Results 31 to 40 of about 1,706 (214)

THE NEOPROTEROZOIC ISLAND-ARC ASSOCIATION OF THE MUKODEK GOLD-ORE FIELD, NORTHERN BAIKAL AREA

Геодинамика и тектонофизика, 2015
Metamorphosed volcanic rocks of the Ushmukan suite were studied in the Mukodek gold-ore field located in the Baikal-Muya belt in the Northern Baikal area, Russia. The Ushmukan suite shows interleaving of ortoschists which compositions are widely variable.
V. A. Vanin, D. P. Gladkochub, T. V. Donskaya   +2 more
doaj   +1 more source

The Encantada Granite: registration of a peraluminous intrusion in the Rondonian Province - San Ignacio, in SW Amazonic Craton, Mato Grosso, Brazil [PDF]

Geologia USP. Série Científica, 2015
The Encantada Granite occurs on the extreme southwest of the state of Mato Grosso, SW of the Amazonian Craton, near the border of Brasil/Bolívia. It corresponds to an body oriented to NNW direction that intruded metasedimentary and metavolcanic rocks ...
Brena Verginassi do Nascimento, Carlos Humberto da Silva, Ana Cláudia Dantas da Costa   +2 more
doaj   +1 more source

PHYSICAL-MECHANICAL PROPERTIES OF METAVOLCANIC ROCKS OF THE MOUNTAIN CRIMEA

Engineering Geology, 2018
The article considers the petrogenetic features of the volcanogenic rocks of the Middle Jurassic age of the Mountain Crimea and analyzes their influence on physical (density, porosity, water absorption, and magnetic susceptibility) and physical-mechanical properties (strength, modulus of elasticity, and Poisson's ratio). Among volcanogenic strata there
J. V. Frolova, V. V. Ladygin, E. M. Spiridonov, G. N. Ovsyannikov   +3 more
openaire   +1 more source

U-Pb dating, Lu-Hf isotope systematics and chemistry of zircon from the Morro do Polvilho meta-trachydacite: constraints on sources of magmatism and on the depositional age of the São Roque Group

Geologia USP. Série Científica, 2018
We present new in situ geochronological data of controversial silicic metavolcanic rocks from the lower terrigenous-metavolcanic sequence of the São Roque Group, Ribeira Belt, confirming that they are older than the rocks of higher-metamorphic grade ...
Renato Henrique-Pinto, Valdecir de Assis Janasi, Ginaldo Ademar da Cruz Campanha   +2 more
doaj   +1 more source

The Mesoproterozoic sub-Heddersvatnet unconformity, Telemark, South Norway [PDF]

Bulletin of the Geological Society of Finland, 2005
The 1.51 Ga Rjukan group,Telemark, S Norway, is divided into felsic volcanic rocks of the Tuddal formation and mafic rocks of the Vemork formation. It is overlain by the sedimentary rocks of the Vindeggen group (1.50-1.17 Ga), starting with the arkosic ...
K. Laajoki
doaj   +1 more source

Metagabbros, metasyenites and related rocks in the Outokumpu assemblage, east Finland [PDF]

Bulletin of the Geological Society of Finland, 1992
A diverse group of minor intrusive rocks in the early Proterozoic Outokumpu assemblage of eastern Finland include metagabbro, hornblendite, amphibolite, pyroxenite, syenite and chloritized dykes.
A.F. Park
doaj   +1 more source

Geochemical and U-Pb and Sm-Nd isotopic constraints on the evolution of the Paleoproterozoic Ylitornio nappe complex, northern Fennoscandia [PDF]

Bulletin of the Geological Society of Finland, 2019
The Ylitornio area in northern Finland is a typical example of a poorly outcropping, multiply deformed, complex Precambrian terrain. U–Pb, Sm-Nd and geochemical data from metavolcanic, metasedimentary and plutonic rocks combined with structural data ...
Raimo Lahtinen, Hannu Huhma, Laura S. Lauri, Mohammad Sayab   +3 more
doaj   +1 more source

Lithostratigraphy of the early Proterozoic Kainuu Schist Belt in the Kurkikylä-Siikavaara area, northern Finland, with emphasis on the genetic approach [PDF]

Bulletin of the Geological Society of Finland, 1989
The early Proterozoic (Karelian) supracrustal formations of the northeastern part of the Kainuu Schist Belt in the Kurkikylä-Siikavaara area in northern Finland are formally classified into the Kurkikylä, Korvuanjoki and East Puolanka Groups.
K. Laajoki, K. Strand, P. Härmä
doaj   +1 more source

Hydrothermal Alteration Mapping Using Landsat 8 and ASTER Data and Geochemical Characteristics of Precambrian Rocks in the Egyptian Shield: A Case Study from Abu Ghalaga, Southeastern Desert, Egypt

Remote Sensing, 2022
This study evaluates the geological attributes of rocks within the Abu Ghalaga area using spatial, geochemical, and petrographic approaches. ASTER and Landsat imagery processed using band ratio and principal component analysis were used to map ...
Hatem M. El-Desoky, Andongma W. Tende, Ahmed M. Abdel-Rahman, Antoaneta Ene, Hamdy A. Awad, Wael Fahmy, Hamada El-Awny, Hesham M. H. Zakaly   +7 more
doaj   +1 more source

Lithostratigraphy of the Mesoproterozoic Vemork formation, central Telemark, Norway [PDF]

Bulletin of the Geological Society of Finland, 2007
The Vemork formation forms a c. 2 km thick volcanic-sedimentary unit above the 1510 – 1500 Ma old Tuddal felsic volcanite formation, the oldest unit of the Mesoproterozoic Telemark supracrustals in southern Norway.
K. Laajoki, F. Corfu
doaj   +1 more source