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Showing 1 to 20 of 25 for “"Uplift Rates"”.
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Long-Term Surface Uplift History of the Active Banda Arc-Continent Collision: Depth and Age Analysis of Foraminifera from Rote and Savu Islands, Indonesia
… Rote and Savu Islands, Indonesia, reveals high rates of surface uplift in the past 1.5 Ma of the incipient Banda arc-continent collision. Paleodepth estimates are derived from benthonic forams and ages from planktonic forams. But estimates are complicated, however, by abundant reworking; yet …
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The interaction of climate, tectonics, and topography in the Olympic Mountains of Washington State: the influence of erosion on tectonic steady-state and the synthesis of the alpine glacial history
… glaciers on spatially variable erosion and rock uplift rates. As glaciers have long been present on the peninsula, could glacial erosion explain the observed pattern of rock uplift? A numerical model of glacial flow, ICE Cascade, is used to reconstruct the glacial extent of the Last Glacial …
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Bedrock channel response to tetonic, climatic and eustatic forcings
… in northern California, USA with known, varying rates and history of rock uplift. The initial application of a simple form of the model to the stream profiles suggests that (1) the channels are eroding at rates approximately equal to uplift rates (i.e. steady-state fluvial incision), and (2) …
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Interpretation of tectonics from digital elevation data in the San Gabriel Mountains, CA : evaluation of methods and data sources
… Mountains were used to estimate relative rock uplift rates. The results suggest that the eastern region of the San Gabriel Mountain is controlled by a high rock uplift rate while the western region is controlled by a low rock uplift rate. Furthermore, arrangement of the variations of the …
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Structural and Petrologic Evolution of Acadian Dome Structures in Southern Vermont
… for dome-stage fabric development, calculated uplift rates (1.2 to 1.7 km/m.y. and west to east younging of Acadian structural and metamorphic evolution. Thermobarometric and geochronologic estimates of metamorphic pressure - temperature (P-T) conditions and metamorphic cooling ages were used …
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Lithologic Controls on Bedrock Channel Morphology in the Buffalo River Basin
… models assume an equilibrium state between rock uplift rates and erosion rates. However, analysis of chi gradients of bedrock channels across several lithologies in the Buffalo River Basin reveals disequilibrium in the basin controlled by the presence of a thick interval of Pennsylvanian …
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Collisional Reactivation of Rift Margin Fracture Zones, Taiwan and the Taconic Allochthon
… to the topographic break. In addition, rock uplift rates were examined by extracting normalized steepness indices from streams with catchments ≥ 10 km<sup>2 </sup>within the Tachia, Peikang, and Mei River basins. With the incorporation of precise leveling data, zones of equal steepness …
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Determination and analysis of land deformation in major landslide areas in Kenya using geospatial techniques: A case study of Murang a and Nyeri counties
… valuable insights into vertical deformation rates at selected points of inter-est. These points were identified through InSAR processing using RADAR imagery from Sentinel-1 and ALOS PALSAR, which offered finer spatial resolution. While Sentinel-1 imagery was acquired and processed in both the …
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Determination and analysis of land deformation in major landslide areas in Kenya using geospatial techniques: A case study of Murang a and Nyeri counties
… valuable insights into vertical deformation rates at selected points of inter-est. These points were identified through InSAR processing using RADAR imagery from Sentinel-1 and ALOS PALSAR, which offered finer spatial resolution. While Sentinel-1 imagery was acquired and processed in both the …
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Uplift history and geomorphic development of the Southern Alps, New Zealand, assessed by fission track analysis
The uplift history and geomorphic development of the Southern Alps has been studied, using fission track analysis of basement samples in combination with measurement of the present geomorphology of the Southern Alps. During the late Cenozoic the Pacific plate has been converging obliquely with the …
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Stream profiles as a proxy for uplift in the San Bernardino Mountains
… San Gabriel Mountains, have been tectonically uplifted since the late Miocene due to transpression-related thrust faulting. Although regional uplift patterns are not as clear from this data as those of a stream profile analysis in the San Gabriel Mountains, the results observed indicate that …
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Cosmogenic dating of fluvial terraces in the Sorbas Basin, SE Spain
… transitions and in interglacial periods. New uplift rates calculated for the Pleistocene fluvial system suggest that tectonic activity in the Sorbas Basin has been episodic. The south margin and centre of the Sorbas Basin has uplifted at a faster rate than the northern margin impacting on the …
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Late Cenozoic uplift of southeastern Tibet
… landscape existed at low elevations prior to uplift and long-wavelength tilt of the southeastern plateau margin. The modern altitude of the erosion surface provides an excellent datum for constraining the total amount of surface uplift of the southeastern plateau margin. The long-wavelength …
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Late Cenozoic Exhumation in a Transpressional Setting: Fairweather Range, Alaska
… sedimentation (> 1cm/yr) and glacio-isostatic uplift rates (> 3 cm/yr) in the Fairweather corridor highlight short-term vertical deformation at the eastern margin; however, the relationship between these rates and long-term deformation is less well known. New low-temperature cooling ages are …
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Late Pleistocene-Holocene sedimentary processes at the active margin of South-Central Chile : marine and lacustrine sediment records as archives of tectonics and climate variability
… by local forearc tectonics. Accelerating uplift rates along major tectonic structures involved drainage anomalies and river flow inversions, which seriously altered the sediment supply to the Pacific Ocean. Two examples for the tectonic hindrance of fluvial systems are the coastal lakes …
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Pliocene-Pleistocene landscape evolution in south-central Chile : interactions between tectonic, geomorphic, and climatic processes
… Bueno segments are undergoing active tectonic uplift. The long-term behavior of these two segments is manifested in form of two doubly plunging, growing antiforms that constitute an integral part of the Coastal Cordillera and record the uplift of marine and river terraces. In addition, these …
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The structural, metamorphic and thermal history of the Sonnblick Dome, southeast Tauern Window, Austria
… probably represent conditions developed during uplift from initially greater depths. White mica isotopic ages suggest that the peak of metamorphism took place at 25-28Ma, with older ages being observed towards the southeastern end of the Dome. Post-metamorphic cooling rates appear to be variable …
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Fluid evolution during metamorphism and uplift of the massive sulfide deposits at Ducktown, Tennessee, U.S.A.
… and subsequent conversion of CO₂ to CH₄ during uplift in response to an fH₂ gradient between inclusion and matrix fluids. Low δD values of primary fluid inclusions are consistent with diffusive addition of isotopically light hydrogen after trapping. Secondary inclusions in metamorphic quartz …
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Post-Orogenic Exhumation and Glacial Erosion on the Flanks of the North Atlantic
… glaciation, often associated with enhanced rates of erosion, is one such possible cause of passive margin rejuvenation. However, along passive margins the effectiveness of Plio-Pleistocene glaciers at eroding the landscape may be limited by low tectonic rock uplift rates or as a result of …
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Global Analysis of Predicted and Observed Dynamic Topography
… linked to asthenospheric temperature anomalies. Uplift rates of up to 0.1 mm a$^{-1}$ place important constraints on the spatio-temporal evolution of dynamic topography and suggest that rates of transient vertical motion exceed those predicted by many modelling studies. Most numerical models …
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