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Raahe ladoga shear complex

  • FIRE 3A Tectonic overview FIN-EPOS University of Helsinki

    Nov 13, 2020· Further west, the actual deep transition from Archean to Proterozoic domain is approximately marked by the dominantly metasedimentary rocks of the Savo belt (e.g., Mikkola et al., 2016) that coincides with the crustal scale NWSE Raahe-Ladoga shear zone (Sorjonen-Ward, 2006; Lahtinen et al., 2016).

  • Zircon and monazite geochronology of deformation in the

    The RaaheLadoga Shear Complex is a major crustal structure representing the ArchaeanPalaeoproterozoic boundary in the Fennoscandian Shield. The complex developed during the Svecofennian Orogeny (

  • Geophysica 52:2 Tiedekirja

    Part 2: From an Obligation of the Lerned Elite to Citizen Science; Mohamed Abdel Zaher, Markku Pirttijärvi and Toivo Korja, Geophysical Studies of the Raahe-Ladoga Shear Complex in

  • Constraints over the age of magmatism and subsequent

    = Bothnia-Senja shear system, MOL = Malangen-Onega Lineament, PC = Pudasjärvi Complex, PSZ = Pajala Shear Zone, RLZ = Raahe-Ladoga Zone (modified after Bergh et al. 2014). b) Geology of the study area with reference to geochronology work conducted in

  • Geophysical Studies of the Raahe-Ladoga Shear Complex in

    the Raahe-Ladoga Shear Complex, provided by the Geological Survey of Finland, were processed and interpreted in combination with the regional gravity data of the Finnish Geodetic Institute and the Geo-logical Survey of Finland. Filtering techniques such as the first vertical derivative, horizontal and tilt

  • 3D-VALOKUVIEN HYÖDYNTÄMINEN PYHÄSALMEN

    luoteeseen suuntautuva RaaheLaatokka-siirrosvyöhyke (RLZ, Raahe-Ladoga Zone), sekä koilliseen suuntautuva Oulujärven hiertovyöhyke (OSZ, Oulujärvi Shear Zone) (Kuva 1) (Puustjärvi 1999). Pyhäsalmen malmio on osa VihantiPyhäsalmi-malmivyöhykettä, johon

  • Helsingin yliopisto - Seismologian laitos

    Structure of the Raahe Ladoga Shear Complex 15:30 - 16:00 J. Salminen, S. Mertanen, D. Evans, and Z. Wang Paleomagnetic and geochemical studies of the Subjotnian Satakunta diabase dykes implications to Mesoproterozoic supercontinent Nuna 16:00 - 16:30 R. Alviola Distribution of rare element pegmatites in Finland

  • The Vihanti-Pyhäsalmi Area SpringerLink

    Jul 25, 2015· Structure of the Raahe - Ladoga Shear Complex. In: Lithosphere 2012 : Seventh Symposium on the Structure, Composition and Evolution of the Lithosphere in Finland, Espoo, November 6-8, 2012 : programme and extended abstracts.

  • Zircon and monazite geochronology of deformation in the

    The RaaheLadoga Shear Complex is a major crustal structure representing the ArchaeanPalaeoproterozoic boundary in the Fennoscandian Shield. The complex developed during the Svecofennian Orogeny ( c. 1.9 1.8 Ga) beginning with regional thrust tectonic phases D1 and D2, followed by large-scale shearing events D3 and D4. The Pielavesi Shear Zone is a vertical

  • Geophysical Studies of the Raahe-Ladoga Shear Complex in

    2017 (English) In: Geophysica, ISSN 0367-4231, E-ISSN 2324-0741, Vol. 52, no 2, p. 43-67 Article in journal (Refereed) Published Abstract [en] We have studied geophysical properties of the Raahe-Ladoga Shear Complex, a major NW-SE trending strike-slip shear zone in Central Finland.

