首页|A paradigm shift in our understanding of the solidification of layered basaltic intrusions: non-sequential magma injection, turbulent mixing, and the origin of chromitites
A paradigm shift in our understanding of the solidification of layered basaltic intrusions: non-sequential magma injection, turbulent mixing, and the origin of chromitites
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Layered basaltic intrusions, such as the Rustenburg Layered Suite (RLS), are the fossilised remnants of crustal magma chambers, and host some of Earth's largest known platinum-group element (PGE), chromium, and vanadium ore deposits. Deciphering the origin of these ore deposits depends on an understanding of the magmatic processes that operated to produce the first order macrorhythmic igneous layering. The 'traditional' view is that layered intrusions are formed by the sequential injection of magma, and its solidification as an upwardly (sequential) aggrading crystal pile by either crystal settling or in situ crystallisation. Sequential solidification implies that younger layers are emplaced on top of older layers in a large 'tank' of silicate magma. The mass balance problem of chromitites (and stratiform PGE deposits) offers support to this concept of a large magma tank. [1] This is based on the weak assumption that individual layers of chromitite (in the RLS) are laterally continuous for 10-100 s of kilometres.
Reza Maghdour-Mashhour、Ben Hayes
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School of Geosciences, University of the Witwatersrand, Johannesburg, South Africa
2022
Transactions of the Institutions of Mining and Metallurgy
NSTL
