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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Basaltic sources but quartzose sand: sediment provenance, weathering, and recycling in the Uruguay River catchment Available to Purchase
Anatomy of Niger and Benue river sediments from clay to granule: grain-size dependence and provenance budgets, Nigeria Available to Purchase
Weathering in the West Africa Craton: Mineralogy and Geochemistry of Niger River Sediments Available to Purchase
The Segmented Zambezi Sedimentary System from Source to Sink: 1. Sand Petrology and Heavy Minerals Available to Purchase
The Congo deep-sea fan: Mineralogical, REE, and Nd-isotope variability in quartzose passive-margin sand Available to Purchase
Provenance of Cenozoic Indus Fan Sediments (IODP Sites U1456 and U1457) Available to Purchase
Petrology and multimineral fingerprinting of modern sand generated from a dissected magmatic arc (Lhasa River, Tibet) Available to Purchase
ABSTRACT High-resolution sand petrography and heavy mineral analyses help to frame U-Pb age and Hf isotope data from zircon grains, integrated in turn with geochemical data from detrital apatite, rutile, garnet, and monazite, and with Raman spectroscopy data from detrital amphibole, pyroxene, and epidote-group minerals. This multitechnique approach, including stream-profile analysis, was used to characterize components of the sediment flux and define erosion patterns across the Lhasa block, a complex continental arc terrane caught in the Himalayan collision. Litho-feldspatho-quartzose detrital modes and hornblende-dominated heavy mineral assemblages suggest that the majority (four fifths) of the sand bed load in the Lhasa River catchment is derived from erosion of granitoid batholiths. Gravel composition, however, is markedly different and dominated by volcanic pebbles in the trunk river, as in all of its four major tributaries, testifying to an order-of-magnitude difference in apparent erosion rates between granitoid batholiths and arc lavas. This marked contrast, partly explained by wide exposures of granitoid rocks in the rugged Nyainqêntanglha Range characterized by active incision, is notably amplified by the high sand-generation potential of granitoid rocks, which, in contrast to dense joint blocks of andesitic lavas, tend to disintegrate to sandy grus upon weathering. Sedimentary strata, making up a good half of exposed rocks, are also underrepresented in sand bed load, suggesting selective mechanical breakdown of nondurable shale/slate grains. This exposes a serious bias affecting estimates based on sand only, and it highlights the necessity for taking into account the entire size spectrum from mud to gravel in order to improve the accuracy of sediment budgets. Provenance analysis should involve multiple methods applied to multiple minerals, rather than be based solely on a single rare mineral, even if it is exceptionally laden with potential provenance information, such as zircon. We here divide arc-derived suites into those eroded from undissected arcs, in which nearly continuous volcanic cover is present, and those from dissected arcs, in which cogenetic plutons are widely exposed from erosional unroofing. —Dickinson and Suczek (1979, p. 2175)
Tracing Transcontinental Sand Transport: from Anatolia–zagros To the Rub' Al Khali Sand Sea Available to Purchase
Petrology of the Tista and Rangit river sands (Sikkim, India) Available to Purchase
Provenance of Passive-Margin Sand (Southern Africa) Available to Purchase
Weathering and Relative Durability of Detrital Minerals in Equatorial Climate: Sand Petrology and Geochemistry in the East African Rift Available to Purchase
Detrital Fingerprints of Fossil Continental-Subduction Zones (Axial Belt Provenance, European Alps) Available to Purchase
Tracking Paleodrainage in Pleistocene Foreland Basins Available to Purchase
Focused erosion in the Alps constrained by fission-track ages on detrital apatites Available to Purchase
Abstract Fission-track dating on detrital apatites from modern sands of the Po Delta is used for a provenance study of sediments in the Po River basin. Analysed samples show a fission-track grain-age distribution characterized by two prominent peaks at 7.7 Ma and 17 Ma. The youngest peak accounts for 46% of the total population of dated grains. This young component in the grain-age distribution is consistent with bedrock cooling ages observed in the Western Alps between the External Massifs and the Houiller unit, as well as in the Lepontine dome of the Central Alps and in the Miocene foredeep units of the Apennines, that overall represent only 12% of the orogenic source area. Results suggest that most of the sediment load in the last 10 2 –10 5 years was supplied by focused erosion of relatively small areas that experienced short-term erosion rates one order of magnitude higher than in the rest of the belt.