Research output: Contribution to journal › Article › peer-review
Mustard gold of the gaching ore deposit (Maletoyvayam ore field, Kamchatka, Russia). / Tolstykh, Nadezhda D.; Palyanova, Galina A.; Bobrova, Ol’Ga V. et al.
In: Minerals, Vol. 9, No. 8, 489, 01.08.2019.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Mustard gold of the gaching ore deposit (Maletoyvayam ore field, Kamchatka, Russia)
AU - Tolstykh, Nadezhda D.
AU - Palyanova, Galina A.
AU - Bobrova, Ol’Ga V.
AU - Sidorov, Evgeny G.
N1 - Publisher Copyright: © 2019 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2019/8/1
Y1 - 2019/8/1
N2 - The Gaching high-sulfidation (HS) epithermal Au–Ag deposits, part of the Maletoyvayam ore field, which is located in the volcanic belts of the Kamchatka Peninsula (Russia). The main ore components are native gold, tellurides, selenides, and sulphoselenotellurides of Au and oxidation products of Au-tellurides. This study examines the different types of native gold in this ore deposit and the mechanisms and sequential transformation of calaverite (AuTe2) into mustard gold. The primary high fineness gold (964‰–978‰) intergrown with maletoyvayamite Au3Te6Se4 and other unnamed phases (AuSe, Au(Te,Se)) differ from the secondary (mustard) gold in terms of fineness (1000‰) and texture. Primary gold is homogeneous, whereas mustard is spongy. Two types of mustard gold were identified: a) Mixtures of Fe-Sb(Te,Se,S) oxides and fine gold particles, which formed during the hypogenic transformation stage of calaverite due to the impact of hydrothermal fluids, and b) spotted and colloform gold consisting of aggregates of gold particles in a goethite/hydrogoethite matrix. This formed during the hypergenic transformation stage. Selenides and sulphoselenotellurides of gold did not undergo oxidation. Pseudomorphic replacement of calaverite by Au-Sb(Te,Se,S,As) oxides was also observed.
AB - The Gaching high-sulfidation (HS) epithermal Au–Ag deposits, part of the Maletoyvayam ore field, which is located in the volcanic belts of the Kamchatka Peninsula (Russia). The main ore components are native gold, tellurides, selenides, and sulphoselenotellurides of Au and oxidation products of Au-tellurides. This study examines the different types of native gold in this ore deposit and the mechanisms and sequential transformation of calaverite (AuTe2) into mustard gold. The primary high fineness gold (964‰–978‰) intergrown with maletoyvayamite Au3Te6Se4 and other unnamed phases (AuSe, Au(Te,Se)) differ from the secondary (mustard) gold in terms of fineness (1000‰) and texture. Primary gold is homogeneous, whereas mustard is spongy. Two types of mustard gold were identified: a) Mixtures of Fe-Sb(Te,Se,S) oxides and fine gold particles, which formed during the hypogenic transformation stage of calaverite due to the impact of hydrothermal fluids, and b) spotted and colloform gold consisting of aggregates of gold particles in a goethite/hydrogoethite matrix. This formed during the hypergenic transformation stage. Selenides and sulphoselenotellurides of gold did not undergo oxidation. Pseudomorphic replacement of calaverite by Au-Sb(Te,Se,S,As) oxides was also observed.
KW - Au-Sb(Te,Se,S,As)-oxides
KW - Calaverite
KW - Fe-Sb(Te,As,Se,S)-oxides
KW - Gaching ore deposit
KW - Maletoyvayamite
KW - Mustard gold
KW - TRANSFORMATION
KW - TE MINERALIZATION
KW - MECHANISM
KW - S)-oxides
KW - As)-oxides
KW - Fe-Sb(Te
KW - HEBEI PROVINCE
KW - mustard gold
KW - As
KW - Se
KW - S
KW - AU
KW - KINETICS
KW - calaverite
KW - maletoyvayamite
KW - Au-Sb(Te
UR - http://www.scopus.com/inward/record.url?scp=85073285162&partnerID=8YFLogxK
U2 - 10.3390/min9080489
DO - 10.3390/min9080489
M3 - Article
AN - SCOPUS:85073285162
VL - 9
JO - Minerals
JF - Minerals
SN - 2075-163X
IS - 8
M1 - 489
ER -
ID: 21860790