...Nicholas J. Colaianne; Charles M. Shobe; Joseph Moler; Kathleen C. Benison; Kristin D. Chilton Abstract Bedrock rivers adjust to the properties of the rock into which they incise, imprinting the geologic past on Earth's surface. We compared rock properties and channel form along the Dry Fork...

... for exploring the orogenic tectonic evolution. Here, we focus on the Eastern Pamir where extensional deformation dominates during the late Cenozoic. We conducted low-temperature thermochronological dating on bedrock samples collected from the footwall of the Kongur Shan normal fault together with inversion...

... the perimeters of the river’s floodplains and bedrock canyons for more than 600 km between the mouth of the Grand Canyon and the delta region in the Gulf of California. The formation is composed of a basal tan to light-yellowish-brown and pale-orange mud-dominated facies overlain and interbedded by a light...

... reserved 2024 © 2024 His Majesty the King in Right of Canada, as represented by the Minister of Natural Resources Although the use of magnetic data is a standard practice in bedrock geology, its application to surficial geology remains less common. We show here that aeromagnetic data collected...

... for the paleotopography of the Sierra Nevada and western Basin and Range. We conducted a new provenance analysis of paleochannel deposits in the Sierra Nevada and western Nevada using new and compiled detrital zircon U-Pb age data from across the preserved paleochannel network, together with compiled bedrock...

... with a recurrence interval of 100 to 150 years are referred to as L1 earthquakes. In this study, the broadband ground motion caused by a Nankai Trough scenario earthquake was predicted for the engineering bedrock beneath a site near the mouth of the Shijimi-gawa Canal, Aichi Prefecture, Japan...

... these issues, this paper presents a zircon U-Pb geochronological dataset derived for 24 bedrock samples and 19 modern river samples. The zircon U-Pb results reveal that the Eastern Cordillera of southern Colombia is underlain by basement rocks that originated in various tectonic events since ca. 1.5 Ga...

... mafic arc units are preferentially exposed. Comparison of sediment with bedrock compositions implies that the source terrains have been more efficient at removing CO 2 from the atmosphere compared with Himalayan drainages. Supplementary material : Details of analytical conditions, analytical results...

...Cassie Gann-Phillips, EERI; Ashly Cabas, EERI; Chunyang Ji, EERI; Chris Cramer, EERI; James Kaklamanos, EERI; Oliver Boyd The Atlantic and Gulf Coastal Plains (CPs) are characterized by widespread accumulations of low-velocity sediments and sedimentary rock that overlay high-velocity bedrock...

... collision. FDL-A is shearing within weathered bedrock ∼7.6 m below the embankment surface. It horizontally displaced a portion of the embankment ∼0.3 m as of November 1, 2023. Using the infinite slope approach and strength properties determined from laboratory testing, we estimate that FDL-A is impacting...

... are shown in Figure S10. Table S3 also presents the bedrock geology of the selected reference stations as inferred from a regional bedrock geology map ( Cui et al. , 2017 ). Having fixed the reference stations and the geometric spreading models, the inversion is repeated for all event types...

... provides constraints for reconstructing the Neoarchean evolution of the central Slave craton through bedrock mapping and facies analysis. The Itchen Formation consists of submature mudstone, siltstone, and sandstone, with preserved graded bedding, planar bedding, and flame structures. Unconformably...

...- and Na–Ca-rich smectites. Of these, Ca- and Na-smectites are likely to be montmorillonites that provide potential natural analogues for the bentonite buffers and their long-term performance in fractured bedrock environments. The smectite minerals observed reflect the local parent rock mineral composition...

... with sediment depth. At one sample station, pore-water sodium concentrations exceed 2000 mg L −1 within 2 m of the sediment-water interface. Given the pore-water chemistry changes reported here, combined with information from previous studies of Lake Michigan bedrock geology, a Devonian formation brine...

...James Buckley; Rebecca A. Hodge; Louise J. Slater Abstract Bedrock rivers are commonly expected to have steeper and narrower channels than alluvial rivers. However, understanding of bedrock river characteristics has largely been based on small samples of sites in specific climates and upland...

...Lucas K. Zoet; Lillian Smith; Alex Mixtli; Jeremy Brooks; Dougal D. Hansen Abstract Abrasion acts to smooth glacial terrains and leaves behind linear scratch-like features (striations) on bedrock landscapes. Striations are often used as measures of glacier flow directions, but their morphology can...

...-dependent erosion rates. Here we analyse published apatite fission-track (AFT) data to constrain the spatial pattern of AFT bedrock ages across the landscape. We compare these bedrock ages with published detrital distribution to highlight ambiguity in the pattern of erosion. In contrast to earlier work, we...

... data collection. We present three case studies where we (1) map Quaternary and older strata to identify active faulting, (2) map shallow bedrock, and (3) identify the footprint of previous subsurface engineered structures. We suggest that this low-cost tool and approach can be used for decameter-scale...

... that of a narrow damage zone. Ostermeijer et al. [ 12 ] investigated bedrock exposure at the Borrego Fault in detail and suggested that the distribution patterns of fracture density might be more complex due to subsidiary faults. However, few studies compared the characteristics of fracture density between the two...

... (>175 km). However, major oxide data from till matrix geochemistry show a correlation with underlying bedrock, and this relationship is relatively common in areas of thin till cover and resistant bedrock lithologies. These results suggest a switch from an early phase of widespread erosion and long...