| Reference Type | Journal (article/letter/editorial) |
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| Title | Fluid inclusion and geochemical evidence for fluid mixing in the genesis of Ba-F (Pb-Zn) lodes of the Spanish Central System |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Tornos, F. | Author |
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| Casquet, C. | Author |
| Locutura, J. | Author |
| Collado, R. | 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_55/55-379-225.pdf+ |
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| DOI | doi:10.1180/minmag.1991.055.379.11Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 1719 | Long-form Identifier | mindat:1:5:1719:4 |
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| GUID | 0 |
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| Full Reference | Tornos, F., Casquet, C., Locutura, J., Collado, R. (1991) Fluid inclusion and geochemical evidence for fluid mixing in the genesis of Ba-F (Pb-Zn) lodes of the Spanish Central System. Mineralogical Magazine, 55 (379) 225-234 doi:10.1180/minmag.1991.055.379.11 |
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| Plain Text | Tornos, F., Casquet, C., Locutura, J., Collado, R. (1991) Fluid inclusion and geochemical evidence for fluid mixing in the genesis of Ba-F (Pb-Zn) lodes of the Spanish Central System. Mineralogical Magazine, 55 (379) 225-234 doi:10.1180/minmag.1991.055.379.11 |
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| In | (1991, June) Mineralogical Magazine Vol. 55 (379) Mineralogical Society |
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| Abstract/Notes | AbstractFluid inclusion data and geochemical evidence lead to a genesis of Ba-F (Pb-Zn) lodes of the Spanish Central System as related to fluid mixing of hot (>300 °C), low saline (<0.6 molal), Na-K deep fluids and cool (<100 °C), oxidized, more saline (>2.8 molal), Na-K-Ca-Mg brines of phraeatic origin. Ore formation took place at relative low depth and temperatures (from 270 to 120 °C) in a regime of increasing fO2, (Ca + Mg)/Na ratio and pH of the fluids towards the surface. Such evolution destabilizes the chloride metal complexes, allowing for the precipitation of Zn and Pb carried by the deep solution.Vertical fluorite-baryte zonation is explained in terms of mineral solubilities. Fluorite deposition in the deeper mineralized zone is related to a slight increase of mCa2+ of the fluid in the lower part of the fluid mixing zone; further increase of mCa2+ and mMg2+ towards the surface promotes fluorite dissolution. Increase of fO2 in the shallow part of the hydrothermal system promotes the oxidation of , resulting in baryte formation.We propose an ore genesis related to fluid mixing in shallow hydrothermal systems associated with an extension of Permo-Triassic age. Such interpretation is in agreement with the present day ideas for the genesis of many of the Ba-F deposits in the Hercynian Belt of Europe. |
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