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Posted in response to Re: Re: Re: Re: Picture Jasper Geology from Daniel on January 20, 2012 at 02:36:55:

Re: Re: Re: Re: Re: Picture Jasper Geology

I have researched picture jasper formation in the Owyhee mountains and it seems that it was formed as silicified mud getting its color as described below. Imagine what picture jaspers, Yellowstone will yield. Hope this helps! Tom

Mark Ferns,state geologist, Oregon,stated: "the basic concept for the picture rock localities that I have seen in Oregon is that they are hydrothermal deposits formed at the surface. Fossilized mudpots for the most part. Green and blue color is from very fine-grained, unoxidized sulfides. Red and orange-brown results from oxidation of the sulfides. Many of the deposits are located above the ring-fractures to major calderas."


Check out these references:
Rytuba, J.J. and Vander Meulen, D.B., 1990, Hot-Spring Precious_metal Systems in the Lake Owyhee Volcanic Field, ORegon-Idaho: in Raines, G.L., Lisle, R.E., Schafer, R.W., and Wilkinson, W. H.; eds; Geology and Ore Deposits of the Great Basin; Geological Society of Nevada Symposium Proceedings; p. 1085 - 1096.

Vander Meulen, D. B., Rytuba, J.J., King, H.D., and Plouff, D., 1987, Mineral Resources of the Honeycombs Wilderness Study Area; Malheur County, Oregon: U.S. Geological Survey Bulletin 1741-A, 15 p.

From Tom Munson - February 08, 2012 at 01:16:07
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