scholarly journals Physicochemical Model of Formation of Gold-Bearing Magnetite-Chlorite-Carbonate Rocks at the Karabash Ultramafic Massif (Southern Urals, Russia)

Minerals ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 306 ◽  
Author(s):  
Valery Murzin ◽  
Konstantin Chudnenko ◽  
Galina Palyanova ◽  
Aleksandr Kissin ◽  
Dmitry Varlamov
Keyword(s):  
Carbon Dioxide ◽  
Carbonate Rocks ◽  
Southern Urals ◽  
Ultramafic Rocks ◽  
Physicochemical Model ◽  
The Southern Urals ◽  
Model Calculations ◽  
Ultramafic Massif ◽  
Copper Gold ◽  
Gold Bearing

We present a physicochemical model for the formation of magnetite-chlorite-carbonate rocks with copper gold in the Karabash ultramafic massif in the Southern Urals, Russia. The model was constructed based on the formation geotectonics of the Karabash massif, features of spatial distribution of metasomatically altered rocks in their central part, geochemical characteristics and mineral composition of altered ultramafic rocks, data on the pressure and temperature conditions of formation, and composition of the ore-forming fluids. Magnetite-chlorite-carbonate rocks were formed by the hydrothermal filling of the free space, whereas chloritolites were formed by the metasomatism of the serpentinites. As the source of the petrogenic and ore components, we considered rocks (serpentinites, gabbro, and limestones), deep magmatogenic fluids, probably mixed with metamorphogenic fluids released during dehydration and deserpentinization of rocks in the lower crust, and meteoric waters. The model supports the involvement of sodium chloride-carbon dioxide fluids extracting ore components (Au, Ag, and Cu) from deep-seated rocks and characterized by the ratio of ore elements corresponding to Clarke values in ultramafic rocks. The model calculations show that copper gold can also be deposited during serpentinization of deep-seated olivine-rich rocks and ore fluids raised by the tectonic flow to a higher hypsometric level. The results of our research allow predicting copper gold-rich ore occurrences in ultramafic massifs.

The Sr isotopic characterization and Pb-Pb age of carbonate rocks from the Satka formation, the Lower Riphean Burzyan Group of the southern Urals

2008 ◽  
Vol 16 (2) ◽  
pp. 120-137 ◽  
Author(s):  
A. B. Kuznetsov ◽  
G. V. Ovchinnikova ◽  
M. A. Semikhatov ◽  
I. M. Gorokhov ◽  
O. K. Kaurova ◽  
...  
Keyword(s):  
Carbonate Rocks ◽  
Southern Urals ◽  
The Southern Urals ◽  
Lower Riphean ◽  
Isotopic Characterization ◽  
Burzyan Group

Origin of Au-bearing rodingite in the Karabash massif of alpine-type ultramafic rocks in the southern Urals

2013 ◽  
Vol 55 (4) ◽  
pp. 278-297 ◽  
Author(s):  
V. V. Murzin ◽  
D. A. Varlamov ◽  
Yu. L. Ronkin ◽  
S. N. Shanina
Keyword(s):  
Southern Urals ◽  
Ultramafic Rocks ◽  
The Southern Urals

scholarly journals GOLD-JASPEROID MINERALIZATION IN ZONE OF THE SHARTYMSKIY FAULT (SOUTH URALS)

2020 ◽  
Vol 19 (3) ◽  
pp. 275-281
Author(s):  
P. V. Kazakov ◽  
Keyword(s):  
Southern Urals ◽  
South Urals ◽  
Weathering Crust ◽  
The Southern Urals ◽  
Lower Carboniferous ◽  
Stage Of Development ◽  
Deposit Type ◽  
Economic Concentration ◽  
Carboniferous Limestone ◽  
Gold Bearing

The Shartymskiy Graben was formed at zone of the Shartymskiy Fault in the late collision stage of development of the Southern Urals on the joint of the Western and Eastern Magnitogorsk sub-zone in conditions of variable compression and stretching, and was made with the Lower Carboniferous limestone. Occurrences of gold-bearing metasomatites (jasperoids, sericite-chlorite-carbonate-quartz, sericite-quartz) have been established in the precontact zones of carbonates, gabbro-dolerites, diorites dykes, and small intrusions of sub-alkaline leuсograniteporphirs of the Shartymskiy massif. Mediated connection with them of gold sprouts is established. The gold economic concentration of the Vorontsovskiy deposit type is expected on the certain sections of metasomatites of jasperoid association and their weathering crust.

Formation Conditions of Ferromagnesian Metasomatic Carbonates in the Lower Riphean Terrigenous–Carbonate Rocks of the Southern Urals

2019 ◽  
Vol 54 (3) ◽  
pp. 248-261
Author(s):  
M. T. Krupenin ◽  
S. V. Michurin ◽  
A. A. Sharipova ◽  
A. A. Garaeva ◽  
D. A. Zamyatina ◽  
...  
Keyword(s):  
Carbonate Rocks ◽  
Southern Urals ◽  
The Southern Urals ◽  
Lower Riphean ◽  
Formation Conditions

Co–Ni arsenide deposits, with accessory gold, in ultramafic rocks from Morocco

1986 ◽  
Vol 23 (10) ◽  
pp. 1592-1602 ◽  
Author(s):  
Marc Leblanc
Keyword(s):  
Upper Mantle ◽  
Carbonate Rocks ◽  
Ultramafic Rocks ◽  
Hydrothermal Solutions ◽  
Average Content ◽  
Mantle Origin ◽  
Upper Proterozoic ◽  
Mantle Peridotites ◽  
Gold Bearing

A type of Co–Ni arsenide deposit with accessory gold and no silver can be recognized in ultramafic massifs of upper mantle origin. The Bou Azzer deposits (50 000 t Co) are distributed along the borders of serpentinite massifs in an Upper Proterozoic ophiolite (Anti-Atlas, Morocco). They consist of quartz–carbonate lenses with Co (Ni–Fe) arsenides. Gold is related to the skutterudite (8–15 ppm average content). In the Alpine lherzolite massif of Beni Bousera (Rif, Morocco) are found small chromite–Ni arsenides veins (300 t Ni) with accessory gold. They are associated with late orthopyroxene–vermiculite dikes. Several occurrences of As, arsenides, and gold-bearing carbonate rocks are found in serpentinites from various ophiolites. It is proposed that gold was leached by As- and Co2-rich hydrothermal solutions related to the serpentinization of mantle peridotites.

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