| Reference Type | Journal (article/letter/editorial) |
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| Title | C-O-H-N fluid inclusions associated with gold-stibnite mineralization in low-grade metamorphic rocks, Mari Rosa mine, Caceres, Spain |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Ortega, L. | Author |
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| Vindel, E. | Author |
| Beny, C. | Author |
| Year | 1991 (June) | Volume | 55 |
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| Issue | 379 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_55/55-379-235.pdf+ |
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| DOI | doi:10.1180/minmag.1991.055.379.12Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 1720 | Long-form Identifier | mindat:1:5:1720:0 |
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| GUID | 0 |
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| Full Reference | Ortega, L., Vindel, E., Beny, C. (1991) C-O-H-N fluid inclusions associated with gold-stibnite mineralization in low-grade metamorphic rocks, Mari Rosa mine, Caceres, Spain. Mineralogical Magazine, 55 (379) 235-247 doi:10.1180/minmag.1991.055.379.12 |
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| Plain Text | Ortega, L., Vindel, E., Beny, C. (1991) C-O-H-N fluid inclusions associated with gold-stibnite mineralization in low-grade metamorphic rocks, Mari Rosa mine, Caceres, Spain. Mineralogical Magazine, 55 (379) 235-247 doi:10.1180/minmag.1991.055.379.12 |
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| In | (1991, June) Mineralogical Magazine Vol. 55 (379) Mineralogical Society |
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| Abstract/Notes | AbstractThe Mari Rosa mine lies within a low-grade Precambrian alternating series of black shales and metagreywackes in the Spanish Hercynian massif. There are two generations of mineralized veins: V2, gold-(stibnite)-bearing quartz veins, parallel to the main cleavage, and V3, stibnite-bearing quartz veins which postdate the main deformation event.Four main types of inclusions have been identified. Type I, II and IV are aqueous-carbonaceous inclusions, with variable degrees of filling, while type III are non-aqueous and typically single-phase at room temperature. Except for type I (absent in V3), similar inclusions have been observed in both V2 and V3 veins. Gas compositions are always characterised by CH4-N2-CO2 assemblages, ranging from CO2-rich mixtures in the earliest inclusions (type I), to N2-rich mixtures in the latest inclusions (type IV).Gold precipitation in V2 veins can be related to type I inclusions at T > 380°C (TH = 300–380°C). A subsequent drop in XCO2 and cooling are recorded in type II and III inclusions, interpreted to be the result of unmixing of a previously homogeneous fluid derived from type I. This boiling would provoke the precipitation of stibnite at 300°C and 1 kbar. The type IV inclusions, which are the richest in H2O, represent a late fluid circulation at lower temperatures (TH = 190–280°C). |
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