Nathwani, Chetan L., Loader, Matthew A., Wilkinson, Jamie J., Buret, Yannick, Sievwright, Robert H., Hollings, Pete (2020) Multi-stage arc magma evolution recorded by apatite in volcanic rocks. Geology, 48 (4) 323-327 doi:10.1130/g46998.1
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Multi-stage arc magma evolution recorded by apatite in volcanic rocks | ||
| Journal | Geology | ||
| Authors | Nathwani, Chetan L. | Author | |
| Loader, Matthew A. | Author | ||
| Wilkinson, Jamie J. | Author | ||
| Buret, Yannick | Author | ||
| Sievwright, Robert H. | Author | ||
| Hollings, Pete | Author | ||
| Year | 2020 (April 1) | Volume | 48 |
| Issue | 4 | ||
| Publisher | Geological Society of America | ||
| DOI | doi:10.1130/g46998.1Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 144128 | Long-form Identifier | mindat:1:5:144128:8 |
| GUID | 0 | ||
| Full Reference | Nathwani, Chetan L., Loader, Matthew A., Wilkinson, Jamie J., Buret, Yannick, Sievwright, Robert H., Hollings, Pete (2020) Multi-stage arc magma evolution recorded by apatite in volcanic rocks. Geology, 48 (4) 323-327 doi:10.1130/g46998.1 | ||
| Plain Text | Nathwani, Chetan L., Loader, Matthew A., Wilkinson, Jamie J., Buret, Yannick, Sievwright, Robert H., Hollings, Pete (2020) Multi-stage arc magma evolution recorded by apatite in volcanic rocks. Geology, 48 (4) 323-327 doi:10.1130/g46998.1 | ||
| In | (2020, April) Geology Vol. 48 (4) Geological Society of America | ||
| Abstract/Notes | Abstract Protracted magma storage in the deep crust is a key stage in the formation of evolved, hydrous arc magmas that can result in explosive volcanism and the formation of economically valuable magmatic-hydrothermal ore deposits. High magmatic water content in the deep crust results in extensive amphibole ± garnet fractionation and the suppression of plagioclase crystallization as recorded by elevated Sr/Y ratios and high Eu (high Eu/Eu*) in the melt. Here, we use a novel approach to track the petrogenesis of arc magmas using apatite trace element chemistry in volcanic formations from the Cenozoic arc of central Chile. These rocks formed in a magmatic cycle that culminated in high-Sr/Y magmatism and porphyry ore deposit formation in the Miocene. We use Sr/Y, Eu/Eu*, and Mg in apatite to track discrete stages of arc magma evolution. We apply fractional crystallization modeling to show that early-crystallizing apatite can inherit a high-Sr/Y and high-Eu/Eu* melt chemistry signature that is predetermined by amphibole-dominated fractional crystallization in the lower crust. Our modeling shows that crystallization of the in situ host-rock mineral assemblage in the shallow crust causes competition for trace elements in the melt that leads to apatite compositions diverging from bulk-magma chemistry. Understanding this decoupling behavior is important for the use of apatite as an indicator of metallogenic fertility in arcs and for interpretation of provenance in detrital studies. | ||
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