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Mohr, Peter (1991) Cryptic Sr and Nd isotopic variation across the Leinster Granite, southeast Ireland. Geological Magazine, 128 (3) 251-256 doi:10.1017/s0016756800022093

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Reference TypeJournal (article/letter/editorial)
TitleCryptic Sr and Nd isotopic variation across the Leinster Granite, southeast Ireland
JournalGeological Magazine
AuthorsMohr, PeterAuthor
Year1991 (May)Volume128
Issue3
PublisherCambridge University Press (CUP)
DOIdoi:10.1017/s0016756800022093Search in ResearchGate
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Mindat Ref. ID255034Long-form Identifiermindat:1:5:255034:7
GUID0
Full ReferenceMohr, Peter (1991) Cryptic Sr and Nd isotopic variation across the Leinster Granite, southeast Ireland. Geological Magazine, 128 (3) 251-256 doi:10.1017/s0016756800022093
Plain TextMohr, Peter (1991) Cryptic Sr and Nd isotopic variation across the Leinster Granite, southeast Ireland. Geological Magazine, 128 (3) 251-256 doi:10.1017/s0016756800022093
In(1991, May) Geological Magazine Vol. 128 (3) Cambridge University Press (CUP)
Abstract/NotesAbstractRb–Sr isotope whole-rock data from the end-Caledonian Leinster Batholith define an errorchron age of 464±26 Ma, appreciably older than the accepted emplacement age of c. 405 Ma. This anomalously old age is the consequence of a highly variable initial Sr isotopic composition. Initial Nd ratios and TDM model ages also show a wide range of values. However, these isotopic variations are neither randomly distributed nor related to petrographic changes but instead reflect, in a simple way, geographic position about the axis of the batholith. The isotopic pattern revealed in the Leinster Batholith means that isochron ages obtained from S-type granites may be largely dependent on the sampling scheme adopted. The variable isotopic composition of the granite most likely resulted from either a heterogeneous metasedimentary source or hybridization of coeval, dominantly crustal melts.


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