Accession Number : AD0642344

Title :   RARE EARTH FRACTIONATION IN HAWAIIAN VOLCANIC ROCKS.

Descriptive Note : Doctoral thesis,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF GEOLOGY AND GEOPHYSICS

Personal Author(s) : Schilling,Jean-Guy

Report Date : AUG 1966

Pagination or Media Count : 395

Abstract : The procedure for determination of the rare earth elements and yttrium utilizing tracer-monitored group separation, neutron activation and carrier-free partition chromatography developed by Volfovsky et al. (1963) was revised and improved. Using this improved procedure, rare earth and yttrium abundances were measured in twenty Hawaiian lavas of known chemical and mineralogical composition, one peridotite inclusion from Salt Lake Crater, Oahu, and one olivine-rich nodule and its host 1801 basalt flow from Hualalai, Hawaii, and a diabase from Oahu. When comparing the rare earths, element by element, in the twenty lavas, to a low potassium olivine tholeiite, four distinct groupings were observed. The origin and genetic relationships of these different groups are discussed in the light of their rare earth patterns, mineral patterns from other localities, experimental petrology, theoretical and geochemical reasoning. Possible processes operative in the formation of these lavas, such as fractional crystallization, partial melting, fractional melting, limestone syntexis and fractional resorption are explored. The origin of the ultramafic inclusions is also briefly discussed.

Descriptors :   (*GEOCHEMISTRY, *IGNEOUS ROCK), (*RARE EARTH ELEMENTS, DISTILLATION), HAWAII, ROCK, BASALT, DETERMINATION, NEUTRON ACTIVATION, CRYSTALLIZATION

Subject Categories : Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE