Fluid inclusion study of the Bournac polymetallic (Sb-As-Pb-Zn-Fe-Cu . . .) vein deposit (Montagne Noire, France)

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Authors:Munoz, M.; Shepherd, T. J.
Author Affiliations:Primary:
Univ. Paul Sabatier, Lab. Minéral., Assoc. C.N.R.S., U.A. 67, F-31400 Toulouse, France
Volume Title:Mineralium Deposita
Source:Mineralium Deposita, 22(1), p.11-17. Publisher: Springer-Verlag, Berlin, Federal Republic of Germany. ISSN: 0026-4598
Publication Date:1987
Note:In English. 38 refs.; illus. incl. 2 tables, geol. sketch map
Summary:The Hercynian polymetallic Sb-rich deposit of Bournac can be described mineralogically by four stages of ore deposition and one of partial ore remobilization. Stages I and II (Fe-As and Zn) have moderate-salinity H2O-CO2-(NaCl) inclusions correlated closely with early carbonate deposition. Stage III fluids responsible for the deposition of Pb-Sb ores have low-salinity H2O-(NaCl) inclusions. During the final stage of mineralization (IV), corresponding with the main phase of stibnite deposition, abundant aqueous inclusions confirm the continued involvement of low-salinity fluids and the intense development of potassic clays and secondary silica in the wall-rocks. Homogenization temperatures suggest that the whole cycle of mineralization took place during a gradual decrease in fluid T of 380-140°C. Stibnite deposition is restricted to the interval of 230-140°C, thus confirming an essentially epithermal environment. Stage V (partial remobilization) is distinguished by the presence of high-salinity CaCl2-rich inclusions which are tentatively related to Triassic baryte mineralization in the region and therefore post-date the Bournac antimony ores. Homogenization T for this stage were 140-60°C. [L.G.L.]
Subjects:Economic geology; Fluid inclusions; Geologic thermometry; Inclusions; Metal ores; Microthermometry; Mineralization; P-T conditions; Polymetallic ores; Thermal analysis; Veins; Central Massif; Europe; France; Montagne Noire; Western Europe
Abstract Numbers:88M/0367
Record ID:1988004790
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe
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