Petrology
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The Composition and Age of the Mesoarchean Gabbro in the South Vygozersky and Kamennoozersky Greenstone Structures, Karelia
Petrology - Tập 26 - Trang 29-46 - 2018
The geochemical and zircon geochronological (U-Pb, SHRIMP-II) study of Mesoarchean gabbros of the South Vygozersky and Kamennoozersky greenstone structures of Central Karelia made it possible to distinguish four gabbro types: (1) Fe–Ti gabbro, 2869 ± 12 Ma, (2) gabbro compositionally close to tholeiitic basalts, 2857 ± 7 Ma, (3) leucogbabbro, 2840 ± 5 Ma; and (4) melanogabbro, 2818 ± 14 Ma. From t...... hiện toàn bộ
Contact interaction of agpaitic magmas with basement gneisses: An example of the Khibina and Lovozero Massifs
Petrology - Tập 19 - Trang 109-133 - 2011
Data on processes that occurred at contacts of large agpaitic syenite intrusions and basement gneisses obtained by the authors by studying and sampling profiles across the contacts and involve the composition of minerals, analysis of mineral assemblages, isotopic dating of the processes, and analysis of the behavior of major, volatile, and trace elements in rocks near the contact. The contact zone...... hiện toàn bộ
Dehydrogenation as the mechanism of formation of the oriented spinel-pyroxene symplectites and magnetite-hematite inclusions in terrestrial and extraterrestrial olivines
Petrology - Tập 23 - Trang 176-188 - 2015
A new approach is developed to explain the nature of oriented pyroxene-spinel symplectites and magnetite-hematite inclusions in olivines. Symplectites are considered the products of dehydrogenation and solid-state substitution of OH-bearing olivine-like precursor phases occured as lamellar inclusions in olivine. According to the dehydrogenation model, the precursor of the oriented symplectic pyrox...... hiện toàn bộ
Neoproterozoic magmatic complexes of the Songino block (Mongolia): A problem of formation and correlation of Precambrian terranes in the Central-Asian Orogenic Belt
Petrology - Tập 25 - Trang 365-395 - 2017
An important role of the early Neoproterozoic juvenile crustal growth in the formation of the Khangai group of Precambrian terranes in the Central Asian Orogenic Belt was demonstrated by the example of the Holbo Nur Zone of the Songin Block. Magmatic complexes of this zone correspond to different settings of the Early Neoproterozoic ocean: oceanic islands, mid-ocean ridges, intraoceanic island arc...... hiện toàn bộ
Variations in the Composition of MORB Chilled Glasses from the Mid-Atlantic Ridge, 12°–31° N: Reflection of Compositional Evolution of Parental Melts and the Influence of a Hydrothermal Component
Petrology - Tập 31 - Trang 475-491 - 2023
The geochemical peculiarities of sample collection of MORB chilled glasses obtained in six areas of the axial zone of the Mid-Atlantic Ridge (MAR), 12°–31° N have been studied. The results of this study provided information on the composition of the parental melts for these glasses and made it possible to assess the probable geochemical effects reflecting the interaction of magmatic melts with hyd...... hiện toàn bộ
Kimberlites and lamproites of the East European Platform: Petrology and geochemistry
Petrology - Tập 15 - Trang 315-334 - 2007
Several episodes of kimberlite magmatism occurred in the East European Province (EEP) during a long (about 1.5 Gyr) time period, from the Late Paleoproterozoic (ca. 1.8 Ga) in the Archean Ukrainian and Baltic shields to the Middle Paleozoic (ca. 0.36 Ga) mainly in the Arkhangelsk, Timan, and adjacent regions. Based on the analysis of data on 16 kimberlite occurrences and four lamproite occurrences...... hiện toàn bộ
Initiation of transform faults at rifted continental margins: 3D petrological-thermomechanical modeling and comparison to the Woodlark Basin
Petrology - Tập 21 - Trang 550-560 - 2013
This work presents high-resolution 3D numerical model of transform fault initiation at rifted continental margins. Our petrological-thermomechanical visco-plastic model allows for spontaneous nucleation of oceanic spreading process in a continental rift zone and takes into account new oceanic crust growth driven by decompression melting of the asthenospheric mantle. Numerical model predicts that r...... hiện toàn bộ
Magmatic sources and geodynamics of the early Mesozoic Northern Mongolia-Western Transbaikalia rift zone
Petrology - Tập 15 - Trang 35-57 - 2007
The Northern Mongolia-Western Transbaikalia rift zone is the largest Mesozoic riftogenic structure in eastern Asia and extends for a distance of more than 1200 km. The zone consists of depressions and grabens, which were formed between 233 and 188 Ma and are filled with basaltic and basalt-comendite (bimodal) volcanic associations accompanied by numerous peralkaline granite massifs. Geochemical an...... hiện toàn bộ
Synkinematic granitoid magmatism of Western Sangilen, South-East Tuva
Petrology - Tập 25 - Trang 87-113 - 2017
The problems of tectonic control of composition, size, and morphology of synkinematic crustal granitoids are discussed by the example of the Western Sangilen granites (South-East Tuva). Comparative analysis was performed for felsic bodies and massifs spatially confined to tectonic zone (Erzin shear zone): Erzin migmatite–granite complex (510–490 Ma), Matut granitoid massif (510–490 Ma), Bayankol p...... hiện toàn bộ
Neoproterozic anorogenic rhyolite-granite volcanoplutonic association of the Aktau-Mointy sialic massif (Central Kazakhstan): Age, source, and paleotectonic position
Petrology - Tập 23 - Trang 22-44 - 2015
Rhyolite-granite volcanoplutonic association was identified among the Precambrian basement complexes of the Aktau-Mointy Massif, Central Kazakhstan. This association comprises rhyodacites, rhyolites, subalkaline rhyolites, tuffs, and felsic volcanogenic-sedimentary rocks of the Altyn Syngan and Urkendeu formations, as well as granitoids of the Uzunzhal Complex. U-Pb (ID-TIMS) dating of accessory z...... hiện toàn bộ
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