TEMAnc DESCRIPTIONS Soe oxiDES HYORox Evaporite Minerals of Naca. and fort (08 m
ID: 284670 • Letter: T
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TEMAnc DESCRIPTIONS Soe oxiDES HYORox Evaporite Minerals of Naca. and fort (08 m) of K. column of 15 ASmithick. The photograph shows the fine Idarker bands in the photographi al ternating with gypsum flighter bandsl in the upper Permian casello of West Texas and New Mexico seasonal changes temperature and/or ionic concen- wation evaporating body of temperat Mwhen he original eral precipitation, and each couplet a varva. but the anefne of the eriginall, which tation resulting from evaporation RY, W. E. Dean, Jr. D W. Kirkland and H Snider, 1972, Permian Cantile varved avaporte sequence Geological Society of consumed would form os feet is m of eal America amoure used to psverledeniuli. hamas, India, Brail, Pnd Spain, te- posits of the more ch as sylvite, camallen from brine may also low Finely varved oua specimen l 1. The Louann Salt, which underlies a large portion of Louisiana, is a massive evaporite deposit that precipitated when the Gulf of Mexico began to open in the Middle Jurassic. It is currently highly variable in thickness, however, immediately post-deposition, it is thought to have been nearly 5000 feet thick. a. Using the information on p.394 in your textbook calculate the thickness of a column of seawater that would be required to produce 4.000 feet of halite. Show your work. b Is this thickness reasonable? If no, explain your answer to part (al c How much Caso, would result?Explanation / Answer
a. It is mentioned that 1000 ft of sea water can produce 11.8 ft thick layer of Halite. thus for 4000 ft of halite, it is required the thickness of sea water upto
= 1000*4000/11.8 = 338983.05 ft
b. This thickeness is not reasonable since the concentration of halite is not constant and doenot follow a direct relationship as a whole. The residence time also plays a factor role in this process.
c. CaSO4 would form 0.5 ft for 1000 ft of sea water.
thus for 4000 ft thickness
= 1000*4000/0.5
= 8000000 ft of sea water required. not feasible
For halite formation of
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