نتایج جستجو برای: loess deposits

تعداد نتایج: 31955  

2010
Maryna Komar

The aim of the natural investigations carried out in two archaeological sites in the SE Poland was to determine their TL age (15 samples) and characterize the vegetation cover with the use of pollen analysis (10 samples) of loess and loess-like deposits sampled in the sites and their close environs. Micromorphological features of loess were examined in one of the sites. The research was carried...

Journal: :Quaternary Science Reviews 2022

The extensive Interior Alaska loess deposits record glacial advance and retreat over the past 3 Myrs. Refining our understanding of still-debated origins this will help us refine climate patterns since late Cenozoic. We present here first detrital-zircon ages from Gold Hill loess, a well-studied deposit in Fairbanks, Alaska, as well new local fluvial sediments. describe statistical approach to ...

2015
Yajie Dong Naiqin Wu Fengjiang Li Linpei Huang Wenwen Wen Cheng–Sen Li

The loess stratigraphic boundary at the Pleistocene/Holocene transition defined by the magnetic susceptibility (MS) has previously been assumed to be synchronous with the Marine Isotope Stage (MIS) 2/1 boundary, and approximately time-synchronous at different sections across the Chinese Loess Plateau (CLP). However, although this assumption has been used as a basis for proxy-age model of Chines...

ژورنال: کواترنری ایران 2018
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Introduction: The loess-paleosol sequences in Northern Iran are important archives represent several cycles of Quaternary climate change and can be used to complete the information gap on loess between Europe and central Asia. Loess geochemistry reflects paleoweathering conditions and it can be used to determine the nature and provenance of loess deposits. In the Caspian Lowlands, a pronounced...

Journal: :Earth Surface Processes and Landforms 2022

Loess deposits are common in the mid-latitudes and excellent records of past climate, landscape change dust. However, loess seldom reported from Fennoscandia. Here we investigate two former glaciofluvial areas central Sweden, Brattforsheden Bonäsheden, where post-glacial sand dune activity have been documented previously. Based on detailed mapping, grain size, scanning electron microscopy optic...

Journal: :Journal of Geophysical Research: Earth Surface 2013

Journal: :مرتع و آبخیزداری 0
محمد نهتانی دانشجوی دکتری آبخیزداری، دانشکدة منابع طبیعی دانشگاه تهران سادات فیض نیا استاد دانشکدة منابع طبیعی دانشگاه تهران حسن احمدی استاد دانشکدة منابع طبیعی دانشگاه تهران حمیدرضا پیروان استادیار پژوهشکدة حفاظت خاک و آبخیزداری کشور

loess deposit is one of the most important quaternary deposits of northeastern parts of iran which have high erosion rate. this study was performed with field- rainfall- simulator which has a plot area of 1 m2 in gorganrood drainage basin to determine the effective factors on sediment yield. landuse, slope and erosion feature maps were overlaid in gis to obtain land unit map. then on work units...

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