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#21 |
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Senior Member
Join Date: Nov 2010
Posts: 161
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Whenever chemical elements (atoms) are brought together there is a tendency for them to react with each other and to form compounds. When the Earth and other planets accreted (That means formed/made/created) around 4.5-4.6 billion years ago, they contained a mixture of all the elements, and the relative abundances probably reflected the cosmic abundances indicated by spectroscopic studies. There are more than 3000 known minerals (the number is still growing), but of these only about 20 are very common, and only 9 of these constitute 95% of the crust. These 9 minerals are all silicates, and are also called the rock forming minerals. They can be subdivided into two groups, the mafic and felsic minerals. MAFIC BIOTITE (mica) AMPHIBOLE/HORNBLENDE PYROXENES/AUGITE OLIVINE Ca-PLAGIOCLASE (feldspar) FELSIC QUARTZ MUSCOVITE (mica) ORTHOCLASE (feldspar) Na-PLAGIOCLASE/ALBITE (feldspar) From these base minerals, you get your three main rock types. IGNEOUS ROCKS - from the core METAMORPHIC ROCKS - rocks which have been altered by pressure/temperature/fluid dilution ect. SEDIMENTARY ROCKS - created from the weathering, erosion, rain, streamflow, wind, wave action, ocean circulation of metamorphic and igneous rocks. Two types of sedimentary rocks. Clastic Sedimentary Rocks are those that are composed of fragments of other rocks (igneous, metamorphic, and sedimentary). Depending on grain size they are subdivided into conglomerate (grain size larger than 2 mm), sandstone (size between 2 mm and 0.0625 mm), and shale (mudstone). Chemical and Organic Sedimentary Rocks are the other main group of sediments besides clastic sediments. They usually form by inorganic or organically mediated mineral precipitation, and as the result of biological activity. (limestones, evaporites) So as to your question, where does gold come from and why does it make gold nodes? Nearly all placer gold (stuff found in rivers), both coarse and fine, originates from the erosion of primary hard rock gold deposits. Its hard to imagine things like gold being dissolved by water solutions, but if the water is hot enough, the pressure high enough, and the chemistry is right then gold, quartz and other things you don’t expect to see dissolving will go into solution. The solutions move by natural convection (hot things rise), and as they rise the waters cool as they move farther from the heat source in the ground and closer to the surface. The gold is combined with sulfur to form gold-sulfur chemicals that dissolve in the water. The important fact is that at heat and temperature, gold will react with sulfur and other elements to form soluble chemicals. These chemical complexes are not all that stable, so that when the waters cool and the pressure drops, the chemicals decompose, releasing the gold to form nuggets. Also as the waters cool, things like quartz and sulfides become less soluble and they come out of solution to form veins. The most common conduits for these solutions are natural fault zones; this is why most veins are shaped like fault zones, a long and narrow plane. This is the process that forms nearly all gold-quartz veins. And if you ask me how gold got into the rocks i am soooooo not going over the geochemistry of gold solutions from igneous and metamorphic rocks. Maybe that doesn't answer your question, but i am sure it will allow others to understand a little better. ![]() (Thanks to: http://www.nuggetshooter.com/article...formation.html) Last edited by nightwolfdreams; 29-11-2011 at 04:18 PM. |
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#22 |
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Senior Member
Join Date: Sep 2010
Posts: 2,150
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Poor move.
Amaralswrong is perfectly aware of the science involved. He just thinks he can prove people wrong on 1 point by moving the goalpost til they eventually reach a point they can't answer, as though that proves point 1 incorrect. A typical Amaralswrong "moving goalposts" thread will look like this: Perp: "Gold deposits build up through volcanic action" Amaralswrong: "What causes Volcanoes?" Perp: "Ultimately gravity" Amaralswrong: "So where did Gold come from?" Perp: "Fusion in Stars" Amaralswrong: "Where do Stars come from? I'm "Honestly" curious...." ( )Perp: "Matter forming into large bodies over time due to gravity" Amaralswrong: "So where did Matter come from?" Perp: "Well, possibly the Big Bang, we're not 100% sure right now." Amaralswrong: "See, you don't even know how Gold builds up! See! I told you so! Look at how clever I am everybody! Look! Look at me! I'M CLEVER!!! LOOK!!!!" He does it all the time. Its very tedious. I don't know if its just about attention or ego-masturbation proving his "superiority" or maybe he's just a bored troll. Who knows?
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#23 | |
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Banned
Join Date: Oct 2009
Location: Varies in quest for more Sooty
Posts: 12,319
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Quote:
How do you get gold and not soup? Now come on guys... you all surely know there is a bootstrapping problem with the formation of planets? Don't you? Last edited by amaralsright; 29-11-2011 at 09:57 PM. |
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#24 |
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Banned
Join Date: Oct 2009
Location: Varies in quest for more Sooty
Posts: 12,319
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#25 | |
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Senior Member
Join Date: Feb 2010
Posts: 1,442
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MORE STANDARD (ASTRONOMICAL) MODEL NONSENSE
December 4, 2011 By Joseph P. Farrell Quote:
pretty much sums up the state of things imo.
__________________
SATYAN NASTI PARO DHARMAH (Check The Meaning) http://www.youtube.com/watch?v=krsa0AYwhdU Last edited by iaintoff; 04-12-2011 at 05:42 PM. |
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#26 |
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Inactive
Join Date: Jan 2010
Posts: 8,274
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