Results 11 to 20 of about 374 (186)

The age and origin of the Vaasa migmatite complex revisited [PDF]

Bulletin of the Geological Society of Finland, 2014
The origin of the Vaasa migmatite complex was studied by using whole-rock Sm-Nd and zircon Lu-Hf and U-Pb data in conjunction with whole-rock major and trace element geochemistry.
E. Suikkanen, H. Huhma, M. Kurhila, Y. Lahaye   +3 more
doaj   +1 more source

Tectono-metamorphic evolution and timing of the melting processes in the Svecofennian Tonalite-Trondhjemite Migmatite Belt: An example from Luopioinen, Tampere area, southern Finland [PDF]

Bulletin of the Geological Society of Finland, 1999
The Svecofennian Orogen is in southern Finland characterized by two major migmatite belts. These are the so-called Granite Migmatite Belt, in which Kfs-rich leucosomes predominate, and the Tonalite-Trondhjemite Migmatite Belt, which is characterized by ...
H. Mouri, K. Korsman, H. Huhma
doaj   +1 more source

Melt inclusions in migmatites and granulites [PDF]

Journal of the Virtual Explorer, 2011
Important advances have been made during the last 15 years in the study of melt inclusions in minerals from migmatites and granulites. Pioneer work on high temperature metapelitic anatectic enclaves in peraluminous dacites from SE Spain has shown that droplets of granitic melt can be trapped by minerals growing during incongruent melting reactions, and
CESARE, BERNARDO, ACOSTA VIGIL A, FERRERO S, BARTOLI, OMAR   +3 more
openaire   +2 more sources

Formation mechanism of the Vaasa Batholith in the Fennoscandian shield: Petrographic and geochemical constraints [PDF]

Bulletin of the Geological Society of Finland, 2012
The ~1.88 Ga Vaasa Batholith in western Finland is a large granitoid area (8 000 km2) with gradational contacts against the garnet- and cordierite-bearing diatexite and metatexite migmatites of the Pohjanmaa Belt.
H. Mäkitie, P. Sipilä, H. Kujala, A. Lindberg, A. Kotilainen   +4 more
doaj   +1 more source

Intracratonic Palaeoproterozoic granitoids in northern Finland: Prolonged and episodic crustal melting events revealed by Nd isotopes and U-Pb ages on zircon [PDF]

Bulletin of the Geological Society of Finland, 2007
Zircons from twelve Palaeoproterozoic granitoids from the Central Lapland Granitoid Complex (CLGC) and from the Hetta Complex (HC) in northern Finland were dated using the NORDSIM ion microprobe.
N. Ahtonen, P. Hölttä, H. Huhma
doaj   +1 more source

The corridor of mineralization in the California gold district, in the Santander Department of Colombia

Journal of the Geological Survey of Brazil, 2021
In the Santander Massif of the Eastern Cordillera of Colombia, intense Pliocene to Holocene sulfide-rich gold mineralization occurs in a six kilometers long section of the La Baja fault zone, where it crosses partially migmatized gneisses and intrusions ...
Wilson Scarpelli
doaj   +1 more source

Petrology, geochemistry, and geochronology of the leucogranites in southernmost Finland [PDF]

Bulletin of the Geological Society of Finland
In the southernmost part of the Svecofennian province in Finland, leucogranites and migmatites stemming from both igneous and sedimentary protoliths reflect the complex magmatic history of the Svecofennian orogeny between 1.89 and 1.82 Ga.
Anna Saukko, Kaisa Nikkilä, Olav Eklund, Sören Fröjdö, Markku Väisänen   +4 more
doaj   +1 more source

Structure of a Variscan migmatite-granite transition zone (N Sardinia, Italy)

Journal of Maps, 2023
This paper presents the structural map of the Barrabisa Complex, an E-W ribbon-like migmatitic massif exposed in the northern part of Sardinia. The migmatites consist of metatexites and diatexites with variable melt proportion, grading in the central ...
M. De Luca, N. Ruberti, G. Oggiano, Ph. Rossi, V. Pascucci, L. Casini   +5 more
doaj   +1 more source

The Djourdé-Sinassi magmatic-migmatitic complex, Northern Cameroon: a record of vertical extrusion of the Pan-African partially molten orogenic root

BSGF - Earth Sciences Bulletin
The Djourdé-Sinassi magmatic-migmatitic complex is part of the juvenile Neoproterozoic Garoua Domain located in Northern Cameroon. It is surrounded by the Zalbi, Poli and Rey-Bouba greenstone belts, limited to the east by the sinistral Tcholliré-Banyo ...
Tiani Djuimou Suzanne, Bouyo Houketchang Merlain, Vanderhaeghe Olivier, Achu Megnemo Ludovic, Azefack Mbounou Loïque Rodolph, Gregoire Michel, Kagou Dongmo Armand   +6 more
doaj   +1 more source

An analogue model of melt segregation and accumulation processes in the Earth’s crust [PDF]

Estonian Journal of Earth Sciences, 2007
An analogue experiment was carried out to model melt segregation from the solid rock matrix and its subsequent transport. Carbon dioxide gas and sand were used as analogue materials of crustal partial melt and host rock, respectively.
Soesoo, Alvar, Urtson, Kristjan
doaj