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The Role of Water in Generating the Calc-alkaline Trend: New Volatile Data for Aleutian Magmas and a New Tholeiitic Index
Abstract
The origin of tholeiitic (TH) versus calc-alkaline (CA) magmatic trends has long been debated. Part of the problem stems from the lack of a quantitative measure for the way in which a magma evolves. Recognizing that the salient feature in manyTH^CA discrimination diagrams is enrichment in Fe during magma evolution, we have developed a quantitative index of Fe enrichment, the Tholeiitic Index (THI):THIFe4·0/Fe8·0, where Fe4·0 is the average FeO* concentration of samples with 41wt % MgO, and Fe8·0 is the average FeO * at 81wt % MgO. Magmas withTHI41 have enriched in FeO * during differentiation from basalts to andesites and are tholeiitic; magmas with THI51 are calc-alkaline. Most subduction zone volcanism is CA, but to varying extents; the THI expresses the continuum of Fe enrichment observed in magmatic suites in all tectonic settings.To test various controls on the develop-ment of CA trends, we present new magmatic water measurements
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Citations
Cites
The chemical composition of subducting sediment and its consequences for the crust and mantle
Plank, T., & Langmuir, C. H. (1998) · Chemical Geology · doi:10.1016/s0009-2541(97)00150-2 · Cited by 3,499
Self-citationRAPP, R. P., & WATSON, E. B. (1995) · Journal of Petrology · doi:10.1093/petrology/36.4.891 · Cited by 3,329
Cited by
Plank, T., & Manning, C. E. (2019) · Nature · doi:10.1038/s41586-019-1643-z · Cited by 494
Self-citationCrustal 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
Plate tectonics and continental basaltic geochemistry throughout Earth history
Keller, B., & Schoene, B. (2018) · Earth and Planetary Science Letters · doi:10.1016/j.epsl.2017.10.031 · Cited by 173
Changing tectonic settings through time: Indiscriminate use of geochemical discriminant diagrams
Condie, K. (2015) · Precambrian Research · doi:10.1016/j.precamres.2015.05.004 · Cited by 127
Metadata
- Authors
- Zimmer, M. M., Plank, T., Hauri, E. H., Yogodzinski, G. M., Stelling, P., Larsen, J., Singer, B., Jicha, B., Mandeville, C., & Nye, C. J.
- Venue
- Journal of Petrology
- Publisher
- Oxford University Press (OUP)
- Published
- 2010-11-18
- Volume
- 51
- Issue
- 12
- Pages
- 2411-2444
- ISSN
- 0022-3530 (ISSN-L)
- 1460-2415
- OpenAlex
- W2100957263
- Cited by
- 357
- References
- 2
- FWCI
- 9.04
- Type
- journal article
- Language
- en
- Open access
- closed
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- Zimmer, M. M., Plank, T., Hauri, E. H., Yogodzinski, G. M., Stelling, P., Larsen, J., Singer, B., Jicha, B., Mandeville, C., & Nye, C. J. (2010). The Role of Water in Generating the Calc-alkaline Trend: New Volatile Data for Aleutian Magmas and a New Tholeiitic Index. Journal of Petrology. https://doi.org/10.1093/petrology/egq062
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