Clay mineralogy of the pleistocene soil horizon in Barind Tract, Bangladesh

Various areas of Barind Tract in the northwestern part of Bangladesh exposed the Pleistocene of the Pleistocene. X-ray diffraction of 27 samples from different depths of these soil layers showed that the field of soil consisted of kaolinite, illite and chrysotile and contained a significant amount of opal CT. Samples of Maddhapara, Bogra, and Nachole include kaolinite, illite, quartz, and opal - CT, and samples of Kantabari contain chrysotile instead of kaolinite.

Clay mineral composition of different soil layers shows a combination of two different types of clays. (A) Ilit Taurang Stone and (b) Illite - Chrysotile. In the village of Cantaballi, the combination of Illite - Warmstone - clay mineral shows that the soil horizon is formed under low temperature and alkaline and reducing conditions. However, other soil layers of the illite-kaolinite clay mineral combination show that the soil can be formed under wet, mild and underground conditions. These two horizons are formed by different parent materials under different geochemical, topographical and climatic conditions.

Scanning electron micrographs show the presence of glass fragments using XRD and show that there is no opal A and that opal A may not be the precursor of opal CT in the red soil layer of the study area There. The presence of this opal CT and the general absence of fossils and pieces of glass indicate that the opal CT in the study area has volcanogenesis and is therefore not of biological origin and fluorescent x-ray data, along with Tobaasch of Toba Caldera, Indonesia Indicating a higher percentage of available silica. About 75,000 BP

The influence of the physical environment on the land use of the village: The physical environment directly affects the village's land use pattern. In the Marda area, Barind's soil is a hard silt clay with reddish shades formed by sesquioxides. Since the organic residue in the soil is highly decomposed, the pH value of acidic soil is lowered to 8 in the Mardabalin river basin. In these Marda areas, the organic carbon content is usually very low, 0.54%, so the total soil fertility is maintained at moderate levels under non-irrigation conditions. Due to the undulating terrain of Barind which promotes considerable drainage, hard, impermeable and viscous Barind soil hardly penetrates and most of the monsoon runoff is caused by the Tangan River and the Punarvava River immediately after the end of the monsoon It accumulates in a large natural invoice or pool of formed valleys. Cover the lowland here

Various areas of Barind Tract in the northwestern part of Bangladesh exposed the Pleistocene of the Pleistocene. X-ray diffraction of 27 samples from different depths of these soil layers showed that the field of soil consisted of kaolinite, illite and chrysotile and contained a significant amount of opal CT. The samples of Maddhapara, Bogra, and Nachole contain kaolinite, illite, quartz, and opal CT, but Kantabari's sample contains chrysotile instead of kaolinite. Clay mineral composition of different soil layers shows a combination of two different types of clays. (A) Ilit Taurang Stone and (b) Illite - Chrysotile. In the village of Cantaballi, the combination of Illite - Warmstone - clay mineral shows that the soil horizon is formed under low temperature and alkaline and reducing conditions. However, other soil layers of the illite-kaolinite clay mineral combination show that the soil can be formed under wet, mild and underground conditions.