The Moroccan Massive Sulphide Deposits: Evidence for a Polyphase Mineralization
| Autor: | Lhou Maacha, Abdelmalek Ouadjou, Abderrahim Essaifi, Kathryn Goodenough, Abdelhak Outigua, Fernando Tornos |
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| Přispěvatelé: | Consejo Superior de Investigaciones Científicas (España), Secretaría de Estado de Universidades e Investigación (España) |
| Rok vydání: | 2019 |
| Předmět: |
Mineralization (geology)
lcsh:Mineralogy lcsh:QE351-399.2 010504 meteorology & atmospheric sciences Metamorphic rock Transtension Geochemistry Geology engineering.material 010502 geochemistry & geophysics Geotechnical Engineering and Engineering Geology 01 natural sciences Transpression Diagenesis Shear zones Moroccan Meseta Isotopic signature Hercynian engineering Polymetallic massive sulphide deposits Sedimentary rock Pyrite 0105 earth and related environmental sciences |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname Minerals Volume 9 Issue 3 Minerals, Vol 9, Iss 3, p 156 (2019) |
| Popis: | This work provides an overview of the geological, geochemical, and metallogenic data available up to date on the Moroccan massive sulphide deposits, including some new results, and then discusses the evidences for the epigenetic and syngenetic hypotheses. All of the ore deposits are located within a crustal block located at the intersection between two major shear zones and are characterized by a sustained and long-lived magmatic activity. The ore deposits are located within second-order shear zones, which played an important role in controlling the geometry of the mineralization. The mineralization lacks the unequivocal textural and structural features that are indicative of a sedimentary or diagenetic origin, and a syntectonic to late-tectonic pyrite-rich assemblage is superimposed on an earlier, pretectonic to syntectonic pyrrhotite-rich mineralization. Each deposit has a distinctive pyrrhotite sulfur isotopic signature, while the sulfur isotopic signature of pyrite is similar in all deposits. Lead isotopes suggest a shift from a magmatic source during the pyrrhotite-rich mineralization to a source that is inherited from the host shales during the pyrite-rich mineralization. The O/H isotopic signatures record a predominance of fluids of metamorphic derivation. These results are consistent with a model in which an earlier pyrrhotite-rich mineralization, which formed during transtension, was deformed and then remobilized to pyrite-rich mineralization during transpression. This work received a financial support from the project URAC 43. The collaboration of F. Tornos is a contribution to the Spanish SEIDI CGL-2011-23207 project. We acknowledge support by the CSIC Open Access Publication Initiative through its Unit of Information Resources for Research (URICI) |
| Databáze: | OpenAIRE |
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