scholarly journals Dyke Rocks of the Korsun-Novomyrhorod Anorthosite-Rapakivigranite Pluton

2021 ◽  
pp. 36-47
Author(s):  
S.G. Kryvdik ◽  
◽  
O.V. Dubyna ◽  
V.M. Belskyy ◽  
◽  
...  
Keyword(s):  
Chemical Composition ◽  
Sio2 Content ◽  
Rapakivi Granite ◽  
Granite Pluton ◽  
Basic Composition ◽  
Elevated Content ◽  
Significant Intensity ◽  
Plutonic Rocks

In spite of significant intensity and composition variability of dyke magmatism in the Ingul mega-block, in the Korsun- Novomyrhorod anorthosite-rapakivi granite pluton (KNP) dyke magmatism is restricted. To present day, dykes of basic composition have not been described in this pluton. Previously mentioned gabbro-diabases dykes or diabase porphyrites should be classified as medium rocks as well as they are enriched by SiO2, Na2O and K2O. The authors succeeded studied the dyke from the Nosachiv massif, which can be considered the only known dyke of basic composition in KNP. By chemical composition, this rock is similar to the Ti-enriched gabroids of KNP, but differs in the presence of high-Ti magnetite (not typical mineral in plutonic rocks of KNP), and in terms of SiO2 and Na2O + K2O it should be classified as subalkaline. Most of the dikes known in the KNP are mainly monzonites, monzosienites, less widespread syenites, granite dikes are quite rare too. As our studies have shown, in the previously described porphyry dykes diabase structure is not exihibited. Furthermore pyroxene content is the first percent, and a significant (or most) of them are probably xenogeneic. According to chemical composition such dykes should be classified as medium in composition, because the SiO2 content in them is in the range of 54-60 % and elevated content of K2O, often prevails over Na2O, by low MgO and higher TiO2 they are similar to gabroid of KNP. In these rocks, normative orthoclase and quartz are calculated in significant quantities. Therefore, we offer to consider these rocks as dyke analogues of monzonites (quartz-containing or quartz) and regard as monzonite porphyry. The significant distribution of monzonites and syenites and their dyke analogues denote clear pronounced monzonite-syenite trend of evolution in KNP.

Petrological Features of Korsun'-Novomyrhorod Anorthosite-Rapakivi Granite Pluton

2021 ◽  
Vol 43 (4) ◽  
pp. 25-49
Author(s):  
S.G. KRYVDIK ◽  
O.V. DUBYNA ◽  
P.F. YAKUBENKO
Keyword(s):  
High Alumina ◽  
Crustal Material ◽  
Rapakivi Granite ◽  
Granite Pluton ◽  
Number Of Factors ◽  
Erosion Level ◽  
Granite Magmatism ◽  
Geochemical Studies ◽  
Lower Crustal ◽  
Basic Rocks

The Korsun’-Novomyrhorod pluton is the second after the Korosten one in terms of the scale of Proterozoic (1757-1748 Ma) anorthosite-rapakivi-granite magmatism in the Ukrainian Shield. According to geochronological data, pluton was formed as a result of multiple ascending and crystallization of basic to acidic melts. Differentiation of initial melts because to be responsible for gabbro-anorthosite and monzonites series crystallization. Whereas rapakivi granites, which are predominate in the modern erosion level, were formed from felsic magma not directly related with differentiation of basic melt. In view of the current level of mineralogical research, it is difficult to use modern geobarometry methods to reliably estimate the depth of rocks crystallization. At the same time, a number of factors (absence of volcanic and dike analogues of basic rocks, insignificant distribution of pegmatite bodies, predominance of high-Fe mafic minerals, absence of primary magnetite, etc.) indicate deeper conditions for rocks disclosed by modern erosional cut in comparition to similar Korosten pluton. Therefore, the liquid line of dissent, petrological and mineralogical features of the rocks can be explained by the reducing (low fO2) or abyssal conditions of their formation. It is possible that the deeper conditions of crystallization of parental melt are due to more distinctly developed syenitic trend of evolution with the appearance of high-Fe syenites during final stages. Preliminary data indicate on possibility of vertical layering of gabbro-anorthosite massifs, which manifested by increasing proportion of high-Fe basic rocks with depth. Available isotope-geochemical studies do not provide unambiguous data on regarding reservoirs of primary melts implaying both mantle and mixed mantle-crustal their origin. The evolution of the petrochemical features of basic rocks, in our opinion, is in better agreement with their formation as result of differentiation of the primary high-alumina tholeiitic melt, significantly contaminated by lower crustal material. This determined the subalkaline nature of basic rocks and a significant predominance of norites, in comparition to more typical gabbros, and monzonites. In contrast to the previously proposed hypotheses of the formation of intermediate rocks because of partial melting of felsic rocks by basic intrusions, or mingling of basic and acidic melts, some of petrochemical features and geological position can be satisfactorily explained by their crystallization from the residual melt.

