Results 1 to 10 of about 1,706 (214)

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

Geosciences, 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   +6 more sources

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

Geologia 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., Miguel Angelo Stipp Basei, Kei Sato, Hélcio José dos Prazeres Filho, Leonardo Fadel Cury, Werner Weber, Cláudia Regina Passarelli, Ossama Mohamed Harara, José Manoel dos Reis Neto   +8 more
doaj   +5 more sources

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

Brazilian 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, Lauro Montefalco, Gláucia Queiroga, Glenda Lira Santos, Mahyra Tedeschi   +4 more
doaj   +2 more sources

The Pyhäntaka formation, Southern Finland: A sequence of metasandstones and metavolcanic rocks upon an intra-orogenic unconformity [PDF]

Bulletin of the Geological Society of Finland, 2011
Detrital zircon studies suggest that the few quartzite occurrences in southern Finland are younger than 1.87 Ga and express sedimentation after 1.89–1.87 Ga accretional deformation and metamorphism in the Svecofennian orogenic belt.
M. Nironen
doaj   +2 more sources

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

Scientific 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, Salem Mohamed Salem, Nehal Mohamed Soliman, Sobhi Mahmoud Ghoneim, Kareem Hamed Abd El Wahid, Hala Fouad Ali, Mohamed Anwar Ahmed   +6 more
doaj   +2 more sources

Petrogenesis of the Early Paleoproterozoic Felsic Metavolcanic Rocks from the Liaodong Peninsula, NE China: Implications for the Tectonic Evolution of the Jiao-Liao-Ji Belt, North China Craton

Minerals (Basel, Switzerland), 2023
The early Paleoproterozoic (ca. 2.2–2.1 Ga) tectonic evolution of the Jiao–Liao–Ji belt (JLJB) is a continuous hot topic and remains highly controversial.
Changquan Cheng, Jin Liu
exaly   +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, Noel Watha-Ndoudy, Hardy Medry Dieu-Veill Nkodia   +2 more
exaly   +3 more sources

Combined bulk-rock Hf- and Nd-isotope compositions of Mesoarchaean metavolcanic rocks from the Ivisaartoq Supracrustal Belt, SW Greenland: Deviations from the mantle array caused by crustal recycling

Chemie Der Erde, 2016
Bulk-rock Lu-Hf and Sm-Nd isotope compositions, as well as major and trace element data are presented for metavolcanic rocks from the Mesoarchaean (ca. 3075 Ma) Ivisaartoq Supracrustal Belt in the Nuuk region of southern West Greenland.
Kristoffer Szilas, J Elis Hoffmann, Toni Schulz   +2 more
exaly   +2 more sources

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   +2 more sources

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   +2 more sources