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Formation of au-bearing antigorite serpentinites and magnetite ores at the massif of ophiolite ultramafic rocks : Thermodynamic modeling. / Murzin, Valery; Chudnenko, Konstantin; Palyanova, Galina et al.

In: Minerals, Vol. 9, No. 12, 758, 12.2019.

Research output: Contribution to journal › Article › peer-review

Harvard

Murzin, V, Chudnenko, K, Palyanova, G & Varlamov, D 2019, 'Formation of au-bearing antigorite serpentinites and magnetite ores at the massif of ophiolite ultramafic rocks: Thermodynamic modeling', Minerals, vol. 9, no. 12, 758. https://doi.org/10.3390/min9120758

APA

Murzin, V., Chudnenko, K., Palyanova, G., & Varlamov, D. (2019). Formation of au-bearing antigorite serpentinites and magnetite ores at the massif of ophiolite ultramafic rocks: Thermodynamic modeling. Minerals, 9(12), [758]. https://doi.org/10.3390/min9120758

Vancouver

Murzin V, Chudnenko K, Palyanova G, Varlamov D. Formation of au-bearing antigorite serpentinites and magnetite ores at the massif of ophiolite ultramafic rocks: Thermodynamic modeling. Minerals. 2019 Dec;9(12):758. doi: 10.3390/min9120758

Author

Murzin, Valery ; Chudnenko, Konstantin ; Palyanova, Galina et al. / Formation of au-bearing antigorite serpentinites and magnetite ores at the massif of ophiolite ultramafic rocks : Thermodynamic modeling. In: Minerals. 2019 ; Vol. 9, No. 12.

BibTeX

@article{ce1b0be946a64937a7a8c9b5e9a9be10,
title = "Formation of au-bearing antigorite serpentinites and magnetite ores at the massif of ophiolite ultramafic rocks: Thermodynamic modeling",
abstract = "We constructed thermodynamic models of the formation of two types of gold-ore mineralization at the Kagan ultramafic massif in the Southern Urals (Russia). The first type of gold-mineralization is widely spread at the massif in the tectonic zones of schistose serpentinites containing typically ≤ 0.1 ppm Au. The second type of gold-ore mineralization is represented by veined massive, streaky and impregnated magnetite ores in contact with serpentinites. It contains to 5 vol.% sulfides and 0.2–1.2 ppm Au. Our thermodynamic calculations explain the formation of two types of gold-ore mineralization in the bedrocks of ultramafic massifs. Metamorphic water, which is the result of the dehydration of early serpentinites (middle Riphean) during high-temperature regional metamorphism (700 °C, 10 kbar) (late Precambrian), is considered as the source of ore-bearing fluid in the models. The metasomatic interaction of metamorphic fluid with serpentinites is responsible for the gold-poor mineralization of the 1st type at T = 450–250 °C and P = 2.5–0.5 kbar. The hydrothermal gold-rich mineralization of the 2nd type was formed during mixing of metamorphic and meteoric fluids at T = 500–400 °C and P = 2–3 kbar and discharge of mixed fluid in the open space of cracks in serpentinites. The model calculations showed that the dominant forms of gold transport in fluids with pH = 3–5 are AuCl2− complexes (≥450 °C) and, as the temperature decreases, AuHS0, or AuOH0. Mineral associations obtained in model calculations are in general similar to the observed natural types of gold mineralization.",
keywords = "Antigorite serpentinites, Fluid regime, Gold mineralization, Kagan ultramafic massif, Magnetite veins, Native gold, Southern Urals, Thermodynamic modeling, antigorite serpentinites, GOLD, TRANSPORT-PROPERTIES, MINERALS, thermodynamic modeling, SOLID-SOLUTIONS, fluid regime, HIGH-PRESSURES, native gold, O-H, SOLUBILITIES, gold mineralization, ORIGIN, magnetite veins, FLUID, TEMPERATURES",
author = "Valery Murzin and Konstantin Chudnenko and Galina Palyanova and Dmitry Varlamov",
year = "2019",
month = dec,
doi = "10.3390/min9120758",
language = "English",
volume = "9",
journal = "Minerals",
issn = "2075-163X",
publisher = "MDPI AG",
number = "12",

}

RIS

TY - JOUR

T1 - Formation of au-bearing antigorite serpentinites and magnetite ores at the massif of ophiolite ultramafic rocks

