Results 11 to 20 of about 69 (53)

Some Debatable Issues About the Stratigraphy of Bug Area Granulite Complex [PDF]

Mineralogical Journal, 2019
L.M. STEPANYUK, O.V. HRINCHENKO
openaire   +3 more sources

PETROPARAGENESES AND POSSIBLE ORIGIN OF THE BUG AREA GRANULITE COMPLEX SUPERCRUSTAL FORMATIONS (WESTERN PART OF UKRAINIAN SHIELD). Article 3. The proposed initial composition and conditions for the formation of the complex [PDF]

Mineralogical Journal, 2019
V.P. Kyrylyuk, M.I. Bogdanova, E.I. Savina   +2 more
exaly   +5 more sources

Petroparageneses and Possible Origin of the Bug Area Granulite Complex Supercrustal Formations (Western Part of Ukrainian Shield). Article 2. Petroparageneses of the Supercrustal Formations and Typomorphic Features of Petrotypes [PDF]

Mineralogical Journal, 2019
V.P. KYRYLYUK, M.I. BOGDANOVA, E.I. SAVINA   +2 more
openaire   +3 more sources

Paleoarchean U–Pb (SIMS SHRIMP-II) Age of Mafic Granulites from the Bug Complex, Ukrainian Shield

Doklady Earth Sciences, 2019
Mafic granulites (metamorphosed tholeite-komatiite volcanic rocks) represent the inclusions in gneissenderbite of the Bug complex (southwest of the Ukrainian shield). The studied mafic inclusion has two zircon generations of magmatic origin that yield, respectively, SHRIMP zircon U–Pb ages of 3628±58 Ma and 2845±65 Ma.
S. B. Lobach-Zhuchenko, T. B. Kaulina, Yu. B. Marin, A. V. Yurchenko, S. G. Skublov, Yu. S. Egorova, O. L. Galankina, S. A. Sergeev   +7 more
openaire   +2 more sources

The Archean formation of the Sarmatian continental crust [PDF]

, 2017
Based on our new U–Pb isotope data (SHRIMP-II) for the Voronezh Crystalline Massif (VCM) and on published U–Pb data for the Archean rocks of the Ukrainian Shield (USh), we have substantiated the main stages of the Archean evolution of the Sarmatian crust,
S.B. Lobach-Zhuchenko, E.M. Bobrova, M.V. Ryborak, S.A. Sergeev, V.V. Sukach, S.G. Skublov, T.E. Saltykova, N.G. Berezhnaya, K.I. Lokhov, A.Yu. Al’bekov   +9 more
core   +1 more source

Revisiting stratigraphic complexes and regional stratigraphic scheme of the lower precambrian of the Ukrainian shield. Article 1. Grounds for the introduction of stratigraphic complexes in the scheme of the Ukrainian shield

Мінеральні ресурси України, 2019
The stratigraphic scheme of the Early Precambrian of the Ukrainian Shield bears a number of differences from the traditional regional stratigraphic schemes: 1) along with stratified subdivisions it includes intrusive and ultrametamorphic complexes that ...
V. P. Kyrylyuk
doaj   +1 more source

Subduction Initiation and Early Subduction Zone Development: Insights From the P–T–t Path of the Bay of Islands Metamorphic Sole

Journal of Metamorphic Geology, EarlyView.
ABSTRACT The processes involved during subduction initiation (SI) remain poorly constrained, in part due to the rarity of geological archives. Ophiolites and their underlying metamorphic soles are thought to form during subduction zone infancy and may thus provide critical constraints. Metamorphic soles are derived from oceanic crust of the lower plate
François Fournier‐Roy, Carl Guilmette, Mark Coleman, Kyle Larson, Douglas K. Tinkham, Alana M. Hinchey, John Wakabayashi, Jean H. Bédard, Louise Mérit, Philippe Agard, Loïc Labrousse, Antoine Godet   +11 more
wiley   +1 more source

Historical Corrals in Fennoscandia Reveal Divergent Legacies of Concentrated Reindeer Densities Between Continental and Suboceanic Tundra

Journal of Vegetation Science, Volume 37, Issue 4, July/August 2026.
Historical reindeer corrals in Fennoscandian tundra showed that the legacies of concentrated reindeer densities varied between geobotanical districts. While high graminoid abundance always persisted, suboceanic sites, but not continental sites, had higher forb and species richness per plot. This led to more distinct plant communities inside the corrals
Eero Myrsky, Outi H. Manninen, Sari Stark   +2 more
wiley   +1 more source

Protracted High‐Grade Metamorphism and Slow Cooling in the Adirondacks Recalibrate Neoproterozoic Global Paleogeography

Tectonics, Volume 45, Issue 6, June 2026.
Abstract The assembly and breakup of the supercontinent Rodinia set the stage for Earth system evolution through the Neoproterozoic Era. Laurentia, the central craton in Rodinia, lacks well‐dated paleomagnetic poles between ca. 990 Ma and 780 Ma. In this study, we develop new U‐Pb petrochronology and thermochronology data sets from zircon, garnet ...
Yiming Zhang, Eben Blake Hodgin, Mark D. Schmitz, Darin M. Schwartz, Michael T. Mohr, James L. Crowley, Nicholas L. Swanson‐Hysell   +6 more
wiley   +1 more source

Near‐Synchronous Cambrian Evolution of the Transbrasiliano‐Kandi‐4°50′ Shear Zone in South America and Africa

Terra Nova, Volume 38, Issue 2, Page 97-105, April 2026.
ABSTRACT The Transbrasiliano‐Kandi‐4°50′ (TK4) shear zone in western Gondwana crosscuts South America and NW Africa for at least 6000 km. Despite its impressive size, the timing of the main episode of dextral ductile shearing is uncertain. We present detailed in situ multi‐mineral geochronology of mylonites from both Brazil and Algeria supporting that ...
F. A. Caxito, B. V. Ribeiro, F. Alkmim, A. Deramchi, C. L. Kirkland   +4 more
wiley   +1 more source