@article{fdi:010065271, title = {{A}n {E}arth-{M}oon silicon isotope model to track silicic magma origins}, author = {{P}oitrasson, {F}ranck and {Z}ambardi, {T}.}, editor = {}, language = {{ENG}}, abstract = {{A} comparison between terrestrial and lunar igneous rocks reveals that {S}i isotope compositions become slightly, though significantly enriched in heavy isotopes from basalts to granites and anorthosites as a function of the rock {S}i{O}2 concentration and/or tectosilicate content. {T}his is interpreted as the result of a global igneous differentiation process that leads to an increased amount of tectosilicates in the rocks. {T}his relationship of increasing degree of melt polymerization with increasingly heavy silicon isotope composition is particularly apparent in lunar rocks. {T}he terrestrial trend, however, is more scattered. {G}iven the sensitivity of {S}i isotopes to water-rock interactions, it is likely that the more erratic terrestrial trend reveals the involvement of water that does not occur on the {M}oon. {H}ence, {S}i isotopes appear to reflect the occurrence of low temperature water-rock interaction products, like clay minerals, in the source of peraluminous leucogranites. {C}onversely, the heavy silicon isotope composition of some andesites possibly trace the input of fluids involved in subduction zones and/or interaction of the oceanic crust with isotopically heavy seawater before subduction.}, keywords = {}, booktitle = {}, journal = {{G}eochimica et {C}osmochimica {A}cta}, volume = {167}, numero = {}, pages = {301--312}, ISSN = {0016-7037}, year = {2015}, DOI = {10.1016/j.gca.2015.07.005}, URL = {https://www.documentation.ird.fr/hor/fdi:010065271}, }