Metamorphic isograds of Uwet area, southeastern Nigeria
The distribution of isograds indicates a northwest to southeast increase in the intensity of metamorphism in the Uwet area from medium greenschist facies to uppermost amphibolite facies. The presence of kyanite and sillimanite indicate high pressure
-high temperature Barrovian-type regional metamorphism whereas the absence of staurolite in these alumina-rich rocks is indicative of the high fugacity of oxygen during the metamorphism of the area.
Geochemistry ; Metamorphic rock ; Metamorphism ; Microstructure ; Mineralogy ; Regional geology ; Rock ; Zimbabwe
This paper focuses on dehydration of hornblende during the retrograde metamorphism to examine the rock-fluid interaction which produced the charnockite-enderbite suites in the Northern Marginal Zone, Zimbabwe, on the basis of available thermodynamic
Late Archean metamorphic Banded Iron-Formations of Bababudans of Karnataka, India
Archaean ; Diagenesis ; Hydrothermal ; India ; Iron ; Karnataka ; Manganese ; Metamorphism ; Mineralization ; Mineralogy
the transformation of the simple precursors through post-depositional changes like diagenesis, metamorphism, hydrothermal and supergene processes without much bulk changes.
Inkohlung als spezifische Form der Metamorphose organischer Substanzen und ihre Bedeutung für die Erdgaslagerforschung. (Coalification as a special form of metamorphism of organic matter and its importance for the natural gas research)
The term coalification summarizes diagenetic as well as metamorphic processes in the period of coal genesis out of organic matter. An attempt is undertaken to use the term catagenesis from the Soviet nomenclature as an independent category between
diagenesis and metamorphism. Different classification of coalification are described. (HL).
Relationships between clay mineralogy, hydrothermal metamorphism, and topography in a Western Cascades watershed, Oregon, USA
Clay mineral ; Hydrothermal ; Metamorphism ; Mineralogy ; Mudflow ; Oregon ; Slope dynamics ; United States of America ; Volcanic rock ; Watershed
This study investigates variation in clay mineralogy and its relation to hydrothermal metamorphism, hillslope processes, and topography in the western Cascade Mountains. The study area is the drainage basin of Dorena Lake, a medium-sized watershed
foliations and effects of progress of contact metamorphic reactions in the contact aureole are shown on the structural map for each of the country rock-types of the Sesia-Lanzo Zone. The structural and metamorphic evolution was reconstructed across the north
-eastern margin of the pluton by separating the pre- and the post-intrusive tectonic history and defining the contact aureole outline. Contact metamorphic assemblages and thermobarometric estimates indicate that this intrusive body emplaced at shallow
structural levels (contact metamorphism peak conditions : T < 750°C; P < 0.2 GPa). - (NF)
The structure of the Palaezoic schists in the Southern Menderes Massif, western Turkey : a new approach to the origin of the Main Menderes Metamorphism and its relation to the Lycian Nappes
In this paper, the AA. discuss the general characteristics of the structures formed during the Main Menderes Metamorphism, discuss the evidence for the sense of shearing, and test the previously proposed model for the origin of the Lycian Nappes
and their relation to the Main Menderes Metamorphism. The study area is located on the southern side of Besparmak Mountain, north of Selimiye in the southern sector of the Menderes Massif.
Analysis of regional data from metamorphic tectonites: derivation of deformation sequences from over printing relations in Recent advances in geomathematics. An international symposium.
Geological map of the province of Nova Scotia. 1: 500000.. ((Insets): Structural map of Nova Scotia. 1: 1000000, metamorphic map of Nova Scotia. 1: 1000000)
and garnet-amphibole schists, locally with megablasts of garnet and amphibole. As the Schneeberg Complex is considered to be a monometamorphic unit with Alpine metamorphism only, its southern boundary with the polymetemorphic Texel Complex is a key-element
in deciphering the tectono-metamorphic evolution of the Austroalpine basement in the western sector of the Eastern Alps. - (NF)