scholarly journals Deep sourced fluids for peridotite carbonation in the shallow mantle wedge of a fossil subduction zone: Sr and C isotope profiles of OmanDP Hole BT1B

2021 ◽  
Author(s):  
Juan Carlos Obeso ◽  
Peter B. Kelemen ◽  
James M. Leong ◽  
Manuel D. Menzel ◽  
Craig E. Manning ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Mantle Wedge

scholarly journals Seismic evidence for flow in the hydrated mantle wedge of the Ryukyu subduction zone

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Takayoshi Nagaya ◽  
Andrew M. Walker ◽  
James Wookey ◽  
Simon R. Wallis ◽  
Kazuhiko Ishii ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Mantle Wedge

scholarly journals Ophiolitic Pyroxenites Record Boninite Percolation in Subduction Zone Mantle

Minerals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 565 ◽  
Author(s):  
Véronique Le Roux ◽  
Yan Liang
Keyword(s):  
Subduction Zone ◽  
Subduction Zones ◽  
Mantle Wedge ◽  
Major Element ◽  
Early Stage ◽  
Diffusion Modeling ◽  
Melt Infiltration ◽  
Melt Percolation ◽  
Back Arc ◽  
Parental Melts

The peridotite section of supra-subduction zone ophiolites is often crosscut by pyroxenite veins, reflecting the variety of melts that percolate through the mantle wedge, react, and eventually crystallize in the shallow lithospheric mantle. Understanding the nature of parental melts and the timing of formation of these pyroxenites provides unique constraints on melt infiltration processes that may occur in active subduction zones. This study deciphers the processes of orthopyroxenite and clinopyroxenite formation in the Josephine ophiolite (USA), using new trace and major element analyses of pyroxenite minerals, closure temperatures, elemental profiles, diffusion modeling, and equilibrium melt calculations. We show that multiple melt percolation events are required to explain the variable chemistry of peridotite-hosted pyroxenite veins, consistent with previous observations in the xenolith record. We argue that the Josephine ophiolite evolved in conditions intermediate between back-arc and sub-arc. Clinopyroxenites formed at an early stage of ophiolite formation from percolation of high-Ca boninites. Several million years later, and shortly before exhumation, orthopyroxenites formed through remelting of the Josephine harzburgites through percolation of ultra-depleted low-Ca boninites. Thus, we support the hypothesis that multiple types of boninites can be created at different stages of arc formation and that ophiolitic pyroxenites uniquely record the timing of boninite percolation in subduction zone mantle.

The southwestern edge of the Ryukyu subduction zone: A high Q mantle wedge

2012 ◽  
Vol 335-336 ◽  
pp. 145-153 ◽  
Author(s):  
Yen-Ting Ko ◽  
Ban-Yuan Kuo ◽  
Kuo-Lung Wang ◽  
Shu-Chuan Lin ◽  
Shu-Huei Hung
Keyword(s):  
Subduction Zone ◽  
Mantle Wedge ◽  
High Q

The importance of mantle wedge heterogeneity to subduction zone magmatism and the origin of EM1

2017 ◽  
Vol 472 ◽  
pp. 216-228 ◽  
Author(s):  
Stephen J. Turner ◽  
Charles H. Langmuir ◽  
Michael A. Dungan ◽  
Stephane Escrig
Keyword(s):  
Subduction Zone ◽  
Mantle Wedge ◽  
Subduction Zone Magmatism

scholarly journals Geochemistry, Sr–Nd–Pb isotopes and geochronology of amphibole- and mica-bearing lamprophyres in northwestern Iran: Implications for mantle wedge heterogeneity in a palaeo-subduction zone

Lithos ◽  
2015 ◽  
Vol 216-217 ◽  
pp. 352-369 ◽  
Author(s):  
Mehraj Aghazadeh ◽  
Dejan Prelević ◽  
Zahra Badrzadeh ◽  
Eleonora Braschi ◽  
Paul van den Bogaard ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Mantle Wedge ◽  
Pb Isotopes ◽  
Northwestern Iran
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