Szczegóły publikacji
Opis bibliograficzny
Chemistry of primary and altered Cr-spinels in chromitites and peridotites from the ophiolitic massif in SE Kosovo / Magdalena OŻÓG, Jadwiga PIECZONKA // W: Life with Ore Deposits on Earth [Dokument elektroniczny] : 15th Biennial SGA Meeting, Glasgow, Scotland, August 27-30 2019 : proceedings. vol. 2, Magmatic sulfide and oxide systems ; Gold - from orogenesis to alluvial ; Supergenes, gems and non-metallic ores / University of Glasgow Publicity Services. — Wersja do Windows. — Dane tekstowe. — [Glasgow] : Society for Geology Applied to Mineral Deposits, cop. 2019. — e-ISBN: 978-0-85261-963-6. — S. 573–576. — Wymagania systemowe: Adobe Reader. — Tryb dostępu: https://www.dropbox.com/s/lobfsqlpt7k4nlc/eVolume%202.pdf?dl=0 [2019-09-10]. — Bibliogr. s. 576, Abstr.
Autorzy (2)
Dane bibliometryczne
| ID BaDAP | 124021 |
|---|---|
| Data dodania do BaDAP | 2019-09-20 |
| Rok publikacji | 2019 |
| Typ publikacji | materiały konferencyjne (aut.) |
| Otwarty dostęp |  |
| Konferencja | 15th Biennial SGA Meeting Life with Ore Deposits on Earth |
Abstract
The diversity of Cr-spinels, which make up chromitites and represent accessory mineral in peridotites occurring within the ophiolitic massif in SE Kosovo, has been studied using EPMA. Grains displaying composition of magnesiochromite and chromite, as well as spinel (only in harzburgite), have been distinguished. The results indicate a supra-subduction zone setting for the studied ophiolite, corroborating with the boninitic affinity of the parental magma. The investigated Cr-spinels show resemblance with spinels from forearc peridotites. The chromite in chromitites and Cr-spinels in dunite have similar Cr# and TiO2 content (similar to 0.80; similar to 0.20 wt.%), whereas the Cr-spinels in harzburgite have significantly lower Cr# and TiO2 content (0.61; 0.11 wt.%). It shows that harzburgite has been formed by high degrees of partial melting of a fertile MORS mantle source and dunite has been influenced by melt-peridotite interaction process. The primary accessory Cr-spinel is richer in Fe, Mg and Al than the primary chromite in chromitites, due to more effective subsolidus re equilibration with silicates during crystallization in peridotites. As the products of Cr-spinel alteration, ferritchromite and magnetite have been formed along cataclastic fractures and rims. Generally, the altered spinels have higher abundances of Mn, Si, Zn, Ni and Co compared to the unaltered spinels. The significant increase of MnO content (up to 1.26 wt.%), especially in dunite, indicates Mn mobilization by hydrothermal fluids and its addition to ferritchromite.
