Results 21 to 30 of about 1,291 (133)

Detrital zircon geochronology of Paleoproterozoic metasedimentary rocks from Jämsä, Central Finland [PDF]

Bulletin of the Geological Society of Finland
In this short communication, we present new detrital single grain zircon U-Pb data for six metasedimentary rock samples from Jämsä, Central Finland.
Perttu Mikkola, Matti Kurhila, Hannu Huhma   +2 more
doaj   +1 more source

CARBONATES OF ORE DEPOSITS OF PRECAMBRIAN OF THE CENTRAL PART OF THE UKRAINIAN SHIELD

Геохімія техногенезу, 2020
The article presents the results of study of the isotopic composition of oxygen and carbon of carbonates in ore deposits of the Early Pre-cambrian of the Ukrainian Shield. The following objects were studied: 1. Iron ore formations of the Kryvyi Rih ultra-
Fomin Yu., Demikhov Yu., Verkhovtsev V., Borisova N., Chuprinova S.   +4 more
doaj   +1 more source

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

Petrogenesis and tectonic significance of the Mengjiaping beschtauite in the southern Taihang mountains

Open Geosciences, 2021
The evolution process of the North China Craton has been discussed by many scholars; however, the frame for the timing of the Trans-North China Block has not been fully agreed upon.
Tian Haofei, Li Ganyu, Choi Jinyong, Luan Wenlou, Cui Xingtao, Wang Shen, Jin Mengqi, Chen Haotian, Chen Wenjing, Liang Xian, Zou Chengjie, Zhao Liang, Han Sinan, Zou Peijie, Hu Xiaofei   +14 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

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

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
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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

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

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