Computer Science
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..95..130k&link_type=abstract
Earth and Planetary Science Letters, Volume 95, Issue 1-2, p. 130-140.
Computer Science
8
Scientific paper
Discordant U-Pb zircon isotopic data from amphibolite facies orthogneisses of the Charleston Metamorphic Group, western South Island, New Zealand, define a lower intercept age of 114 +/- 18 m.y. that is interpreted as the crystallization age of the orthogneiss magmas. The upper intercept age of 1026 +/- 97 m.y. reflects inherited components of Precambrian zircon derived from the source region of the magmas. The age, and whole rock chemical characteristics, indicate that the orthogneisses are part of the same phase of Early Cretaceous magmatic activity that produced voluminous arc-related calc-alkaline plutonic rocks throughout western South Island. Previously published K-Ar and Rb-Sr mineral ages indicate uplift and cooling of the Charleston Metamorphic Group to less than 400°C by 110-90 m.y. This uplift occurred as a consequence of low-angle normal faulting related to the Late Cretaceous breakup of Gondwana, and suggests that regional continental lithospheric extension was an important aspect of the Cretaceous tectonic evolution of the region.
Kimbrough David L.
Tulloch Andrew J.
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