The role of fluid evolution in Au enrichment in Vila Pouca de Aguiar area, Portugal

• Type: Article in International Conference Proceedings Book
• Date: 1999

Authors

Ribeiro, MA (Author) FCUP; Doria, A (Author) Other; Noronha, F (Author) FCUP

Conference proceedings International

Title: MINERAL DEPOSITS: PROCESSES TO PROCESSING, VOLS 1 AND 2

Pages: 1029-1032

5th Biennial Meeting of the Society-for-Geology-Applied-to-Mineral-Deposits / 10th Quadrennial Symposium of the International-Association-on-the-Genesis-of-Ore-Deposits

LONDON, ENGLAND, AUG 22-25, 1999

Indexing

ISI Web of Knowledge - 2 Citations

Scientific classification

FOS: Engineering and technology > Environmental engineering

Other information

Authenticus ID: P-001-608

Abstract (EN): Vila Pouca de Aguiar an important gold-bearing region corresponds to a crustal segment with an average in Au, Cr, V, Ni and Sc content higher than the crustal average. Textural and fluid inclusion studies of the ore-bearing structures, in addition to tectono-metamorphic and geochemical characterization of the metasedimentary sequence suggests that the composition of the ore fluids were controlled by the nature and metamorphic evolution of the surrounding rocks. The estimated P-T conditions of fluid trapping are T = 500 degrees to 550 degrees C and P = 350 to 400 Mpa. This fluid evolved from peak metamorphic conditions towards lower pressures (250 to 80 Mpa), accompanied by dilution of the fluids associated with a moderate decreasing of the the temperature. Gold was precipitated under lower P-T conditions.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4