scholarly journals South Urals and Rudny Altai: a comparative paleovolcanic and metallogenic analysis

2019 ◽  
Vol 61 (2) ◽  
pp. 3-22
Author(s):  
I. B. Seravkin ◽  
A. M. Kosarev
Keyword(s):  
Volcanic Rocks ◽  
Southern Urals ◽  
Massive Sulphide ◽  
South Urals ◽  
The Urals ◽  
The Southern Urals ◽  
Central Type ◽  
General Terms ◽  
Massive Sulphide Deposits ◽  
Sulphide Deposits

A comparative paleovolcanic and metallogenic analysis of two massive-sulphide-bearing regions, the Southern Urals and Ore Altai, located in different parts of the Ural-Mongolian folded belt, was performed. Comparison of the geodynamic evolution of these areas, the formation and facies composition of the ore-bearing strata and types of massive-sulphide deposits has led to the conclusion that the regions are similar only in the most general terms. Fundamental differences in the structure and composition of the crust of the regions led to differences in the profile of island-arc magmatism: basaltoid in the Southern Urals and rhyolitoid in Ore Altai. This, in its turn, determined the predominant composition of massive-sulphide mineralization: copper-zinc in the first of the regions and polymetallic — in the second. Opposite tendencies in the evolution of volcanism are also characteristic: homodromic in the Southern Urals and antidromic in the Ore Altai, which resulted in a different position of the types of massive-sulphide deposits in the ore districts: the bottom-up change of copper — massive-sulphide deposits by the massive-sulphide -polymetallic in the Southern Urals and barite polymetallic by massive-sulphide polymetallic and copper- massive-sulphide in the Ore Altai. Significant differences are also in the lateral distribution patterns of mineralization: a more pronounced control of mineralization by paleovolcanic structures of the central type in the Southern Urals and the frequent position of mineralization in intermediate and remote facies of volcanism in the Ore Altai, which is reflected in the prevalence of volcanic sections in the Urals and the majority of the volcanic sections and the larger majority of the volcanic rocks in the Ore Altai, which is reflected in the prevalence of volcanic rocks in the Urals and the majority of the volcanic sections and in the Ore Altai most of the volcanic minerals and the larger majority of the mineral rocks (20–80%) in the strata containing mineralization in the Ore Altai.

Ferruginous and manganiferous haloes around massive sulphide deposits of the Urals

2012 ◽  
Vol 47 ◽  
pp. 5-41 ◽  
Author(s):  
V.V. Maslennikov ◽  
N.R. Ayupova ◽  
R.J. Herrington ◽  
L.V. Danyushevskiy ◽  
R.R. Large
Keyword(s):  
Massive Sulphide ◽  
The Urals ◽  
Massive Sulphide Deposits ◽  
Sulphide Deposits

Mineralogy and genesis of calc-silicates associated with Archean volcanogenic massive sulphide deposits at the Manitouwadge mining camp, Ontario

1992 ◽  
Vol 29 (7) ◽  
pp. 1375-1388 ◽  
Author(s):  
Yuanming Pan ◽  
Michael E. Fleet
Keyword(s):  
Regional Metamorphism ◽  
Spatial Association ◽  
Volcanic Rocks ◽  
Granulite Facies ◽  
Massive Sulphide ◽  
Sea Floor ◽  
Massive Sulphide Deposits ◽  
Volcanogenic Massive Sulphide ◽  
Reducing Environment ◽  
Sulphide Deposits

Skarn-like calc-silicate rocks are reported in spatial association with the Archean Cu–Zn–Ag massive sulphide deposits at the Manitouwadge mining camp, Ontario. Calc-silicates in the footwall of the Willroy mine occur as matrix to breccia fragments of garnetiferous quartzo-feldspathic gneiss and as lenses within garnetiferous quartzo-feldspathic gneiss and are composed of clinopyroxene, garnet, calcic amphiboles, wollastonite, plagioclase, K-feldspar, epidote, quartz, calcite, magnetite, and minor sulphides. Calc-silicates within the main orebody of the Geco mine are characterized by clinopyroxene, calcic amphiboles (Cl–K-rich hastingsitic and ferro-edenitic hornblende, ferro-edenite (up to 4.7 wt.% Cl); and ferroactinolite (6.7 wt.% MnO)), garnet, epidote (including an epidote rich in rare-earth elements and Cl), calcite, quartz, and abundant sulphides. Calc-silicates within the basal 4/2 Copper Zone of the Geco mine contain garnet, gahnite, sphalerite, ferroactinolite (8.5 wt.% MnO), epidote, quartz, biotite, plagioclase, chlorite, muscovite, K-feldspar, and pyrosmalite (with Mn/(Mn + Fe) ratio ranging from 0.21 to 0.61, and up to 3.9 wt.% Cl). The calc-silicates probably represent metasomatic remobilization of dispersed Ca (and Cl) from sea-floor hydrothermal alteration of mafic to intermediate volcanic rocks and are only indirectly related to the hypothesized syngenetic ore-forming processes for the associated base metal sulphide deposits. The calc-silicates formed initially at about 600 °C and 3–5 kbar (1 kbar = 100 MPa) in a mildly reducing environment (from 1 log unit above to 1 log unit below the fayalite–magnetite–quartz buffer) during the upper-amphibolite- to granulite-facies regional metamorphism and were altered subsequently at lower temperatures (<500 °C).

