Lead isotopic compositions of South Sandwich Island volcanic rocks and their bearing on magmagenesis in intra-oceanic island arcs

Details Lead isotopic compositions of South Sandwich Island volcanic rocks and their bearing on magmagenesis in intra-oceanic island arcs Lead isotopic compositions of South Sandwich Island volcanic rocks and their bearing on magmagenesis in intra-oceanic island arcs

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47..817b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 47, Issue 4, pp.817-822

Computer Science

15

Scientific paper

Pb isotope ratios have been measured in 12 volcanic rocks from the South Sandwich Islands. The ranges are 206 Pb / 204 Pb = 18.51-18.66; 207 Pb / 204 Pb = 15.55-15.64; 208 Pb / 204 Pb = 38.42-38.64. In 207 Pb / 204 Pb - 206 Pb / 204 Pb and 208 Pb / 204 Pb - 206 Pb / 204 Pb correlation diagrams, the South Sandwich data plot distinctly above the fields for ocean ridge basalts, and yield trends showing apparent mixing with a sedimentary end member similar to South Atlantic pelagic sediments as reported by and (1962) and this study. and (1971) have likewise shown that volcanics from the Lesser Antilles show mixing trends with North Atlantic sediments in Pb isotope correlation diagrams. The North Atlantic sediments have distinctly higher 206 Pb / 204 Pb and 208 Pb / 204 Pb ratios compared to the South Atlantic sediments. The parallel relationships between sediments and volcanic island arc rocks of the North and South Atlantic provide strong evidence for a component of Pb from subducted sediments in the lavas of the west Atlantic basin. In contrast to these data, lavas from the Mariana Arc in the western Pacific show little or no component of Pb from pelagic sediments. The reason for the different behaviors in the two settings is speculative.

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