Artículo de revista
The enigma of crustal zircons in upper-mantle rocks: Clues from the Tumut ophiolite, southeast Australia
Fecha
2015Registro en:
Geology, February 2015; v. 43; no. 2; p. 119–122
1943-2682
DOI: 10.1130/G36231.1
Autor
Belousova, Elena
González Jiménez, José
Graham, Ian
Griffin, William
O’Reilly, Suzanne
Pearson, Norman
Martin, Laure
Craven, Stephen
Talavera, Cristina
Institución
Resumen
We suggest a new explanation for the presence of crustally
derived zircons in the upper-mantle rocks of ophiolitic complexes,
as an alternative to subduction-related models. Integrated isotopic
(U-Pb, Hf, and O isotopes) and trace-element data for zircons from
the Tumut ophiolitic complex (southeast Australia) indicate that
these grains are related to granitic magmatism and were introduced
into the mantle rocks after their emplacement into the crust. These
observations emphasize that a clear understanding of the origin of
individual zircon populations and their relationship to the host rock
is essential to interpretations of the tectonic history of upper-mantle
rocks and the dynamics of crust-mantle interactions.