gneiss: A high-grade metamorphic rock with a banded or foliated appearance, typically composed of alternating darker and lighter colored layers. marble: A metamorphic rock resulting from the recrystallization of limestone, valued for its us...
Ronov and Yaroshevsky (1969) argued that metamorphic rocks (gneiss and schists) contain 107 GT of carbon and 108 GT of water, representing respectively 25% and 40% of the total volume contained in the con- tinental crust. The existence of such a significant amount of carbon stored in ...
We have investigated Four-Mile gneiss (a strongly layered gneiss with well defined lineation), a biotite-rich schist, and Westerly granite (using a block oriented with respect to the granite's rift, grain, and hardway). Progress has been made in three areas: the experimental determination of...
Sample STB971001 represents an Archaean paragneiss, near the Jårkastakka mountain about 70 km NE of Kiruna (Fig. 2). West of Karesuando (Fig. 1), early Proterozoic ultramafic–mafic intrusions occur within the Archaean bedrock. Tentatively, they can be correlated with similar 2.44 Ga rocks...
Foliated Metamorphic Rocks:These rocks exhibit a layered or banded appearance due to the alignment of minerals under pressure.Examplesinclude slate, schist, and gneiss. Non-Foliated Metamorphic Rocks:These rocks lack a layered texture and have a more uniform structure. Commonexamplesinclude marble, ...
The GBT passes from north to south through three large crystalline rock formations: the Aar massif, the Gotthard massif and the Pennine gneiss zone. With the exception of local, geologically disturbed zones, these formations consist of competent gneisses and granites. Thus, the construction of the...
Subsequently, we used a linear regression between the distance of the end of each sector i to the transect starting point and δHRVC,i to determine the energy line per transect. This allows us to determine the energy line angle (ELAregr) and the initial fall height FHregr corresponding to ...
We explore the suitabilty of infrared thermography (IRT) to develop a quantitative, physics-based approach to predict rock fracturing starting from laboratory scales and conditions. To this aim, we performed an experimental study on the cooling behaviour of pre-fractured gneiss and mica schist ...
(Fig.3a,c). Starting from the ~3-meters position, the Li content gradually increases outwards (Fig.3a), while the δ7Li generally remains unchanged (+0.5‰ to +2.0‰; Fig.3c). The Li contents of the No. 308 pegmatite fluctuate greatly (455 ppm to 19385 ppm), while the δ7...
The Theodul-Glacier-Unit (TGU) is a 100 m thick and 2 km long slab of pre-Alpine schist, gneiss and mafic rocks tectonically emplaced in the eclogite-facies Zermatt-Saas meta-ophiolite nappe (ZSU). The meta-sedimentary rocks occur mostly as garnet-phengite schists with locally cm-sized ...