Naturally spreading and natural apple dwarfs in the forest-steppe zone of the Southern Urals

2020 ◽  
Vol 62 ◽  
pp. 70-76
Author(s):  
O. E. Merezhko ◽  
M. A. Mazunin ◽  
E. Z. Savin ◽  
A. I. Gridnev
Keyword(s):  
Unit Area ◽  
Steppe Zone ◽  
Southern Urals ◽  
South Urals ◽  
Forest Steppe ◽  
Labor Costs ◽  
The Urals ◽  
The Southern Urals ◽  
Apple Trees ◽  
Early Maturity

The article presents tests of natural creeping apple trees and natural dwarfs, carried out in the in the conditions of the Orenburg region. There were from 50 to 100 trees in the experiment in each variant. Vigorous standard plantations were used as control. The aim of the research was to test natural creeping apple trees, natural dwarfs against the background of standard varieties bred in the South Urals (Chelyabinsk), as well as to determine their prospects for intensive horticulture in the extreme conditions of the region. The preservation of plantings for all variants of the experiment for 20 years of research is high and amounted to 92-99 %, their condition was estimated at 4.5-5.0 points. The highest yield was noted for natural dwarfs (457.2 c/ha), the smallest yield was obtained on vigorous standard plantings (control) – 238.7 c/ha. Naturally creeping apple trees in terms of productivity were higher than control by an average of 25 %. Of the naturally creeping varieties, the most productive were the varieties Podsnezhnik (348.3 c/ha), Chudnoe (335.2 c/ha), the least productive were the varieties Plastun and Kovrovoe (255.1 and 262.5 c/ha, respectively). On the natural dwarfs, the most productive variety was the variety Brat Chudnogo (461.2 c/ha). In the control, the most productive varieties were the varieties Symbol (295.9 c/ha) and Nadezhda (270.5 c/ha), less productive were the varieties Pamyat Zhavoronkova and Fevralskoe (208.0 and 224.1 c/ha, respectively). Low-growing plantations, in particular layer and natural varieties of the Urals, are distinguished by their early maturity and, in general, higher productivity per unit area. The highest labor costs are accounted for by natural dwarfs (485.4 person-day/ha) and the lowest in vigorous plantings (317.4 person-day/ha). This has a positive eff ect on the profit and rentability of production.

Petrogenesis of the 1.9 Ga mafic hanging wall sequence to the Flin Flon, Callinan, and Triple 7 massive sulphide deposits, Flin Flon, Manitoba, CanadaThis is a companion paper to DeWolfe, Y.M., Gibson, H.L., Lafrance , B., and Bailes, A.H. 2009. Volcanic reconstruction of Paleoproterozoic arc volcanoes: the Hidden and Louis formations, Flin Flon, Manitoba, Canada. Canadian Journal of Earth Sciences, 46: this issue.

2009 ◽  
Vol 46 (7) ◽  
pp. 509-527 ◽  
Author(s):  
Y. M. DeWolfe ◽  
H. L. Gibson ◽  
S. J. Piercey
Keyword(s):  
Oceanic Crust ◽  
Basaltic Andesite ◽  
Hanging Wall ◽  
Volcanic Rocks ◽  
Companion Paper ◽  
Massive Sulphide ◽  
Massive Sulphide Deposits ◽  
Volcanogenic Massive Sulphide ◽  
Flin Flon ◽  
Sulphide Deposits

