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What is the main characteristic of gneisses?
What is the main characteristic of gneisses?
- Gneisses have a smooth texture.
- Gneisses have a glassy appearance.
- Gneisses are characterized by gneissic layering. (correct)
- Gneisses are soft and easily crumble.
Which type of minerals are responsible for the alternating light-colored bands in gneisses?
Which type of minerals are responsible for the alternating light-colored bands in gneisses?
- Garnet and sillimanite
- Magnetite and hematite
- Biotite and amphibole
- Quartz and feldspar (correct)
What can rigid feldspar grains sheared into oval eye-shaped crystals produce in gneisses?
What can rigid feldspar grains sheared into oval eye-shaped crystals produce in gneisses?
- Augen gneiss (correct)
- Sillimanite
- Corundum
- Cordierite
What is the term for lens-shaped grains that quartz grains in gneisses can be sheared into?
What is the term for lens-shaped grains that quartz grains in gneisses can be sheared into?
What are orthogneisses and paragneisses determined by?
What are orthogneisses and paragneisses determined by?
Which type of protolith can result in gneisses referred to as granite gneiss?
Which type of protolith can result in gneisses referred to as granite gneiss?
What is the main reason behind the development of gneissic foliations?
What is the main reason behind the development of gneissic foliations?
In gneissic banding, which type of minerals are typically concentrated in fold limbs?
In gneissic banding, which type of minerals are typically concentrated in fold limbs?
What process results in the production of igneous layers enriched in quartz and feldspar between refractory layers enriched in dark-colored ferromagnesian minerals?
What process results in the production of igneous layers enriched in quartz and feldspar between refractory layers enriched in dark-colored ferromagnesian minerals?
Which type of minerals have higher melting temperatures compared to quartzofeldspathic minerals according to the text?
Which type of minerals have higher melting temperatures compared to quartzofeldspathic minerals according to the text?
What role does layer transposition play in the development of gneissic banding?
What role does layer transposition play in the development of gneissic banding?
Which process is responsible for the development of gneissic foliations by creating alternating light and dark color bands?
Which process is responsible for the development of gneissic foliations by creating alternating light and dark color bands?
What does a 'lit par lit intrusion' refer to?
What does a 'lit par lit intrusion' refer to?
What characteristic makes gneisses unsuitable for easy splitting?
What characteristic makes gneisses unsuitable for easy splitting?
At what temperature range do gneisses typically form in dynamothermal settings?
At what temperature range do gneisses typically form in dynamothermal settings?
Which type of rocks possess both igneous and metamorphic characteristics?
Which type of rocks possess both igneous and metamorphic characteristics?
What is a distinguishing feature of migmatites compared to gneisses?
What is a distinguishing feature of migmatites compared to gneisses?
At what temperature can extensive melting of gneiss lead to the formation of migmatites?
At what temperature can extensive melting of gneiss lead to the formation of migmatites?
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