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Cretaceous age, composition, and microstructure of pseudotachylyte in the Otage Schist, New Zealand

Barker, Shaun; Sibson, Richard H; Palin, J; Fitz Gerald, John; Reddy, Steven M.; Warr, Laurence; van der Pluijm, Ben


At Tucker Hill, in Central Otago, New Zealand, a series of pseudotachylyte veins are hosted in quartzofeldspathic schist. Chilled margins, microlites, flow banding, and the crystallisation of mineral phases absent from the host rock provide unequivocal evidence for melting during pseudotachylyte formation. Whole rock analyses of pseudotachylyte reveal c. 3 x enrichment of K2O, Ba, and Rb, and similar depletion of Na2O, CaO, Sr, and Eu, as compared to host schist. Formation age of...[Show more]

CollectionsANU Research Publications
Date published: 2010
Type: Journal article
Source: New Zealand Journal of Geology and Geophysics
DOI: 10.1080/00288301003631764


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