Ultrahigh-temperature sphalerite from zn-cd-se-rich combustion metamorphic marbles, daba complex, central Jordan: Paragenesis, chemistry, and structure

Ella V. Sokol, Svetlana N. Kokh, Yurii V. Seryotkin, Anna S. Deviatiiarova, Sergey V. Goryainov, Victor V. Sharygin, Hani N. Khoury, Nikolay S. Karmanov, Victoria A. Danilovsky, Dmitry A. Artemyev

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

Аннотация

Minerals of the Zn-Cd-S-Se system that formed by moderately reduced ~800–850 °C combustion metamorphic (CM) alteration of marly sediments were found in marbles from central Jordan. Their precursor sediments contain Se-and Ni-enriched authigenic pyrite and ZnS modifications with high Cd enrichment (up to ~10 wt%) and elevated concentrations of Cu, Sb, Ag, Mo, and Pb. The marbles are composed of calcite, carbonate-fluorapatite, spurrite, and brownmillerite and characterized by high P, Zn, Cd, U, and elevated Se, Ni, V, and Mo contents. Main accessories are either Zn-bearing oxides or sphalerite, greenockite, and Ca-Fe-Ni-Cu-O-S-Se oxychalcogenides. CM alteration lead to compositional homogenization of metamorphic sphalerite, for which trace-element suites become less diverse than in the authigenic ZnS. The CM sphalerites contain up to ~14 wt% Cd and ~6.7 wt% Se but are poor in Fe (means 1.4–2.2 wt%), and bear 100– 250 ppm Co, Ni, and Hg. Sphalerite (Zn,Cd,Fe)(S,O,Se)cub is a homogeneous solid solution with a unit cell smaller than in ZnScub as a result of S2− → O2− substitution (a = 5.40852(12) Å, V = 158.211(6) Å3). The amount of lattice-bound oxygen in the CM sphalerite is within the range for synthetic ZnS1−xOx crystals (0 < x ≤ 0.05) growing at 900 °C.

Язык оригиналаанглийский
Номер статьи822
Страницы (с-по)1-47
Число страниц47
ЖурналMinerals
Том10
Номер выпуска9
DOI
СостояниеОпубликовано - сен 2020

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