Identification info

Metadata Language

English (en)

Dataset Reference Date ()

2021-03-02

Identifier

http://data.bgs.ac.uk/id/dataHolding/13607726

Maintenance and update frequency

notApplicable

GEMET - INSPIRE themes

• Geology

Keywords

• NERC_DDC

Limitations on Public Access

otherRestrictions

Other constraints

licenceOGL

Other constraints

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

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

WORLD [id=100000]

Dataset Reference Date ()

1979

Begin date

2010-10-01

End date

2019-11-01

 

Distribution Information

Data format

• MS Excel

  ()

 

Quality Scope

dataset

Other

dataset

Statement

Tephra layers are recorded in the Visual Core Description (VCD) during systematic logging of sediment cores on board during an expedition. Every expedition produces reports which include the visual core description forms (VCDs), these were the primary source used for VOLCORE data collection. Visual core description forms for all OD expeditions were individually inspected for recording of tephra, ash, glass or other volcanic products. To be consistent across all of the expeditions only the shipboard VCDs were used as the data source, published post-cruise literature were not used. If the user is interested in a particular expedition, they should check the literature for post-expedition updates regarding tephra identification. VOLCORE provides a global overview of volcanism via a standardised data capture method, it does not include post-expedition studies. The data were collected from 3,886 drill holes (expeditions 1–381), distributed across all major seas and oceans. For each tephra layer that passed the criteria (>25% tephra content) we extracted data on core location, on depth down the core and tephra layer thickness. Definitions of a ‘tephra layer’ vary between expeditions, so care should be taken when using VOLCORE, it is highly advisable to carefully read the accompanying data descriptor paper ( https://www.nature.com/articles/s41597-020-00673-1). The data are spread over five worksheets, one with details per tephra layer (or patch), one with details for each drill hole, one with the age-depth models used in this study, one with the coring information for each drill hole. A fifth sheet titled ‘Key’ describes the basic meaning of every column in the data worksheets. The individual data sheets can be linked via the common Hole and Site ID fields (HID, SID). We estimated the age of the layer using age-depth models for each drill hole. In each age-depth model the rate of deposition between tie points in the age-depth model is assumed to be linear. The listing of a tephra layer in VOLCORE is based on descriptive criteria and does not imply any firm knowledge of source processes, i.e. primary fall, flow or reworking.

Metadata

File identifier

bec2eef1-8ab5-2fa1-e054-002128a47908 XML

Metadata Language

English (en)

Resource type

dataset

Metadata Date

2022-05-27

Metadata standard name

UK GEMINI

Metadata standard version

2.3