Results 121 to 130 of about 823 (158)

Late-Collisional Granites in the Variscan Erzgebirge, Germany

Journal of Petrology, 1999
The late-collisional Erzgebirge granites (~325–318 Ma) were INTRODUCTION emplaced at shallow crustal levels in the Variscan metamorphic The Erzgebirge is a NE–SW trending antiformal structure basement shortly after large-scale extension caused by orogenic exposing Variscan crystalline basement rocks at the northcollapse.
H -J Förster, G Tischendorf, B Gottesmann   +2 more
exaly   +3 more sources

Do Variscan granites exist in south China?

Journal of Southeast Asian Earth Sciences, 1988
Abstract The question of the existence of Variscan granites in south China has long been under discussion. The authors have studied representative so-called Variscan granites such as the Darongshan Granites, the Weipu Granite as well as the Wuji Granodiorite and have found that the former two are of Indosinian (mainly Triassic in age), whereas the ...
Chen Tingyu
exaly   +2 more sources

Magnetic fabrics in Portuguese Variscan granites: structural markers of the Variscan orogeny

2020
<p>This work focuses on the magnetic fabric of 20 variscan granitic massifs from northern and central Portugal and considers the Anisotropy of Magnetic Susceptibility (AMS) results obtained in about 750 sampling sites. In the northern and central Portugal, three main ductile deformation phases were recognized and described: D&
Helena Sant Ovaia, Ana Gonçalves, Claudia Cruz, Fernando Noronha   +3 more
openaire   +1 more source

Granites and the nature of the Variscan Crust

Elements
Unlike the neighbouring cratonic crust, the orogenic crust of the European Variscan belt is granite-rich and seldom has a mafic lower layer. In this work, we compiled a database of ca. 1500 plutons, classified by type, to elucidate the evolution of the Belt and the origin of this uncommon crust.
Jean-François Moyen, Alexandra Guy, Patrizia Fiannacca, Vojtech Janoušek, Carlos Villaseca, Puy Ayarza Arribas   +5 more
openaire   +2 more sources

Variscan Granites from Brittany

1994
From Barrois (1884) to Barriere (1980) it is has been classical to divide Armorican Granites into three main units (Fig. 1): 1. A leucogranite belt which extends from the Pointe du Raz to Bressuire and Parthenay, emplaced during activity on the South Armorican Shear Zone (SASZ, Cogne 1960) and of its subsidiary faults. 2.
J.-P. Carron, M. Le Guen de Kerneizon, H. Nachit   +2 more
openaire   +1 more source

Postcollisional granites in the South Tien Shan Variscan Collisional Belt, Kyrgyzstan

Journal of Asian Earth Sciences, 2002
Abstract Two major types of the potassium-rich postcollisional granites of Permian age were studied in the South Tien Shan Variscan Collisional Belt. The first type, metaluminous granites of the Jangart complex, are located along the southeastern boundary of this belt with the Precambrian Tarim Block.
L.I Solomovich, B.A Trifonov
exaly   +2 more sources

Variscan granites of the Pyrenees revisited: their role as syntectonic markers of the orogen

Terra Nova, 1997
Structural studies of Variscan plutons of the Pyrenees demonstrate their syn‐orogenic character, contrasting with their post‐orogenic Permian Rb‐Sr datation. The Bassiès and Mont‐Louis‐Andorra plutons were emplaced before the main Variscan D2 phase and behaved as rigid markers during D2.
G. Gleizes, D. Leblanc, J.L. Bouchez
openaire   +1 more source

Reduced- or ilmenite-type granites versus oxidized- or magnetite-type granites: occurrence in Iberian Variscan Belt

2021
<p>The magnetic susceptibility (K<sub>m</sub>) of granites is an important characteristic and it is mainly controlled by the presence of certain oxide minerals like magnetite and/or ilmenite, as well as ferromagnesian phyllosilicates such as biotite.
Helena Sant Ovaia, Cláudia Cruz, Ana Gonçalves, Fernando Noronha   +3 more
openaire   +1 more source

Large Fossil Hydrothermal Systems in Variscan Granites and Pre-Variscan Gneisses of the Schwarzwald

Mineralogical Magazine, 1998
The Schwarzwald is part of the Moldanubium core zone of the Variscan fold belt. The basement consists of orthoand paragneisses of Caledonian and of Precambrian age. S-type granites are exposed in four different regions of the Schwarzwald: north, central, southwest and southeast. The granites of each region form a granite series, the separate intrusions
openaire   +1 more source

Emplacement of ellipsoid-shaped (diapiric?) granite: Structural and gravimetric analysis of the Oulmès granite (Variscan Meseta, Morocco)

Journal of African Earth Sciences, 2007
Abstract The Oulmes granite is a NE–SW elongated stock intruded in Ordovician metasedimentary rocks which crop out at the core of a regional anticlinorium of the Moroccan Variscan Meseta. The stock, dated at around 300 Ma, is made up of peraluminous two-mica granite, with subordinate amounts of muscovite leucogranite. Mineral composition and textural
Abdelfatah Tahiri, J. Fernando Simancas, Antonio Azor, Jesús Galindo-Zaldívar, Francisco González Lodeiro, Hassan El Hadi, David Martínez Poyatos, Ana Ruiz-Constán   +7 more
openaire   +1 more source