Identification info

Metadata Language

English (en)

Dataset Reference Date ()

2018-02-15

Identifier

http://data.bgs.ac.uk/id/dataHolding/13607279

Maintenance and update frequency

notApplicable

GEMET - INSPIRE themes

• Geology

BGS Thesaurus of Geosciences

• Volcanic ejecta

• Volcanic rocks

• Rift valleys

• Rift zone

Keywords

• NERC_DDC

Limitations on Public Access

otherRestrictions

Other constraints

no limitations

Other constraints

The dataset is made freely available for access, e.g. via the Internet. Either no third party data / information is contained in the dataset or BGS has secured written permission from the owner(s) of any third party data / information contained in the dataset to make the dataset freely accessible.

Use constraints

otherRestrictions

Other constraints

The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.

Other constraints

Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]"

Topic category

• Geoscientific information

Extent

Main Ethiopian Rift [id=985019]

Dataset Reference Date ()

1979

Begin date

2015-10-08

End date

2017-03-17

Additional information

Lead grant NE/L013932/1

 

Distribution Information

Data format

• MS Excel

  ()

 

Quality Scope

dataset

Other

dataset

Statement

Tephra samples were manually crushed, wet-sieved at 80 µm to remove alteration products, and dried at 50 °C. Ash shards were mounted in EpoFix resin and polished. Glass major element analyses was carried out by Electron Microprobe Analysis using a 4-spectrometer JEOL JXA-8600 Superprobe, with an accelerating voltage of 15 kV, a defocused beam of 10 (or 5) µm, and 6 (or 4) nA beam current. Elements were counted on-peak for 30 s (Si, Al, Fe, Ti, Mg, Ca, K), except for Na (12 s, analysed first), P (60 s), Mn and Cl (50 s). Off-peak background counting times were half the peak counting times. Data quality was continuously monitored by secondary glass standard analyses. Thirty individual points were attempted per sample. Only analyses with totals above 90 wt% were retained.

Metadata

File identifier

677076df-dcc3-7230-e054-002128a47908 XML

Metadata Language

English (en)

Resource type

dataset

Metadata Date

2022-01-28

Metadata standard name

UK GEMINI

Metadata standard version

2.3