Results 131 to 140 of about 343 (178)
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Geochemistry of the Yandal belt metavolcanic rocks, Eastern Goldfields Province, Western Australia
Australian Journal of Earth Sciences, 2000Archaean felsic metavolcanic rocks occur throughout the Yandal belt in the north of the Eastern Goldfields of Western Australia where they are most abundant in the higher parts of the stratigraphy. With the exception of the Spring Well Sequence at the southern end of the belt, these rocks are typically dacites showing geochemical affinities with ...
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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, Badredinov Z G, Tararin I A
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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, Badredinov Z G, Tararin I A
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Geochemistry and petrogenesis of the Neoarchean Sandur metavolcanic rocks
2020The 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 +2 more
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Composition and origin of metamorphosed ferromanganese rocks in metavolcanics of Eastern Kamchatka
Russian Journal of Pacific Geology, 2009This 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 +3 more
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Antiperthites in a metavolcanic rock
Geologiska Föreningen i Stockholm Förhandlingar, 1973Abstract 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).
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Soils on igneous and metavolcanic rocks in the Sonoran Desert of Baja California, Mexico
Geoderma, 1992Soils 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
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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
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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
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Geochemistry of Archaean Metavolcanic Rocks from the Kudremukh Area, Karnataka
Journal Geological Society of India, 1981Abstract Major and trace element data for metabasaits and metaperidotites from the littleknown Archaean volcanic-sedimentary belt at Kudremukh are presented. The dominant rocks are low K tholeiites showing evidence of partial melting from a Zr, Y and Nb enriched, P and Ta depleted mantle source, at depths where garnet was stable in ...
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