Results 181 to 190 of about 23,165 (232)

Amphibolites of the Cartersville District, Georgia

Geological Society of America Bulletin, 1971
The Cartersville district, which is bisected by the boundary between the Valley and Ridge and Piedmont provinces, contains thick lenses of thinly bedded, greenschist facies amphibolite in the southeastern (Piedmont) part that appear to correlate with lenses of carbonate-rich sedimentary rock in the Lower Cambrian Rome Formation to the northwest ...
THOMAS L. KESLER, STEPHEN E. KESLER
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Eclogitic amphibolites from the Grampian Moines

Mineralogical Magazine, 1986
AbstractAmphibolites from the Grampian Moines of Scotland contain clinopyroxene-plagioclase symplectites and plagioclase-hornblende coronas around garnet. The clinopyroxene-plagioclase symplectites are interpreted as former omphacites. It is inferred that an eclogitic garne-tomphacite-quartz assemblage once existed, but has since undergone partial ...
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Amphibolitization of mafic crust: mechanism and time scales

Goldschmidt2025 abstracts
Fluid–rock interactions play a key role in the formation, evolution and recycling of the Earth’s crust. For fluids to infiltrate rocks and enable and sustain fluid-mediated mineral transformations, fluid pathways are required. Time scales of fluid-mediated rock transformations cover a wide range from several million years to several
Timm John, Saskia Grund, Johannes Vrijmoed   +2 more
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Water-induced Weakening of Hornblende and Amphibolite

Nature, 1969
THE disparity between the great laboratory strength of silicate rocks and their apparent weakness in nature, suggested by stress drops associated with earthquakes, remains a persistent problem in tectonics. The strength disparity sometimes approaches three orders of magnitude.
ROBERT E. RIECKER, THOMAS P. ROONEY
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The Amphibolite of Doir'a'Chatha (Durcha), Sutherland

Geological Magazine, 1958
AbstractThe amphibolite at Durcha passes from a dark, hornblende-rich rock, through every gradation of delicate striping and banding by quartzo-feldspathic material out into psammitic Moine schist, within a few metres. Irregular cross-cutting bands of quartz and feldspar which seem to “ feed ” the delicate stripes can be seen and there are intergrown ...
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Eclogitic and glaucophane amphibolites in Venezuela

Eos, Transactions American Geophysical Union, 1950
Several occurrences of amphibolites with sodic pyroxenes and am phiboles are found in association with garnet amphibolites within the metamorphosed sedimentary rocks of northern Venezuela. They are interpreted as having been, originally, shallow basic intrusive rocks and perhaps tuffaceous sediments.
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Plagioclase porphyroblasts from an amphibolite paleozome

Lithos, 1972
Abstract Plagioclase porphyroblasts from the amphibolite paleozome of the Valle granite, Setesdal in South Norway have been studied in detail petrographically. Each porphyroblast is composed of a mosaic of nearly one thousand plagioclase grains with interstitial quartz and some microline.
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Zoisite-amphibolite with corundum from Tanganyika

Mineralogical Magazine and Journal of the Mineralogical Society, 1954
The most striking rock now described occurs in the Northern Province of Tanganyika Territory, just west of the Great North road, and south of the track from Longido to Engare Naibor. A small group of specimens was collected by Mr. A. G. Clough of Industrial Minerals Ltd., and presented to the British Musemn (Natural History) in 1952 (B.M.
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Amphibolites from the Broken Hill district

Journal of the Geological Society of Australia, 1958
Abstract The amphibolites of the Broken Hill district fall into two distinctive groups. One group, characteristically developed in the Broken Hill Basin, contains common green hornblende and lesser brown hornblende, and in places alman‐dine. These amphibolites are intimately associated with pyroxene‐brown horn‐blende‐bytownite granulites, in which ...
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Garnetiferous striped amphibolites from Connemara, Western Ireland

Mineralogical Magazine, 1972
Summary The chemical factors controlling the rare appearance of garnet in Connemara amphibolites are elucidated, including the importance of low oxidation
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