Quiz 3 Flashcards
Detrital sedimentary
Made mostly of rock fragments, quartz gains, clay, or feldspars ex.Breccia,Mudstone or shale,Conglomerate,Arkose
Bioclastic sedimentary
Made mostly of grains that are fragments or shells of organisms ex.Peat,Coal
Chemical sedimentary
Made mostly of precipitate from aqueous solution or chemical residues ex.Rock salt, iron stone,chert, limestone
The 6 sorting sizes of sedimentary rocks
1)Gravel
2)Sand
3)Silt
4)Clay
5)Microcrystaline
6)Crystalline
Breccia
Grain size = 2 cm or greater and Clasts are angular
Conglomerate
Grain size = 2 cm or greater and Clasts are rounded
Arkose Sandstone
dominantly composed of
feldspar
Lithic Sandstone
Dominantly composed of
lithic/rock fragments
Slaty cleavage
Flat foliation developed along flat parallel closely spaced planes
Phylite texture
A wavy or wrinkled foliation of fine grained platy minerals like mica giving a metallic luster
Schisosity
mode of foliation that occurs in certain metamorphic rocks as a consequence of the parallel alignment of platy and lath-shaped mineral constituents.
Gnessic banding
alternating light and dark bands on gneiss are called gneissic banding. These bands are created by foliation when extreme pressure aligns the platy and elongated crystals from the parent rocks.
Nonfoliated metamorphic rock
Have no obvious layering although they may exhibit sketched fossils or long prismatic crystals
Crystalline texture
A medium to coarse grained aggregate of intergrown usually equal sized visible crystals ex.marble
Microcrystaline texture
Finegrained aggregate of intergrown microscopic crystals ex. hornfel
Sandy texture
A medium to fine grained texture aggregate of fused sand sized grains that resemble sandstone ex.quartzite
Glassy texture
a homogenous texture with no visable grains or other surfaces that break along glossy surfaces and resemble glass ex.anthracite coal
Porphyroblastic texture
An arrangement of large crystals set in a finer grained ground mass and is analogous to porphyritic texture in igneous rock
Foliations patterns from high pressure and high temp to low pressure and low temp
1)Gneiss
2)Schist
3)Phyllite
4)Slate
Regional metamoprhisim
a large area is affected by changes in temperature and/or pressure. One type of regional metamorphism occurs at convergent plate boundaries, where rocks are subjected to a variety of pressures and temperatures, resulting in a thermodynamic metamorphism
Contact metamorphism
he type of metamorphism attributed to increased temperature, usually from proximity to a heat source such as an intrusive magma body or a lava flow, and the rock undergoes a thermal metamorphism.
hydrothermal metamorphism
Rocks that are in contact with hot, chemically reactive fluids can also fall within the contact metamorphism category; recrystallization due to this type of contact
