Geothermal and petrogenetic implications of the analysis of the distributional relationship between thorium and uranium

作者: Akimasa Masuda

DOI: 10.1016/0040-1951(65)90055-7

关键词: GeologyBasaltThoriumUraniumGeochemistryOlivineIgneous rockPartial meltingGeothermal gradientMantle (geology)Earth-Surface ProcessesGeophysics

摘要: Abstract Assuming that 1. (a) the earth encountered a complete melting at its primeval age 2. (b) mantle grew upwards from bottom through fixation of crystals segregated melt, and 3. (c) partition coefficients for minor elements between melt only forming were approximately constant process growth, distribution radioactive heat sources was estimated as function depth within earth. According to calculation, total source plus crust is 58–66% calculated perfect chondritic model, 18.5–22% reserved below 600 km in mantle. The original depths tholeiite, high-alumina basalt, alkali olivine each Japan, estimated. considerations uranium thorium, coupled with interpretations lead-isotope data (Masuda, 1964a), suggest possibility tholeiite Japan corresponds aggregate separated while basalt could be generated by partial basalt. necessary calculation thorium obtained analysis determinations Heier Rogers (1963) (1963).

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