The role of brines on genesis of Pb-Zn-Ba mineralizations in basement and in cover: The example of Tazekka Pb-Zn district, eastern Morocco

• Type: Article in International Scientific Journal
• Date: 2011

Authors

Auajjar, J (Author) Other; Noronha, F (Author) FCUP

Journal

Title: Cadernos do Laboratorio Xeoloxico de Laxe

Pages: 25-40

ISSN: 0213-4497

Publisher: Seminario de Estudos Galegos

Indexing

ISI Web of Knowledge

Scopus - 0 Citations

Other information

Authenticus ID: P-005-4B6

Abstract (EN): The Tazekka Pb-Zn district, eastern Morocco, includes both mineralized veins and stockworks in the Palaeozoic basement and stratabound deposits in the Liassic carbonate cover rocks. The purpose of this study is to examine the relationship between mineralization seen in the basement and cover by combining field observations, mineralogy, fluid inclusion data and previous stable isotope data and use this information to present a model for the formation of the Pb-Zn ores. The results suggest that the general fluid evolution is similar in most of the studied deposits and is independent of the host rock. The high salinity and low temperature fluids are present in the cover where they are anterior to the mineralization deposition. The wide range of salinities suggests that fluid mixing has occurred, possibly between evaporated seawater brine and a lower salinity fluid. Sphalerite deposition can be interpreted as related to fluids of intermediate salinity probably associated with the mixing process. The resemblance between the obtained results and others concerning Pb-Zn ore deposits across Europe suggests an important water-rock interaction related to a downward migration of the fluids.

Language: English

Type (Professor's evaluation): Scientific