Results 171 to 180 of about 1,706 (214)
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Precambrian Research, 2021
Abstract As a typical continent–continent collision belt, the Khondalite Belt (KB) of the North China Craton (NCC) represents a Paleoproterozoic orogenic belt that underwent subduction and collision. Although many high-grade metamorphic rocks have been well studied, the low to medium grade metamorphic rocks well preserved in KB are less studied ...
Xu-Ping Li, Changqing Yin
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Abstract As a typical continent–continent collision belt, the Khondalite Belt (KB) of the North China Craton (NCC) represents a Paleoproterozoic orogenic belt that underwent subduction and collision. Although many high-grade metamorphic rocks have been well studied, the low to medium grade metamorphic rocks well preserved in KB are less studied ...
Xu-Ping Li, Changqing Yin
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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).
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 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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Canadian Journal of Earth Sciences, 1977
Base metal and gold ores in thin calc-silicate and cordierite gneiss units at Montauban-Les-Mines have historically been described as pyrometasomatic deposits related to granitic intrusions. They are stratigraphically overlain by quartzo–feldspathic gneiss and amphibolite, the uppermost amphibolite unit being a pillowed metabasalt.Chemical analysis ...
Karen Stamatelopoulou-Seymour +1 more
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Base metal and gold ores in thin calc-silicate and cordierite gneiss units at Montauban-Les-Mines have historically been described as pyrometasomatic deposits related to granitic intrusions. They are stratigraphically overlain by quartzo–feldspathic gneiss and amphibolite, the uppermost amphibolite unit being a pillowed metabasalt.Chemical analysis ...
Karen Stamatelopoulou-Seymour +1 more
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