Rare earth mobility in young arc-type volcanic rocks from northern New Zealand

Details Rare earth mobility in young arc-type volcanic rocks from northern New Zealand Rare earth mobility in young arc-type volcanic rocks from northern New Zealand

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.3951k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 56, Issue 11, pp.3951-3955

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Scientific paper

Samples of Late Cenozoic arc-type volcanic rocks from the Hauraki Volcanic Region in northern New Zealand show evidence for enrichment of the rare earth elements (REEs). These samples have variable to high La and Y abundances together with REE abundance patterns which are up to an order of magnitude higher than those considered typical of the suite as a whole. Scanning electron microscope imaging and analysis shows the presence of micron scale veins and patches containing REE-bearing phases. These observations are explained as the result of cryptic alteration processes which enrich the REEs but not other chemical components and which are probably the result of low temperature (<250°C) hydrothermal alteration.

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