Rare earth and trace element geochemistry of a fragment of Jurassic seafloor, Point Sal, California

Details Rare earth and trace element geochemistry of a fragment of Jurassic seafloor, Point Sal, California Rare earth and trace element geochemistry of a fragment of Jurassic seafloor, Point Sal, California

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41.1419m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 41, Oct. 1977, p. 1419-1430.

Physics

3

Abundance, Geochemistry, Marine Environments, Ocean Bottom, Rare Earth Elements, Rocks, Trace Elements, Basalt, Fragments, Igneous Rocks, Lava, Metamorphic Rocks, Olivine, Pyroxenes, Sea Water

Scientific paper

Rocks from an ophiolite suite once on the seafloor were analyzed for rare earth elements (REE), Sc, Co, Na2O, Cr, Zn and FeO. Strontium isotope exchange noted in some of the lavas is attributed to basalt-seawater interaction; the Ce abundance in smectite- and zeolite-bearing lavas may also be due to prolonged exposure to seawater. The higher grades of metamorphic rock, however, show no variation from the usual flat or slightly light REE depleted profiles. Plutonic igneous rock, all light REE depleted, have total REE abundances varying by a factor of 100 between the dunites and diorites. In order of decreasing REE abundance are hornblende, clinopyroxene, plagioclase, orthopyroxene and olivine. Calculations of REE contents of liquids in equilibrium with early cumulative clinopyroxenes suggest that the parent to the stratiform sequence was more depleted in light REE than the parent to the lava pile.

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