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Journal of the Geological Society; 1993; v. 150; issue.6; p. 1183-1191;
DOI: 10.1144/gsjgs.150.6.1183
© 1993 Geological Society of London

Article

Diachronous and independent histories of plutonism and mineralization in the Cornubian Batholith, southwest England

Y. CHEN1, A. H. CLARK1, E. FARRAR1, H. A. H. P. WASTENEYS2, M. J. HODGSON3 & A. V. BROMLEY4

1 Department of Geological Sciences, Queen’s University, Kingston, Ontario, Canada K7L 3N6
2 Jack Satterly Geochronology Laboratory, Royal Ontario Museum, 100 Queen’s Park, Toronto, Ontario, Canada M5S 2C6
3 South Crofty Mine, Dudnance Lane, Pool, Redruth, Cornwall TR15 3QH, UK
4 Petrolab, Wilson Way, Pool, Redruth, Cornwall TR15 3RS, UK

Concordant U-Pb dates of magmatic monazites in the dominant coarse-grained biotite (±muscovite) granites of the late Variscan Cornubian batholith demonstrate that the emplacement of the six main plutons was diachronous, ranging from 293.1 ±1.3 Ma (Carnmenellis) to 274.5 ± 1.4 Ma (Land's End, southern lobe). 40Ar-39Ar age spectra for magmatic muscovites confirm that cooling to about 320 °C at the present level of exposure was accomplished within 4 to 5 Ma in each intrusion. Moreover, age spectra for hydrothermal muscovites show that development of the major Sn (-Cu) lodes of the South Crofty mine commenced before 286 Ma, only 2 to 3 Ma after cooling of the hosting Cam Brea granite, a satellite of the Carnmenellis pluton. The older plutons had therefore approached ambient temperatures, and had even experienced intense hydrothermal activity, before emplacement of the youngest.




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