Ra. Batchelor et Enk. Clarkson, GEOCHEMISTRY OF A SILURIAN METABENTONITE AND ASSOCIATED APATITE FROM THE NORTH ESK INLIER, PENTLAND HILLS, Scottish journal of geology, 29, 1993, pp. 123-130
Geochemical data are presented for an important metabentonite horizon
within the Upper Llandovery and early Wenlock succession of the North
Esk Inlier of the Pentland Hills. The metabentonite marks a horizon of
rapid faunal change, with a rich assemblage below and an impoverished
assemblage above. Characterizing the metabentonite and its constituen
t apatite crystals on the basis of rare earth and other trace elements
has allowed two separate outcrops to be correlated locally and the so
urce magma type identified. In addition, these apatite data provide a
chemical fingerprint with which to correlate this horizon with similar
occurrences elsewhere in northern Europe.