SW9257 : Wheal Remfry Breccia

taken 4 years ago, near to Fraddon, Cornwall, Great Britain

Wheal Remfry Breccia
Wheal Remfry Breccia
Apologies for the off site picture, no camera on the day. This is a chunk of the Wheal Remfry breccia taken from the operating pit (with an organised party). An accumulation of borosilicate fluid/vapour in the roof of the crystallising granite lead to an increase in fluid pressure. Eventually the fluid utilised a fault or weakness to the surface resulting in an explosive decompression. The following collapse lead to a breccia consisting of angular killas clasts (country rock) and milled granite in a fine grained tourmalinite ground mass. The ratio of granite and killas varies; some samples seen were mostly killas, indicating the location was close to the granite/killas contact. The rock is removed for aggregate by Aggregate Industries in partnership with Imerys who benefit from the secondary aggregate tax break.

Quite a bit of important geology but a pain to the pit manager!
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SW9257, 6 images   (more nearby )
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Date Taken
Friday, 4 October, 2013   (more nearby)
Friday, 4 October, 2013
Geographical Context
Geological interest 
Subject Location
OSGB36: geotagged! SW 9232 5763 [10m precision]
WGS84: 50:22.9082N 4:55.3527W
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