Modes of Occurrences and Geochemical Characteristics of Ilmenite and Magnetite of the North Suoi Cun Lherzolite and Gabbroid

Abstract

Modes of occurrences and geochemical characteristics of ilmenite and magnetite in the
North Suoi Cun ultramafic rocks were studied to understand source, formation and evolution of
magma chamber. The northern Suoi Cun ultramafic block consists of plagiolherzolite and olivine
melano-gabbro. The Plagiolherzolite and olivine melano-gabbro consist of large amounts of olivine
and pyroxene, while lesser amounts of plagioclase and sulfit minerals and small amounts of biotite,
chromspinel, ilmenite and magnetite were found. The results suggest that: a/ There are two types of
ilmenite formed in two distinct stages: Early Mg-rich ilmenite was formed at intermediate magma
chamber and latter Mn-rich ilmenite was formed at crystallized magma chamber; b/ Original magma
of Suoi Cun plagiolherzolite and melano gabbroid was derived from sub-continental lithospheric
mantle; c/ magnetite was formed at latter stage by two processes: serpentinization and alteration of
early sulfit minerals.
Keywords

Ilmenite, magnetite, lherzolite, gabbroid, Suối Củn

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