Rock 366 : Day 366 : Mohorovičić Discontinuity

•January 3, 2013 • Comments Off

Day 366 : For a finish to Project Rock 366 I had to do something special, so ladies & gentlemen I give you the Mohorovičić discontinuity. The top of the image is a serpentinised leucotroctolite (anothosite and olivine) cumulate from the lower crust and the lower part is serpentinised peridotite from the mantle. Coverack, Lizard Peninsula, Cornwall.

Note: In reality, at Coverack, the sequence passes from gabbro, interlayered gabbros, troctolites and serpentinised peridotites, to just serpentinites over ~100m so there is a transition zone rather than a sharp boundary.Image

Rock 366 : Day 365 : Granite Bridge

•January 2, 2013 • Comments Off

Cornwall161

Day 365 : Cornish plagiogranite footbridge above River Cove, Treveal, Cornwall.

Rock 366 : Day 364 : Gramscatho Group

•January 2, 2013 • Comments Off

Cornwall158

Day 364 : Devonian Gramscatho Group sediments with small mine adits along mineralised fault plane. Trevaunance Bay, St Agnes, Cornwall.

Rock 366 : Day 363 : Granite xenolith

•January 2, 2013 • Comments Off

Cornwall155

Day 363 : Xenolith in Cornish Granite on reverese of memorial to “Operation Chariot”, the Royal Navy / Commando raid on St Nazaire docks in 1942. Falmouth, Cornwall, from where the raid was launched. 

Rock 366 : Day 362 : Tin Mine

•January 2, 2013 • Comments Off

Cornwall125

Day 362 : The Towanwroath Shaft engine house at Wheal Coates tin mine made from local Gramscatho Group stone, St Agnes Head, Cornwall.

Rock 366 : Day 361 : Tin Quarry

•January 2, 2013 • Comments Off

Cornwall088

Day 361 : Mineral vein in Gramscatho Group, quarried out above the old quay at Trevaunance Bay, St Agnes, Cornwall, UK.

Rock 366 : Day 360 : Braunite

•January 2, 2013 • Comments Off

Cornwall003_1

Day 360 : Braunite (manganese silicate) from Tirodi Mine, Tirodi, Madhya Pradesh, India.  Cotton collection, Keele.

 
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