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Gold/Mining/Energy : ECHARTERS -- Ignore unavailable to you. Want to Upgrade?

To: Big Shorty who wrote (1973)	12/9/1997 3:26:00 AM
From: Bill Jackson	Respond to of 3744

jimc; I am referring to bedrock halos. The overburden accumulates trace elements upwards from the bedrock that are soluble in reducing environments, and they bind at the B horizon. By sampling the B horizon you get a trace element snapshot of the bedrock via the mobile elements. The problem is that ground water can move and disturb the plume. However if the ground water flux is high enough there is a chance that it is no longer reducing and those elements are not mobile as well. In bedrock the mobility happened eons ago while the melt was hot and the assorted enhancement and depletion gradients formed. The best samples are indeed from the bedrock, sufficiently within the rock to avoid surface leaching over the past 2+ billion years. From such samples you can indeed track gradients over greater distances than with the B horizon stuff, and with a great deal more work and expense than the relatively low cost B horizon stuff. Bill