Results 11 to 20 of about 343 (178)

A Geochemical Overview of Mid-Archaean Metavolcanic Rocks from Southwest Greenland [PDF]

open access: yesGeosciences, 2018
The present contribution reviews bulk-rock geochemical data for mid-Archaean (ca. 3075–2840 Ma) metavolcanic rocks from the North Atlantic Craton of southwest Greenland.
Kristoffer Szilas
doaj   +4 more sources

Nature, affinities and significance of metavolcanic rocks in the Outokumpu assemblage, eastern Finland [PDF]

open access: yesBulletin of the Geological Society of Finland, 1984
The rock association of serpentinite‒chrome-silicate skarn‒dolomite-quartz rock‒black schist in the Outokumpu region, in which polymetallic sulphide ore deposits occur, has been compared to an ophiolite.
A.F. Park
doaj   +2 more sources

Gold exploration in the Gabal Abu Karahish area, Central Eastern Desert, Egypt: an integrated geological perspective [PDF]

open access: yesScientific Reports
This study aims to explore the presence and distribution of gold deposits in the Gabal Abu Karahish area by identifying hydrothermal alteration zones associated with favorable geological settings.
Mahmoud Abd El-Rahman Hegab   +6 more
doaj   +2 more sources

U-Pb (Zircon) Ages of Metavolcanic Rocks From the Itaiacoca Group: Tectonic Implications [PDF]

open access: yesGeologia USP. Série Científica, 2003
The main aim of this work is to present and discuss the U-Pb ages obtained for zircon grains from metavolcanic rocks of theItaiacoca Group. The Itaiacoca Group is a metavolcano-sedimentary sequence, which occurs as a narrow belt between theCunhaporanga ...
Oswaldo Siga Jr.   +8 more
doaj   +3 more sources

Palaeoproterozoic mafic and intermediate metavolcanic rocks in the Turku area, SW Finland [PDF]

open access: yesBulletin of the Geological Society of Finland, 2007
Twenty two samples were analysed from mafic and intermediate volcanic rocks from the Turku area along ~60 km long north-south geotraverse. Geographically and lithologically the samples were divided into the Pargas, Turku and Vahto groups.
M. Väisänen, G. Westerlund
doaj   +2 more sources

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

open access: yesGeosystems 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.
Hardy Medry Dieu-Veill Nkodia   +2 more
exaly   +3 more sources

Multi-method characterization of rare blue quartz-bearing metavolcanic rocks of the Rio dos Remédios Group, Paramirim Aulacogen, NE Brazil [PDF]

open access: yesBrazilian Journal of Geology, 2023
The Rio dos Remédios Group comprises a supracrustal sequence that occupies the base of the Espinhaço Supergroup, São Francisco Craton, Brazil. Its basal formation, Novo Horizonte, crops out in the Paramirim region mainly as metavolcanic rocks that ...
Danielle Cruz da Silva   +4 more
doaj   +1 more source

Hydrocarbons in the Säviä volcanic schist zone, central Finland [PDF]

open access: yesBulletin of the Geological Society of Finland, 1987
Light hydrocarbon gases have been analysed from 21 samples of hydrothermally unaltered and 11 samples of hydrothermally altered metavolcanic rocks from the Säviä volcanic schist zone in the southwestern part of the Proterozoic Vihanti— Pyhäsalmi ...
K. Rasilainen
doaj   +1 more source

Geology and Lithogeochemistry of the Supracrustal Sequence and Interlayered Metabasites of NE Santos Dumont Region (MG) [PDF]

open access: yesAnuário do Instituto de Geociências, 2017
The region near Santos Dumont town consists of a sequence of interlayered metabasic rocks and supracrustal gneisses. Two lithological units were individualized based on geological-structural mapping (1:50,000), petrography and lithogeochemistry: a ...
Renata Hiraga   +5 more
doaj   +1 more source

Strain analysis in the Orijärvi triangle, southwestern Finland; in perspective of tectonic models [PDF]

open access: yesBulletin of the Geological Society of Finland, 1999
Finite strain analyses were performed in metavolcanic rocks (agglomerates and pillowed metabasalts) from the Orijärvi area, southwestern Finland. In this area, tight folding (F1) of layered metasedimentary rocks and development of a penetrative axial ...
H. Stel, D. Van Rees, B. Schenke
doaj   +1 more source

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