A detailed study of the geochemical and isotopic characteristics of the volcanic rocks of the Hidden and Louis formations, which make up the hanging wall to the volcanogenic massive sulphide deposits at Flin Flon, Manitoba, was carried out on a stratigraphically controlled set of samples. The stratigraphy consists of the lowermost, dominantly basaltic, Hidden formation, and the overlying, dominantly basaltic, Louis formation. Of importance petrogenetically, is the 1920 unit a basaltic andesite with Nb/Thmn = 0.54–0.62, εNd(1.9Ga) = +3.6–+5.9, εHf(1.9Ga) = +8.5–+9.6, and 204Pb/206Pb = 23.9. The basaltic flows that dominate the Hidden formation have Nb/Thmn = 0.16–0.29, εNd(1.9Ga) = +1.7–+4.4, εHf(1.9Ga) = +7.0–+11.8 and 204Pb/206Pb = 16.9–18.6). The Carlisle Lake basaltic–andesite (top of Hidden formation) is characterized by Nb/Thmn = 0.16–0.14, and 204Pb/206Pb = 21.4. The rhyodacitic Tower member (bottom of Louis formation) has Nb/Thmn = 0.23, εNd1.9Ga = +4.6, εHf1.9Ga = +9.3, and 204Pb/206Pb = 22.2. The basaltic flows that dominate the Louis formation have Nb/Thmn = 0.18–0.25, εNd(1.9Ga) = +3.6–+4.2, εHf(1.9Ga) = +8.4–+11.3 and 204Pb/206Pb = 17.9. The Hidden and Louis formations show dominantly transitional arc tholeiite signatures, with the 1920 unit having arc tholeiite characteristics. It is interpreted to have formed through extensive fractional crystallization of differentiated magmas at shallow levels in oceanic crust. Given the geological, geochemical, and isotopic characteristics of the Hidden and Louis formations, they are interpreted to represent subducted slab metasomatism with minor contamination from subducted sediments.

Metamorphism of volcanogenic massive sulphide deposits in the Urals. Ore geology

2017 ◽  
Vol 85 ◽  
pp. 30-63 ◽  
Author(s):  
Ilya V. Vikentyev ◽  
Elena V. Belogub ◽  
Konstantin A. Novoselov ◽  
Vasily P. Moloshag
Keyword(s):  
Massive Sulphide ◽  
The Urals ◽  
Massive Sulphide Deposits ◽  
Volcanogenic Massive Sulphide ◽  
Sulphide Deposits

Types of massive sulphide deposits in the Urals

1998 ◽  
Vol 34 (1) ◽  
pp. 121-126 ◽  
Author(s):  
V. A. Prokin ◽  
F. P. Buslaev ◽  
A. P. Nasedkin
Keyword(s):  
Massive Sulphide ◽  
The Urals ◽  
Massive Sulphide Deposits ◽  
Sulphide Deposits

The geochemistry of altered volcanic rocks at Matagami, Quebec: a geothermal model for massive sulphide genesis

1978 ◽  
Vol 15 (4) ◽  
pp. 551-570 ◽  
Author(s):  
P. J. MacGeehan
Keyword(s):  
Volcanic Rocks ◽  
Aqueous Fluid ◽  
Tholeiitic Basalt ◽  
Massive Sulphide ◽  
Geothermal System ◽  
Alteration Zones ◽  
Massive Sulphide Deposits ◽  
Sulphide Deposits ◽  
Grade Material ◽  
Geothermal Model

Volcanogenic exhalative massive sulphide deposits at Matagami are associated with a bimodal suite of tholeiitic basalt and rhyolite. However, these rocks now exhibit pseudo calc-alkaline alteration trends resulting from a hydrothermal alteration process in which footwall basalt was spilitized, and the host rhyolite was chloritized. These two alteration processes were contemporaneous events, which shared a common aqueous fluid, developed within cooling submarine volcanic rocks shortly after the extrusion of rhyolite, and terminated prior to extrusion of succeeding units.The geochemistry of the Garon Lake rhyolite and underlying basalt are examined in detail. Massive quantities of Fe, Mg and Ti, and over 10 ppm Zn and 5 ppm Cu were leached from basalt during spilitization, providing 30 000 t Zn and 15 000 t Cu, or approximately 1 Mt of ore grade material per km3 of basalt. Chlorite alteration zones and massive sulphide deposits in the overlying rhyolite were enriched in all those elements depleted from basalt. This evidence suggests a geothermal model for massive sulphide genesis, where Fe, Mg, Ti, Cu and Zn were leached from footwall rocks, flushed through a geothermal system, and then precipitated at the discharge point to form chlorite alteration zones in the overlying rhyolite and exhalite deposits at the sediment–seawater interface.

scholarly journals Lead isotopic systematics of massive sulphide deposits in the Urals: Applications for geodynamic setting and metal sources

2016 ◽  
Vol 72 ◽  
pp. 22-36 ◽  
Author(s):  
Svetlana G. Tessalina ◽  
Richard J. Herrington ◽  
Rex N. Taylor ◽  
Krister Sundblad ◽  
Valery V. Maslennikov ◽  
...  
Keyword(s):  
Massive Sulphide ◽  
Geodynamic Setting ◽  
The Urals ◽  
Metal Sources ◽  
Massive Sulphide Deposits ◽  
Sulphide Deposits
Sign in / Sign up

Export Citation Format

Share Document