Results 161 to 170 of about 297,462 (204)

The geology and petrology of the metavolcanic rocks of the Kvakhona Formation of the Sredinnyi Range crystalline massif in Kamchatka

Russian Journal of Pacific Geology, 2013
The metavolcanic rocks of the Kvakhona Formation exposed on the western slopes of the Sredinnyi Range metamorphic massif are represented by two sequences. The lower sequence occupying the most part of the exposed formation is dominated by porphyric and aphyric clinopyroxene-plagioclase metabasalts and their tuffs with subordinate metapicritic basalts ...
I A Tararin, Z G Badredinov
exaly   +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.
Jin Liu, Changquan Cheng
exaly   +2 more sources

Geochemistry and petrogenesis of the Neoarchean Sandur metavolcanic rocks

2020
The Sandur greenstone belt (SGB) is a distinctive greenstone belt as it is perched within the Closepet granitoid rocks (CG). The emplacement of the CG is attributed to intrusion in a crustal scale transcurrent shear zone towards the end of Archaean (Moyen et al., 2003).
Subarna Baidya, Anshuman Giri, Anand Rajagopal   +2 more
openaire   +1 more source

Composition and origin of metamorphosed ferromanganese rocks in metavolcanics of Eastern Kamchatka

Russian Journal of Pacific Geology, 2009
This paper presents detailed mineralogical and geochemical data on the metamorphosed ferromanganese rocks observed as rare lenticular bodies among the metavolcanics of the Khavyven Highland and Ganal Ridge in Eastern Kamchatka. They are specific porphyry-type banded Mn-garnet and amphibole rocks with large (up to 1–5 mm) magnetite porphyroblasts.
I. A. Tararin, Z. G. Badredinov, Ye. A. Nozdrachev, O. I. Sharova   +3 more
openaire   +1 more source

Antiperthites in a metavolcanic rock

Geologiska Föreningen i Stockholm Förhandlingar, 1973
Abstract Antiperthites from the wall rock of the Kiirunavaara iron ore are discussed in the light of their chemical composition. According to the microprobe analysis, the content of Na in microcline and K in albite is low (Ab2 and Or0.3 approximately).
openaire   +1 more source

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.
Sebastian Viehmann, Carsten Munker, J Elis Hoffmann   +2 more
exaly   +2 more sources

Soils on igneous and metavolcanic rocks in the Sonoran Desert of Baja California, Mexico

Geoderma, 1992
Soils were examined on the widespread volcanic, plutonic and metavolcanic rocks within the Sonoran Desert of Baja California. In order to focus on in situ weathering and pedogenesis, most of the soils studied were on stable, nearly level summits. The combination of summit landscape positions and the aridic moisture regime tended to yield shallow soils,
R.C. Graham, E. Franco-Vizcaino
openaire   +1 more source

Geochemistry and tectonic significance of the Ongarbira metavolcanic rocks, Singhbhum District, India

Precambrian Research, 1994
Abstract The volcanic-sedimentary sequence of Ongarbira occurs to the south of the Singhbhum Shear Zone and rests uncomformably on a basement topographic-low between the Chakradharpur Granite and the Singhbhum Granite. Structural analysis reveals that the Ongarbira synform and other adjoining structures are kilometre-scale first-generation folds on E-
W.H. Blackburn, D.C. Srivastava
openaire   +1 more source

Metavolcanic rocks and their origin, Southern Adirondack mountains, New York

Bulletin Volcanologique, 1970
One of the problems associated with massif-type anorthosite in high grade metamorphic terranes is the absence of anorthositic extrusives. However, if anorthosite formed by crystal segregation, volcanic equivalents of the final fluid differentiate might occur.
openaire   +1 more source

Geochemistry of the Archaean Metavolcanic Rocks of Kolar and Hutti Gold Fields, Karnataka, India

Journal Geological Society of India, 1979
Abstract Geochemical data on Archaean goldfields metavolcanics (2.7 b. yrs) have been plotted on major and minor element discriminant diagrams to define the magma type and to formulate the tectonic environment model for the origin of these ancient volcanic rocks.
Iyer, GVA, Vasudev, VN
openaire   +1 more source