Szczegóły publikacji
Opis bibliograficzny
Agates from Kerrouchen (The Atlas Mountains, Morocco): textural types and their gemmological characteristics / Lucyna NATKANIEC-NOWAK, Magdalena DUMAŃSKA-SŁOWIK, Jaroslav PRŠEK, Marek LANKOSZ, Paweł WRÓBEL, Adam GAWEŁ, Joanna KOWALCZYK, Jacek Kocemba // Minerals [Dokument elektroniczny]. — Czasopismo elektroniczne ; ISSN 2075-163X. — 2016 — vol. 6 iss. 3 art. no. 77, s. 1–13. — Wymagania systemowe: Adobe Reader. — Bibliogr. s. 12–13, Abstr. — Publikacja dostępna online od: 2016-07-26
Autorzy (8)
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 99990 |
|---|---|
| Data dodania do BaDAP | 2016-09-19 |
| Tekst źródłowy | URL |
| DOI | 10.3390/min6030077 |
| Rok publikacji | 2016 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Minerals |
Abstract
Agate nodules from Kerrouchen (Khénifra Province, Meknés-Tafilalet Region) in Morocco occur in Triassic basalts and reach up to 30 cm in diameter. Monocentric, banded agates—mainly in pastel pink, grey, white and yellow—with infiltration canals (osculum) are observed. Raman microspectroscopy revealed that the agates mainly consist of low quartz and subordinately moganite with distinctive 460 and 501 cm−1 marker bands, respectively. Linear mapping indicated that moganite mainly concentrates in grey zones of the monocentric agate nodules. The other types, polycentric and pseudostalactitic agates, are usually brown and red and contain minerals such as hematite and goethite. They form both regular and irregular mosaics rich in ornamentation. Occasionally, aggregates of copper sulphides or titanium oxides (rutile) can also be observed. These minerals are sometimes accompanied by carbonaceous material marked by 1320 and 1585 cm−1 Raman bands. It seems that formation of agates from Kerrouchen was induced by Si-rich and Fe-moderate fluids. Copper sulphides, rutile, and carbonates (possibly calcite) were most likely incorporated during post-magmatic processes. The origin of solid bitumen can be the result of hydrothermal or hypergenic processes.
