Electron Probe Microanalyzer (EPMA) data from a selection of tephra occurrences drilled at IODP Sites 350-U1436 and 350-U1437. (NERC grant NE/M005240/1)
Many tephra layers were identified in sediment cores drilled during IODP Expedition 350. Here, 1092 glass shards from 76 tephra occurrences (layer or patch) were analysed using electron probe microanalyses (EPMA). Data are not averaged, nor normalised. Geochemistry data were collected for: SiO2, TiO2, Al2O3, Cr2O3, FeO, MnO, MgO, CaO, Na2O, K2O, P2O5, SO3, Cl and O. Secondary standard data are given, as well as beam setup conditions. The data were obtained using the instruments at the University of Bristol, over two sessions during October and November 2014.
dataset
http://www.bgs.ac.uk/services/ngdc/accessions/index.html#item108150
function: download
http://data.bgs.ac.uk/id/dataHolding/13607294
eng
Site 350-U1437 is located at 31°47.391′N, 139°01.579′E; 2116.1 m water depth in the Izu rear arc, ~330 km west of the axis of the Izu-Bonin Trench and ~90 km west of the arc-front volcanoes Myojinsho and Myojin Knoll at 2117 mbsl. Site 350-U1436 is located at 32°23.883′N, 140°21.928′E; (1776 m water depth), in the western half of the Izu-Bonin fore-arc basin, ~60 km east of the arc-front volcano Aogashima and ~170 km west of the axis of the Izu-Bonin Trench.
geoscientificInformation
publication
2008-06-01
Volcanic ejecta
Grain size analysis
revision
2011
NERC_DDC
139.0200
140.3700
32.4000
31.7800
creation
1979
BONIN TRENCH [id=926400]
2014-10-22
2014-10-24
creation
2018-03-21
notApplicable
Particle size distributions were measured with a Malvern Mastersizer 2000 laser diffraction particle size analyser. All samples were placed on a shaking table for at least 10 minutes prior to analysis. Each sample was run 3 times in order to check the reproducibility of the measurements. The mean of each set of results was taken to calculate the values for each sample. The raw data are also included. All analyses were conducted at the National Oceanography Centre, Southampton.
publication
2011
false
See the referenced specification
publication
2010-12-08
false
See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF
MS Excel
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Honorary Senior Research Associate
University of Bristol
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Bristol
BS8 1RJ
United Kingdom
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British Geological Survey
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2022-01-19