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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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Kenya
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Wenlock (1)
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Talchir Formation (1)
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Precambrian
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upper Precambrian
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Primary terms
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Africa
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Tanzania
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Southern Africa
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Antarctica
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atmosphere (1)
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carbon
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Cenozoic
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Quaternary
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Holocene
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upper Holocene (1)
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Mazama Ash (2)
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Pleistocene
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upper Pleistocene (1)
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Tertiary
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Neogene
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Miocene (1)
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Neyveli Lignite (1)
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Paleogene
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Eocene
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lower Eocene (3)
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Kenai Group (1)
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Oligocene
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middle Oligocene
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Bucatunna Formation (1)
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Byram Formation (1)
-
-
Vicksburg Group (1)
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Paleocene
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upper Paleocene (1)
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Tyonek Formation (1)
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Wilcox Group (2)
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-
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ceramic materials (1)
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chemical analysis (5)
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Chordata
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Vertebrata
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Tetrapoda
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Aves (1)
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clay deposits (1)
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Mesozoic
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Cretaceous
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Jurassic
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Triassic
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metals
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
ash
Comparing the short-term leaching behaviour of cements containing supplementary cementitious materials in different leachants for low-level waste encapsulation Open Access
Prediction of Overburden Failure on the Working Face Using Self-Formed Roadway Mining Technology without Coal Pillars Based on Microseismic Monitoring: A Case Study Open Access
Improvement of Fluidity and Long-term Strength of Cemented Paste Backfill with Low Calcium Fly-ash Available to Purchase
Analysis of energy dissipation characteristics and numerical simulation of surrounding rock control for backfill combinations with different ash/sand ratios Available to Purchase
Geochemical Characteristics of the Bottom and Pond Fly ash, Neyveli, Cuddalore District, Tamil Nadu, India Available to Purchase
Ordovician tephra distribution, tephrochronology and geochronology Available to Purchase
Abstract The study of Ordovician tephras yields a wealth of valuable information about regional tectonism, sedimentation, stratigraphic correlation, and process rates. As such, these layers are prized by geologists and are the subject of a rich literature. Ordovician tephra studies were pioneering, particularly in the development of chemical fingerprinting to improve precision in tephrochronology. Modern radioisotope geochronology utilizes zircons and other phenocrysts from these layers to generate eruption ages with uncertainty on the order of a hundred thousand years. When integrated with biostratigraphy, chemostratigraphy and astrochronology, tephra ages provide an unparalleled opportunity to constrain process rates. Fifty such Ordovician tephra ages have been published over the last decade from U–Pb analysis of individual zircon phenocrysts, providing geochronological coverage across all stages of the Ordovician. Laurentia dominates this coverage (24) followed by the Baltic Basin (12), North Gondwana (11), Cuyania (four) and the Siberian Tungus Basin (one). Future tephra studies should seek to fill the numerous remaining gaps in the Ordovician time scale.
Volcanically-derived deposits and sequences: a unified terminological scheme for application in modern and ancient environments Available to Purchase
Abstract The genesis of particles and their transport mechanisms are the two fundamental factors driving the accumulation of sediments associated with volcanism or derived from volcanic sources. These factors are therefore the most important criteria on which to base a useful classification of sediments in such environments. However, the relative significance of the nature of particles v. the transporting mechanism forming a deposit varies in existing terminological schemes: those schemes applied where volcanological contextual information is available tend to give precedence to the transportation process; whereas sedimentological schemes examining ancient deposits tend to focus principally on the nature of particles. Here, we provide an outline of the challenges in classifying volcanically derived sediments and put forward a scheme that aims to bridge current terminological differences and accommodate variable levels of uncertainty. This work defines three endmembers ( primary volcaniclastic , secondary volcaniclastic , volcanic epiclastic ) that correspond to (a) deposits whose particles are produced, transported and emplaced directly by volcanic mechanisms; (b) deposits whose particles are produced directly by volcanic events but transported and accumulated by non-volcanic mechanisms, either in continuum with the events or after interim storage; (c) deposits whose particles are produced by weathering/erosion of volcanic terrains and transportation of derived material by non-volcanic mechanisms. When the complex combination of genetic and transportation processes accumulating volcaniclastic sequences is not clear, but a strong relationship between an eruptive event and the studied volcaniclastic deposit can still be demonstrated, a further category ( volcanogenic ) has been introduced.
Characterization of Ash Samples from the Kelud (Indonesia) Volcanic Eruption of 2014 and its Environmental Implications Available to Purchase
Assessment of Metal Pollution of Overburden in a Tropical Coalfield, Ib valley, India: A Case Study Available to Purchase
Pyroclastic deposits of Ubehebe Crater, Death Valley, California, USA: Ballistics, pyroclastic surges, and dry granular flows Open Access
Lithologic controls on microfracturing from legacy underground nuclear explosions Open Access
Partitioning of Rare Earth Elements (REEs) from Coal to Coal Fly Ash in Different Thermal Power Stations (TPSs) of India Available to Purchase
Organic Geochemical Assessment and Characterisation of Extra-Peninsular Gondwana Coal From Kalijhora Basin, Darjeeling District, West Bengal, India Available to Purchase
Evolution of Opencast Mines in the Raniganj Coalfield (India): An Assessment through Multi-temporal Satellite Data Available to Purchase
Emergence of wet conditions in the Mono Basin of the Western USA coincident with inception of the Last Glaciation Available to Purchase
Finding a New Coal Seam in Chandra Area, Surguja District, Chattisgarh, India Available to Purchase
Stratigraphic and Geochemical Evidence for the Alteration of Calcareous Glauconitic Marine Sediments to Calcium Bentonite Available to Purchase
Chapter 6.1 Marine record of Antarctic volcanism from drill cores Available to Purchase
Abstract We review here data and information on Antarctic volcanism resulting from recent tephrostratigraphic investigations on marine cores. Records include deep drill cores recovered during oceanographic expeditions: DSDP, ODP and IODP drill cores recovered during ice-based and land-based international cooperative drilling programmes DVDP 15, MSSTS-1, CIROS-1 and CIROS-2, DVDP 15, CRP-1, CRP-2/2A and CRP-3, ANDRILL-MIS and ANDRILL-SMS, and shallow gravity and piston cores recovered in the Antarctic and sub-Antarctic oceans. We report on the identification of visible volcaniclastic horizons and, in particular, of primary tephra within the marine sequences. Where available, the results of analyses carried out on these products are presented. The volcanic material identified differs in its nature, composition and emplacement mechanisms. It was derived from different sources on the Antarctic continent and was emplaced over a wide time span. Marine sediments contain a more complete record of the explosive activity from Antarctic volcanoes and are complementary to those obtained by land-based studies. This record provides important information for volcanological reconstructions including approximate intensities and magnitudes of eruptions, and their duration, age and recurrence, as well as their eruptive dynamics. In addition, characterized tephra layers represent an invaluable chronological tool essential in establishing correlations between different archives and in synchronizing climate records.