Investigation of Platinum-Group Minerals (PGM) from Othrys Chromitites (Greece) Using Superpanning Concentrates
| Autor: | Sofia Karipi, Tassos A. Grammatikopoulos, Basilios Tsikouras, Elena Ifandi, Konstantin Hatzipanagiotou |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Othrys ophiolite
lcsh:Mineralogy lcsh:QE351-399.2 010504 meteorology & atmospheric sciences Greece Geochemistry Geology PGM chromitite Platinum group 010502 geochemistry & geophysics Geotechnical Engineering and Engineering Geology Ophiolite IPGE PPGE 01 natural sciences Mantle (geology) Broad spectrum Chromitite Fugacity Fluid phase 0105 earth and related environmental sciences |
| Zdroj: | Minerals, Vol 6, Iss 3, p 94 (2016) Minerals; Volume 6; Issue 3; Pages: 94 |
| Popis: | Platinum-group minerals were concentrated using superpanning from two composite chromitite samples, which were collected from two old mines within the Othrys ophiolite. This method allows for the recovery of a broad spectrum of these rare and fine-grained minerals, and helps to better identify them and interpret their origin. Major differences between the east and west Othrys ophiolites were determined, probably as a result of their different origin and evolution. Primary Os-, Ir-, and Ru-bearing platinum-group minerals (IPGM)-alloys and the Rh-, Pt- and Pd-bearing platinum-group minerals (PPGM) occur only in the east Othrys chromitite, indicating an evolution from initially low fS2 conditions at shallower mantle levels with the subsequent implication of a S-saturated ascending fluid. In contrast, the absence of primary IPGM-alloys in west Othrys chromitite indicates that S saturation had been attained. The presence of erlichmanite suggests that sulphur fugacity eventually increased significantly in both suites. Substantial fluctuations of a fluid phase, likely related to serpentinising fluids, modified the platinum-group minerals (PGM) assemblage of west Othrys, and resulted in a large diversity of secondary PGM minerals. The limited number of secondary species developed in the east Othrys indicate that secondary processes were also different in the two suites. |
| Databáze: | OpenAIRE |
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