Geochemical data. All electromagnetic waves travel at the speed of light (3 x 10 8 ms -1 ) and are...
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Transcript of Geochemical data. All electromagnetic waves travel at the speed of light (3 x 10 8 ms -1 ) and are...
![Page 1: Geochemical data. All electromagnetic waves travel at the speed of light (3 x 10 8 ms -1 ) and are discussed in terms of wavelength and frequency The.](https://reader034.fdocuments.in/reader034/viewer/2022051517/56649ebe5503460f94bc8768/html5/thumbnails/1.jpg)
Geochemical dataGeochemical data
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All electromagnetic waves travel at the speed of light (3 x 108 ms-1) and are discussed in terms of wavelength and frequency
The electromagnetic spectrum
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Spectrometry
Energy Source AbsorptionDetectorSample
EmissionDetector
Output withabsorption trough
Output withemission peak
Absorbedradiation
Emittedradiation
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The K emission spectrum of copper
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X-ray spectrum of an olivine
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Composition of Earth shellsElements wt%
Crust Mantle Core
Continental Oceanic Upper Lower Outer Inner
O 41.2 43.7 44.7 43.710--15
Si 28 22 21.1 22.5
Al 14.3 7.5 1.9 1.6
Fe 4.7 8.5 5.6 9.8 80--85 80
Ca 3.9 7.1 1.4 1.7
K 2.3 0.33 0.08 0.11
Na 2.2 1.6 0.15 0.84
Mg 1.9 7.6 24.7 18.8
Ti 0.4 1.1 0.12 0.08
C 0.3
H 0.2
Mn 0.07 0.15 0.07 0.33
Ni 5 20
Cr 0.51
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Nucleosynthesis
« Bethe’s cycle »
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Elements stability
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Elements abundance
• Lights > Heavies
• Even > Odd
• Abundance peak close to Fe (n=56)
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Solar system abundance
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Formation of a planetary nebula-
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Planetary nebulas
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Temperature gradients in the planetary nebula
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Differenciation of planets
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