scholarly journals PETROTYPES OF SANDSTONES OF THE SHESHMINSKY HORIZON IN THE SOUTHWESTERN PART OF THE SOLIKAMSK DEPRESSION

2021 ◽  
Author(s):  
D.E. Trapeznikov ◽  
Keyword(s):  
Clastic Material ◽  
Southwestern Part ◽  
Basic Composition ◽  
Plutonic Rocks ◽  
Main Components

The results of petrographic studies of sandstones of the Sheshminsky horizon are presented. The main components of the clastic phase have been determined. The studied section contains only lithite arenites, among which five petrographic varieties have been identified. The source of clastic material was probably five different complexes: volcanic and plutonic rocks of intermediate and basic composition, sedimentary, metamorphic and quartzite sequences

scholarly journals Relationships Between Chemical Composition of Colostrum and Milk and Rearing Performance of Piglets During a 21-Day Lactation / Zależności Pomiędzy Składem Chemicznym Siary I Mleka A Wynikami Odchowu Prosiąt W Czasie 21-Dniowej Laktacji

2013 ◽  
Vol 13 (4) ◽  
pp. 771-781 ◽  
Author(s):  
Magdalena Szyndler-Nędza ◽  
Marian Różycki ◽  
Robert Eckert ◽  
Aurelia Mucha ◽  
Mirosław Koska ◽  
...  
Keyword(s):  
Weight Gain ◽  
Chemical Composition ◽  
Cell Count ◽  
Milk Fat ◽  
Somatic Cell Count ◽  
Crude Protein ◽  
Normal Development ◽  
Large White ◽  
Basic Composition ◽  
Udder Health

Abstract Normal development of piglets is determined principally by the milking ability of the sows. This study attempted to determine the relationships between sow’s milk quality and rearing performance of the piglets. The experiment was carried out under uniform conditions, with standard feeding of the sows and a similar number of piglets per litter. The study accounted for 109 lactations of second- and third-parity Polish Large White (PLW ) sows and 123 lactations of second- and third-parity Polish Landrace (PL) sows. Colostrum and milk were collected from the sows at 1, 7, 14 and 21 days of lactation and analysed for solids, crude protein, fat, lactose and somatic cell count (SCC). Rearing performance of second- and third-litter piglets was determined based on the number and weight of piglets at birth and at 7, 14 and 21 days of age. The coefficients of correlation, estimated between basic composition of milk and rearing performance of the piglets over subsequent weeks of lactation were low and exceeded r = 0.200 only for some traits. The experiment showed that a higher content of basic milk components, in particular protein, may be one of the factors contributing to an increase in weight gain of piglets during a 21-day lactation. Milk fat content may be of significance for rearing performance of piglets only during their first week of life. Rearing performance of the piglets is unrelated to udder health expressed as milk SCC.

scholarly journals Fe-Ti Oxide Assemblages from the Contact-Metamorphosed Mafic-Ultramafic Rocks of the Sedova Zaimka Intrusion (Western Siberia, Russia): The Tracking of Metamorphic Transformations

Minerals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 253 ◽  
Author(s):  
Tatyana V. Svetlitskaya ◽  
Peter A. Nevolko ◽  
Pavel A. Fominykh
Keyword(s):  
Western Siberia ◽  
Amphibolite Facies ◽  
Contact Metamorphism ◽  
Ultramafic Rocks ◽  
Granite Pluton ◽  
Silicate Minerals ◽  
Elevated Content ◽  
Unstable Phase ◽  
Metamorphic Fluids ◽  
Oxide Minerals

Studies that track and compiled transformations of ilmenite and magnetite under conditions of different metamorphic grades are still very limited. The Sedova Zaimka intrusion in Western Siberia (Russia) is a good example to examine the effect of contact metamorphism from greenschist to low-amphibolite facies on magmatic Fe-Ti oxide minerals, as this small mafic-ultramafic body is located within contact metamorphic aureole of a large granite pluton. In the Sedova Zaimka, ilmenite with little to no magnetite is present as an accessory dissemination throughout metamorphosed rocks. Ilmenite is variably enriched in MnO (1 to 13.3 wt%) and depleted in MgO (less than 0.3 wt%), suggesting that its primary magmatic composition has been unevenly modified by diffusion re-equilibrium with coexisting metamorphic silicates. The elevated content of ZnO (up to 0.5 wt%) and NiO (up to 0.4 wt%) in ilmenite suggests that both ZnO and NiO, like MnO, must be strongly partitioned into ilmenite relatively to silicate minerals under the reducing contact metamorphic conditions, if chromite is absent. The textural observations of ilmenite–sulfide and ilmenite–titanite–sulfide relationships indicate that Ti-magnetite, in contrast to ilmenite, is an unstable phase in the presence of sulfur-rich reduced metamorphic fluids and is completely replaced by sulfides, with the development of specific “octahedral meshes” of ilmenite in sulfides.

