Cosmogenic 10Be and 26Al ages of Holocene moraines in southern Norway II: evidence for individualistic responses of high-altitude glaciers to millennial-scale climatic fluctuations

The Holocene ◽  
2008 ◽  
Vol 18 (8) ◽  
pp. 1165-1177 ◽  
Author(s):  
Richard A. Shakesby ◽  
John A. Matthews ◽  
Christoph Schnabel
Keyword(s):  
High Altitude ◽  
Climatic Fluctuations ◽  
Southern Norway ◽  
Cosmogenic 10Be ◽  
Millennial Scale

scholarly journals Millennial-scale denudation rates in the Himalaya of Far Western Nepal

2019 ◽  
Author(s):  
Lujendra Ojha ◽  
Ken L. Ferrier ◽  
Tank Ojha
Keyword(s):  
Stream Power ◽  
Denudation Rate ◽  
The Past ◽  
Cosmogenic Nuclide ◽  
Northern India ◽  
Denudation Rates ◽  
Cosmogenic 10Be ◽  
Channel Steepness ◽  
The Himalaya ◽  
Millennial Scale

Abstract. Over the past two decades, rates and patterns of Himalayan denudation have been documented through numerous cosmogenic nuclide measurements in central and eastern Nepal, Bhutan, and northern India. To date, however, few denudation rates have been measured in Far Western Nepal – a ~ 300-km-wide region near the center of the Himalayan arc – which presents a significant gap in our understanding of Himalayan denudation. Here we report new catchment-averaged millennial-scale denudation rates inferred from cosmogenic 10Be in fluvial quartz at seven sites in Far Western Nepal. The inferred denudation rates range from 385 ± 31 t km−2 yr−1 (0.15 ± 0.01 mm yr −1) to 8737 ± 2908 t km−2 yr−1 (3.3 ± 1.1 mm yr−1), and, in combination with our analyses of channel topography, are broadly consistent with previously published relationships between catchment-averaged denudation rates and normalized channel steepness across the Himalaya. These data show a weak correlation with catchment-averaged specific stream power, consistent with a Himalaya-wide compilation of previously published stream power values. Together, these observations are consistent with a dependence of denudation rate on both tectonic and climatic forcings, and represent a first step toward filling an important gap in denudation rate measurements in Far Western Nepal.

Glacier variations in Breheimen, southern Norway: relative-age dating of Holocene moraine complexes at six high-altitude glaciers

The Holocene ◽  
2004 ◽  
Vol 14 (6) ◽  
pp. 899-910 ◽  
Author(s):  
Richard A. Shakesby ◽  
John A. Matthews ◽  
Stefan Winkler
Keyword(s):  
High Altitude ◽  
Age Dating ◽  
Relative Age ◽  
Southern Norway

scholarly journals Millennial-scale denudation rates in the Himalaya of Far Western Nepal

2019 ◽  
Vol 7 (4) ◽  
pp. 969-987
Author(s):  
Lujendra Ojha ◽  
Ken L. Ferrier ◽  
Tank Ojha
Keyword(s):  
Plate Boundary ◽  
Eurasian Plate ◽  
Stream Power ◽  
Denudation Rate ◽  
Northern India ◽  
Denudation Rates ◽  
Cosmogenic 10Be ◽  
Channel Steepness ◽  
The Himalaya ◽  
Millennial Scale

Abstract. The Himalayas stretch ∼3000 km along the Indo-Eurasian plate boundary. Along-strike variations in the fault geometry of the Main Himalayan Thrust (MHT) have given rise to significant variations in the topographic steepness, exhumation rate, and orographic precipitation along the Himalayan front. Over the past 2 decades, the rates and patterns of Himalayan denudation have been documented through numerous cosmogenic nuclide measurements in central and eastern Nepal, Bhutan, and northern India. To date, however, few denudation rates have been measured in Far Western Nepal, a ∼300 km wide region near the center of the Himalayan arc, which presents a significant gap in our understanding of Himalayan denudation. Here we report new catchment-averaged millennial-scale denudation rates inferred from cosmogenic 10Be in fluvial quartz at seven sites in Far Western Nepal. The inferred denudation rates range from 385±31 t km−2 yr−1 (0.15±0.01 mm yr−1) to 8737±2908 t km−2 yr−1 (3.3±1.1 mm yr−1) and, in combination with our analyses of channel topography, are broadly consistent with previously published relationships between catchment-averaged denudation rates and normalized channel steepness across the Himalaya. These data show that the denudation rate patterns in Far Western Nepal are consistent with those observed in central and eastern Nepal. The denudation rate estimates from Far Western Nepal show a weak correlation with catchment-averaged specific stream power, consistent with a Himalaya-wide compilation of previously published stream power values. Together, these observations are consistent with a dependence of denudation rate on both tectonic and climatic forcings, and they represent a first step toward filling an important gap in denudation rate measurements in Far Western Nepal.

scholarly journals A taxonomic and taphonomic study of Pleistocene fossil deposits from the western Nefud Desert, Saudi Arabia

2020 ◽  
Vol 95 ◽  
pp. 1-22
Author(s):  
Mathew Stewart ◽  
Julien Louys ◽  
Paul S. Breeze ◽  
Richard Clark-Wilson ◽  
Nick A. Drake ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Environmental Conditions ◽  
Arabian Peninsula ◽  
Salt Weathering ◽  
Climatic Fluctuations ◽  
Semiarid Grassland ◽  
The Past ◽  
Millennial Scale

AbstractOver the past decade, a growing interest has developed on the archaeology, palaeontology, and palaeoenvironments of the Arabian Peninsula. It is now clear that hominins repeatedly dispersed into Arabia, notably during pluvial interglacial periods when much of the peninsula was characterised by a semiarid grassland environment. During the intervening glacial phases, however, grasslands were replaced with arid and hyperarid deserts. These millennial-scale climatic fluctuations have subjected bones and fossils to a dramatic suite of environmental conditions, affecting their fossilisation and preservation. Yet, as relatively few palaeontological assemblages have been reported from the Pleistocene of Arabia, our understanding of the preservational pathways that skeletal elements can take in these types of environments is lacking. Here, we report the first widespread taxonomic and taphonomic assessment of Arabian fossil deposits. Novel fossil fauna are described and overall the fauna are consistent with a well-watered semiarid grassland environment. Likewise, the taphonomic results suggest that bones were deposited under more humid conditions than present in the region today. However, fossils often exhibit significant attrition, obscuring and fragmenting most finds. These are likely tied to wind abrasion, insolation, and salt weathering following fossilisation and exhumation, processes particularly prevalent in desert environments.

Cosmogenic 10Be and 26Al ages of Holocene moraines in southern Norway I: testing the method and confirmation of the date of the Erdalen Event (c. 10 ka) at its type-site

The Holocene ◽  
2008 ◽  
Vol 18 (8) ◽  
pp. 1155-1164 ◽  
Author(s):  
John A. Matthews ◽  
Richard A. Shakesby ◽  
Christoph Schnabel ◽  
Stewart Freeman
Keyword(s):  
Type Site ◽  
Southern Norway ◽  
Cosmogenic 10Be
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