Ten kilometers ascent of porphyry Cu (Au, Mo)-forming fluids in the Sanjiang region, China DOI Creative Commons
Jia Chang, Andreas Audétat, Thomas Pettke

et al.

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: March 8, 2025

Porphyry-type Cu (Mo, Au) deposits are among the economically most important ore resources. The depth and mode of ore-forming fluid exsolution from their source magmas has remained poorly constrained. Here, we studied 36 magmatic rocks six mineralized systems in Sanjiang region southwestern China. Melt inclusions trapped phenocrysts mineralizing, felsic strongly depleted Cl, S, metals. Petrographic evidence, apatite volatile contents, mass balance calculations suggest that this depletion was caused by aqueous fluids, which extracted 63‒97% metals originally present magmas. Three independent geobarometers reveal all major crystallized within pressure range 0.3‒0.5 GPa. These results show fluids exsolved at mid- to upper crustal depths ~10‒20 km, rather than crystallizing entirely crust or directly ascending lower crust. thus had transport metal S endowments over a vertical distance ~10 km site precipitation, likely first via bubbles suspended porphyry magmas, then through an interconnected network. Porphyry derive exceptionally large tonnages fluids. Samples Sanjiang, China, these how were focused formation

Language: Английский

Ten kilometers ascent of porphyry Cu (Au, Mo)-forming fluids in the Sanjiang region, China DOI Creative Commons
Jia Chang, Andreas Audétat, Thomas Pettke

et al.

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: March 8, 2025

Porphyry-type Cu (Mo, Au) deposits are among the economically most important ore resources. The depth and mode of ore-forming fluid exsolution from their source magmas has remained poorly constrained. Here, we studied 36 magmatic rocks six mineralized systems in Sanjiang region southwestern China. Melt inclusions trapped phenocrysts mineralizing, felsic strongly depleted Cl, S, metals. Petrographic evidence, apatite volatile contents, mass balance calculations suggest that this depletion was caused by aqueous fluids, which extracted 63‒97% metals originally present magmas. Three independent geobarometers reveal all major crystallized within pressure range 0.3‒0.5 GPa. These results show fluids exsolved at mid- to upper crustal depths ~10‒20 km, rather than crystallizing entirely crust or directly ascending lower crust. thus had transport metal S endowments over a vertical distance ~10 km site precipitation, likely first via bubbles suspended porphyry magmas, then through an interconnected network. Porphyry derive exceptionally large tonnages fluids. Samples Sanjiang, China, these how were focused formation

Language: Английский

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