Results 31 to 40 of about 322 (183)

Supracrustal rocks in the Kuovila area, Southern Finland: Structural evolution, geochemical characteristics and the age of volcanism [PDF]

Bulletin of the Geological Society of Finland, 2005
The supracrustal rocks of the Kuovila area in the Palaeoproterozoic Svecofennian Uusimaa Belt, southern Finland, consist mainly of volcaniclastic rocks associated with banded iron formations (BIFs) and marbles.
P. Skyttä, A. Käpyaho, I. Mänttäri
doaj   +1 more source

Geochemical evolution of Dalradian metavolcanic rocks: implications for the break-up of the Rodinia supercontinent [PDF]

Journal of the Geological Society, 2011
Abstract: Neoproterozoic basaltic magmatism in the Dalradian Supergroup of Scotland and Ireland was associated with the break-up of the Rodinia supercontinent. Magmas were erupted in rift-related basins along a strike length of at least 700 km and during a time period of c . 80 Ma.
Fettes, D.J., Macdonald, R., Fitton, J.G., Stephenson, D., Cooper, M.R.   +4 more
openaire   +2 more sources

Rb/Sr whole rock age determinations on metavolcanic rocks from the Narssarssuaq region, South Greenland

Rapport Grønlands Geologiske Undersøgelse, 1974
In the area of Julianehåb granite along the south-west coast of Greeniand remnants of volcanic rocks are widespread. Well banded, intermediate tuffs occur on Mato and adjacent islands to the west of Julianehåb (Nesbitt, 1961; Allaart, 1967). Intermediate plagioclase-porphyritic rocks occur associated with aplitic gneiss north of Bredefjord.
S Pedersen, J.H Allaart, O Larsen
openaire   +2 more sources

Geochemistry of the metavolcanic rocks from the Archean Bikélélé greenstone belt (Chaillu Massif, Republic of the Congo): Petrogenesis and tectonic implications

Geosystems and Geoenvironment
The Bikélélé greenstone belt belongs to the Chaillu Massif, which corresponds to the northwestern part of the Congo Craton outcropping in the southwestern Republic of the Congo.
Yarsé Brodivier Mavoungou, Noël Watha-Ndoudy, Hardy Medry Dieu-Veill Nkodia, Anthony Temidayo Bolarinwa, Aliyu Ohiani Umaru, Georges Muhindo Kasay   +5 more
doaj   +1 more source

The 1.88 Ga Kotalahti and Vammala nickel belts, Finland: Geochemistry of the mafic and ultramafic metavolcanic rocks [PDF]

Bulletin of the Geological Society of Finland, 2009
The mafic and ultramafic volcanic rocks within the Svecofennian (1.88 Ga) Kotalahti and Vammala Nickel Belts, Finland, are spatially associated and coeval with a suite of mineralized mafic-ultramafic intrusions.
S.J. Barnes, H.V. Makkonen, S.E. Dowling, R.E.T. Hill, P. Peltonen   +4 more
doaj   +1 more source

Boninites in the ~3.3 Ga Holenarsipur Greenstone Belt, Western Dharwar Craton, India

Geosciences, 2018
In this contribution, we present detailed field, petrography, mineral chemistry, and geochemistry of newly identified high-Si high-Mg metavolcanic rocks from the southern part of the ~3.3 Ga Holenarsipur greenstone belt in the western Dharwar craton ...
Tarun C. Khanna, V. V. Sesha Sai, S. H. Jaffri, A. Keshav Krishna, M. M. Korakoppa   +4 more
doaj   +1 more source

Spatial Relations between Geological Structures and Precious and Base Metal Deposits from Magnetic Investigation of the Pangar-Djérem Zone, Cameroon

International Journal of Geophysics, 2023
The version three of Earth Magnetic Anomaly Grid (EMAG2-v3) used in this work is aimed at establishing the spatial relationships between tectonic structures and gold and associated mineralization in the Pangar-Djérem area, central and southern Cameroon ...
Constantin Mathieu Som Mbang, Marcelin Pemi Mouzong, Li Zhen Cheng, Jocelyne Laure Megne Tafone, Charles Antoine Basseka, Joseph Kamguia, Jacques Etamè   +6 more
doaj   +1 more source

Timing of Metamorphism and Deformation in the Neoarchean Quetico Metasedimentary Belt, Superior Craton, Constrained by Garnet Trace‐Element Mapping and Lu–Hf Geochronology

Journal of Metamorphic Geology, EarlyView.
ABSTRACT The Quetico subprovince of the Superior Province is among the largest metasedimentary belts globally and provides evidence of tectonic processes at play during the final stages of Archean cratonization. Although previous studies have shown that deformation and metamorphism of the 2.7‐Ga turbiditic protolith resulted in regional subvertical ...
Adrian G. Rehm, Antoine Godet, Doug Tinkham, Carl Guilmette, Matthijs A. Smit   +4 more
wiley   +1 more source

Petrology and structure of the early Proterozoic Pirilä gold deposit in southeastern Finland [PDF]

Bulletin of the Geological Society of Finland, 1988
The Pirilä gold deposit is located in the southeastern part of the Ladoga-Botnian Bay Zone, in a volcano-sedimentary environment metamorphosed under PT conditions of the amphibolite facies.
H. Makkonen, E. Ekdahl
doaj   +1 more source

Structure and Composition of Basement and Sedimentary Cover in the Southwestern Part of the Siljan Ring, Central Sweden: New Data from the C-C-1 Drill Core

Geosciences, 2021
The results from the geological and geophysical investigations of the Siljan Ring impact structure (central Sweden) have shown that the Paleozoic sedimentary succession and the Precambrian basement were strongly affected by complex deformational ...
Olga Sivalneva, Alexandr Postnikov, Vladimir Kutcherov, Marianna Tuchkova, Alexandr Buzilov, Viktor Martynov, Ilnur Sabirov, Elisaveta Idrisova   +7 more
doaj   +1 more source