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The Graphite Deposit of Seathwaite in Borrowdale, Cumberland

Published online by Cambridge University Press:  01 May 2009

R. G. J. Strens
R. G. J. Strens
Affiliation:
Department of Mineralogy and Petrology, University of Cambridge.
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Abstract

Graphite was deposited in and around a diabase intruded along post-Borrowdale Volcanic, pre-Bala faults about 4,000 feet above the Skiddaw Slate–Borrowdale Volcanic boundary. Associated copper-lead-zinc mineralization follows faults of the same trend, and is isotopically dated at 470 million years (mid-Ordovician). The breakdown of carbon monoxide in the magmatic gases was promoted by substances (notably pyrite, iron oxides, iron silicates, and quartz) which catalysed the Boudouard reaction 2CO ⇌ CO2 + C. The PT conditions of deposition of the graphite and associated minerals are estimated at P ~ 1,000 bars, T ~ 120° to 600° C. Possible occurrences of natural interlamellar compounds of graphite are discussed.

Type
Articles
Information
Geological Magazine , Volume 102 , Issue 5 , October 1965 , pp. 393 - 406
Copyright
Copyright © Cambridge University Press 1965

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References

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