Results 1 to 10 of about 343 (178)

Age of the Tokkalehto metagabbro and its significance to the lithostratigraphy of the early Proterozoic Kuusamo supracrustal belt, northern Finland [PDF]

Bulletin of the Geological Society of Finland, 2001
The c. 30-km2 Tokkalehto metagabbro and associated sills and dykes intrude a large part of the western part of the early Proterozoic Kuusamo supracrustal belt in northern Finland. These rocks have previously been mapped as a metavolcanic unit, Greenstone
P.M. Evins, K. Laajoki
doaj   +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
doaj   +1 more source

Tourmalinites of the Brusque Group in the São João Batista-Tijucas area, State of Santa Catarina, Brazil [PDF]

Geologia USP. Série Científica, 2013
The Dom Feliciano Belt, in the State of Santa Catarina, is represented by the Itaja and Brusque groups and the Florianpolis Batholith. The basal Rio do Oliveira Formation of the Brusque Group consists of metabasic/calc-silicate, metavolcanic-exhalative ...
Miguel Angelo Stipp Basei, Fabio Brentan, Gianna Maria Garda   +2 more
doaj   +1 more source

U-Pb SHRIMP and Sm-Nd geochronology of the Silvânia Volcanics and Jurubatuba Granite: juvenile Paleoproterozoic crust in the basement of the Neoproterozoic Brasília Belt, Goiás, central Brazil

Anais da Academia Brasileira de Ciências, 2001
U-Pb SHRIMP and Sm-Nd isotopic ages were determined for felsic metavolcanic rocks from the Silvânia Sequence and Jurubatuba Granite in the central part of the Brasília Belt.
FISCHEL DANIELLE P., PIMENTEL MÁRCIO M., FUCK REINHARDT A., ARMSTRONG RICHARD   +3 more
doaj  

The Salittu Formation in southwestern Finland, part I: Structure, age and stratigraphy [PDF]

Bulletin of the Geological Society of Finland, 2016
Because of the relatively low metamorphic grade, low strain and well-preserved early structures in volcanic and volcaniclastic rocks, the Orijärvi triangle (in the center of the larger Orijärvi area) is one of the few locations in the Svecofennian orogen
M. Nironen, I. Mänttäri, M. Väisänen
doaj   +1 more source

The Subduction-Related Metavolcanic Rocks of Maroua, Northern Cameroon: New Insights into a Neoproterozoic Continental Arc Along the Northern Margin of the Central African Fold Belt

Geosciences
The metavolcanic rocks around Maroua in the Far North Region of Cameroon are located at the northern margin of the Central African Fold Belt (CAFB) and have not been studied to date.
Pierre Christel Biakan à Nyotok, Merlin Gountié Dedzo, Diddi Hamadjoda Djamilatou, Nils Lenhardt, Moussa Ngarena Klamadji, Periclex Martial Fosso Tchunte, Pierre Kamgang   +6 more
doaj   +1 more source

Bioerosion and bioturbation of a weathered metavolcanic rock (Cretaceous, Czech Republic)

Acta geológica hispánica, 2002
The locality of Marsovicky Hill (N Bohemia, Czech Republic) yielded an example of a Cretaceous sea-bottom composed of Nametarhyolite. Two types of trace fossils penetrate the substrate, namely Thalassinoides isp. and ?Gastrochaenolites isp. Thalassinoides originated presumably in a firmground, i.e.
MIKULÁS, R., NEMECKOVÁ, M., ADAMOVIC, J.   +2 more
openaire   +2 more sources

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

Supplemental Material: Gold mobilization during metamorphic devolatilization of Archean and Paleoproterozoic metavolcanic rocks

, 2020
Additional information on whole rock geochemistry.<br>
et al., Clifford Patten
openaire   +2 more sources

Geochemical and remote sensing insights into the hydrothermal origin of Banded Iron Formations at the Fatira Site, Northern Egyptian Nubian Shield

Scientific Reports
This study combines remote sensing, geochemical data, mineralogical analyses, and field investigations to examine the hydrothermal origin of the Banded Iron Formations (BIFs) in the Fatira region of the Egyptian Nubian Shield.
ElSayed A. Saber, Mohamed A. Abd El-Wahed, Omar R. Shalaby, Ahmed A. El-Sheikh, Mohamed Attia   +4 more
doaj   +1 more source