Talk:Evaporite
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Removed the following pending a source:
- Salt rocks also form by replacement of carbonate rocks by salts. A new theory of salt deposition is related to deep origin where supercritical water loss molecular polarity and capacity of dissolution of salts and then salt from brines are deposited by hydrothermal processes in deep water, mainly in rift systems. Salt rocks is frequently associated with volcanism.
Provide a reference and it can be cleaned up and re-inserted. Vsmith 02:23, 6 November 2006 (UTC)
[edit] Many solutes, one mineral?
Hi, can anyone describe how/why it is that while salt water contains many dissolved minerals, the evaporite rocks formed seem to be nearly pure beds of one substance or another? Why do evaporite minerals not match the chemical proportions of evaporated sea salt or salt water? thanks for any info you can provide. 68.121.165.9 20:15, 13 May 2007 (UTC)
- I'm not an expert, but I would think each mineral would precipitate out at a specific concentration point, which (I think) would be different for each mineral. So some might precipitate out in one area as the water evaporates and leaves that area, and another mineral that tolerates a higher concentration before precipitating would be left in a different area, etc. or paerhaps they simply precipitate in layers. The key is that different minerals will have different properties of some sort that cause them to fall out of solution together, creating pure beds of each mineral as opposed to a mix.
- This is just my guess. Hope it helps. --DanielCD 21:44, 13 May 2007 (UTC)
[edit] "New theory"
Removed the following:
- A new theory, in development by a research group headed by Martin Hovland called "Hydrothermal salt theory", of salt formation was proposed recently. Salt originally is related to volcanic environments and hydrothermal processes involving supercritical water (loss polarity of water molecule) that can not dissolve salts and carrying out salt forming stocks. It's interesting to note that halogens such as chlorine, bromine, iodine pratically do not occur as rock forming minerals in earth surface. Then is plausible that salt origin comes from depths. Good examples are salt forming in rift zones (Red Sea, African Rift), transform zones (Dead Sea, Salton Sea), Salar Uyuni (Bolivia).
It is based on recently published material in Oil & Gas Journal, January 15, 2007 [1]. Wikipedia doensn't need to embrace such new theories quite so fast - wait a bit for some verification and testing, questioning by professionals in the field. The earlier addition of this material was sourced to Martin Hovland's website and this appears to be someone promoting his work prematurely. In addition some of the material added is simply wrong and poorly worded. For example, the halogens fluorine and chlorine do occur in surface and near surface rock forming minerals. Vsmith (talk) 03:29, 27 November 2007 (UTC)
