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Cooper & Richards 1966

Cooper, J.A. and Richards, J.R. (1966). Lead isotopes and volcanic magmas. Earth and Planetary Science Letters 1(5): 259-269.

Lead isotope measurements on 25 modern volcanic extrusives (Hawaii 18, Japan 5, Reunion Island 2) indicaate a complicated geological history for the source region. The key assumption is that the sources of all volcanics may be treated as a single unit with respect to time variations of U and Pb abundances. Attempts at regression analysis are inconclusive, and interpretation by comparison with synthetic limiting fields suggests that the first differentiation of the mantle occurred 2,800 m.y. ago. A possible mechanism for heterogeneous redistribution is discussed. The fact that massive lead orebodies appear to have a homogeneous source may mean that concentration takes place at greater depths than magma formation.

Keywords
composition; Czechoslovakia; differentiation; East Pacific Ocean, Islands; genesis; geochemistry; Hawaii; history; igneous rocks;, isotopes; lead; lead isotopes; lead ores; Lead-isotope abundance;, Lead-isotope content; lead-isotope data; lead-isotope, measurements; magmas; mantle; metal ores; metals; Oceania; ore, deposits; Polynesia; processes; ratios; redistribution; source, region; U/Pb ratio; United States; volcanic rocks, 05 Igneous and metamorphic petrology; 18 Solid-earth geophysics

Journal
Earth and Planetary Science Letters
http://www.elsevier.com/wps/product/cws_home/503328

Publisher
Elsevier Science
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