  • SIMS geochronology of a 1.93 Ga basement metagranitoid at

    gen, but are found in the Savo schist belt within the Raahe-Ladoga zone in Finland, and in the Rombak-Sjangeli basement window of the Caledonides, all along the Archean-Paleoproterozoic boundary. In addition, 1.961.94 Ga calc-alkaline rocks with island arc affinity occur in the northern part of the Bothnian basin, south of the Skellefte

  • Mohsin Tahir - Helsinki Area, Finland Professional

    The Vihanti-Lampinsaari group in the Raahe-Ladoga belt, central Finland, hosts massive sulphide deposits. Host rocks are highly deformed and metamorphosed (amphibolite to granulite facies) felsic to intermediate volcanic rocks with minor mafic metavolcanics.

  • LAKE LADOGA SURFACE FEATURES ON THE ERS-1 SAR IMAGERY

    Contact measurements carried out in Lake Ladoga during the LADEX-80 experiment shown that generation of high frequency IW in the lake resulted from shear unstability of subsurface currents associated with strong current gradients [16]. Periodic current strengthens and reductions result from large-scale wind stress variations.

  • raahe ladoga shear complex

    Raahe Ladoga Shear Complex RLSC is a 100 km wide NW - SE striking set of strongly sheared rocks and intervening crustal blocks in which antecedent structures are preserved These were formed by longterm and multiphase - Svecofennian convergent tectonic evolution and consist of supracrustal paragneisses and intrusive rocks The latter are

  • ILP - Finnish Lithosphere Meeting - Helsingin yliopisto

    Structure of the Raahe Ladoga Shear Complex E. Lanne. Coda waves of local earthquakes: A case history from northern Finland 59 E. Lehtonen, T. Halkoaho, P. Hölttä, H. Huhma, E. Luukkonen, E. Heilimo 63 and A. Käpyaho. Constraining the age and evolution of Archean greenstone belts

  • Timing of orogenic gold in the Svecofennian domain

    Orogenic gold provinces in the Svecofennian domain occur in three arc complexes: in the 1.93-1.87 Ga primitive arc complex along the collision zone (e.g. Savo belt in the Raahe-Ladoga zone) between the Svecofennian and Karealian domains (Laivakangas province), in the 1.90-1.87 Ga Central Svecofennian accretionary arc complex (Seinäjoki, Tampere and Pirkkala provinces) and in the

  • Science Blog: New constraints to the development of the

    Nov 06, 2018· Science Blog: New constraints to the development of the Svecofennian orogeny. Teksti: Perttu Mikkola, Geologist. The bedrock of Central Finland has a research history extending well back into the 19 th century, and the overall evolution of the area is thus relatively well understood. Nevertheless, new data from previously poorly studied areas or the revisiting of areas studied decades ago

  • The Vihanti-Pyhäsalmi VMS Belt - ScienceDirect

    Jan 01, 2015· The volcano-sedimentary host rocks belong to a 1.931.92 Ga island arc that occurs along the northwestern parts of the Raahe-Ladoga shear complex. The stratigraphy in the region is divided into two units, a lower bimodal volcanic unit conforming to the Pyhäsalmi group and an upper volcano-sedimentary association defined as the Vihanti group.

  • Structural development and petrofabrics of eclogite facies

    These shear zones deformed under eclogite facies conditions at an estimated temperature of 670 f 50°C and a minimum pressure of 1460 MPa, which corresponds to depths of >55 km in the continental crust. Detailed investigation of the major shear zones shows the development of a strong foliation defined by the shape preferred orientation of

  • Geology, alteration and lithogeochemistry of the

    Feb 07, 2020· General geology of the southeastern part of the Raahe-Ladoga Shear zone (RLSZ). a The Jäppilä-Virtasalmi block in Eastern Finland belongs to the older Svecofennian 1.931.91 Ga magmatic rocks and is comparable with the Vihanti-Pyhäsalmi belt.b The study area is located within the southeastern corner of the Jäppilä-Virtasalmi block in the Viholanniemi suite.

