Zhidoy Alkali-Ultramafic Rock and Carbonatite Massif: Geochemical Features, Its Sources Aednd Ore-Bearing

2021 ◽  
pp. 49-62
Author(s):  
N. V. Vladykin ◽  
I. A. Sotnikova ◽  
N. V. Alymova
Keyword(s):  
Ultramafic Rock

Two ultramafic rock types in the Hongseong area, South Korea: Tectonic significance for northeast Asia

Lithos ◽  
2013 ◽  
Vol 175-176 ◽  
pp. 30-39 ◽  
Author(s):  
J. Seo ◽  
C.W. Oh ◽  
S.G. Choi ◽  
V.J. Rajesh
Keyword(s):  
South Korea ◽  
Ultramafic Rock ◽  
Northeast Asia ◽  
Rock Types ◽  
Tectonic Significance

scholarly journals Metamorphic evolution and U-Pb zircon SHRIMP geochronology of the Belizário ultramafic amphibolite, Encantadas Complex, southernmost Brazil

2003 ◽  
Vol 75 (3) ◽  
pp. 393-403 ◽  
Author(s):  
Léo A. Hartmann ◽  
João O.S. Santos ◽  
Jayme A.D. Leite ◽  
Carla C. Porcher ◽  
Neal J. Mcnaughton
Keyword(s):  
Ultramafic Rock ◽  
Greenschist Facies ◽  
Amphibolite Facies ◽  
Rio De La Plata ◽  
Metamorphic Evolution ◽  
Río De La Plata ◽  
La Plata ◽  
Shrimp Geochronology ◽  
Facies Metamorphism ◽  
Magnesian Basalt

The integrated investigation of metamorphism and zircon U-Pb SHRIMP geochronology of the Belizário ultramafic amphibolite from southernmost Brazil leads to a better understanding of the processes involved in the generation of the Encantadas Complex. Magmatic evidence of the magnesian basalt or pyroxenite protolith is only preserved in cores of zircon crystals, which are dated at 2257 ± 12 Ma. Amphibolite facies metamorphism M1 formed voluminous hornblende in the investigated rock possibly at 1989 ± 21 Ma. This ultramafic rock was re-metamorphosed at 702±21 Ma during a greenschist facies eventM2; the assemblage actinolite + oligoclase + microcline + epidote + titanite + monazite formed by alteration of hornblende. The metamorphic events are probably related to the Encantadas Orogeny (2257±12 Ma) and Camboriú Orogeny (~ 1989 Ma) of the Trans-Amazonian Cycle, followed by an orogenic event (702±21 Ma) of the Brasiliano Cycle. The intervening cratonic period (2000-700 Ma) corresponds to the existence of the Supercontinent Atlantica, known regionally as the Rio de la Plata Craton.

scholarly journals Preliminary investigations on the carbon dioxide sequestering potential of the ultramafic rock

1997 ◽  
Author(s):  
F. Goff ◽  
G. Guthrie ◽  
D. Counce ◽  
E. Kluk ◽  
D. Bergfeld ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Ultramafic Rock

Ultramafic Breccias from the Musa Valley, Eastern Papua

1961 ◽  
Vol 98 (1) ◽  
pp. 1-26 ◽  
Author(s):  
D. H. Green
Keyword(s):  
Ultramafic Rock ◽  
Country Rock ◽  
Parental Magma ◽  
Olivine Gabbro ◽  
Direct Crystallization ◽  
The Matrix ◽  
Fluid Environment ◽  
Valley Area ◽  
Rock Minerals ◽  
Layered Sequence

AbstractIn the Musa Valley area rocks of the Papuan Ultramafic Belt outcrop discontinuously over an area of 25 miles by 45 miles. The rocks are part of a folded layered sequence ranging from magnesian dunite and peridotite, chemically and petrographically typical of the alpine ultramafic suite, to olivine gabbro and bytownite gabbro. Agglomerate like breccias consisting of fragments of ultramafic rock in a variable matrix occur as irregular vent-like bodies in the peridotite and dunite and as horizontal sheets in a Pleistocene-Recent sedimentary sequence. The breccias are interpreted as vent and extrusive breccias resulting from the penetration, brecciation and local entrainment (fluidization) of peridotitic country rock by volcanic gases. Olivine alkali basalt was probably the parental magma responsible for the gaseous activity. The breccias show a sequence of stability fields for the assemblages mesh-texture serpentine and bastite (i.e. chrysotile and lizardite mixtures); antigorite; olivine and enstatite; and these are correlated qualitatively with variation in intensity of the brecciation process. Chemically the brecciation process was responsible for the addition of H2O, SiO2, CO2, Al2O3 and O2 and the removal of Fe and Mg from the fragmented rock. Minerals which are of direct crystallization in the matrix fluid environment include chalcedony, fibrous serpentine (chrysotile), magnesite, quartz, andradite, and garnierite. There is no evidence of the presence of an ultramafic, serpentine magma in the genesis of the breccias.

scholarly journals Removal of Cu (II) from Industrial Wastewater Using Mechanically Activated Serpentinite

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2228
Author(s):  
Petros Petrounias ◽  
Aikaterini Rogkala ◽  
Panagiota P. Giannakopoulou ◽  
Paraskevi Lampropoulou ◽  
Petros Koutsovitis ◽  
...  
Keyword(s):  
Los Angeles ◽  
Industrial Wastewater ◽  
Ultramafic Rock ◽  
Selective Removal ◽  
Environmental Applications ◽  
Ultramafic Rocks ◽  
Pit Lakes ◽  
Geochemical Analyses ◽  
Acidic Wastewater ◽  
Toxic Load

We investigate with this study the effectiveness of mechanically activated serpentinite in capturing Cu (II) from the multi-constituent acidic wastewater of the pit lakes of the Agios Philippos mine (Greece), proposing specific areas with serpentinites suitable for such environmental applications. For this purpose ultramafic rock samples that are characterized by variable degrees of serpentinization from ophiolitic outcrops exposed in the regions of Veria-Naousa and Edessa have been examined regarding their capacity to remove the toxic load of Cu (II) from wastewater after having been mechanically activated through a Los Angeles (LA) machine (500, 1000 and 1500 revolutions). The more serpentinized and mechanically activated samples, as they have been characterized after a combination of various mineralogical, petrographic, geochemical analyses as well as after different stresses of abrasion and attrition, seem to be more effective in Cu removal than the less serpentinized ones. Selective removal of Cu (II) in the wroewolfeite phase was obtained by using the mechanically activated highly serpentinized ultramafic rocks. Furthermore, areas with highly serpentinized ultramafic rocks defined after petrographic mapping, using GIS method, which can potentially be used as filters for the effective Cu (II) removal from industrial wastewater are suggested.

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