Si isotope fractionation between Si-poor metal and silicate melt at pressure–temperature conditions relevant to metal segregation in small planetary bodies

2013 ◽  
Vol 368 ◽  
pp. 61-68 ◽  
Author(s):  
J. Kempl ◽  
P.Z. Vroon ◽  
E. Zinngrebe ◽  
W. van Westrenen
Keyword(s):  
Isotope Fractionation ◽  
Silicate Melt ◽  
Temperature Conditions ◽  
Planetary Bodies ◽  
Si Isotope

scholarly journals Serpentine alteration as source of high dissolved silicon and elevated δ30Si values to the marine Si cycle

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Sonja Geilert ◽  
Patricia Grasse ◽  
Klaus Wallmann ◽  
Volker Liebetrau ◽  
Catriona D. Menzies
Keyword(s):  
Closed System ◽  
Isotope Fractionation ◽  
Mantle Wedge ◽  
Important Process ◽  
Sr Isotope ◽  
Element Cycling ◽  
High Fluid ◽  
Dissolved Silicon ◽  
Si Isotope ◽  
Forearc Region

Abstract Serpentine alteration is recognized as an important process for element cycling, however, related silicon fluxes are unknown. Pore fluids from serpentinite seamounts sampled in the Mariana forearc region during IODP Expedition 366 were investigated for their Si, B, and Sr isotope signatures (δ30Si, δ11B, and 87Sr/86Sr, respectively) to study serpentinization in the mantle wedge and shallow serpentine alteration to authigenic clays by seawater. While serpentinization in the mantle wedge caused no significant Si isotope fractionation, implying closed system conditions, serpentine alteration by seawater led to the formation of authigenic phyllosilicates, causing the highest natural fluid δ30Si values measured to date (up to +5.2 ± 0.2‰). Here we show that seafloor alteration of serpentinites is a source of Si to the ocean with extremely high fluid δ30Si values, which can explain anomalies in the marine Si budget like in the Cascadia Basin and which has to be considered in future investigations of the global marine Si cycle.

Theoretical calculation of equilibrium Mg isotope fractionation between silicate melt and its vapor

2018 ◽  
Vol 37 (5) ◽  
pp. 655-662
Author(s):  
Haiyang Luo ◽  
Huiming Bao ◽  
Yuhong Yang ◽  
Yun Liu
Keyword(s):  
Theoretical Calculation ◽  
Isotope Fractionation ◽  
Silicate Melt

scholarly journals Evidence for a Phase Transition in Silicate Melt at Extreme Pressure and Temperature Conditions

2012 ◽  
Vol 108 (6) ◽  
Author(s):  
D. K. Spaulding ◽  
R. S. McWilliams ◽  
R. Jeanloz ◽  
J. H. Eggert ◽  
P. M. Celliers ◽  
...  
Keyword(s):  
Phase Transition ◽  
Silicate Melt ◽  
Extreme Pressure ◽  
Temperature Conditions

scholarly journals Erratum: Evidence for a Phase Transition in Silicate Melt at Extreme Pressure and Temperature Conditions [Phys. Rev. Lett. 108 , 065701 (2012)]

2017 ◽  
Vol 119 (13) ◽  
Author(s):  
D. K. Spaulding ◽  
R. S. McWilliams ◽  
R. Jeanloz ◽  
J. H. Eggert ◽  
P. M. Celliers ◽  
...  
Keyword(s):  
Phase Transition ◽  
Silicate Melt ◽  
Extreme Pressure ◽  
Temperature Conditions
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