Gneiss - Wikipedia
In traditional English and North American usage, a gneiss is a coarse-grained metamorphic rock showing compositional banding (gneissic banding) but poorly developed schistosity and indistinct cleavage.
Gneiss - Geology is the Way
Gneiss is a medium- to high-grade foliated metamorphic rock displaying a coarse-grained banding (also known as gneissose structure). ‘Gneiss’ derives, indeed from the German gneist, ‘spark’, likely a reference to the presence of large grains that reflect light.
Gneiss | Metamorphic, Foliated & Banded | Britannica
gneiss, metamorphic rock that has a distinct banding, which is apparent in hand specimen or on a microscopic scale. Gneiss usually is distinguished from schist by its foliation and schistosity; gneiss displays a well-developed foliation and a poorly developed schistosity and cleavage.
Gneiss: characteristics, formation, uses - ZME Science
2024年1月8日 · Gneiss (pronounced mostly like “nice”) is a fascinating and widely distributed type of high grade metamorphic rock. This type of rock has a number of distinguishing features that make it a staple...
Gneiss Domes in Orogeny - GeoScienceWorld
2004年1月1日 · Gneiss domes are ubiquitous structures in all exhumed orogens, and their formation represents a first order thermal-tectonic process that has operated from the Archean to the present.
Gneissosity - compositional layering in which granoblastic layers of roughly equidimensional grains (e.g. quartz, feldspar) alternate with more schistose layers of platy or elongate grains, or with other granoblastic layers.
linear fabrics (they are short chapters). The preservation of earlier generations of fabrics within porphyroblasts (eg. garnet) and within low strain zones (the hinges of later folds) is exploited by geolog.
Gneiss - SpringerLink
The most common use of the term “gneiss” is for a medium-coarse grained, generally equigranular, metamorphic rock, with a poorly-defined planar anisotropy or gneissosity indicated by alternating felsic and mafic layers (Fig. 1).
Examining the tectono-stratigraphic architecture, structural …
2019年4月25日 · In the hanging wall of the Main Central thrust, schistosity and gneissosity are the primary foliation types, and they are generally parallel to the axial planes of the small-scale mesoscopic folds. The foliations dip 55–75°N. Small-scale …
We show that the formation of hydrothermal graphite and pyrite in shear zones is a late tectonic feature in the sequential assembly of Nuna from NW (older) to SE (younger) and involved graphitic ...