An Early-Cambrian U-Pb apatite cooling age for the high-temperature regional metamorphism in the Piancó area, Borborema Province (NE Brazil): Initial conclusions

Bruno Dhuime, Delphine Bosch, Olivier Bruguier, Renaud Caby*, Carlos Archanjo

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

4 Citations (Scopus)

Abstract

The Borborema Province (BP) of northeastern Brazil is a complex crustal assemblage, which has undergone a polycyclic evolution during the Proterozoic. In the Piancó-Alto Bŕgida belt, a metamorphosed leucosome vein inserted in amphibolites has a trace element pattern suggesting a T-MORB protolith. Apatites yield a REE pattern indicating growth in equilibrium with garnet, thus pointing to its metamorphic origin. U-Pb analyses yield an age of 540 ±5 Ma interpreted as a cooling age following amphibolite facies regional metamorphism associated with granitic emplacement at ca. 580 Ma. The resulting slow cooling rates (ranging from ca. 2.5 to 5 °C Ma-1) are consistent with underplating of mafic magmas, or crustal thickening caused by nappe stacking, as possible processes governing the metamorphic evolution of the BP.

Translated title of the contributionAn Early-Cambrian U-Pb apatite cooling age for the high-temperature regional metamorphism in the Piancó area, Borborema Province (NE Brazil): Initial conclusions
Original languageFrench
Pages (from-to)1081-1089
Number of pages9
JournalComptes Rendus Géoscience
Volume335
Issue number15
DOIs
Publication statusPublished - 1 Jan 2003

Keywords

  • Apatite
  • Borborema Province
  • Cooling age
  • U-Pb dating

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