1. The temp of earth increases ~25 degrees C with every kilometer in depth near
ID: 286179 • Letter: 1
Question
1. The temp of earth increases ~25 degrees C with every kilometer in depth near the surface.
A) You have identifies a poorly sorted, fine grained dike in an outcropbeside a road cutout. The mineralogical composition of the dike is quartz, biotite, and sodium rich feldspar. What temp. did it solidify at and how quickly did the sill solidify?
B) You have identified a well sorted, coarse grained sill in an outcrop beside the road cutout. The mineralogical composition of the sill is pyroxene, amphibole and alkali feldspar. What temp. did it solidify at and how quickly did the sill solidify?
Surface 400 km 670 km 1000 Solidus Vantle Solid 2000- E 3000 Temperature 2. Velt 4000 Outer Core 5000 inner Core 6000 0 1000 2000 3000 400C 5000 Temperature C)Explanation / Answer
A)
the temperatures of felsic magmas which contains Feldspar, quartz and biotite ranges from 650-800 degree celcius, since the dyke is fine grained we can say that it cooled rapidly and did not allow a proper crystallization.
B)
the temperatures of magma that contains amphibole, pyroxenes ranges from 1000-1200 degree celcius and since the sill have coarse grain rocks we can say that the cooling of sill was slow and steady which gave ample amount of time to minerals to crystallize
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