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fallout

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Journal Article
Journal: Geology
Published: 27 April 2020
Geology (2020) 48 (7): 678–682.
FIGURES
Journal Article
Journal: Elements
Published: 01 June 2019
Elements (2019) 15 (3): 185–190.
... the areas and thicknesses of the products ( Johnston et al. 2014 ). Thickness and grain size maps of fallout deposits have been used to estimate plume heights of the different eruptive phases ( Heiken and McCoy 1990 ; Sigurdsson et al. 1990 ; Cioni et al. 2000 ). Vent locations have been estimated using...
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Journal Article
Published: 06 February 2015
Journal of the Geological Society (2015) 172 (3): 287–293.
... deposit that we propose was formed by a dilute pyroclastic density current; pumice flow deposits; and a proximal lapilli and block fallout lobe. The inclined nature of the explosion is attributed to the asymmetric geometry around the vent. The explosion-derived pyroclastic density currents had notably...
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Journal Article
Published: 15 September 2014
Journal of the Geological Society (2014) 171 (6): 765–778.
... the other comprises conical edifices. The 1970 eruption can be classified as volcanic explosivity index (VEI) 3, with mainly phreatomagmatic phases that generated a bulk volume of about 0.1 km 3 of pyroclastic material and an eruptive column at least 10 km high, from which fallout deposits are recognized...
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Series: GSA Special Papers
Published: 01 September 2014
DOI: 10.1130/2014.2505(22)
... to early 537 A.D., which is more consistent with recent findings of a 6 mo to 18 mo time lag between volcanic eruptions and atmospheric fallout of their sulfate aerosols. Our new time scale is consistent with a small volcanic input to the A.D. 536–537 climate downturn. We use the time range of Ni-rich...
Journal Article
Published: 20 March 2014
Journal of the Geological Society (2014) 171 (3): 375–387.
... ranging from Strombolian to sub-Plinian styles that are represented by fallout and pyroclastic density current deposits. Although some of the pumice deposits have been related to known sources, a few have not been linked to a specific vent. The use of field data as well as geochemical and mineralogical...
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Series: GSA Special Papers
Published: 01 September 2010
DOI: 10.1130/2010.2465(10)
... from the upper sediment parts of the target could be recorded. Macroscopically and microscopically, melt fragments have mostly irregular shapes, which lead to the tentative conclusion that only part of the melt—and by implication suevite—mass is derived from fallout of the ejecta curtain. On the other...
Series: GSA Special Papers
Published: 01 September 2010
DOI: 10.1130/2010.2465(21)
... encountered in core LB-05B. In contrast, the out-of-crater suevites formed by fallout from a laterally differentiated ejecta plume, which resulted in different clast populations to the north and south of the crater. ...
Series: GSA Special Papers
Published: 01 September 2010
DOI: 10.1130/2010.2465(22)
... of the chemical compositions of crater-fill and fallout suevites, as well as between proximal and distal impactites, reveals that LB-08A suevites have higher MgO, CaO, and Na 2 O contents than fallout suevites and, similarly, that the CaO and Na 2 O contents are higher by a factor of approximately two in LB-08A...
Journal Article
Journal: Elements
Published: 01 August 2010
Elements (2010) 6 (4): 269–270.
Journal Article
Published: 11 November 2009
Geological Magazine (2010) 147 (3): 391–415.
.... A short pause in scoria fallout was observed that coincides with the transition between Phases 2 and 3 of the eruption. On the crater rim there is clear evidence for the different phases, owing to the stratification of the deposits; however, away from the crater, stratigraphic breaks suggesting any...
Journal Article
Journal: Geology
Published: 01 November 2006
Geology (2006) 34 (11): 921–924.
..., is subsequently precipitated as acid fog immediately downwind from Kilauea caldera in the Kau Desert. The characteristic pH of surface tephra deposits is <4.0 in Sand Wash, a region of nearly continuous, acidic aerosol fallout immediately southwest of the caldera. Vertical exposures of unconsolidated tephras...
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Journal Article
Published: 01 September 2002
Geological Magazine (2002) 139 (5): 541–558.
...STEPHAN KÖNIGER; VOLKER LORENZ Abstract Thin, but laterally widespread, fallout ash tuff layers interbedded with complex fluvio-lacustrine successions of the Carboniferous–Permian late Variscan intermontane Saar–Nahe Basin in southwestern Germany provide important tephrostratigraphic markers...
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Journal Article
Published: 01 June 2001
Environmental Geosciences (2001) 8 (2): 130–139.
..., 1961 ). Therefore, accurate measurement of the surface-emanated eU decay series radiation requires measurement and removal of the atmospheric eU contribution to the overall data. Time variations of field gamma ray spectra composed of naturally occurring radiation plus nuclear fallout radiation were...
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Journal Article
Published: 01 January 1997
Environmental and Engineering Geoscience (1997) III (3): 375–387.
Journal Article
Published: 01 July 1982
Canadian Journal of Earth Sciences (1982) 19 (7): 1395–1407.
... ) and gypsum formed through reaction of H 2 SO 4 fallout with exposed carbonate rocks show similar negative δ 34 S values. Negative δ 18 O values for the sulfate radical in H 2 SO 4 fallout and in the alteration product indicate that more than half of the oxygen reacting with airborne H 2 S is derived from...
Series: GSA Special Papers
Published: 01 January 1982
DOI: 10.1130/SPE190-p175
Series: GSA Special Papers
Published: 01 January 1982
DOI: 10.1130/SPE190-p187
Series: GSA Special Papers
Published: 01 January 1982
DOI: 10.1130/SPE190-p211
Journal Article
Published: 01 April 1979
Canadian Journal of Earth Sciences (1979) 16 (4): 965–970.
...Gail M. Ashley; Lutz E. Moritz Abstract The stratigraphic record of 137 Cs activity levels found in Pitt Lake, British Columbia, mimics the radioactive fallout values for 137 Cs and 90 Sr recorded in milk from the adjacent Fraser Valley. The Pitt Lake record closely parallels the fallout values...