Mineralogical and Geochemical Constraints On the Origin of Mafic–Ultramafic-Hosted Sulphides: The Pindos Ophiolite Complex
| Autor: | George Economou, Maria Economou-Eliopoulos, Vassilis Skounakis, Demetrios G. Eliopoulos |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
lcsh:QE351-399.2
010504 meteorology & atmospheric sciences Geochemistry engineering.material 010502 geochemistry & geophysics Ophiolite 01 natural sciences Ultramafic rock Bornite ophiolites selenium Pyrrhotite 0105 earth and related environmental sciences lcsh:Mineralogy Siegenite Gabbro Chemistry ultramafic sulphides Geology Pindos Covellite gold Geotechnical Engineering and Engineering Geology Sphalerite visual_art visual_art.visual_art_medium engineering |
| Zdroj: | Minerals Volume 10 Issue 5 Minerals, Vol 10, Iss 454, p 454 (2020) |
| ISSN: | 2075-163X |
| DOI: | 10.3390/min10050454 |
| Popis: | Sulphide ores hosted in deeper parts of ophiolite complexes may be related to either primary magmatic processes or links to hydrothermal alteration and metal remobilization into hydrothermal systems. The Pindos ophiolite complex was selected for the present study because it hosts both Cyprus-type sulphides (Kondro Hill) and Fe&ndash Cu&ndash Co&ndash Zn sulphides associated with magnetite (Perivoli-Tsoumes) within gabbro, close to its tectonic contact with serpentinized harzburgite, and thus offers the opportunity to delineate constraints controlling their origin. Massive Cyprus-type sulphides characterized by relatively high Zn, Se, Au, Mo, Hg, and Sb content are composed of pyrite, chalcopyrite, bornite, and in lesser amounts covellite, siegenite, sphalerite, selenide-clausthalite, telluride-melonite, and occasionally tennantite&ndash tetrahedrite. Massive Fe&ndash Zn-type sulphides associated with magnetite occur in a matrix of calcite and an unknown (Fe,Mg) silicate, resembling Mg&ndash hisingerite within a deformed/metamorphosed ophiolite zone. The texture and mineralogical characteristics of this sulphide-magnetite ore suggest formation during a multistage evolution of the ophiolite complex. Sulphides (pyrrhotite, chalcopyrite, bornite, and sphalerite) associated with magnetite, at deeper parts of the Pindos (Tsoumes), exhibit relatively high Cu/(Cu + Ni) and Pt/(Pt + Pd), and low Ni/Co ratios, suggesting either no magmatic origin or a complete transformation of a preexisting magmatic assemblages. Differences recorded in the geochemical characteristics, such as higher Zn, Se, Mo, Au, Ag, Hg, and Sb and lower Ni contents in the Pindos compared to the Othrys sulphides, may reflect inheritance of a primary magmatic signature. |
| Databáze: | OpenAIRE |
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