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Definitions (34)
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plate tectonic terms a-d
A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | WXYZ Abyssal Sediments Deep ocean-bottom fine grained sediments beyond the direct influence of the land. [Diag o [..]
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accretionary wedge
Pile of sediments, characterized by repeated thrust faults, which accumulates on the oceanward side of a subduction zone. It grows due to sediment being scraped off the descending plate at a subductio [..]
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alkali basalt
Basalt containing normative nepheline and olivine.
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amphibolite
Metamorphic rock consisting mainly of amphibole and plagioclase with little or no quartz.
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andesite
A fine grained intermediate volcanic igneous rock characterised by the presence of oligoclase or andesine. Their chemistry and mineralogy are closely similar to those of the diorites. Porphyritic vari [..]
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archean
The earlier part of the Precambrian between 4000Ma and 2500Ma.
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asthenosphere
Partially molten layer below the lithosphere that is marked by low seismic wave velocities and high seimic attenuation.
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back arc basin
Basin located on the over-riding plate behind the volcanic island arc at a subduction zone.
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basalt
Fine grained, dark, mafic igneous rock composed largely of plagioclase feldspar and pyroxene.
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blue schist
A low temperature, high pressure regionally metamorphosed rock containing abundant glaucophane.
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