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
Reference Type | Journal (article/letter/editorial) | ||
---|---|---|---|
Title | Cryptic Sr and Nd isotopic variation across the Leinster Granite, southeast Ireland | ||
Journal | Geological Magazine | ||
Authors | Mohr, Peter | Author | |
Year | 1991 (May) | Volume | 128 |
Issue | 3 | ||
Publisher | Cambridge University Press (CUP) | ||
DOI | doi:10.1017/s0016756800022093Search in ResearchGate | ||
Generate Citation Formats | |||
Mindat Ref. ID | 255034 | Long-form Identifier | mindat:1:5:255034:7 |
GUID | 0 | ||
Full Reference | 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 | ||
Plain Text | 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 | ||
In | (1991, May) Geological Magazine Vol. 128 (3) Cambridge University Press (CUP) | ||
Abstract/Notes | AbstractRb–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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