| چکیده انگلیسی مقاله |
 The Origin of Yellow Sedimentary Spots in Bayazeh    M. R. Nowjavan. A. R. Arab Ameri  Received: 21 April 2010 / Accepted: 17 February 2011, 27-30 P     M. R. Nowjavan ( * ),  Assistant Professor of Geomorphology, Islamic Azad University âMeybod Branch, Meybod, Iran.      Extended abstract  1- Intro duction  Bayazeh hamlet is located in Isfahan province (55áµ - 55áµ 15Í´ Log and 33áµ - 33áµ 30Í´ Lat) and 459 km away from Isfahan city. This village constructed on the yellow sediments that distinguish the village color from surrounding areas.  The published report in 11th international congress of soil science (Ghayomi, 1388) denoted the loose origin for yellow sediments. At the same time in University of Isfahan, Gorji (1387) was studying the gully of Bayazeh and origin of yellow sedimentary spots in this area which indicated the different results with Ghayomi (1388). Whereas origin of these sediments could be affecting on analysis of climate changes, so research proposal was approved to seek origin of yellow sedimentary spots of Bayazeh.  Sedimentology science is among ordinary methods to analyze sedimentary environments and investigate environmental phenomena such as atmospheric and climate changes.    Analysis of deposits samples especially in the bed of lakes is opens a new analytical valve for researchers. So analysis of sediments origin, Quaternary sediments particularly can be helpful for paleontologists and archeologists about Quaternary events. Sometimes, the significance of this issue is extended, so that sediments can be cited as the climatic evidences.  Looses are such as sediment samples which declared as evidence to analyze climatic changes for Geomorphology and Pale-climatology studies. These sediments are in relation to Quaternary deposits and according to their properties such as agricultural capabilities are meaningful for researchers. Yellow sedimentary spots in Bayazeh located in central playa of Iran were argument issue of tow Pedologist and Geomorphologist researchers. One of them, origin of yellow sedimentary spots reported as Loose in 11th Iran Soil Sciences International Conference and other claimed these sediments belong to the ancient lake that has been discharged in result of rupture and yellow spots in Bayazeh have lake origin and Bayazeh village located on these sediments.  Considering Loose as origin of these sedimentary deposits for this basin as one of dry and arid zone of Iran is very important particularly for studying natural history. Therefore for this purpose a proposal was confirmed.   2- Methodology  To reach these purposes, have been prepared data needed in two categories: Sedimentology and Topography data. Sedimentology data were provided based on the field sampling and laboratory Granulometery. Also according to the international experiences have been applied granulometery indicators such as ratio of kd/cl.  In topography category, based on morphology characteristics of lake and its bed, the elevation data prepared and then origin of forms have been analyzed. These analyses were done based on topography profile alterations in lake section. Also slope scope and surface changes (changes in convexity, concavity and smoothly) were base of analyses.   3- Discussion  Topography investigations based on slope, surface forms and elevation changes indicated that slope scope of Bayazeh sediments is about 2.5%, while this slope decreased to 0.7 % in range of yellow deposits. On the other hand, the domain level that has a concave surface area upon arrival to yellow sediments range of Bayazeh changes from concave to smooth surface and also its texture changes from Marn to lie. Relief investigations implies on mining marginal hilly area of yellow sediments in Bayazeh.  Laboratory studies and calculating Tras, Hazen, Kofdi clasman indices and ratio kd/cl, also lime amount, Carbon and Ec indicated that sediments are like as lake deposits. The difference between wind deposits and loose is significant.   4- Conclusion  The main goal of this research was determination of yellow sedimentary spots origin. So using morphometric comparison method on the one hand and topography analysis of sediment in other hand have been determined origin of sediments.  Loose sediments of Boshgan have been considered as evidence and comparison sample and all of morphometric indices and chemical indicators (granulometery, Terax index, Kodfi, Hazen, lime amount, carbon, Ec and kd/cl) were compared with evidence sample.  Finding data and extracted figures of Bayazeh and Boshgan sedimentary samples which were confirmed by central lab and Geography faculty of University of Isfahan indicated severe differentiation between Bayazeh sediments and loose deposits of Boshgan.  Moreover, applied qualitative analyses on surface of sediments clearly shows that deformations of concavity to plane surface and slope changes from 2.5% to 0.7% in Bayazeh deposits indicate the difference of origin and process in these sediments.  Therefore, can be accepting the Gorji (1387) opinion about lake origin of Bayazeh sediments with high assertive.  Key words: Loess, Bayaze, Granlometry, morphoscooy, Calcymetry   References  Abari, H., & Ramesht. 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Geomorph. 36:231-256.      e-mail: mrnowjavan@yahoo.com   A. R. Arab Ameri, M. A. Student of Geomorphology, University of Isfahan, Isfahan, Iran. |