Analysis of intrusive rock microstructures can provide information on source and genesis, including contamination of igneous rocks by wall rocks and identifying crystals which may have been accumulated or dropped out of the melt.
42.
Aplite and veins may intrude pegmatites and wall rocks adjacent to intrusions, creating a confused sequence of felsic intrusive apophyses ( thin branches or offshoots of igneous bodies ) within the aureole of some granites.
43.
KROQ-FM ( 106.7 ) afternoon host Jed ( the Fish ) Gould added the tag line when the original feed from the weather service was of quality too poor to broadcast at the off-the-wall rock station.
44.
Rocks there do not deform so easily : for magma to rise as a pluton it would expend far too much energy in heating wall rocks, thus cooling and solidifying before reaching higher levels within the crust.
45.
Its low rim is composed of loose pieces of basaltic lava and wall rocks ( sandstone, shale, limestone ) of the underlying diatreme, as well as random chunks of ancient crystalline rocks blasted upward from great depths.
46.
KROQ-FM ( 106 . 7 ) afternoon host Jed ( the Fish ) Gould added the tag line when the original feed from the weather service was of quality too poor to broadcast at the off-the-wall rock station.
47.
Maar volcanoes are typical of small basalt tuffs, formed by explosive eruption of basalt through the crust, forming an apron of mixed basalt and wall rock breccia and a fan of basalt tuff further out from the volcano.
48.
The pit and its water present a serious environmental problem because the water, with dissolved oxygen, allows pyrite and sulfide minerals in the ore and wall rocks to decay, releasing Cu ) that some material is mined directly from the water.
49.
In brittle shear zones, the deformation is concentrated in a narrow fracture surface separating the wall rocks, whereas in a ductile shear zone the deformation is spread out through a wider zone, the deformation state varying continuously from wall to wall.
50.
This recognition was tied to two events : ( 1 ) the observation of magnetic anomaly stripes on the seafloor, parallel to intrusion of magma, resulting in a formation consisting of 100 % dikes with no older wall rocks preserved within the complex.
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