Rubidium, strontium and the isotopic composition of strontium in ultramafic nodule minerals and host basalts

Details Rubidium, strontium and the isotopic composition of strontium in ultramafic nodule minerals and host basalts Rubidium, strontium and the isotopic composition of strontium in ultramafic nodule minerals and host basalts

Feb 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974gecoa..38..207s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 38, Issue 2, pp.207-216

Computer Science

13

Scientific paper

The concentrations of rubidium and strontium and the isotopic composition of strontium have been determined in minerals separated from ultramaflc nodules occurring in late Tertiary and Quaternary basalts of wide geographic distribution. Clinopyroxene, orthopyroxene and olivine from each of three Iherzolite nodules show a relatively wide range of 87 Sr/ 86 Sr disequilibrium and none of the minerals is in isotopic equilibrium with its host basalt. In two cases there is a correlation between 87 Sr/ 86 Sr and 87 Rb/ 86 Sr ratios of the nodule minerals, indicating apparent isochron relationships which may represent relict mantle events. Clinopyroxene and olivine from each of two wehrlite nodules are not in isotopic equilibrium, although the magnitude of the disequilibrium is smaller than that observed in the Iherzolite nodules. None of these ultramafic nodules can be a crystal cumulate from its host basalt, and it is doubtful that any type of genetic relationship exists. The strontium isotopic disequilibrium between nodule minerals seems to be a primary feature inherited from past mantle histories.

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