Possible spatial variability in the Selwyn Block of Central Victoria: evidence from Late Devonian felsic igneous rocks

作者: J. D. Clemens , M. A. Elburg

DOI: 10.1080/08120099.2016.1158736

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摘要: ABSTRACTThe Neoproterozoic to Cambrian Selwyn Block in Central Victoria forms the mainly unexposed basement Paleozoic metasediments, granitic rocks and felsic volcanic complexes of Melbourne Zone Lachlan Orogen. The Late Devonian are largely products partial melting Block, their chemistry implies that sources were most probably arc-related andesite, dacite, volcaniclastic greywackes some pelites. When plotted against median longitudes plutons complexes, average values for 87Sr/86Srt ϵNdt (at 370 Ma) reveal broad trends interpreted reflect possible compositional and/or age structure Block. Assuming real, from W E, I-type progressively less crustally evolved, younging eastward. S-type show no trend ϵNdt, suggesting there was efficient sediment mixing. values, however, become more evolved eastward (opposite sense th...

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