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  1. Contributions to Mineralogy and Petrology
  2. Contributions to Mineralogy and Petrology : Volume 163
  3. Contributions to Mineralogy and Petrology : Volume 163, Issue 4, April 2012
  4. The beginnings of hydrous mantle wedge melting
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Contributions to Mineralogy and Petrology : Volume 171
Contributions to Mineralogy and Petrology : Volume 170
Contributions to Mineralogy and Petrology : Volume 169
Contributions to Mineralogy and Petrology : Volume 168
Contributions to Mineralogy and Petrology : Volume 167
Contributions to Mineralogy and Petrology : Volume 166
Contributions to Mineralogy and Petrology : Volume 165
Contributions to Mineralogy and Petrology : Volume 164
Contributions to Mineralogy and Petrology : Volume 163
Contributions to Mineralogy and Petrology : Volume 163, Issue 6, June 2012
Contributions to Mineralogy and Petrology : Volume 163, Issue 5, May 2012
Contributions to Mineralogy and Petrology : Volume 163, Issue 4, April 2012
A case for hornblende dominated fractionation of arc magmas: the Chelan Complex (Washington Cascades)
Experimental determination of F and Cl partitioning between lherzolite and basaltic melt
Petrogenesis of the Kaikomagatake granitoid pluton in the Izu Collision Zone, central Japan: implications for transformation of juvenile oceanic arc into mature continental crust
Magma plumbing beneath Anak Krakatau volcano, Indonesia: evidence for multiple magma storage regions
Sr and Pb isotopic disequilibrium between coexisting plagioclase and orthopyroxene in the Bushveld Complex, South Africa: microdrilling and progressive leaching evidence for sub-liquidus contamination within a crystal mush
The beginnings of hydrous mantle wedge melting
The effect of chemical composition and oxygen fugacity on the electrical conductivity of dry and hydrous garnet at high temperatures and pressures
The legacy of crystal-plastic deformation in olivine: high-diffusivity pathways during serpentinization
Crustal homogenization revealed by U–Pb zircon ages and Hf isotope evidence from the Late Cretaceous granitoids of the Agaçören intrusive suite (Central Anatolia/Turkey)
Contributions to Mineralogy and Petrology : Volume 163, Issue 3, March 2012
Contributions to Mineralogy and Petrology : Volume 163, Issue 2, February 2012
Contributions to Mineralogy and Petrology : Volume 163, Issue 1, January 2012
Contributions to Mineralogy and Petrology : Volume 162
Contributions to Mineralogy and Petrology : Volume 161
Contributions to Mineralogy and Petrology : Volume 160
Contributions to Mineralogy and Petrology : Volume 159
Contributions to Mineralogy and Petrology : Volume 158
Contributions to Mineralogy and Petrology : Volume 157
Contributions to Mineralogy and Petrology : Volume 156
Contributions to Mineralogy and Petrology : Volume 155
Contributions to Mineralogy and Petrology : Volume 154
Contributions to Mineralogy and Petrology : Volume 153
Contributions to Mineralogy and Petrology : Volume 152
Contributions to Mineralogy and Petrology : Volume 151
Contributions to Mineralogy and Petrology : Volume 150
Contributions to Mineralogy and Petrology : Volume 149
Contributions to Mineralogy and Petrology : Volume 148
Contributions to Mineralogy and Petrology : Volume 147
Contributions to Mineralogy and Petrology : Volume 146
Contributions to Mineralogy and Petrology : Volume 145
Contributions to Mineralogy and Petrology : Volume 144
Contributions to Mineralogy and Petrology : Volume 143
Contributions to Mineralogy and Petrology : Volume 142
Contributions to Mineralogy and Petrology : Volume 141
Contributions to Mineralogy and Petrology : Volume 140
Contributions to Mineralogy and Petrology : Volume 139
Contributions to Mineralogy and Petrology : Volume 138
Contributions to Mineralogy and Petrology : Volume 137
Contributions to Mineralogy and Petrology : Volume 136
Contributions to Mineralogy and Petrology : Volume 135
Contributions to Mineralogy and Petrology : Volume 134
Contributions to Mineralogy and Petrology : Volume 133
Contributions to Mineralogy and Petrology : Volume 132
Contributions to Mineralogy and Petrology : Volume 131
Contributions to Mineralogy and Petrology : Volume 130
Contributions to Mineralogy and Petrology : Volume 129
Contributions to Mineralogy and Petrology : Volume 128
Contributions to Mineralogy and Petrology : Volume 127
Contributions to Mineralogy and Petrology : Volume 126

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The beginnings of hydrous mantle wedge melting

Content Provider SpringerLink
Author Till, Christy B. Grove, Timothy L. Withers, Anthony C.
Copyright Year 2011
Abstract This study presents new phase equilibrium data on primitive mantle peridotite (0.33 wt% Na2O, 0.03 wt% K2O) in the presence of excess H2O (14.5 wt% H2O) from 740 to 1,200°C at 3.2–6 GPa. Based on textural and chemical evidence, we find that the H2O-saturated peridotite solidus remains isothermal between 800 and 820°C at 3–6 GPa. We identify both quenched solute from the H2O-rich fluid phase and quenched silicate melt in supersolidus experiments. Chlorite is stable on and above the H2O-saturated solidus from 2 to 3.6 GPa, and chlorite peridotite melting experiments (containing ~6 wt% chlorite) show that melting occurs at the chlorite-out boundary over this pressure range, which is within 20°C of the H2O-saturated melting curve. Chlorite can therefore provide sufficient H2O upon breakdown to trigger dehydration melting in the mantle wedge or perpetuate ongoing H2O-saturated melting. Constraints from recent geodynamic models of hot subduction zones like Cascadia suggest that significantly more H2O is fluxed from the subducting slab near 100 km depth than can be bound in a layer of chloritized peridotite ~ 1 km thick at the base of the mantle wedge. Therefore, the dehydration of serpentinized mantle in the subducted lithosphere supplies free H2O to trigger melting at the H2O-saturated solidus in the lowermost mantle wedge. Alternatively, in cool subduction zones like the Northern Marianas, a layer of chloritized peridotite up to 1.5 km thick could contain all the H2O fluxed from the slab every million years near 100 km depth, which suggests that the dominant form of melting below arcs in cool subduction zones is chlorite dehydration melting. Slab P–T paths from recent geodynamic models also allow for melts of subducted sediment, oceanic crust, and/or sediment diapirs to interact with hydrous mantle melts within the mantle wedge at intermediate to hot subduction zones.
Starting Page 669
Ending Page 688
Page Count 20
File Format PDF
ISSN 00107999
Journal Contributions to Mineralogy and Petrology
Volume Number 163
Issue Number 4
e-ISSN 14320967
Language English
Publisher Springer-Verlag
Publisher Date 2011-10-02
Publisher Place Berlin/Heidelberg
Access Restriction One Nation One Subscription (ONOS)
Subject Keyword Chlorite H2O-saturated Peridotite solidus Hydrous melting Subduction zone Mantle wedge Cascadia Marianas Mineralogy Mineral Resources Geology
Content Type Text
Resource Type Article
Subject Geochemistry and Petrology Geophysics
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