Identification

Title

Foraminifera-based data spanning several tephra horizons in cores from IODP Leg 350, sites U1436 and U1437 (NERC grant NE/M005232/1)

Abstract

The dataset worksheet contains a list of core samples taken during IODP Exp 350 and foraminifera-based data for selected samples. The work was started with the aim of reconstructing palaeoproductivity changes (namely surface-to-deep carbon isotope gradients and U/Ca measurements) over tephra layers in order to test the ‘ash fertilisation hypothesis’. However, the work has been temporarily halted given the on-board volcanologists ongoing concerns that the ash layers in the selected cores have been reworked and therefore are not primary. Because of the induration and silicification of the core samples at quite shallow depths in the core, the other aim of the project (to reconstruct palaeoceanographic changes from 16-0 Ma) was not possible. The spreadsheet contains a full list of samples and a list of samples that have been examined and analysed. The data worksheet contains the no. of Globigerinoides ruber (with weight), Oridorsalis umbonatus, Uvigerina spp. and Cibicidoides spp. specimens for specific samples. For selected samples, stable oxygen and carbon isotopes are given and a graph of the carbon isotopes vs depth in core is presented.

Resource type

dataset

Resource locator

http://www.bgs.ac.uk/services/ngdc/accessions/index.html#item75489

function: download

Unique resource identifier

code

http://data.bgs.ac.uk/id/dataHolding/13607144

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

publication

effective date

2008-06-01

Keyword set

keyword value

Planktonic foraminifera

Benthonic foraminifera

Volcanic ejecta

Stable isotopes

originating controlled vocabulary

title

reference date

date type

revision

effective date

2011

Keyword set

keyword value

NERC_DDC

Geographic location

West bounding longitude

140.2700

East bounding longitude

140.4700

North bounding latitude

32.4900

South bounding latitude

32.2900

Extent

Extent group

authority code

title

reference date

date type

creation

effective date

1979

code identifying the extent

IZU-BONIN ARC [id=926430]

Temporal reference

Temporal extent

Begin position

2014-04

End position

2014-05

Dataset reference date

date type

creation

effective date

2017-04-16

Frequency of update

notApplicable

Quality and validity

Lineage

The cores were extracted on board the JOIDES Resolution in April and May 2014. Dr E John selected a 2x2 cm sample over selected intervals spanning both mafic and felsic tephra layers in cores U1437B and U1436A. At Cardiff University, selected samples were subjected to the following procedure: 1. Samples were soaked in distilled water overnight and gently disaggregated using fingertips. All samples were easy to disaggregate and did not require the use of detergent. 2. Samples were then wet-sieved through a 63-µm mesh and the coarse fraction was dried in an oven at 60°C, and weighed. 3. The sample was then dry-sieved to extract the 250-355 µm size fraction, which was used for foraminifera picking. 4. In each examined split, specimens of G. ruber, O. umbonatus, Uvigerina spp., and Cibicidoides spp. were picked using a fine paintbrush and then stored in micropalaeontological slides. 5. Those required for analysis were ultrasonically-cleaned and split open using a cleaned glass slide. Any adhering organic matter or silicate was removed using a fine paintbrush. The samples were then ultrasonically cleaned in 18ΩM water and left to dry in polypropylene microcentrifuge tubes. 6. Samples were then weighed into tin cups and placed into acid-cleaned tubes for stable isotope analysis which was performed on a Thermo MAT 253 with Kiel IV carbonate preparation device.

Conformity

Conformity report

specification

title

reference date

date type

publication

effective date

2011

degree

false

explanation

See the referenced specification

Conformity report

specification

title

reference date

date type

publication

effective date

2010-12-08

degree

false

explanation

See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF

Data format

name of format

Excel

version of format

Constraints related to access and use

Constraint set

Limitations on public access

Constraint set

Limitations on public access

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.

Responsible organisations

Responsible party

contact position

School of Earth and Ocean Sciences

organisation name

University of Cardiff

full postal address

Main Building

Cardiff

CF10 3AT

email address

not available

responsible party role

pointOfContact

Responsible party

contact position

School of Geography, Earth Science and Environment

organisation name

University of the South Pacific

full postal address

Laucala Campus

Suva

Fiji

email address

not available

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact

organisation name

British Geological Survey

full postal address

Environmental Science Centre,Keyworth

NOTTINGHAM

NG12 5GG

United Kingdom

telephone number

+44 115 936 3100

email address

enquiries@bgs.ac.uk

responsible party role

pointOfContact

Metadata date

2021-10-20

Metadata language