Annotated Bibliography Week #11





Annotated Bibliography #1


Reatto, A., Bruand, A., Silva, E. M., Guegan, R., Cousin, I., Brossard, M., & Martins,  
E.S. (2009).  Shrinkage of microaggregates in Brazilian Latosols during drying: significance of the clay content, mineralogy and hydric stress history. European Journal of Soil Science, 60(6), 1106-1116.  https://doi.org/10.1111/j.1365-2389.2009.01189.x

This study looked at Latosol’s, which is soil under tropical rainforests.  It contains high amounts of iron and aluminum.  The soil itself is characterized by poor soil differentiation, strong microgranular structure mainly formed with microaggregates, and poor shrinkage properties.  They focused their study on the shrinkage properties and water retention.  The pore volume was closely associated with the clay content.  They found less shrinkage in the microaggregates in certain areas.  They attributed the shrinkage to their different amounts of water stress.



Annotated Bibliography #2


Hosterman, J. W., & Whitlow, S.I. (1983).  Clay minerology of Devonian shales in the
Appalachian Basin.  United Sates Department of the Interior, Geological Survey.


This study looked at the clay mineralogy of black shale that is from the Devonian era in the Appalachian basin.   Illite, Chlorite, Ulite-smectite, and Kaolinite were studied in older and younger shale samples.  Calcite was found only in the oldest samples.  Kaolinite was found to be most abundant near the shoreline.  Having just studied the plate collision forming the Appalachians, I wonder if there is a correlation between the Kaolinite found and the plate boundaries.   




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