Distinct magma evolution processes control the formation of porphyry Cu–Au deposits in thin and thick arcs

نویسندگان

چکیده

Porphyry Cu–Au deposits are the major global source of copper, an essential metal for green transition, and a significant gold. They occur both in thick continental thin oceanic arcs at depths between ∼1 ∼6 km above parental magma chambers situated ∼5–15 depth. Although it is believed that precipitation processes these same arcs, not clear why porphyry two environments display different Cu Au endowments Au/Cu ratios. Using mass balance petrological modeling, I argue form by distinct magmatic evolution precursors. In tied to deep crust build-up large volumes magmas, volatiles metals. These magmas H2O-undersaturated need rise shallow level exsolve fluids contrast, little differentiated mantle-derived directly crustal levels where they pathways generation ultimately controlled arc thicknesses environments, even though actual similar. The model discussed here may stimulate development new tools exploration arcs.

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ژورنال

عنوان ژورنال: Earth and Planetary Science Letters

سال: 2022

ISSN: ['1385-013X', '0012-821X']

DOI: https://doi.org/10.1016/j.epsl.2022.117864