Zr/Hf and Dy/Eu ratios in zircons of basic igneous rocks of alkaline continental series

Journal Article · Sat Dec 01 04:00:00 EST 1973 · Chem. Geol., v. 12, no. 4, pp. 271-279

OSTI ID:4315049

Carbonnel, J P; Deschamps, N; Jaffreizic, H

Non-destructive neutron-activation analysis of Zr and Hf in gem-zircons from undersaturated basic rocks of old shields: French Central Massif, Indochina, Madagascar, Atakor (Sahara). The Zr contents are close to the theoretical value in zircon; the Hf contents vary from 0.51 to 0.74%. Statistically the Hf averages are identical for the main deposits studied. The Zr/Hf ratio is 75 for the European and Asiatic deposits and 80 for the African shield. The Dy/Eu ratio has the same homogeneity in the main deposits. These values tend to sustain the following hypothesis: zircons occurred during an early paragenesis of undersaturated alkaline magmas. (auth)

• Research Organization: Univ., Paris
• NSA Number: NSA-29-029002
• OSTI ID: 4315049
• Journal Information: Chem. Geol., v. 12, no. 4, pp. 271-279, Journal Name: Chem. Geol., v. 12, no. 4, pp. 271-279; ISSN CHGEA
• Country of Publication: Country unknown/Code not available
• Language: French

Related Subjects

*DYSPROSIUM-- ACTIVATION ANALYSIS
*EUROPIUM-- ACTIVATION ANALYSIS
*HAFNIUM-- ACTIVATION ANALYSIS
*ZIRCON-- ACTIVATION ANALYSIS
*ZIRCONIUM-- ACTIVATION ANALYSIS
MULTI-ELEMENT ANALYSIS
N40110* --Chemistry--Analytical & Separations Chemistry-- Activation & Nuclear Reaction Procedures
NEUTRON REACTIONS
NONDESTRUCTIVE ANALYSIS
QUANTITATIVE CHEMICAL ANALYSIS
ROCKS