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K-Ar ages from the ore deposits and related rocks of the Isle of Man

Published online by Cambridge University Press:  01 May 2009

P. R. Ineson  and
J. G. Mitchell
P. R. Ineson
Affiliation:
Department of Geology, University of Sheffield, Sheffield, England
J. G. Mitchell
Affiliation:
School of Physics, The University, Newcastle upon Tyne
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Summary

Thirty-seven new K-Ar isotopic ages are reported from the Isle of Man. Thirty clay mineral concentrates from vein gouges and altered wallrocks when interpreted with the remaining seven whole rocks and mineral ages indicate that at least five periods of metasomatism have affected the rocks. It is argued that these can be identified with episodes of ore deposition. The earliest phase, N of the Foxdale area, occurred at 310–320 Ma and appears to be the most extensive of the episodes recorded. In the S of the island, mineralization occurred later at c. 285 Ma and again at c. 250 Ma. Minor Triassic activity is expressed by a cross-course on the Foxdale lode, and a single locality displaying Tertiary mineralization was recognized. The conformity of these ages to the general episodic pattern of ore deposition in the British Isles is demonstrated.

Type
Articles
Information
Geological Magazine , Volume 116 , Issue 2 , March 1979 , pp. 117 - 128
Copyright
Copyright © Cambridge University Press 1979

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