نتایج جستجو برای: glacial erosion

تعداد نتایج: 41285  

Journal: :Science 1997
Brozović Burbank Meigs

The interaction between tectonism and erosion produces rugged landscapes in actively deforming regions. In the northwestern Himalaya, the form of the landscape was found to be largely independent of exhumation rates, but regional trends in mean and modal elevations, hypsometry (frequency distribution of altitude), and slope distributions were correlated with the extent of glaciation. These obse...

2012
W. Wyatt Oswald Daniel G. Gavin Patricia M. Anderson Linda B. Brubaker Feng Sheng Hu

Analyses of lithology, organic-matter content, magnetic susceptibility, and pollen in a sediment core from Okpilak Lake, located in the northeastern Brooks Range, provide new insights into the history of climate, landscape processes, and vegetation in northern Alaska since 14,500 cal year BP. The late-glacial interval ([11,600 cal year BP) featured sparse vegetation cover and the erosion of min...

2015

This manuscript details magnetic mineral measurements from the sediments of Lake Ohrid, which serves as proxies for paleoenvironmental and paleoclimatic change. The new cores from Lake Ohrid comprise one of the longest continuous records from Europe, and the analyses and submission advance our understanding of the regional glacial-interglacial climate and environmental history. In particular, t...

2011
Lena Håkansson Jason P. Briner Ala Aldahan Göran Possnert

a r t i c l e i n f o Along the northeast Greenland continental margin, bedrock on interfjord plateaus is highly weathered, whereas rock surfaces in fjord troughs are characterized by glacial scour. Based on the intense bedrock weathering and lack of glacial deposits from the last glaciation, interfjord plateaus have long been thought to be ice-free throughout the last glacial maximum (LGM). In...

Journal: :Journal Of Geophysical Research: Earth Surface 2021

Abstract Alpine glacial erosion exerts a first‐order control on mountain topography and sediment production, but its mechanisms are poorly understood. Observational data capable of testing transport laws in models mostly lacking. New insights, however, can be gained from detrital tracer thermochronology. Detrital thermochronology works the premise that thermochronometer bedrock ages vary system...

2007
Eduardo Garzanti Giovanni Vezzoli Sergio Andò Jérôme Lavé Mikaël Attal Christian France-Lanord Peter DeCelles

We use petrographic and mineralogical data on modern sediments to investigate erosion patterns in the Marsyandi basin of the central Himalaya, a privileged natural laboratory in which a series of multidisciplinary geomorphological, sedimentological, geochemical and geochronological studies have been recently carried out to unravel the interrelationships between tectonic, climatic and sedimentar...

Journal: :Geophysical Research Letters 2022

The Patagonian slab window has been proposed to enhance the solid Earth response ice mass load changes in overlying Northern and Southern Icefields (NPI SPI, respectively). Here, we present first regional seismic velocity model covering entire north-south extent of window. A slow anomaly uppermost mantle indicates warm temperature, low viscosity, possibly partial melt. Low velocities just below...

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