Other
Scientific paper
Mar 1964
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964gecoa..28..291m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 28, Issue 3, pp.291-303
Other
4
Scientific paper
Three series of volcanic rocks (pigeonitic, hypersthenic, and alkali rocks) are investigated as to their isotopic compositions of lead. Each series falls close to a characteristic line with negative trend in the 206 Pb/ 207 Pb vs. 207 Pb/ 208 Pb diagram. As fractional crystallization does not cause changes in the isotopic composition of lead, this characteristic trend line can be interpreted as indicating the difference in the original sources of these three series. Meanwhile, the difference within the same series suggests that magmatic differentation did not always proceed under the closed condition with respect to lead and the addition of lead more or less enriched in recent radiogenic lead took place. On the other hand, it is shown that the increase of content of lead is accompanied very commonly by the increase in the abundance ratio 206 Pb/ 207 Pb. This seems to suggest that the addition of exogenous (probably crustal) lead took place during the passage of magma to the surface even in the series believed to be free from contamination regarding the major chemical components. According to the interpretation in terms both of zone melting and of systematic variation of radiogenic lead in the crust and mantle, the depth of the original source is inferred to be in the order of alkali olivine basalt > high-alumina basalt (?) > tholeiite. The experimental method (Masuda, 1962) employed in this study consists of separation of lead by heating with carbon, purification by electrodeposition, and preparation of tetramethyl lead followed by mass spectrometry.
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