Results 91 to 100 of about 313,354 (211)

A test of two alteration indices as predictors of argon loss in basic rocks

, 1984
It has been proposed that the degree of alteration of basic rocks, as quantified by alteration indices based on H2O+ contents or X-ray diffraction methods, can be used as a predictor of Ar loss.
Higgins, Michael D.
core   +1 more source

The role of crustal contamination in magma evolution of Neoproterozoic metaigneous rocks from Southwest Svalbard

, 2022
Late Neoproterozoic metavolcanic rocks occur along the Southwest coast of Svalbard. The protoliths of the metavolcanic rocks from Wedel Jarlsberg Land and Nordenskiold Land are mainly diabase, basalt and felsic tuff of tholeiitic affinity associated with
Czerny, Jerzy,, Kosminska, Karolina, Faehnrich, Karol, Ellam, Robert M., Kosminska, Karolina,, Manecki, Maciej, Majka, Jaroslaw, Goluchowska, Karolina, Majka, Jaroslaw,, Goluchowska, Karolina,, Barker, Abigail,, Bazarnik, Jakub, Ellam, Robert M.,, Bazarnik, Jakub,, Czerny, Jerzy, Faehnrich, Karol,, Manecki, Maciej,, Barker, Abigail, Robert M. Ellam, Maciej Manecki, Jarosław Majka, Karolina Gołuchowska, Jakub Bazarnik, Jerzy Czerny, Karolina Kośmińska, Abigail K. Barker, Karol Faehnrich   +26 more
core   +1 more source

Bioerosion and bioturbation of a weathered metavolcanic rock (Cretaceous, Czech Republic)

Acta geológica hispánica, 2002
The locality of Marsovicky Hill (N Bohemia, Czech Republic) yielded an example of a Cretaceous sea-bottom composed of Nametarhyolite. Two types of trace fossils penetrate the substrate, namely Thalassinoides isp. and ?Gastrochaenolites isp. Thalassinoides originated presumably in a firmground, i.e.
MIKULÁS, R., NEMECKOVÁ, M., ADAMOVIC, J.   +2 more
openaire   +2 more sources

Stratigraphy and structure of Mesozoic metavolcanic rocks in the vicinity of Mt. Dana, Yosemite National Park, California.

, 1976
Mt. Dana is one of several high peaks along the Sierra Nevada crest on the eastern boundary of Yosemite National Park (Fig. 1). The mountain is underlain by metamorphic rocks which form the northern extension of the Ritter Range roof pendant, an elongate
Russell, Stephen John.
core  

Mafic magmatism associated with the Goi's magmatic arc in the Anicuns region, Goi's, central Brazil: Sm-Nd isotopes and new ID-TIMS and SHRIMP U-Pb data

, 2015
Rocks exposed in the Anicuns region, in the eastern part of the Goiás magmatic arc, are represented dominantly by amphibolites (metavolcanic and metaplutonic) and metapelitic rocks.
Pimentel, Marcio, Dantas, Elton L, Armstrong, Richard, Laux, Jorge H, Nilson, Ariplinio, Armele, Alan   +5 more
core   +1 more source

Petrology, Structure, and Geochronology of the Oakville Metavolcanic Sequence: Implications for the Provenance of the Smith River Allochthon, Virginia

, 2022
The Smith River Allochthon (SRA), a suspect terrane in the southwestern Piedmont of Virginia, is interpreted as a regional scale thrust sheet of metaclastic and meta-igneous rocks emplaced over lower-grade greenschist facies assemblages.
Kortan, Matt
core   +1 more source

Nagssugtoqidian supracrustal metavolcanic rocks of Sarfartûp nunâ, Søndre Strømfjord, central West Greenland

Rapport Grønlands Geologiske Undersøgelse, 1974
The area discussed here is situated 8 km north of the Sukkertoppen Iskappe and 10 km east of Søndre Strømfjord at 66°27'N, 51°50'W. The work was undertaken during August as part of the programme led by Dr. J. Watterson (see this report). The outcrop of supracrustal metavolcanic rocks is less than 15 km2 in extent.
J.N Diggens, C Talbot
openaire   +2 more sources

Basic and ultrabasic volcanic rocks from the Argyll Group (Dalradian) of NE Scotland

, 2016
The Dalradian Supergroup of the Scottish Highlands is a largely metasedimentary succession of Neoproterozoic to Early Cambrian age, metamorphosed during the Caledonian Orogeny. The rocks were deposited on the Laurentian margin during
D. J. Fettes (2842961), C. M. Graham (2844977), R. Macdonald (2839973), D. Stephenson (2839961)   +3 more
core   +1 more source

Geology, geochemistry and Sr–Nd constraints of selected metavolcanic rocks from the eastern boundary of the Saharan Metacraton, southern Sudan : a possible revision of the eastern boundary [PDF]

, 2016
Neoproterozoic, Pan-African low-grade metavolcanic rocks and associated mafic and ultramafic rocks of ophiolitic origin have long been identified within the pre-Neoproterozoic Saharan Metacraton (SMC). These low-grade rocks within generally high-grade (
Abdelrahman, E.M., Bumby, Adam John, Eriksson, Patrick George, Ibinoof, M.A., Le Roux, P.J., Grantham, G.H.   +5 more
core   +1 more source

Geology and petrology of the kösedağ metavolcanic rocks to the south of Tosya

, 2020
Kösedağ metavolkanik kayaları, güney Orta Pontidler'de, Tosya'nın güneyinde KD-GB uzanımlı bir kuşak boyunca yüzlek verirler. Birim metasedimanter litolojilerle ardalanan metavolkanik kayalardan oluşur. Kösedağ Metavolkanikleri kuzeyde Kuzey Anadolu Fay'ı ile sınırlanırken, güneyde Dikmen Formasyonu'nun metakarbonatlarını tektonik ...
openaire   +1 more source