Pb isotopes of Gorgona Island (Colombia): isotopic variations correlated with magma type

Details Pb isotopes of Gorgona Island (Colombia): isotopic variations correlated with magma type Pb isotopes of Gorgona Island (Colombia): isotopic variations correlated with magma type

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..67..186d&link_type=abstract

Earth and Planetary Science Letters, Volume 67, Issue 2, p. 186-190.

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Scientific paper

Lead isotopic results obtained on komatiites and basalts from Gorgona Island provide evidence of large isotopic variations within a restricted area (8 × 2.5 km). The variations are correlated with differences in volcanic rock type. The highest isotopic ratios (206Pb/204Pb ~ 19.75) correspond to tholeiites which make up most of the island. The lowest ratios (18.3) correspond to the komatiites of the west coast of the island. Other rock types (komatiites of the east coast, K-tholeiites, picrites and tuffs) have isotopic characteristics intermediate between these two extreme values. These results are explained by the existence of two distinct mantle source regions, and by mixing or contamination between them.
Corning Glass Works, Corning, NY 14830, U.S.A.

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