Geochemistry | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-01-11

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Geochemistry


00:00:23 1 History
00:01:59 2 Subfields
00:03:00 3 Chemical elements
00:05:02 4 Differentiation and mixing
00:05:54 4.1 Fractionation
00:08:01 4.1.1 Equilibrium
00:09:00 4.1.2 Kinetic
00:09:53 5 Cycles
00:11:15 6 Abundance of elements
00:12:01 6.1 Solar System
00:12:33 6.2 Meteorites
00:12:43 6.3 Giant planets
00:12:54 6.4 Terrestrial planets
00:13:52 7 Earth's crust
00:14:01 7.1 Mineral constitution
00:14:50 7.2 Felsic, intermediate and mafic igneous rocks
00:14:59 8 Trace metals in the ocean
00:18:19 9 See also
00:18:28 10 References
00:21:19 11 Further reading
00:23:29 12 External links
00:23:38 Except in acid or siliceous igneous rocks containing greater than 66% of silica, known as felsic rocks, quartz is not abundant in igneous rocks. In basic rocks (containing 20% of silica or less) it is rare  for them to contain as much silicon, these are referred to as mafic rocks. If magnesium and iron are above average while silica is low, olivine may be expected; where silica is present in greater quantity over ferro-magnesian minerals, such as augite, hornblende, enstatite or biotite, occur rather than olivine. Unless potash is high and silica relatively low, leucite will not be present, for leucite does not occur with free quartz. Nepheline, likewise, is usually found in rocks with much soda and comparatively little silica. With high alkalis, soda-bearing pyroxenes and amphiboles may be present. The lower the percentage of silica and alkali's, the greater is the prevalence of plagioclase feldspar as contracted with soda or potash feldspar.Earth's crust is composed of 90% silicate minerals and their abundance in the Earth is as follows: plagioclase feldspar (39%), alkali feldspar (12%), quartz (12%), pyroxene (11%), amphiboles (5%), micas (5%), clay minerals (5%); the remaining silicate minerals make up another 3% of Earth's crust.  Only 8% of the Earth is composed of non-silicate minerals such as carbonates, oxides, and sulfides.The other determining factor, namely the physical conditions attending consolidation, plays on the whole a smaller part, yet is by no means negligible. Certain minerals are practically confined to deep-seated intrusive rocks, e.g., microcline, muscovite, diallage. Leucite is very rare in plutonic masses; many minerals have special peculiarities in microscopic character according to whether they crystallized in depth or near the surface, e.g., hypersthene, orthoclase, quartz. There are some curious instances of rocks having the same chemical composition, but consisting of entirely different minerals, e.g., the hornblendite of Gran, in Norway, which contains only hornblende, has the same composition as some of the camptonites of the same locality that contain feldspar and hornblende of a different variety. In this connection we may repeat what has been said above about the corrosion of porphyritic minerals in igneous rocks. In rhyolites and trachytes, early crystals of hornblende and biotite may be found in great numbers partially converted into augite and magnetite. Hornblende and biotite were stable under the pressures and other conditions below the surface, but unstable at higher levels. In the ground-mass of these rocks, augite is almost universally present. But the plutonic representatives of the same magma, granite and syenite contain biotite and hornblende far more commonly than augite.
00:26:05 Felsic, intermediate and mafic igneous rocks
00:29:02 Trace metals in the ocean



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SUMMARY
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Geochemistry is the science that uses the tools and principles of chemistry to explain the mechanisms behind major geological systems such as the Earth's crust and its oceans. The realm of geochemistry extends beyond the Earth, encompassing the entire Solar System, and has made ...