Richard A. Batchelor, Jane Evans; Rare earth element and Sr–Nd isotope geochemistry of primary apatite crystals in metabentonites from Dob’s Linn, southern Scotland. Scottish Journal of Geology ; 40 (1): 43–48. doi: https://doi.org/10.1144/sjg40010043
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New Sr and Nd isotope and rare earth element data obtained from primary apatite microphenocysts indicate that the Dob’s Linn metabentonites originated from a mildly depleted mantle source, probably generated in a continental margin or back-arc basin environment. There is a small but notable reduction in crustal contamination of the source magmas through two graptolite zones (convolutus to sedwickii) indicated by a shift to higher ɛNd values. This shift is consistent with a magma chamber being periodically refilled with mantle-derived melts.