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Journal of the Geological Society; 1991; v. 148; issue.4; p. 731-736;
DOI: 10.1144/gsjgs.148.4.0731
© 1991 Geological Society of London

Article

Volatile production during contact metamorphism: the role of organic matter in pelites

J. J. WILKINSON

Department of Geology, University of Southampton, Highfield, Southampton S09 5NH, UK

Elemental analyses of Palaeozoic mudrocks from south Cornwall indicate the presence of 0.04–0.74 wt% carbon primarily in an elemental and/or organic form, in addition to 0.04–0.10 wt% nitrogen as NH4+ in micas and in organic material. Both elements are depleted in samples from the lithologically homogeneous Mylor Slate Formation next to the Tregonning Granite, an offshoot of the Cornubian batholith. The depletions are due to an H2O-CO2-N2(-CH4) fluid formed during contact metamorphic devolatilization of the pelitic country rocks. Fluids of this type have been reported from a number of Hercynian Sn–W provinces, and may play an important role in mobilizing metals in pelitic rocks during granite-related contact metamorphism and hence in the metallogenic evolution of such regions.




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