The DOI matches its Crossref record; 3 of the 3 references it cites were found in a registry or an index.
HIGH Sr/Y ARC MAGMAS AND PORPHYRY Cu Mo Au DEPOSITS: JUST ADD WATER
Abstract
Porphyry Cu ± Mo ± Au deposits are commonly associated with intermediate composition arc-related igneous rocks with high Sr/Y (and La/Yb) ratios, and such rocks are equated by some researchers with melts derived from subducted oceanic crust undergoing eclogite facies metamorphism (“adakites”). However, similar geochemical characteristics are readily developed in normal asthenospheric mantle wedge-derived magmas by fractionation of amphibole and/or garnet, and/or by interaction with crustal materials during ascent through the upper plate lithosphere. While there is widespread evidence for such fractionation and contamination processes in porphyry magmas, there is little direct evidence for an origin by slab melting. The enhanced fertility of arc magmas relates primarily to their high water content, which is required for the formation of magmatic-hydrothermal systems upon shallow crustal emplacement. Magmatic water contents >4 wt percent H 2 O cause abundant amphibole (± garnet) fractionation but suppression of plagioclase crystallization at deep crustal levels, resulting in increasing Sr/Y and La/Yb ratios with differentiation, commonly into “adakitic” ranges, but not reflecting slab melting. Additional factors that affect arc magma fertility are relatively high oxidation states and sulfur content, but these are secondary to the requirement for sufficient water. Thus, arc magmatic suites with high Sr/Y ratios and evidence for the presence of hydrous phenocryst phases (hornblende and/or biotite) are indeed prospective for porphyry Cu ± Mo ± Au deposits, but only because these parameters indicate high magmatic water content.
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Cites
RAPP, R. P., & WATSON, E. B. (1995) · Journal of Petrology · doi:10.1093/petrology/36.4.891 · Cited by 3,329
Subduction factory: 4. Depth-dependent flux of H 2 O from subducting slabs worldwide
van Keken, P. E., Hacker, B. R., Syracuse, E. M., & Abers, G. A. (2011) · Journal of Geophysical Research · doi:10.1029/2010jb007922 · Cited by 949
Sen, C., & Dunn, T. (1994) · Contributions to Mineralogy and Petrology · doi:10.1007/bf00307273 · Cited by 860
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Sun, W., Huang, R.-F., Li, H., Hu, Y.-B., Zhang, C.-C., Sun, S.-J., Zhang, L.-P., Ding, X., Li, C.-Y., Zartman, R. E., et al. (2015) · Ore Geology Reviews · doi:10.1016/j.oregeorev.2014.09.004 · Cited by 621
The link between reduced porphyry copper deposits and oxidized magmas
Sun, W.-D., Liang, H.-Y., Ling, M.-X., Zhan, M.-Z., Ding, X., Zhang, H., Yang, X.-Y., Li, Y.-L., Ireland, T. R., Wei, Q.-R., et al. (2013) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2012.10.054 · Cited by 419
Crustal thickness control on Sr/Y signatures of recent arc magmas: an Earth scale perspective
Chiaradia, M. (2015) · Scientific Reports · doi:10.1038/srep08115 · Cited by 314
Origin of postcollisional magmas and formation of porphyry Cu deposits in southern Tibet
Wang, R., Weinberg, R. F., Collins, W. J., Richards, J. P., & Zhu, D.-C. (2018) · Earth-Science Reviews · doi:10.1016/j.earscirev.2018.02.019 · Cited by 264
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Metadata
- Authors
- Richards, J. P.
- Venue
- Economic Geology
- Publisher
- Society of Economic Geologists, Inc.
- Published
- 2011-10-10
- Volume
- 106
- Issue
- 7
- Pages
- 1075-1081
- ISSN
- 0361-0128 (ISSN-L)
- 1554-0774
- OpenAlex
- W2324896590
- Cited by
- 602
- References
- 3
- FWCI
- 13.46
- Type
- journal article
- Language
- en
- Open access
- closed
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