Results 11 to 20 of about 81 (73)
Journal of Metamorphic Geology, Volume 41, Issue 7, Page 997-1030, September 2023., 2023 Abstract The Dom Feliciano Belt of southern Brazil and Uruguay represents part of a larger Neoproterozoic orogenic system formed during the amalgamation of Western Gondwana. The hinterland and foreland domains in parts of the belt preserve deformation structures and metamorphic assemblages that developed during early crustal thickening from c.
Jack James Percival +4 more
wiley +1 more source
Characteristics of the Proterozoic porphyry-type Cu occurrence at Tienpää, Halsua, western Finland [PDF]
Bulletin of the Geological Society of Finland, 1984 The widespread, subeconomic porphyry-type Cu mineralization at Tienpää occurs in a Proterozoic tonalite complex. It is located in the marginal zone of the large granitoid complex of central Finland.
M. Nironen, J. Csongrádi
doaj +1 more source
Earth Surface Processes and Landforms, Volume 48, Issue 10, Page 2039-2056, August 2023., 2023 We address the relationship between the bedrock structure and bedrock surface topography through conducting structural analysis of the bedrock within the main recharge area of the Kurikka aquifer. Based on the presented results, it is evident that the initial bedrock‐digital elevation model (DEM) with smooth elevation transitions from the elevated ...
Eemi Ruuska +3 more
wiley +1 more source
The 1.88 Ga old Mäntylä Complex, central Finland: emplacement and deformation of mafic to felsic plutonic rocks and associated Mo mineralization [PDF]
Bulletin of the Geological Society of Finland, 1992 The Mäntylä complex is part of the extensive Central Finland Granitoid Complex. The intrusive sequence was established from contact relations as well as from structural and petrographic criteria.
M. Nironen, K. Front
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Meteoritics &Planetary Science, Volume 58, Issue 7, Page 1002-1017, July 2023., 2023 Abstract The Summanen structure is located in Central Finland and is one of Finland's 12 known meteorite impact structures. In 2017, the discovery of Summanen was based on numerous shatter cone boulders with planar deformation features (PDFs) and a circular electromagnetic anomaly, which is 2.6 km in diameter.
Satu Hietala +5 more
wiley +1 more source
General geology, alteration, and iron deposits in the Palaeoproterozoic Misi region, northern Finland [PDF]
Bulletin of the Geological Society of Finland, 2003 The Paleoproterozoic Misi region forms the northeastern part of the Peräpohja Schist Belt in northern Finland. The area comprises mafic volcanic land sedimentary rocks, differentiated gabbros, and late-orogenic granitoids.
T. Niiranen, E. Hanski, P. Eilu
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Geochemistry, Geophysics, Geosystems, Volume 24, Issue 5, May 2023., 2023 Abstract Recent studies have shown that biosignatures of ancient microbial life exist in mineral coatings in deep bedrock fractures of Precambrian cratons, but such surveys have been few and far between. Here, we report results from southwestern Sweden in an area of 1.6–1.5 Ga Paleoproterozoic rocks heavily reworked by the 1.14–0.96 Ga Sveconorwegian ...
Henrik Drake +4 more
wiley +1 more source
The Orivesi granite batholith, Southern Central Finland - characteristics and emplacement [PDF]
Bulletin of the Geological Society of Finland, 1996 The Orivesi granite batholith is situated in an E-W trending belt of granite intrusions along the southern margin of the Central Finland Granitoid Complex (CFGC).
O. Selonen, C. Ehlers
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Petrographic studies and mineralogical characterization of the Dellen impactites
Meteoritics &Planetary Science, Volume 58, Issue 4, Page 480-500, April 2023., 2023 Abstract The impact origin of the Early Cretaceous (140.82 ± 0.51 Ma) 20‐km diameter Dellen structure was proven in the late 60s based on the discovery of planar deformation features (PDFs) in quartz grains. Although decades have passed, impactites found from the crater have not received much attention. Thus, this study provides a detailed petrological
Satu Hietala +2 more
wiley +1 more source
Journal of Geophysical Research: Solid Earth, Volume 128, Issue 3, March 2023., 2023 Abstract Geophysical logs collected from a deep borehole drilled into the North American Craton in Northeastern Alberta shed valuable light on the state of stress in stable cratons. Observed breakout (BO) azimuths rotate between three depth intervals, ranging from 100° at 1,650–2,000 m to 173° at 2,000–2,210 m, and finally to 145° at the bottom.
Wenjing Wang +2 more
wiley +1 more source