Excess europium content in precambrian sedimentary rocks and continental evolution

Details Excess europium content in precambrian sedimentary rocks and continental evolution Excess europium content in precambrian sedimentary rocks and continental evolution

May 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974gecoa..38..739j&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 38, Issue 5, pp.739-745

Computer Science

6

Scientific paper

We propose that the europium excess in Precambrian sedimentary rocks, relative to those of younger age is derived from volcanic rocks of ancient island arcs, which were the source materials for the sediments. Precambrian sedimentary rocks and present-day volcanic rocks of island arcs have similar REE patterns, total REE abundances and excess Eu, relative to the North American shale composite. The present upper crustal REE pattern, as exemplified by that of sediments, is depleted in Eu, relative to chondrites. This depletion is considered to be a consequence of development of a grandioritic upper crust by partial melting in the lower crust, which selectively retains europium.

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