making and preparing laser mounts for Friday (V and ols)
Sm -> Nd
La -> Hf
Rb -> Sr
Bulk silicate Earth
Calorimetry
Chinese harvest festival
Homework
Rangers at Devils
26.9.10
11.9.10
10.9.10
back to the classroom
C.G. - math review, differential equations
C.G. - thermodynamics intro, zeroth law (no perpetual motion), 1/2 law (if you squish something it gets small)
I.G, intro to standard eqn w/ 87Rb->87Sr
87Sr = 87Sr(intial) + 87Sr * (e^(lt)-1)
86Sr = 86Sr(intial) + 86Sr * e^(-lt)
used to determine age of solar system and last geologic activity on Mars
I.C. resonance, Lewis structures, bond angles, electronegativity, electron affinity
C.G. - thermodynamics intro, zeroth law (no perpetual motion), 1/2 law (if you squish something it gets small)
I.G, intro to standard eqn w/ 87Rb->87Sr
87Sr = 87Sr(intial) + 87Sr * (e^(lt)-1)
86Sr = 86Sr(intial) + 86Sr * e^(-lt)
used to determine age of solar system and last geologic activity on Mars
I.C. resonance, Lewis structures, bond angles, electronegativity, electron affinity
19.8.10
30.7.10
RF SONNE
My floating home in the Pacific for two weeks off the coast of Coasta Rica and Nicaragua. Looking at pillow basalts and volcanoclastics from seamounts.
20.6.10
21.5.10
meeting here
red blobs, blue blobs, low velocity anomaly, high velocity anomaly, water, degree of melting, pressure, temperature
20.5.10
16.4.10
11.4.10
31.3.10
18.3.10
22.2.10
19.1.10
Magnetite (spinel specie)
The spinel species magnetite (Fe3O4) is found in a huge range of different rock types. The equilibrium between quartz, olivine, and magnetite is used as a reference to specify a commonly-occuring oxygen pressure typical of rocks formed near the Earth's surface. In addition, magnetites in many igneous and metamorphic rocks are titaniferous (containing ulvospinel, Fe2TiO4, in solid solution). Titaniferous magnetites coexisting with ilmenite solid solution are sensitive to both temperature and redox conditions (oxygen fugacity), and in favorable conditions the compositions of both phases can indicate the temperature at which they formed.
from: Mineralogy and Optical Mineralogy (2008) Dyar, M. and Gunther, M.; Mineralogical Society of America.
from: Mineralogy and Optical Mineralogy (2008) Dyar, M. and Gunther, M.; Mineralogical Society of America.
Spinel
Spinel (MgAl2O4) At about 400 km, the olivine structure is no longer stable. It changes spontaneously from the olivine structure to a spinel-type structure, which takes up 8% less space; the composition remains the same (though we now call it beta-Mg2SiO4). This causes seismic discontinuity at about 300-400 km depth that is the boundary tranistion zone.
from: Mineralogy and Optical Mineralogy (2008) Dyar, M. and Gunther, M.; Mineralogical Society of America.
from: Mineralogy and Optical Mineralogy (2008) Dyar, M. and Gunther, M.; Mineralogical Society of America.
Hematite
Hematite(Fe2O3) is a common member of the corundum group and is usually found in sedimentary of metamorphosed sedimentary rocks. When present in metamorphic or igneous rocks, it is indicative of highly oxidizing conditions. The red color of hematite is very intense because the Fe(+3)O6 octahedra are somewhat asymmetric, intensifying the bands in the hematite spectrum.
from: Mineralogy and Optical Mineralogy (2008) Dyar, M. and Gunther, M.; Mineralogical Society of America.
from: Mineralogy and Optical Mineralogy (2008) Dyar, M. and Gunther, M.; Mineralogical Society of America.
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