TY - JOUR

T1 - Ultrahigh-temperature sphalerite from zn-cd-se-rich combustion metamorphic marbles, daba complex, central Jordan: Paragenesis, chemistry, and structure

AU - Sokol, Ella V.

AU - Kokh, Svetlana N.

AU - Seryotkin, Yurii V.

AU - Deviatiiarova, Anna S.

AU - Goryainov, Sergey V.

AU - Sharygin, Victor V.

AU - Khoury, Hani N.

AU - Karmanov, Nikolay S.

AU - Danilovsky, Victoria A.

AU - Artemyev, Dmitry A.

N1 - Publisher Copyright: © 2020 by the authors. Licensee MDPI, Basel, Switzerland. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/9

Y1 - 2020/9

N2 - 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.

AB - 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.

KW - Combustion metamorphism

KW - Greenockite

KW - Mottled Zone

KW - Sphalerite

KW - Trace elements

KW - Würtzite

KW - ZnS

KW - combustion metamorphism

KW - URANIUM

KW - sphalerite

KW - MINERALS

KW - SOLID-SOLUTIONS

KW - wurtzite

KW - CARBOTHERMIC REDUCTION

KW - PHASE-EQUILIBRIA

KW - HATRURIM-FORMATION

KW - PYROMETAMORPHIC ROCKS

KW - greenockite

KW - SULFIDE

KW - trace elements

KW - BASIN

KW - SYSTEM ZNS

UR - http://www.scopus.com/inward/record.url?scp=85091168800&partnerID=8YFLogxK

U2 - 10.3390/min10090822

DO - 10.3390/min10090822

M3 - Article

AN - SCOPUS:85091168800

VL - 10

SP - 1

EP - 47

JO - Minerals

JF - Minerals

SN - 2075-163X

IS - 9

M1 - 822

ER -