Mg-enriched erythrite from Bou Azzer, Anti-Atlas Mountains, Morocco: geochemical and spectroscopic characteristics
PBN-AR
Instytucja
Instytut Gospodarki Surowcami Mineralnymi i Energią Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
MINERALOGY AND PETROLOGY (25pkt w roku publikacji)
ISSN
0930-0708
EISSN
1438-1168
Wydawca
SPRINGER WIEN
DOI
URL
Rok publikacji
2018
Numer zeszytu
3
Strony od-do
381–392
Numer tomu
112
Identyfikator DOI
Liczba arkuszy
1,3
Słowa kluczowe
en
Erythrite · Arsenate · Solid solution · Bou Azzer · Morocco
Streszczenia
Język
en
Treść
Abstract Supergene Mg-enriched erythrite, with an average composition ( Co2.25Mg0.58Ni0.14Fe0.04Mn0.02 Zn0.02) ( As1.97P<0.01O8)·8H2O, accompanied by skutterudite, roselite and alloclasite, was identified in a pneumo-hydrothermal quartz-feldspar-carbonate matrix within the ophiolite sequence of Bou Azzer in Morocco. The unit cell parameters of monoclinic Mg-enriched erythrite [space group C2/m, a = 10.252(2) Å, b = 13.427(3) Å, c = 4.757(3) Å, ß = 105.12(1)°] make the mineral comparable with erythrite from other localities. The composition of the sample represents the solid solution between erythrite, hörnesite and annabergite, that is, the nearest to the endmember erythrite. However, Mg-enriched erythrite forming the crystal exhibits variable compositions, especially in Mg and Co contents, with Mg increasing from 0.32 up to 1.39 apfu, and Co decreasing from 2.53 to 1.50 apfu, which manifests in the fine compositional oscillatory zoning. It is the highest content of Mg in erythrite structure reported so far. The most intensive Raman active ν3 and ν1 bands, recorded for the crystal’s zones with maximum Mg contents, occur at 865 and 800 cm− 1 and are shifted towards higher wavenumbers, where normally hörnesite Raman bands appear. The characteristic oscillatory zoning texture results from varying contents of main and trace elements mobilized from the host ores (Co arsenides, mainly skutterudite) and rock-forming minerals (among others, dolomite) by the solutions in the oxidation zone of the ore deposits. The heating of the Mgenriched erythrite up to 1000 °C leads to the crystallization of the water-free (Co,Mg)3(AsO4)2 phase.
Cechy publikacji
discipline:Chemia
discipline:Geologia
discipline:Chemistry
discipline:Geology
Original article
Original article presents the results of original research or experiment.
Oryginalny artykuł naukowy
Oryginalny artykuł naukowy przedstawia rezultaty oryginalnych badań naukowych lub eksperymentu.
Inne
System-identifier
PBN-R:837578
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