Results 21 to 30 of about 6,981 (220)

Geochronology of the felsic rocks in Orijärvi, southern Finland – implications for stratigraphy [PDF]

Estonian Journal of Earth Sciences
The Orijärvi area within the Paleoproterozoic Uusimaa belt contains volcanic and minor sedimentary formations, providing valuable insights into the oldest Svecofennian crust in southern Finland.
Elisa Toivanen, Teemu Vehkamäki, Markku Väisänen, Jaakko Kara, Hugh O’Brien   +4 more
doaj   +1 more source

Geology, geochronology and geochemistry of the 2.05 Ga gneissic A1-type granites and related intermediate rocks in central Finland: implication for the tectonic evolution of the Karelia craton margin [PDF]

Bulletin of the Geological Society of Finland, 2019
The 2.05 Ga Otanmäki suite represents a globally rare occurrence of Paleoproterozoic non-orogenic A1-type magmatism. It consists of a broad variety of A-type felsic and intermediate igneous rocks including monzodiorites, monzonites, syenites and peral ...
Kimmo Kärenlampi, Asko Kontinen, Hannu Huhma, Eero Hanski   +3 more
doaj   +1 more source

The stable isotope (C, O, S) record of Paleoproterozoic marbles, Scotland [PDF]

, 2023
Paleoproterozoic marbles occur widely in NW Scotland. The isotopically heavy carbonate carbon (⁠δ 13C >3‰) in marbles that characterizes the worldwide Lomagundi–Jatuli Event (2.3–2.05 Ga) is recognized in the Laurentian Foreland, the Moine Nappe and ...
Adrian J. Boyce, Parnell, John, Schito, Andrea, Joseph G. T. Armstrong, Armstrong, Joseph G.T., Andrea Schito, Boyce, Adrian J., David Muirhead, John Parnell, Muirhead, David, Armstrong, Joseph G. T.   +10 more
core   +1 more source

Age and origin of the Nb-Zr-REE mineralization in the Paleoproterozoic A1-type granitoids at Otanmäki, central Finland [PDF]

Bulletin of the Geological Society of Finland, 2020
The Otanmäki area in central Finland hosts two occurrences of Nb-Zr-REE minerali-zation, Katajakangas and Kontioaho, within a suite of ca. 2.04–2.06 Ga (A1-type) gneissic granites, syenite and monzonite-monzodiorite.
Kimmo Kärenlampi, Asko Kontinen, Eero Hanski, Hannu Huhma, Yann Lahaye, Joachim Krause, Thomas Heinig   +6 more
doaj   +1 more source

New U-Pb zircon data for Maarianvaara granite and Tohmajärvi volcanic complex, eastern Finland: geologic implications [PDF]

Bulletin of the Geological Society of Finland
New U-Pb zircon ages reported for samples from the Maarianvaara granite and Tohmajärvi volcanic complex (TVC) corroborate previous estimates of their magmatic emplacement at ca. 1.85 Ga and 2.11 Ga, respectively. The ca.
Asko Kontinen, Jarmo Kohonen, Perttu Mikkola, Matti Kurhila   +3 more
doaj   +1 more source

1.88 Ga granitoids at Sorsakoski, Central Finland: A-type magmatism within the Raahe-Ladoga suture zone [PDF]

Bulletin of the Geological Society of Finland
Four quartz monzonite – granite intrusions forming the Sorsakoski granite lithodeme, are found within the Raahe-Ladoga suture zone in Central Finland. The prevailing potassium feldspar megacrystic quartz monzonites and granites form a bimodal association
Perttu Mikkola, Maija Pietilä, O. Tapani Rämö, Hannu Huhma   +3 more
doaj   +1 more source

A tectonic model for the juxtaposition of granulite- and amphibolite-facies rocks in the Eburnean orogenic belt (Sassandra-Cavally domain, Côte d’Ivoire)

BSGF - Earth Sciences Bulletin, 2023
The Sassandra-Cavally (SASCA) domain (SW Côte d’Ivoire) marks the transition between the Archean Kenema-Man craton and the Paleoproterozoic (Rhyacian) Baoule-Mossi domain.
Koffi Augustin Yao, Baratoux Lenka, Pitra Pavel, Kouamelan Alain Nicaise, Vanderhaeghe Olivier, Thébaud Nicolas, Bruguier Olivier, Block Sylvain, Fossou Kouadio Hervé Jean-Luc, Kone Jacques   +9 more
doaj   +1 more source

Features of dike magmatism in the Northern frame of the Pechenga structure

Vestnik MGTU, 2019
A comprehensive study of Paleoproterozoic dike complexes within North-Western part of the Kola region has been carried out. The research allows establish stages of their formation, correlate with thickness of volcanites and reconstruct the geodynamic ...
Terekhov E. N. , Morozov Yu. A. , Smolkin V. F. , Bayanova T. B. , Serov P. A., Shcherbakova T. F. , Smulskaya A. I.   +6 more
doaj   +1 more source

Supplemental Material: Late Archean–Paleoproterozoic plate tectonics along the northern margin of the North China craton

, 2022
Table S1: U-Pb zircon geochronology results of late Archean Wuchuan ultramafic-mafic complex and Paleoproterozoic intrusions. Table S2: U-Pb baddeleyite geochronology results of Yongli carbonatite sample. Table S3: Whole-rock geochemistry data for the 21
Chen Wu (10099836), et al. (281964)
core   +1 more source

Geochemical signatures of manganese ores around Barbil, Noamundi-Koira basin, Singhbhum Craton, Eastern India

Geology, Ecology, and Landscapes, 2021
Palaeoproterozoic Noamundi – Koira Basin (NKB), on the western margin of the >3.0 Ga old Singhbhum Granitoid Complex, forms a horseshoe-shaped synclinorium.
Shabber H. Alvi, Mohd. Shaif
doaj   +1 more source