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Serpentine Stability to Mantle Depths and Subduction-Related Magmatism
Abstract
Results of high-pressure experiments on samples of hydrated mantle rocks show that the serpentine mineral antigorite is stable to ∼720°C at 2 gigapascals, to ∼690°C at 3 gigapascals, and to ∼620°C at 5 gigapascals. The breakdown of antigorite to forsterite plus enstatite under these conditions produces 13 percent H 2 O by weight to depths of 150 to 200 kilometers in subduction zones. This H 2 O is in an ideal position for ascent into the hotter, overlying mantle where it can cause partial melting in the source region for calc-alkaline magmas at a depth of 100 to 130 kilometers and a temperature of ∼1300°C. The breakdown of antigorite in hydrated mantle produces an order of magnitude more H 2 O than does the dehydration of altered oceanic crust.
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Cited by
Experimentally based water budgets for dehydrating slabs and consequences for arc magma generation
Schmidt, M. W., & Poli, S. (1998) · Earth and Planetary Science Letters · doi:10.1016/s0012-821x(98)00142-3 · Cited by 1,935
Stern, R. J. (2002) · Reviews of Geophysics · doi:10.1029/2001rg000108 · Cited by 1,517
Subduction factory 1. Theoretical mineralogy, densities, seismic wave speeds, and H 2 O contents
Hacker, B. R., Abers, G. A., & Peacock, S. M. (2003) · Journal of Geophysical Research: Solid Earth · doi:10.1029/2001jb001127 · Cited by 914
An inverted continental Moho and serpentinization of the forearc mantle
Bostock, M. G., Hyndman, R. D., Rondenay, S., & Peacock, S. M. (2002) · Nature · doi:10.1038/417536a · Cited by 632
The Serpentinite Multisystem Revisited: Chrysotile Is Metastable
Evans, B. W. (2004) · International Geology Review · doi:10.2747/0020-6814.46.6.479 · Cited by 613
Metadata
- Authors
- Ulmer, P., & Trommsdorff, V.
- Venue
- Science
- Published
- 1995-05-12
- Volume
- 268
- Issue
- 5212
- Pages
- 858-861
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2041895575
- Cited by
- 1,139
- References
- 0
- FWCI
- 11.56
- Type
- journal article
- Language
- en
- Open access
- closed
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