scholarly journals Deformation, Annealing, Melt‐Rock Interaction, and Seismic Properties of an Old Domain of the Equatorial Atlantic Lithospheric Mantle

Tectonics ◽  
2019 ◽  
Vol 38 (4) ◽  
pp. 1164-1188 ◽  
Author(s):  
Shiran Liu ◽  
Andréa Tommasi ◽  
Alain Vauchez ◽  
Maurizio Mazzucchelli
Keyword(s):  
Lithospheric Mantle ◽  
Equatorial Atlantic ◽  
Rock Interaction ◽  
Seismic Properties

Petrofabric and seismic properties of lithospheric mantle xenoliths from the Calatrava volcanic field (Central Spain)

2016 ◽  
Vol 683 ◽  
pp. 200-215 ◽  
Author(s):  
P. Puelles ◽  
B. Ábalos ◽  
J.I. Gil Ibarguchi ◽  
F. Sarrionandia ◽  
M. Carracedo ◽  
...  
Keyword(s):  
Lithospheric Mantle ◽  
Volcanic Field ◽  
Mantle Xenoliths ◽  
Central Spain ◽  
Seismic Properties

Calcium isotope sources and fractionation during melt-rock interaction in the lithospheric mantle: Evidence from pyroxenites, wehrlites, and eclogites

2019 ◽  
Vol 524 ◽  
pp. 272-282 ◽  
Author(s):  
Jin-Ting Kang ◽  
Dmitri A. Ionov ◽  
Hong-Li Zhu ◽  
Fang Liu ◽  
Zhao-Feng Zhang ◽  
...  
Keyword(s):  
Lithospheric Mantle ◽  
Calcium Isotope ◽  
Rock Interaction

Seismic properties of peridotite xenoliths as a clue to imaging the lithospheric mantle beneath NE Tasmania, Australia

2012 ◽  
Vol 522-523 ◽  
pp. 218-223 ◽  
Author(s):  
K. Michibayashi ◽  
Y. Kusafuka ◽  
T. Satsukawa ◽  
S.J. Nasir
Keyword(s):  
Lithospheric Mantle ◽  
Seismic Properties ◽  
Peridotite Xenoliths

Archean lithospheric differentiation: Insights from Fe and Zn isotopes

Geology ◽  
2020 ◽  
Vol 48 (10) ◽  
pp. 1028-1032
Author(s):  
Luc S. Doucet ◽  
Oscar Laurent ◽  
Dmitri A. Ionov ◽  
Nadine Mattielli ◽  
Vinciane Debaille ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Partial Melting ◽  
Continental Crust ◽  
Lithospheric Mantle ◽  
Isotope Composition ◽  
Isotope Ratios ◽  
Primitive Mantle ◽  
Stable Isotope Ratios ◽  
Rock Interaction ◽  
Zn Isotopes

Abstract The Archean continental lithosphere consists of a dominantly felsic continental crust, made of tonalite-trondhjemite-granodiorite (TTG) and subordinate granitoids, and a cratonic lithospheric mantle, made of highly refractory peridotites. Whether they stemmed from the same process of differentiation from the primitive mantle, or were two distinct components that were physically juxtaposed, remains debated. Metal stable isotope ratios are sensitive to magmatic and metamorphic processes and do not evolve with time. Therefore, stable isotope ratios are complementary to radiogenic isotope ratios, and they allow direct comparisons to be made between different terrestrial components without age corrections. Isotopes of iron and zinc, metals ubiquitous in Earth’s lithosphere, can be tracers of lithospheric formation and evolution because they are affected by partial melting (Fe, Zn), redox state (Fe), and the presence of sulfides (Fe, Zn). Here, using stable Fe and Zn isotopic data from Archean samples of the lithospheric mantle and the continental crust, we show that Fe and Zn isotopes define a linear array, best explained by their coupled fractionation behavior during magmatic processes. Our data show that high degrees of partial melting (>30%) during the formation of the cratonic mantle and mafic protocrust, and reworking of the early crust significantly fractionate Fe and Zn isotopes. Conversely, Fe and Zn isotope ratios in the TTG are similar to those in Archean mafic rocks, suggesting an origin by fractional crystallization of basalt, and implying limited Fe and Zn isotopic fractionation, instead of partial melting of mafic crust. Moreover, the absence of Fe and Zn isotope decoupling due to redox effects, melt (fluid)–rock or sediment-rock interaction, and decarbonation indicates that subduction, at least as we understand it now, is not required to explain the Fe and Zn isotope composition of the Archean lithosphere.

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