U-Pb zircon and monazite geochronology of the hercynian two-mica granite composite pluton of Cabeceiras de Basto (Northern Portugal)

被引：18

作者：

Almeida, A ^{[1
]}

Leterrier, J

Noronha, F

Bertrand, JM

机构：

[1] Univ Porto, Ctr Geol, P-4050 Porto, Portugal

[2] Ctr Rech Petrog & Geochim, F-54501 Vandoeuvre Nancy, France

[3] Univ Savoie, Lab Geodynam Chaines Alpines, F-73376 Le Bourget Du Lac, France

来源：

COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE II FASCICULE A-SCIENCES DE LA TERRE ET DES PLANETES | 1998年 / 326卷 / 11期

关键词：

U-Pb geochronology; zircon; monazite; mica peraluminous granites; Hercynian; North Portugal;

D O I：

10.1016/S1251-8050(98)80243-7

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The zircon and monazite U-Pb minimum age of the Hercynian peraluminous two-mica composite granite pluton of Cabeceiras de Baste (Northern Portugal) is 311+/-1 Ma (2 sigma). This age, well constrained by a concordant monazite of 311 +/- 4 Ma (2 sigma), is in good agreement with the age suggested for the synkynematic, syn-D3, Iberian granites of the Hercynian orogeny (315-305; Pinto et al., 1987). The (Sr-87/Sr-86)(i) and epsilon(Nd) isotopic ratios, calculated for 311 Ma, suggest that the three granite units which constitute the massif may derive from an heterogeneous crustal source dated (upper intercept of the discordia) around 1 200 Ma. (C) Academie des sciences/Elsevier, Paris.

引用

页码：779 / 785

页数：7

共 20 条

[1]

ALMEIDA A, 1995, MEM MUS LABOR MINER, V4, P687

[2]

ALMEIDA A, 1994, THESIS U PORTO

[3]

[Anonymous], THESIS U AMSTERDAM A

[4] CRUSTAL GROWTH IN WEST AFRICA AT 2.1 GA [J].