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GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Central Africa
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Congo River (1)
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Southern Africa
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South Africa (1)
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Arctic Ocean
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Arctic region
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Asia
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Far East
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China
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Chongqing China (1)
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Hubei China (1)
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Philippine Islands
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Taiwan (4)
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Himalayas (1)
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Indian Peninsula
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Pakistan (1)
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Middle East
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Israel
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Atlantic Ocean
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South Atlantic
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Australasia
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Hawke's Bay New Zealand (1)
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fossils
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Protista
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upper Quaternary (3)
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Tertiary
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Maikop Series (1)
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upper Cenozoic (2)
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Lake Bonneville (1)
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igneous rocks
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volcanic rocks
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illite (1)
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Primary terms
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absolute age (5)
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Africa
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Southern Africa
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South Africa (1)
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Arctic Ocean
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Barents Sea (1)
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Norwegian Sea (1)
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Arctic region
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Asia
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Far East
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Guizhou China (1)
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Yangtze River (1)
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Yunnan China (1)
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Philippine Islands
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Luzon
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Mount Pinatubo (2)
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Taiwan (4)
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Himalayas (1)
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Jharkhand India
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Karnataka India (1)
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Pakistan (1)
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Indus River (1)
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Atlantic Ocean
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South Atlantic
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carbon
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Cenozoic
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Boreal (1)
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upper Holocene (7)
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Pleistocene
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middle Pleistocene (1)
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upper Pleistocene
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Weichselian
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upper Weichselian
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Allerod (1)
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Younger Dryas (1)
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upper Quaternary (3)
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Tertiary
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Maikop Series (1)
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upper Miocene
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Southern Europe
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Dinaric Alps (1)
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Be-10 (7)
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Be-7 (2)
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metamorphic rocks
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metasedimentary rocks
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paragneiss (1)
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meteorology (1)
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helium
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He-3 (1)
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North America
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Appalachians
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Piedmont (2)
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Great Lakes region (1)
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Rocky Mountains
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U. S. Rocky Mountains
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San Juan Mountains (1)
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Wasatch Range (1)
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
sediment yield
Precursors to a continental-arc ignimbrite flare-up: Early central volcanoes of the San Juan Mountains, Colorado, USA Open Access
The influence of volcanic supply on the composition of modern river sands: the case study of the Ofanto River, southern Italy Available to Purchase
Abstract The Ofanto River drains volcanic rocks from the Monte Vulture, lacustrine–fluviolacustrine deposits associated with the same volcano and sedimentary deposits of the Southern Apennines and the Bradanic foredeep sequences. Comparing the modal composition of river sands and the outcrop area of different lithologies in the different sub-basins, an over-concentration of the volcaniclastic fraction, mainly represented by loose crystals of clinopyroxene, garnet and amphibole, is shown. This has been related to the preferential erosion of pyroclastic deposits, characterized by high production of sand-sized loose minerals, together with the carbonate lability and the low sand-sized detritus production from claystones and marls. The occurrence of volcaniclastic components upstream of Monte Vulture can be explained as a contribution from the lacustrine–fluviolacustrine deposits cropping out in the upstream sector or from pyroclastic fall deposits of Monte Vulture and/or Campanian volcanoes. This research shows that the volcanic record in the fluvial sands of the Ofanto River comes from weathering and sorting processes of volcaniclastic deposits rather than of the lavas building the main edifice. Therefore, caution must be taken during palaeoenvironmental and palaeoclimatic reconstructions when relating the type and abundance of the volcanic component in sediments to the weathering stage and evolutionary history of the volcano.
Sediment Yield Assessment, Prioritization and Control Practices in Chambal River Basin Employing SYI Model Available to Purchase
Stratigraphic analysis of XES02: Implications for the sequence stratigraphic paradigm Available to Purchase
Rainfall Induced Soil Erosion and Sediment Yield Assessment in Upper Brahmaputra River Basin Available to Purchase
Erosion due to a century of road construction and maintenance at Mount Diablo State Park, California Available to Purchase
ABSTRACT Mount Diablo State Park exemplifies many other conservation areas where managers balance the dual missions of protecting natural resources while providing public access. Roads and trails that crisscross the park are etched into the geomorphic surface, capturing and redirecting storm runoff, and presenting both a challenge for soil conservation and a consequence of construction and maintenance. We used field mapping, remote sensing, and modeling to assess erosion along the roads and trails in Mount Diablo State Park, which encompasses the headwaters of several urbanized watersheds. The field mapping in 2011 determined that 56% of the assessed roads and trails required either repair or reconstruction to control erosion and that ~67% of the culverts in the park required either repair or replacement. Aerial photography and modeling showed that other erosion (unrelated to roads or trails) preferentially occurred during wet periods, in specific lithologies, and on convergent slopes. Although lithology and climate drive slope-forming geomorphic processes, we found that the road and trail system (1) expanded the stream network with a capillary-like system of rills, (2) catalyzed prolonged erosion, and (3) altered the timing and pattern of sediment yield. In addition to water-driven erosion during wet periods, road and trail surfaces were subject to mechanical and wind erosion during dry periods. Spatially, dry erosion and runoff both conformed with and crossed topographic gradients by following the road and trail network. Road- and trail-induced erosion occurred across a wider range of rock properties and slope geometries than is typical for other erosion. Hence, the roads and trails have expanded the spatial and temporal boundary conditions over which geomorphic processes operate and, due to continual soil disturbance, have accelerated erosion rates. Although road density is a commonly used metric to rank road-related impacts at watershed scales, it misses both spatial variability and the opportunity to identify specific road and trail segments for remediation. We developed a spatially explicit scoring scheme based on actual erosion and the potential for sedimentation of discrete waterbodies. The data were incorporated into the park’s road and trail management plan in 2016.
