Rare earth and trace element geochemistry of metabasalts from the Point Sal ophiolite, California

Details Rare earth and trace element geochemistry of metabasalts from the Point Sal ophiolite, California Rare earth and trace element geochemistry of metabasalts from the Point Sal ophiolite, California

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..37..203m&link_type=abstract

Earth and Planetary Science Letters, Volume 37, Issue 2, p. 203-215.

Physics

9

Scientific paper

The Point Sal ophiolite, California, contains a volcanic pile of pillowed and massive basalts and keratophyres that exhibit a downward change in metamorphic facies, i.e., zeolite to greenschist. Analyses of 14 stratigraphically sequential lavas reveals the existence of three lava types: (1) highly fractionated plagioclase phyric lavas at the base of the lava pile; (2) clinopyroxene-plagioclase phyric lavas at different eruptive levels throughout the pile, and (3) olivine-clinopyroxene phyric lavas (low ΣREE) in the midst of the eruptive suite. The upper portion of the lava pile contains lavas with chondritic to slightly light-REE-depleted profiles (La = 3.5-13.0× chondrite) and negative Ce anomalies. The lower part of the lava pile contains lavas with light-REE-depleted profiles (La = 1.7-28.0× chondrite), negative Eu anomalies, but no negative Ce anomalies. Application of fractionation laws to the olivine-clinopyroxene phyric lavas (approximations of initial mantle melts) verifies that the fractionation process involved olivine-clinopyroxene and plagioclase. Consideration of this and the eruptive sequence allows semiquantitative verification of an origin for the Point Sal lavas by low-pressure fractionation of multiple chambers of olivine basalt.

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