A revised Ordovician age for the Sisargas orthogneiss, Galicia (Spain)Zircon U-Pb ion-microprobe and LA-ICPMS dating

1. Talavera, C.
2. Bea Barredo, Fernando
3. Montero, P.
4. Whitehouse, M.

Exportar

Exportar

×

MLA

modern-language-association

APA

apa

Chicago

chicago-fullnote-bibliography

Harvard

harvard-cite-them-right

Vancouver

vancouver-author-date

---

RIS BibTex

Exportar

×

Non se pode exportar o documento porque pertence a outro portal.

Texto completo

lock_openDialnet dialnet lock_openTexto completo externo

DIALNET GOOGLE SCHOLAR lock_openDialnet editor

Outras publicacións en: Geologica acta: an international earth science journal

Resumo

The Sisargas orthogneiss is located in the Schistose Domain of the Galicia Trás-Os-Montes Zone. It has previously been dated by Allegret and Iglesias (1987) who reported an U-Pb upper intercept at 570 ± 14 Ma, considered to be the crystallization age. For this reason, the Sisargas orthogneiss has traditionally been considered one of the oldest magmatic rocks of the Central Iberian Zone. However, new SIMS and LA-ICPMS data reveal that it crystallized at 479 ± 7 Ma and contains zircons with abundant pre-magmatic cores with ages clustering at 585 ± 15 Ma. This suggests that the Sisargas orthogneiss derives from the melting of a Pan-African protolith.

Fonte de datos: Dialnet