Role of Climate and Topography on Hydrological Characteristics of the Bharathapuzha Basin in the Tectonically Quiescent Western Ghats, India Available to Purchase
Quantitative Analysis of Drainage Basin Parameters towards better Management of Damodar River, Eastern India Available to Purchase
Sediment and Nutrient Transfer from an Inter-montane Agricultural Catchment in Himachal Himalayas of Northwestern India Available to Purchase
Combining Instrumental Monitoring and High-Resolution Topography for Estimating Sediment Yield in a Debris-Flow Catchment Available to Purchase
Impact of Land Use-Land Cover and Climatic Pattern on Sediment Yield of Two Contrasting Sub-Catchments in Upper Tapi Basin, India Available to Purchase
Dry sediment loading of headwater channels fuels post-wildfire debris flows in bedrock landscapes Open Access
Evaluation of Hydrological Components Using Hydrological Model SWAT for Malaprabha Subbasin Available to Purchase
Some signals are not the same as they appear: How do erosional landscapes transform tectonic history into sediment flux records? Available to Purchase
Deep-water plays in the western Black Sea: insights into sediment supply within the Maykop depositional system Available to Purchase
Abstract The Oligocene–Early Miocene Maykop depositional system of the Western Black Sea Basin is investigated in terms of sediment supply and provenance. Potential sediment source regions and conduits for sediment supply into the deep-water portion of the basin are evaluated based on the tectonic history and framework of the region, and are supported by observations from published well, reflection seismic and isopach data. The outcrop geology of the present-day land areas adjacent to the basin is used as a guide to the likely provenance and, hence, quality of potential siliciclastic reservoirs. Reservoir presence and reservoir quality are key subsurface risks for exploration in deep-water plays involving Maykop turbidite sandstones and charge from the well-known Maykop organic carbon-rich mudstones that are widespread across the basin. Sediments sourced from the NE Moesian Platform and Dobrogea, channelled into the offshore Black Sea via the Histria Trough, are considered moderate risk in terms of primary reservoir quality, as evidenced by thick packages of fine-grained sediment. In contrast, sediments derived from the southern Strandja Massif fed into the Burgas Basin, and potentially into the deeper-water Turkish Black Sea, are relatively low risk in terms of reservoir quality, given the abundance of acidic intrusions within the massif. Sediment derived from parts of the northern Strandja Massif, especially the volcaniclastics of the Srednogornie region, are likely to have poorer reservoir quality characteristics. Sediments derived from the granitic Bolu Massif within the Pontides might be of good reservoir quality but are likely to be ponded behind the offshore Kozlu Ridge. An important sediment source-to-sink system was derived from the Balkanides and entered the deeper-water western Black Sea via the Kamchia Trough. The present-day Kamchia river is a relatively minor sediment supplier to the Black Sea, but the palaeo-Kamchia river of the Oligocene–Early Miocene would have exploited a much greater drainage area consisting of an axial trunk stream, occupying the newly formed Kamchia Foredeep to the north of the Balkanides, and transverse rivers sourcing sediment from the granitic and gneissic bodies of the Balkan Mountains and from Early Cretaceous and Palaeogene sandstones. These would provide reasonable reservoir quality, and it is estimated from reference source-to-sink relationships that offshore sediment flux via this system was probably at least eight times greater than at present. Known shelf-edge canyons in offshore Bulgaria facilitated this sediment reaching the deep water offshore, where a sedimentary fan with a length in excess of 150 km is likely to have developed. This suggests that the potential is good for encountering good-quality reservoir sands in the Maykop succession deep water of the western Black Sea, and this aspect of regional play risk could be of less concern than was previously considered.
Orbital-climate control of mass-flow sedimentation in a Miocene alluvial-fan succession (Teruel Basin, Spain) Available to Purchase
Abstract The role of climate change in driving alluvial-fan sedimentation is hard to assess in pre-Quaternary successions, for which detailed chronologies and climate-proxy records cannot be easily established. In the Teruel Basin (Spain), high-resolution (10 4 –10 5 years) chronological and palaeoclimatic information was derived by orbital tuning of Late Miocene mudflat to ephemeral-lake deposits. The semi-arid palaeoclimate made this low-gradient, basinal environment sensitive to thresholds in the local hydrological balance. Basic facies rhythms are attributed to alternating, relatively humid/arid phases controlled by the climatic precession cycle. The lower stratigraphic interval of this reference section interfingers with distal, coarse-clastic beds from a coeval alluvial fan. The consistent interdigitation of debris-flow deposits with distal strata indicative of arid-to-humid climate transitions shows that fan sedimentation was regulated by climate cyclicity. In particular, the largest volumes of terrigenous debris were shed from the fan onto adjacent mudflats during transitions to relatively humid periods with pronounced seasonality, during precession minima. Distal to medial sections within alluvial-fan outcrops also feature prominent, laterally continuous alternations of coarse- and fine-clastic packages. This high degree of architectural organization, uncommon in fan successions, and stratigraphic relationships with the reference section suggest orbitally controlled climate change to have been the forcing mechanism.