Igneous rocks of the Brook Street Terrane, New Zealand: implications for Permian tectonics of eastern Gondwana and magma genesis in modern intra-oceanic volcanic arcs
The Brook Street Terrane of South Island, New Zealand, is a remnant of a primitive intra-oceanic arc system of Permian age. The terrane consists largely of volcanogenic sequences that contain plagioclase- and clinopyroxene-phyric basalts, high-MgO ankaramite dikes, and basaltic to andesitic volcaniclastic and sedimentary rocks. Dacites and rhyolites are relatively rare. Intruding the sequences are thick dolerite dikes, trondhjemite plutons, and numerous small cumulate complexes. The cumulate...[Show more]
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|Source:||New Zealand Journal of Geology and Geophysics|
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