Minnesota Clay Torrent High Quality





             

Minnesota Clay Torrent


the paddy soils used in this study were developed from a combination of two parent materials: calcareous marine sediment and quaternary red clay. the calcareous paddy soils with earlier soil development stage represented a situation during the last glacial maximum, whereas those with later soil development stage represented a situation during the deglaciation. the m profiles in the two paddy soil chronosequences increased rapidly with depth, reflecting the decrease in the cation exchange capacity (cec) with time (fig. 3 ). the increase in the m profiles with soil depth in the two paddy soil chronosequences was stronger than that recorded in the loess-paleosol sequences of china, where the m profile increased slowly with soil depth for most of the loess profile, only showing a significant decrease in the overland flow to the loess horizon at later times in evolution of the loess-paleosol sequence.

the net result was that the soil ph was lower in the catchment upstream of the two houses than in the unaltered catchment. in the downstream half of the study catchment, the soil ph was initially higher in the flooded catchment, although it declined in the floodwater after 6 y. this was attributed to leaching of surface waters and base cation losses. catchment ph was strongly correlated with soil ph, suggesting that both acidity and base cation availability are important drivers of soil ph and water chemistry in floodplain paddy soil.
the flooding regime caused a decrease in soil magnetic susceptibility. this indicated a relatively increase in the degree of clayspalinisation. however, the flooding period caused a loss of soil iron reduction. this could be related to the decrease of soil ph which resulted in an increase of ferrous (fe 2+) iron and the dissolution of iron rich organic matter in the soil which caused the increase of fe 2+ and the decrease of soil ferric iron (flores et al., 1997).
over the 26 y studied period, the amount of fe 2+ increased, while the amount of fe 3+ decreased in the surface soil, while the amounts of fe 2+ and fe 3+ in the subsoil remained constant. this indicated that the surface soil could become acidified due to the leaching of base cation, which causes the increase of ferrous iron, while that of ferric iron decreases significantly; as a result, soil ph decreases, which, in turn, results in the production of magnetic minerals which are relatively easy to reduce in ph<7 (borman et al., 2001).




the long-term effects of mining on the chemical, physical and biological composition of rock and ore minerals are documented in numerous publications and in a vast number of books and other printed works. this section is intended to point out a few areas where effective collaboration is needed between educators, teachers, and researchers in the field of geochemistry to provide the future geochemistry students with information that will enhance their understanding and use of the chemistry of geology. most of the clay that is found in minnesota can be traced back to two primary sources. one is the deliquefied progenitors of our precambrian forefathers. they were the sponges that first flourished upon the sea floor of an ancient ocean. the clay found in these sponges is called “spongy clay.” the second source is from the ancient rocks in the center of the planet. these are the rocks that were directly or indirectly formed at the center of the planet while it was still hot. these rocks are called “spontaneous clays.” regardless of the long history, it is rare to find clays on the surface of the earth. on the continents, the surface is often hard rock such as granite or basalt. but those places where you do find clays are almost always in a place where it rains at some point. that places those clays tend to be found. you might look down at your feet on a weekend morning and see a little piece of clay in your shoe. you might see it next to a road. you might see it down under a hill in a creek or in the middle of a field of prairie grass. if you think about that for a few minutes and then think about the fact that you are on the planet, that piece of clay, which is made mostly of silica (sio2), is probably the only thing that is made of silica (sio2) on the planet at that moment. 5ec8ef588b


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