Geochemistry From cinder cones to subduction zones| Volatile recycling and magma formation beneath the Southern Cascade Arc UNIVERSITY OF OREGON Paul J. Wallace WalowskiKristina JanineVolatiles (H2O, CO2, S, Cl) play a key role in magmatic processes at subduction zones. In this study, the ...
The C–O isotopic compositions of calcite indicate that the ore-forming fluid was originally derived from granitic magma, and then mixed with reduced fluid exsolved from local carbonate strata. Depressurization and resultant fluid boiling were key to precipitation of W in the retrograde skarn stage....
Much debate exists concerning mechanisms of crustal material transfer from subducting slab to overlying mantle. Formation of mélange rocks by physical mixing of slab components within subduction plate interface is predicted to transfer their composition
Considering regional tectonic sedimentary evolution and previous research results, the authors hold that the volcanic rocks of the Qushenla Formation were probably related to the slab break-offduring southward subduction of the Bangong Co-Nujiang oceanic crust in the Early Cretaceous, and were ...
striking intraplate strike-slip faults (Fig. 10a). Subsequently, the plate subduction retreated to form an extensional background in the plate, and the plate began to breakup along the early magma zone, forming a Nanhuanian rift system dominated by NE-striking, NEE-striking and nearly WE-...
sulfidation, de-hydration and de-carbonation reactions during earlier subduction of the Paleo-Pacific plate, and then the over-pressured fluids can be transported from the mantle transition zone to the mantle lithosphere, and could lead to hydration, sulfidation, and fertilization of the mantle ...
Rabayrol, F., Hart, C.J.R. Petrogenetic and tectonic controls on magma fertility and the formation of post-subduction porphyry and epithermal mineralization along the late Cenozoic Anatolian Metallogenic Trend, Turkey.Miner Deposita56, 279–306 (2021). https://doi.org/10.1007/s00126-020-00967-...
Platinum-group element (PGE) deposits in the Bushveld Complex and other layered intrusions form when large, incompletely solidified magma chambers undergo central subsidence in response to crustal loading, resulting in slumping of semi-consolidated cumulate slurries to the centres of the intrusions and ...
A slight difference in the values of eEu (EuN/Eu* = Eu*2/(Sm ? Gd), * 0.1-0.9) suggests the diversity of the magma source during the crystallization of zircons (Fig. 9a). Combined with the zircon REE data (Fig. 8), it indicates that zircons in the Glarus A TF and the ...
Petrogenetic and tectonic controls on magma fertility and the formation of post-subduction porphyry and epithermal mineralization along the late Cenozoic Anatolian Metallogenic Trend, Turkeydoi:10.1007/s00126-020-00967-9Fabien RabayrolCraig J. R. Hart...