Corroded quartz grains present in sedimentary ores of iron and manganese are evidence of high pH. Other things being equal, the activity of iron and manganese necessary to cause precipitation is lower if precipitation occurs at a higher pH. Under conditions of high pH, it is possible that deposition of iron and/or manganese may have occurred from waters only ten times richer in these constituents than average near-surface sea water.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page of Corroded quartz grains in sedimentary ores of iron and manganese
You do not have access to this content, please speak to your institutional administrator if you feel you should have access.