T2 - Thermodynamic modeling

AU - Murzin, Valery

AU - Chudnenko, Konstantin

AU - Palyanova, Galina

AU - Varlamov, Dmitry

PY - 2019/12

Y1 - 2019/12

N2 - We constructed thermodynamic models of the formation of two types of gold-ore mineralization at the Kagan ultramafic massif in the Southern Urals (Russia). The first type of gold-mineralization is widely spread at the massif in the tectonic zones of schistose serpentinites containing typically ≤ 0.1 ppm Au. The second type of gold-ore mineralization is represented by veined massive, streaky and impregnated magnetite ores in contact with serpentinites. It contains to 5 vol.% sulfides and 0.2–1.2 ppm Au. Our thermodynamic calculations explain the formation of two types of gold-ore mineralization in the bedrocks of ultramafic massifs. Metamorphic water, which is the result of the dehydration of early serpentinites (middle Riphean) during high-temperature regional metamorphism (700 °C, 10 kbar) (late Precambrian), is considered as the source of ore-bearing fluid in the models. The metasomatic interaction of metamorphic fluid with serpentinites is responsible for the gold-poor mineralization of the 1st type at T = 450–250 °C and P = 2.5–0.5 kbar. The hydrothermal gold-rich mineralization of the 2nd type was formed during mixing of metamorphic and meteoric fluids at T = 500–400 °C and P = 2–3 kbar and discharge of mixed fluid in the open space of cracks in serpentinites. The model calculations showed that the dominant forms of gold transport in fluids with pH = 3–5 are AuCl2− complexes (≥450 °C) and, as the temperature decreases, AuHS0, or AuOH0. Mineral associations obtained in model calculations are in general similar to the observed natural types of gold mineralization.

AB - We constructed thermodynamic models of the formation of two types of gold-ore mineralization at the Kagan ultramafic massif in the Southern Urals (Russia). The first type of gold-mineralization is widely spread at the massif in the tectonic zones of schistose serpentinites containing typically ≤ 0.1 ppm Au. The second type of gold-ore mineralization is represented by veined massive, streaky and impregnated magnetite ores in contact with serpentinites. It contains to 5 vol.% sulfides and 0.2–1.2 ppm Au. Our thermodynamic calculations explain the formation of two types of gold-ore mineralization in the bedrocks of ultramafic massifs. Metamorphic water, which is the result of the dehydration of early serpentinites (middle Riphean) during high-temperature regional metamorphism (700 °C, 10 kbar) (late Precambrian), is considered as the source of ore-bearing fluid in the models. The metasomatic interaction of metamorphic fluid with serpentinites is responsible for the gold-poor mineralization of the 1st type at T = 450–250 °C and P = 2.5–0.5 kbar. The hydrothermal gold-rich mineralization of the 2nd type was formed during mixing of metamorphic and meteoric fluids at T = 500–400 °C and P = 2–3 kbar and discharge of mixed fluid in the open space of cracks in serpentinites. The model calculations showed that the dominant forms of gold transport in fluids with pH = 3–5 are AuCl2− complexes (≥450 °C) and, as the temperature decreases, AuHS0, or AuOH0. Mineral associations obtained in model calculations are in general similar to the observed natural types of gold mineralization.

KW - Antigorite serpentinites

KW - Fluid regime

KW - Gold mineralization

KW - Kagan ultramafic massif

KW - Magnetite veins

KW - Native gold

KW - Southern Urals

KW - Thermodynamic modeling

KW - antigorite serpentinites

KW - GOLD

KW - TRANSPORT-PROPERTIES

KW - MINERALS

KW - thermodynamic modeling

KW - SOLID-SOLUTIONS

KW - fluid regime

KW - HIGH-PRESSURES

KW - native gold

KW - O-H

KW - SOLUBILITIES

KW - gold mineralization

KW - ORIGIN

KW - magnetite veins

KW - FLUID

KW - TEMPERATURES

UR - http://www.scopus.com/inward/record.url?scp=85076591728&partnerID=8YFLogxK

U2 - 10.3390/min9120758

DO - 10.3390/min9120758

M3 - Article

AN - SCOPUS:85076591728

VL - 9

JO - Minerals

JF - Minerals

SN - 2075-163X

IS - 12

M1 - 758

ER -

ID: 23092151