Subject Location
OSGB36: geotagged! SX 0489 8659 [10m precision]
WGS84: 50:38.7747N 4:45.6664W
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