Models of single-stage concomitant potassium-argon exchange: an interpretation of discordant whole rock K-Ar data from hydrothermally altered igneous rocks of the South Pennine Orefield, U.K.

Details Models of single-stage concomitant potassium-argon exchange: an interpretation of discordant whole rock K-Ar data from hydrothermally altered igneous rocks of the South Pennine Orefield, U.K. Models of single-stage concomitant potassium-argon exchange: an interpretation of discordant whole rock K-Ar data from hydrothermally altered igneous rocks of the South Pennine Orefield, U.K.

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988e%26psl..88...69m&link_type=abstract

Earth and Planetary Science Letters, Volume 88, Issue 1-2, p. 69-81.

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Scientific paper

A model of single-stage concomitant potassium and argon exchange is advanced to explain the existence of rectilinear ``isochrons'' in potassium-argon correlation diagrams produced from suites of altered rocks. Negative isochron intercepts are shown to be a consequence of fractional argon loss which exceeds potassium loss, and it is demonstrated that no information of immediate geological significance can be obtained from the gradient of such an isochron. Bounds to the ``primary formation age'' and ``age of exchange event'' may be established using extreme values of the observed potassium content and from estimates based on the inferred petrology and chemistry of the unaltered rock and/or its alteration products. Ten Carboniferous igneous units from the South Pennine Orefield (involving-thirty-eight independent samples) are investigated by means of the model and eight of the units are consistent with a model of potassium and argon exchange occurring in earliest Mesozoic times (ca. 200 Ma). It is argued that this conclusion augments the already substantial body of evidence for an identifiable widespread igneous and hydrothermal province associated with early rifting processes in the North Atlantic.

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