  • Geophysica 52:2 Bookstore Tiedekirja

    Part 2: From an Obligation of the Lerned Elite to Citizen Science; Mohamed Abdel Zaher, Markku Pirttijärvi and Toivo Korja, Geophysical Studies of the Raahe-Ladoga Shear Complex in

  • Precambrian Research, 64 (1993) 207-223

    are the Pajala Shear Zone in northern Sweden and the Russian North Karelia Shear Zone in the east. Stage D4 created a conjugate shear system called the Finlandia Shear System, the type example of which is the Oulujarvi Shear Zone. This is a NE-SW trending sinistral strike-slip shear zone more than 250 km long and 20-30 km wide across

  • Geology, alteration and lithogeochemistry of the

    Feb 07, 2020· General geology of the southeastern part of the Raahe-Ladoga Shear zone (RLSZ). a The Jäppilä-Virtasalmi block in Eastern Finland belongs to the older Svecofennian 1.931.91 Ga magmatic rocks and is comparable with the Vihanti-Pyhäsalmi belt. b The study area is located within the southeastern corner of the Jäppilä-Virtasalmi block in the Viholanniemi suite. c The Jäppilä-Virtasalmi block

  • FIRE 1 Tectonic overview FIN-EPOS University of Helsinki

    Dec 15, 2020· The FIRE 1 profile crosses three tectonic regions: the Archean nucleus in the east, the ArcheanProterozoic transition zone, and the Paleoproterozoic (Svecofennian) rocks of the Savo belt and Central Finland granitoid complex (Korja et al., 2006).

  • SKARNOID ROCKS IN THE WESTERN PART OF PITKÄRANTA

    This shear zone is called Raahe-Ladoga zone (Korsman et al. 1988). The Raahe-Ladoga zone has been known as a main tectonic and ore bearing structure (Kahma 1973, 1978). The transition from predominantly Archean rocks in the northeast to a Proterozoic domain in the southwest occurs over a

  • Seismic reflection profiling for massive sulfide

    the Raahe-Ladoga belt containing 90% of the known sulfide deposits of Finland. In each of the study sites a network of seismic reflection profiles was acquired during the HIRE (HIgh REsolution reflection seismics for ore exploration 2007-2010) project by the Geological Survey of Finland. The multiphase deformation history of the study

  • Analog modeling of one-way gravitational spreading of hot

    Oct 01, 2015· Legend: KyDZ Kyyjärvi deformation zone; RLSC Raahe-Ladoga shear complex. In this paper, we will test the structural and mechanical inheritance of terrane boundaries and strike-slip faults in orogen-perpendicular one-way gravitational spreading by analog centrifuge models.

  • DataCite Search

    The RaaheLadoga Shear Complex is a major crustal structure representing the ArchaeanPalaeoproterozoic boundary in the Fennoscandian Shield. The complex developed during the Svecofennian Orogeny (c. 1.9 1.8 Ga) beginning with regional thrust tectonic phases D1 and D2, followed by large-scale shearing events D3 and D4.

  • Laiva Gold Project - Mining Technology Mining News and

    The mine lies within the north-western section of the Raahe-Ladoga suture zone that extends up to 450km in length. Structurally, the deposit is complex with various types of intrusive rocks cross cutting the metamorphosed and folded sedimentary rocks and volcanic schist belts.

  • A Review of Gold Mineralization Styles in Finland

    Nov 01, 2003· For intrusion-related (nonskarn) mineralization, the most promising areas are close to the Raahe-Ladoga Suture, and the potential for additional metamorphosed and deformed epithermal mineralization exists in the Tampere schist belt. The significant number of gold occurrences already known in these areas highlights the potential for new discoveries.

  • Zircon and monazite geochronology of deformation in the

    Mar 01, 2017· The RaaheLadoga Shear Complex is a major crustal structure representing the ArchaeanPalaeoproterozoic boundary in the Fennoscandian Shield. The complex developed during the Svecofennian Orogeny ( c. 1.9 1.8 Ga) beginning with regional thrust tectonic phases D1 and D2, followed by large-scale shearing events D3 and D4. The Pielavesi Shear Zone is a vertical

  • Fact Sheet for Deposit Area 1805 - 041 - NGU

    (3) Orogenic gold deposits with Au-As enrichments along shear-zones. (4) Late orogenic Cu-Au quartz veins. The Gautelisfjell area is characterised by an older complex of tonalitic rocks (1940 Ma, Romer 1992) that have been eroded and is overlain by a conglomerate, and after that by pelite-greywacke rocks.

