Geochemical Analysis of Paleoproterozoic Mafic Intrusions
Summary
The geochemical study of Paleoproterozoic mafic intrusions centres on the chemical and isotopic composition of gabbroic and ultramafic bodies emplaced between 2.5 and 2.0 billion years ago. These investigations employ major and trace element analyses, rare earth element patterns, and isotopic systems such as U-Pb, Sm-Nd and Re-Os to unravel magma sources, differentiation pathways and crustal contamination processes. The vertical and lateral variation of cumulate layers within layered intrusions records fractional crystallisation, magma replenishment and mixing events, while whole-rock and mineral compositions constrain thermal regimes and oxygen fugacity during emplacement. Integration of these data has illuminated the role of mantle plumes, large igneous provinces and intracratonic rifting in driving Proterozoic magmatism. Geochemical fingerprints further underpin metallogenic models for Ni-Cu-PGE, Cr and platinum-group element mineralisation, linking intrusive processes to ore deposition. Comparative analysis across cratonic domains offers insights into global tectonic evolution and the assembly of early supercontinents. Such research not only advances fundamental understanding of early Earth processes but also guides exploration for critical mineral resources.
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Geochemical Analysis of Paleoproterozoic Mafic Intrusions publication trend
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Technical terms
Mafic intrusion: a body of igneous rock rich in magnesium and iron, typically gabbroic in composition, formed by slow cooling of magma.
Ultramafic: describes igneous rocks with very high magnesium and iron content and low silica, for example peridotite or dunite.
U-Pb geochronology: a dating method using the decay of uranium to lead in zircon to determine rock age with high precision.
Sm-Nd isotope system: a tracer of mantle and crustal processes based on the radioactive decay of samarium to neodymium, used to infer magma source and evolution.
Oxygen fugacity (fO₂): a measure of the oxidising conditions during crystallisation, controlling iron valence and mineral assemblages in magmatic rocks.
References
- Paleoproterozoic Layered Intrusions of the Monchegorsk Ore District: Geochemistry and U–Pb, Sm–Nd, Re–Os Isotope Analysis. Minerals (2022).
- Magma feeding paleochannel in the Monchegorsk ore region: geochemistry, isotope U-Pb and Sm-Nd analysis (Kola region, Russia). Journal of Mining Institute (2022).
- The Lyavaraka Ultrabasic Complex, Serpentinite Belt, Kola Peninsula, Russia. Geosciences (2022).
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