An evaluation of models of apatite compositional variability using apatite from the Middle Banded series of the Stillwater Complex, Montana
Article Abstract:
Apatites from the olivine-bearing zones, OB-III and OB-IV, of the Middle Banded series of the Stillwater Complex, Montana, show clear stratigraphic variations regarding the F-Cl-OH content. A fluid migration model involves the degassing of a Cl-rich volatile phase from the crystallizing liquid. This fluid migrated upsection thus crystallizing F-rich apatite in the lower portion. Apatite got gradually enriched in Cl with increase in height. The compositional data obtained from 89 samples from OB-III and Ob-IV are used to evaluate models for halogen fractionation in layered intrusions.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1996
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Evolution of Archaean southern Indian lithospheric mantle: a geochemical study of Proterozoic Agali-Coimbatore dykes
Article Abstract:
The Proterozoic Agali-Coimbatore (AC) dykes, south India, have been formed by the addition of melts and fluids to the mantle lithosphere and crusts formed in the south Indian shield. The mantle lithosphere probably formed in the Archaean and later stabilized due to crust formation. The magmas forming the dyke were tholeiitic partial melts rich in Fe. The main fractionating portion of the melt was orthopyroxene and clinopyroxene with olivine in the beginning part and plagioclase in the later part of crystallization. Nb and Ta have negative anomalies in the melts.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1995
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