  • Geophysical Studies of the Raahe-Ladoga Shear Complex in

    Request PDF Geophysical Studies of the Raahe-Ladoga Shear Complex in the Iisalmi Area of Finland We have studied geophysical properties of the Raahe-Ladoga Shear Complex, a major NW-SE

  • OPERATIONS Otso Gold Corp

    The Otso gold deposit is in the 450 km long Savo Belt, immediately adjacent to the Raahe-Ladoga suture. The Savo Belt comprises supracrustal mafic-ultramafic volcanic and volcano sedimentary rocks, and accretionary prism nappe complexes, which have been intruded by mafic plutons and several generations of granitoid stocks and dykes.

  • Timing and geochemistry of potassic magmatism in the

    from the Raahe-Ladoga zone about 15 km north of Puutsaari. Svecofennian supracrustal rocks in the NW Ladoga Lake area comprise a metasedimentary assemblage of schists, gneisses and calc-silicate rocks. The Svecofennian formations in the region are divided into two major blocks or terranes separated by the NW trending Priozersk shear zone.

  • (EARLY) PRECAMBRIAN CONVECTION CELL IN THE

    2.2 RaaheLadoga tectonic belt The RaaheLadoga tectonic belt (Fig. 4) is composed of major NW-trending dextral wrench faults, the Main Sulfide Ore Belt, a negative gravity anomaly, and a deep-seated fracture system; its Svecokarelian (2.5-1.75 Ga) origin is suggested by the Svecofennian

  • Tonalite-hosted early Proterozoic gold deposit at

    The Osikonmäki gold deposit is hosted by an early Proterozoic tonalite close to the Archean-Proterozoic boundary along the Raahe-Ladoga suture zone. The DOAJ is a community-curated online directory that indexes and provides access to high quality, open access, peer-reviewed journals.

  • Geophysical Studies of the Raahe-Ladoga Shear Complex in

    We have studied geophysical properties of the Raahe-Ladoga Shear Complex, a major NW-SE trending strike-slip shear zone in Central Finland. Aeromagnetic and airborne electromagnetic data from the Raahe-Ladoga Shear Complex, provided by the Geological Survey of Finland, were processed and interpreted in combination with the regional gravity data

  • (PDF) Timing and geochemistry of potassic magmatism in the

    In the NW Ladoga Lake region the southwestern margin of the Raahe-Ladoga zone is defined by the Meijeri thrust (Baltibayev et al., 1996) separating the Svecofennian formations from the Raahe-Ladoga zone about 15 km north of Puutsaari.Svecofennian supracrustal rocks in the NW Ladoga Lake area comprise a metasedimentary assemblage of schists

  • Geophysical Studies of the Raahe-Ladoga Shear Complex in

    Corpus ID: 52231779. Geophysical Studies of the Raahe-Ladoga Shear Complex in the Iisalmi Area of Finland @inproceedings{Zaher2017GeophysicalSO, title={Geophysical Studies of the Raahe-Ladoga Shear Complex in the Iisalmi Area of Finland}, author={M. Zaher and M. Pirttij{\"a}rvi and T.

  • 10 GEOLOGI 69 (2017) - Geologinen Seura

    the RaaheLadoga shear complex. In the Cent-ral Finland granitoid complex the deformation took place around 1.881.86 Ga, which can indicate that also the Eastern part of the orogen suffered coeval deformation (Nikkilä et al. 2016, Nikkilä 2016). Analog modeling seems a practical tool also in modeling tectonic evolution of an ancient orogen.

  • Science Blog: New constraints to the development of the

    Nov 06, 2018· Science Blog: New constraints to the development of the Svecofennian orogeny. Text: Perttu Mikkola, Geologist. The bedrock of Central Finland has a research history extending well back into the 19 th century, and the overall evolution of the area is thus relatively well understood. Nevertheless, new data from previously poorly studied areas or the revisiting of areas studied decades ago bring