Physics
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44.2125h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 44, Dec. 1980, p. 2125-2143.
Physics
28
Basalt, Glass, Ocean Bottom, Planetary Evolution, Trace Elements, Earth Mantle, Neutron Activation Analysis, Noble Metals, Petrology
Scientific paper
Seven documented and fresh glassy selvages from ocean floor basalt pillows were analyzed for trace elements including Ag, Au, Bi, Br, Ni, Pd, and Zn using radiochemical activation analysis. Glasses from DSDP leg 24, site 238 in the Indian Ocean have a trace element pattern which reflects secondary processes at a shallow depth. Chemical fractionations in petrogenesis of tholeiitic basalts indicate that (Ir, Os), Au, Pd, Ni, and Re are strongly fractionated in igneous processes; the unfractionated chondritic mantle pattern thus imposes constraints on mantle evolution models. Finally, the limited Rb/Cs fractionation in oceanic tholeiites reflects the low abundance of volatiles and hydrous silicates in normal ocean ridge basalts.
Hertogen Jan
Janssens Marie-Josée
Palme Herbert
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