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Gneiss with large eye-shaped feldspars. Augen (from German "eyes") are large, lenticular eye-shaped mineral grains or mineral aggregates visible in some foliated metamorphic rocks. In cross section they have the shape of an eye. [1] Feldspar, quartz, and garnet are common minerals which form augen. [2]
Augen gneiss, from the German: Augen, meaning "eyes", is a gneiss resulting from metamorphism of granite, which contains characteristic elliptic or lenticular shear-bound grains (porphyroclasts), normally feldspar, surrounded by finer grained material. The finer grained material deforms around the more resistant feldspar grains to produce this ...
In some of the Blue Ridge Mountains occurrences, an epidotized augen gneiss is present exhibiting foliation structures. The dominant green epidote in unakite rocks is the metasomatic alteration product of plagioclase feldspar, while the orthoclase and quartz crystals remain unaffected.
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The streaked-augen gneiss member consists of uniform, medium-grained biotite-microcline-quartz-plagioclase gneiss, with augen that have a "stretched" or "streaked" appearance. [1] The hornblende gneiss member is similar to the layered gneiss member, but with hornblende-bearing dark gneiss accounting for about half of the outcrop area. [1]
The main layers of the LHS includes non-fossiliferous, low-grade, metasedimentary rocks, metavolcanic strata and augen gneiss. These have been dated as an age ranging from 1870 Ma to 520 Ma (i.e. Proterozoic to Cambrian).
The gneiss of the Higher Himalayan zone (HHZ) is a thick continuous sequence of about 5 to 15 km. [23] The northern part is marked by the North Himalayan Normal Fault (NHNF), which is also known as the South Tibetan Detachment system (STDS). At its base, it is bounded by the MCT.
Ninety-four million people across the northern U.S. from the Plains to the Great Lakes as well as the Northeast were under winter weather alerts Saturday night, as a fast-moving storm threatened ...