Petrographic and geochemical characteristics of the Nui Chua pegmatoid mafic-ultramafic series, Northern Vietnam: Significance in petrogenesis and Fe-Ti-V metallogenesis

Pham Thi Dung; Tran Tuan Anh; Tran Quoc Hung; Tran Trong Hoa; R. A. Shelepaev; Nguyen Hoang; Tran Quoc Cong

doi:10.15625/0866-7187/15720

Author affiliations

Authors

Pham Thi Dung Institute of Geological Sciences, VAST, Hanoi, Vietnam
Tran Tuan Anh Institute of Geological Sciences, VAST, Hanoi, Vietnam
Tran Quoc Hung Institute of Geological Sciences, VAST, Hanoi, Vietnam
Tran Trong Hoa Institute of Geological Sciences, VAST, Hanoi, Vietnam
R. A. Shelepaev Sobolev Institute of Geology and Mineralogy, Siberian Branch of the RAS, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Nguyen Hoang Institute of Geological Sciences, VAST, Hanoi, Vietnam
Tran Quoc Cong Institute of Geological Sciences, VAST, Hanoi, Vietnam

DOI:

https://doi.org/10.15625/0866-7187/15720

Keywords:

Mafic-ultramafic, pegmatoid rocks, Fe-Ti oxide ore, Nui Chua intrusive complex, Northern Vietnam

Abstract

The pegmatoid intrusions of the Nui Chua complex are one of the important mafic-ultramafic intrusive series associated with Fe-Ti-V ores in northern Vietnam. These intrusions consist of plagiowebsterite, clinopyroxenite, melanogabbronorite, mesogabbro, gabbronorite, and leucogabbronorite. The Fe-Ti oxide ores being massive or disseminated appear layered or veined in pegmatoid rocks. The geochemical characteristics of pegmatoid rocks are rich in Fe, Ti, V and poor Mg; their HREE are higher than LREE, with [La/Yb]N of 0.49 to 0.91 (average: 0.67), showing negative anomalies at Nb, Ta, Th, U, Sr, Zr and positive anomalies at Cs, Ti, and K. The chemical composition and distribution characteristics of trace and rare earth elements of mafic and ultramafic rocks show that they share the same magma source. Having the same geochemical tendency of intrusive formations, Fe-Ti oxide ores are magmatic origin associated with intrusive pegmatoid rocks. The pegmatoid rocks of the Nui Chua complex and Fe-Ti oxide ores are formed as a product of the fractional crystallization of Fe-Ti-rich residual melts after crystallization of the layered rocks.

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