40Ar/39Ar geochronology of gold mineralization in Brasiliano strike-slip shear zones in the Barborema province, NE Brazil

Araujo, Mário Neto C., Vasconcelos, Paulo M., da Silva, Fernando C., Jardim de Sa, Emanuel F. and Sá, Jaziel M. (2005) 40Ar/39Ar geochronology of gold mineralization in Brasiliano strike-slip shear zones in the Barborema province, NE Brazil. Journal of South American Earth Sciences, 19 4: 446-460. doi:10.1016/j.jsames.2005.06.009


Author Araujo, Mário Neto C.
Vasconcelos, Paulo M.
da Silva, Fernando C.
Jardim de Sa, Emanuel F.
Sá, Jaziel M.
Title 40Ar/39Ar geochronology of gold mineralization in Brasiliano strike-slip shear zones in the Barborema province, NE Brazil
Journal name Journal of South American Earth Sciences   Check publisher's open access policy
ISSN 0895-9811
1873-0647
Publication date 2005-09-01
Sub-type Article (original research)
DOI 10.1016/j.jsames.2005.06.009
Volume 19
Issue 4
Start page 446
End page 460
Total pages 15
Editor J.N. Kellogg
Place of publication Oxford, United Kingdom
Publisher Pergamon
Collection year 2005
Language eng
Subject 260109 Geochronology
780104 Earth sciences
040203 Isotope Geochemistry
Abstract 40Ar/39Ar geochronology of muscovite and biotite grains genetically related to gold and Be–Ta–Li pegmatites from the Seridó Belt (Borborema province, NE Brazil) yield well-defined, reliable plateau ages. This information, combined with data about paragenetic and field relationships, reveals Cambro-Ordovician mineralization ages (520 and 500–506 Ma) for the orogenic gold deposits in the Seridó Belt. Biotite ages of 525±2 Ma, which represent the mean weighted results of the incremental heating analysis of six biotite single crystals, record the time of pegmatite emplacement and reactivation of Brasiliano/Pan-African strike-slip shear zones. These results, along with previous structural evolution studies, suggest that shear zones formed during the Brasiliano/Pan-African event were reactivated in the Upper Cambrian–Lower Ordovician. Mineralization occurs late in the history of the orogen.
Keyword 40Ar/39Ar dating
Au-mineralization
Pegmatite
Reactivation
Shear zones
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

 
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Created: Wed, 15 Aug 2007, 17:49:15 EST