نتایج جستجو برای: loess deposits
تعداد نتایج: 31955 فیلتر نتایج به سال:
Abstract Chinese loess-paleosol sequences have long been regarded as the continental counterpart of deep-sea sediments in terms their record Quaternary glacial–interglacial cycles. However, absolute chronologies for older than ca. 130 ka on Loess Plateau are scarce. We conducted first high-resolution luminescence dating, extending back to 350 ka, classical Luochuan loess section central Plateau...
Introduction One of the processes of the Quaternary era is the glacial and interglacial periods. In the glacial period, loesses deposited and in the interglacial period, Paleosoils were formed. The northern part of Iran is geographically the same as countries such as China, a large part of which has been covered with loess sediments during the Pleistocene glacial period. Loess sediments in ...
Lanzhou New District is the first and largest national-level new district in the Loess Plateau region of China. Large-scale land creation and rapid utilization of the land surface for construction has induced various magnitudes of land subsidence in the region, which is posing an increasing threat to the built environment and quality of life. In this study, the spatial and temporal evolution of...
This study presents an overview of Middle Pleistocene loess–palaeosol sequences (LPS) in northern France and discusses the palaeoclimatic significance pedosedimentary record context western European LPS global climatic cycles for last 750 ka. In this area, oldest loess deposits (early Pleistocene) are preserved sedimentary traps (leeward scarps fluvial terraces dissolution sinkholes). They resu...
Fine-grained materials of Clayey Loess deposits of Gorgan region were mixed with sand dune in the lab with various rations and their shear behavior was measured and evaluated by direct shear test. The result of the study showed that the increase of fine-grained clay in sand dune was directly related to the adhesion force and inversely to the internal friction angle. The increase or reduction in...
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