scholarly journals Chemical Composition of the Kojaku Granite Pluton, Southwestern Japan

2020 ◽  
Author(s):  
Toshihiro Fukuhara ◽  
Motohiro Tsuboi
Keyword(s):  
Chemical Composition ◽  
Granite Pluton

scholarly journals Volcanism and geochemistry of soil and vegetation cover of Kamchatka. Communication 2. Specificity of forming the elemental composition of volcanic soil in cold and humid conditions

2019 ◽  
pp. 25-33
Author(s):  
L. V. Zakharikhina ◽  
Yu. S. Litvinenko
Keyword(s):  
Chemical Composition ◽  
Elemental Composition ◽  
Vegetation Cover ◽  
Chemical Elements ◽  
Volcanic Rocks ◽  
Volcanic Soils ◽  
Volcanic Soil ◽  
Basic Composition ◽  
The Past ◽  
Acid Volcanics

Volcanic soils of Kamchatka have the low contents of most the chemical elements in relation to their overall prevalence in the soils of continents and volcanic soils of Europe. Relatively increased gross contents of elements typical for volcanic rocks of medium and basic composition: Na, Ca, Mg, Cd, Mn, Co, Cu, and steadily low contents of elements characteristic of acid volcanics: La, Ce, Pr, Nd, Nb, Hf, Tl, Rb and Th, is most characteristic of the soils of different areas of the peninsula. The existing in the past and currently observed different conditions of volcanism in the previously allocated soil areas of Kamchatka determine the diversity of the chemical composition of the soils in these territories.

scholarly journals U-Pb isotopic age of Zircon from hybrid rocks of the Korosten anorthosite-rapakivi-granite pluton

2016 ◽  
Vol 74 ◽  
pp. 6-10
Author(s):  
O. Bilan ◽  
◽  
O. Mytrokhyn ◽  
L. Shumlyanskyy ◽  
V. Zagorodniy ◽  
...  
Keyword(s):  
Rapakivi Granite ◽  
Isotopic Age ◽  
Granite Pluton

Mineralogical evolution of fayalite-bearing rapakivi granites from the Prins Christians Sund pluton, South Greenland

1990 ◽  
Vol 54 (374) ◽  
pp. 57-66 ◽  
Author(s):  
T. N. Harrison ◽  
I. Parsons ◽  
P. E. Brown
Keyword(s):  
Electron Microprobe ◽  
Low Pressure ◽  
Parent Magma ◽  
Rapakivi Granite ◽  
Granite Pluton ◽  
Early Proterozoic ◽  
Reducing Conditions ◽  
Inverted Pigeonite

AbstractThe Prins Christians Sund rapakivi granite pluton in South Greenland is a member of the early Proterozoic ‘Rapakivi Suite’ and is emplaced into early Proterozoic Ketilidian migmatites. The pluton is composed predominantly of black or dark brown monzonites and quartz monzonites (collectively, rapakivi granites), although a localised white facies is developed adjacent to metasedimentary xenoliths. The back rapakivi granites are extremely fresh and have an anhydrous primary mafic mineralogy of olivine and orthopyroxene, with rare inverted pigeonite and clinopyroxene; minor amounts of biotite and amphibole occur in most fayalite-bearing rapakivi granites. Feldspars in these rocks are black and non-turbid. The white rapakivi granites have a wholly hydrous mafic silicate assemblage and turbid, white or cream-coloured feldspars. Electron microprobe analyses of the mafic silicates in the black rapakivi granites show that they are Fe-rich, comprising fayalite (Fa93−96.5), orthopyroxene (Fs77−81), ferro-pargasitic and ferro-edenitic hornblende (Fe/(Fe + Mg) = 0.72−0.93), and biotite (Fe/(Fe + Mg) = 0.77−0.88). Both biotite and amphibole crystallised subsolidus, and often adopt symplectic morphologies. Biotite has formed in response to a fayalite-consuming reaction at temperatures below 650–700°C and fO2, of 10−16.5 to 10−17.5 bars, and continued to grow under reducing conditions below the QFM buffer to temperatures below 450–500°C. Orthopyroxene formed in response to a low-pressure fayalite-consuming reaction in the melt. The correlation of black, pristine feldspar with anhydrous mafic silicates, and of turbid feldspar with hydrous phases suggests either that the feldspars reflect the anhydrous nature of the parent magma, or more likely that the mafic mineralogy of the white rapakivi granites is secondary.

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