Block alignments/talus flatiron stages as response to lithological factors and dynamic slope changes in the Central Ebro Basin, NE Spain

Peña-Monné, José Luis; Sampietro-Vattuone, María Marta; Picazo-Millán, Jesús; Alcolea-Gracia, Marta

doi:10.1016/j.quascirev.2024.108864

Quaternary Science Reviews

2024

DOI: 10.1016/j.quascirev.2024.108864

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Block alignments/talus flatiron stages as response to lithological factors and dynamic slope changes in the Central Ebro Basin, NE Spain

José Luis Peña-Monné,

María Marta Sampietro-Vattuone,

Jesús Picazo-Millán

et al.

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2024

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Cited by 2 publications

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Schmidt-hammer exposure-age dating of talus slopes in upper Jostedalen, southern Norway: Interpreting the age and development of diachronous surfaces

Matthews,

Mourne

2024

The Holocene

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Schmidt-hammer exposure-age dating (SHD) was used to evaluate the surface age, dynamics and evolution of eight talus (scree) slopes located between ~520 and ~1010 m a.s.l. in the upper Jostedalen area of southern Norway. Statistically significant differences in mean R-values were found between talus slopes but there was no consistent difference in R-values between three mid- to lower-slope positions, two operators, or first and second impacts from the same boulders. A new regional age-calibration equation yielded SHD ages ranging from 8425 ± 700 years to 2620 ± 740 years. SHD ages from talus slopes and other landforms with diachronous surfaces (such as alluvial fans, snow-avalanche fans, pronival ramparts and rock glaciers) represent the average exposure age of the surface boulders and provide insights into landform evolution. Here, our SHD ages are interpreted in terms of Early Holocene paraglacial rock-slope instability, Mid-Holocene permafrost degradation, low but possibly variable rates of rockfall activity in the Late-Holocene, and spatial variations affected by local site differences. Survival of rock particles with relatively old exposure ages towards the distal margins of the talus slopes is attributed to their slow development with low levels of modern activity. SHD ages from diachronous surfaces may considerably underestimate landform age (defined as the onset of landform formation). Greater application can be anticipated, however, in the inference of landform dynamics from the R-value distributions of diachronous surfaces and in the use of SHD age as an indicator of the extent of modern activity.

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Schmidt-hammer exposure-age dating of talus slopes in upper Jostedalen, southern Norway: Interpreting the age and development of diachronous surfaces

Matthews,

Mourne

2024

The Holocene

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Towards a Better Understanding of Subsurface Processes in the Evolution of Sandstone Tablelands—Patterns and Controls of Contemporary Sand Removal from Sandstone Caprock, Stołowe Mountains Tableland, SW Poland

Duszyński,

Kacprzak,

Jancewicz

et al. 2024

Geosciences

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This paper reports the results of two-years’ monitoring of sand evacuation from a sandstone tableland through fissure systems and discusses the findings in the context of geomorphic evolution of tablelands, especially addressing the role of subterranean processes. A field experiment using specially designed sand collectors and involving sampling in approximately monthly intervals was carried out at six sites in SW Poland, representing two adjacent but contrasting settings: a mesa and a cuesta front. Data about sand deposition were then analyzed against precipitation data from a station located next to the sites. Sediment volumes deposited during the monitoring period were considerably different between the sites, with those at the mesa much higher than those at the cuesta. This is attributed to strong structural control influencing groundwater circulation pathways and the size of underground drainage systems, which were much smaller next to the cuesta front. Relationships between denudation and precipitation are complex, although the role of very high rainfall events appears clear, especially for the mesa. In general, precipitation in excess of 70 mm during a few consecutive days typically resulted in a considerable outflow of sand. This study highlights the role of mechanical underground erosion in sandstone tablelands, long neglected, and quantifies the denudation process.

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Block alignments/talus flatiron stages as response to lithological factors and dynamic slope changes in the Central Ebro Basin, NE Spain

Cited by 2 publications

References 37 publications

Schmidt-hammer exposure-age dating of talus slopes in upper Jostedalen, southern Norway: Interpreting the age and development of diachronous surfaces

Schmidt-hammer exposure-age dating of talus slopes in upper Jostedalen, southern Norway: Interpreting the age and development of diachronous surfaces

Towards a Better Understanding of Subsurface Processes in the Evolution of Sandstone Tablelands—Patterns and Controls of Contemporary Sand Removal from Sandstone Caprock, Stołowe Mountains Tableland, SW Poland

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