Formation conditions, composition and ore-forming sources of the Bolshoy Karan gold-porphyry deposit (the Southern Urals)

Знаменский, Сергей Евгеньевич; Ankusheva, N. N.; Artem’ev, D. A.

doi:10.24930/1681-9004-2020-20-3-397-410

Lithosphere

2020

DOI: 10.24930/1681-9004-2020-20-3-397-410

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Formation conditions, composition and ore-forming sources of the Bolshoy Karan gold-porphyry deposit (the Southern Urals)

Сергей Евгеньевич Знаменский¹,

N. N. Ankusheva²,

D. A. Artem’ev³

Abstract: Объект исследований. Исследовались условия формирования, состав и источники золото-порфирового месторождения Большой Каран, расположенного в зоне Главного Уральского разлома на Южном Урале. Методы. С помощью термокамеры Linkam TMS-600 и микроскопа Olympus BX 51 оценивались температуры минералообразования, солевой состав и концентрации солей во флюидных включениях. Газовый состав флюида определен на рамановском спектрометре Horiba LabRam HR800 Evolution с микроскопом Olympus BX-FM. Методом LA-ICP-MS исследованы… Show more

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Cited by 3 publications

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Petrological and geochemical characteristic of the rocks of the Voznesensky intrusive massif (Southern Urals): Оn the question of the composition and sources of magma producing gold and copper porphyry mineralization

Znamensky

2021

Lithosphere

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Research subject. The petrological and geochemical features of the rocks of the Voznesensky intrusive massif and its dyke series were studied in order to clarify the composition, possible sources and geodynamic settings of magma generation that produced Au- and Cu-porphyry mineralization.Methods. The content of petrogenic oxides was determined by the chemical method, trace elements – by ICP-MS analysis.Results. Among the rocks of the Voznesensky massif, which have the geochemical characteristics of suprasubduction formations, varieties with calc-alkaline and adakite-like properties were established. The main phase of the massif is represented by gabbro-diorites and diorites belonging to the calc-alkaline series. Ore-bearing dykes of gabbro-diorites, diorites and granodiorites of the Au-porphyry Bolshekaransky deposit are of calc-alkaline composition, while the post-ore dykes of granodiorites and plagiogranites of this deposit exhibit adakite-like characteristics.Conclusions. The ore-bearing dyke series of the Voznesensky deposit is represented by calc-alkaline diorites and adakite-like granodiorites and plagiogranites. The metallogenic specialization of the dykes was influenced by the silicic acidity and the redox state of the ore-generating melts. Granitoids with Cu-porphyry mineralization, compared to their gold-bearing varieties, crystallized from more acidic melts with a higher degree of oxidation. It is assumed that the main mantle component of magmas for the Voznesensky rocks were relatively weakly depleted spinel peridotites of the suprasubduction lithospheric mantle. Calc-alkaline magmas were melted from a mantle substrate previously metasomatized by aqueous fluids, and magmas with adakite-like properties – metamorphosed by melts of basalts and sedimentary rocks of slab. Melting of slab rocks may have been associated with additional heating due to friction caused by changes in direction and/or velocity of oblique subduction.

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Petrological and geochemical characteristic of the rocks of the Voznesensky intrusive massif (Southern Urals): Оn the question of the composition and sources of magma producing gold and copper porphyry mineralization

Znamensky

2021

Lithosphere

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Generation and alteration conditions, fluid regime features of the ore-magmatic system of the South Saryshagan granite intrusion (Western Balkhash region)

Shardakova,

Korovko,

Antonishin

2023

Lithosphere

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Research subject. For the first time, the mineral composition, petro- and geochemical features, generation and metasomatic alteration conditions, fluid regime (based on the behavior of F, Sl, and S in apatites), and ore-generating potential of granitoids from the South Saryshagan intrusion (Western Balkhash) were studied. Materials and methods. X-ray fluorescence and atomic emission methods of rock analysis (drilling well core), as well as microprobe (polished sections) studies of mineral composition. Results. The rock composition was found to correspond to moderately alkaline granites, formed at a generation pressure of about 2 kbar and T = 670°C. Subsequent metasomatic transformations were mediumtemperature (313–350°C) and multistage, i.e., phyllitization followed by chloritization. The ferrous composition of chlorite and the confinement of its development area to fracture zones indicate the local scale of the process. Ore mineralization is mainly represented by chalcopyrite, occasionally containing Au. According to the morphology and composition features, apatites from granites can be divided into two groups, i.e., magmatogenic grains and products of their transformations. In a diagram of F-Cl-S ratios, most points of their composition lie in the fields of rocks productive of Cu-porphyry mineralization. Conclusions. Mineral associations and the analysis of F, Cl, and S behavior in apatites indicate changes in the composition of the fluid phase over time under the conditions of an open system. In apatites, sulfur accumulates to the maximum level (0.012 wt % S) simultaneously with an increase in the amount of Cl and a decrease in the amount of F. After S reaches this level, the Cl content in apatites decreases followed by a notable increase in F; as a result, the late portions of the fluid become depleted of F, but enriched with Cl and S. In general, the content of the latter two components is low, compared with that typical of rich Cu–porphyry systems. Since the amount of mobilized copper depends on both the contents of Cl and S in the fluid and the volume of this fluid (determined by the size of the intrusion itself; in our case, it is a small body), the predicted copper reserves in the upper horizons of the South Saryshagan intrusion are small.

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Mineralogy and Geochemistry of Diorites and Quartz Diorites of the Bolshoy Karan Gold-Porphyry Deposit in the Southern Urals

2022

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The paper provides information on the chemical composition of intrusive diorites the gold-porphyry deposit of Bolshoy Karan, located in the northern part of the Voznesensk-Prisakmar structural zone (MUF), in the north of the Uchaly ore district. Additional information is given on 1) primary magmatic, 2) accessory, 3) hydrothermal-metasomatic and 4) ore minerals. Special attention is paid to the geochemical features of accessory minerals from the ore-bearing zone diorites. According to the Nb/Yb and Th/Yb ratios in gabbroids, taking into account other materials, geodynamic reconstructions were carried out, as a result of which groups of gabbro-diorites formed in the Voznesensk-Prisakmar zone in areas with oceanic, island-arc and subcontinental types of crust, smelted from depleted and enriched mantle sources, were identified. The Bolshekaran-Voznesensk-Karagaikul ore-bearing zone is confined to an area with a thick crust of the island-arc or subcontinental type.

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Formation conditions, composition and ore-forming sources of the Bolshoy Karan gold-porphyry deposit (the Southern Urals)

Cited by 3 publications

References 14 publications

Petrological and geochemical characteristic of the rocks of the Voznesensky intrusive massif (Southern Urals): Оn the question of the composition and sources of magma producing gold and copper porphyry mineralization

Petrological and geochemical characteristic of the rocks of the Voznesensky intrusive massif (Southern Urals): Оn the question of the composition and sources of magma producing gold and copper porphyry mineralization

Generation and alteration conditions, fluid regime features of the ore-magmatic system of the South Saryshagan granite intrusion (Western Balkhash region)

Mineralogy and Geochemistry of Diorites and Quartz Diorites of the Bolshoy Karan Gold-Porphyry Deposit in the Southern Urals

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