Lake Chala (Kenya/Tanzania) chronology and isotope data, 0 - >250 kyr BP (DeepCHALLA project) (NERC Grant NE/P011969/1)
This dataset presents tephra layers, Ar-dates, age-model & stable isotope data from the >250 kyr-long Lake Chala sediment record, Kenya/Tanzania. The file is split into six tables: (1) metadata on the 30 tephra layers (29 visible tephra layers, one cryptotephra) studied to date, including sample and core codes, summary characteristics and ages; (2) summary of Ar-dating results on ten of the Lake Chala tephra layers; (3) the DCH_TephraAge Bayesian age model, which combines tephra, 210Pb and 14C age-estimates for the length of the core; (4) Raw single-grain WDS-EPMA results for all tephra layers studied in the DeepCHALLA sediment record; and (5) secondary standard data; (6) unpublished Diatom ?18O (‰ VSMOW), Bulk organic ?13C (‰), %C and Diatom d13C (‰) measurements for the full length of the core (given on a composite depth scale). These chronological data (Tables 1-5) are central to the reconstruction of palaeoclimate from a multi-proxy analyses of the Lake Chala sediment sequence and are included in publications by Baxter et al. (2023) and Martin-Jones et al. (2020, in review), for which references are given in the appropriate files. Stable isotope data (produced by Barker and Leng) remains unpublished at the time of upload. The data was generated by Catherine Martin-Jones, Christine Lane, Maarten Blaauw, Darren Mark, Melanie Leng and Phil Barker between 2017-2022. Much of the tephra data is published and references are provided.
Simple
- Date (Creation)
- 2023-08-07
- Citation identifier
- http://data.bgs.ac.uk/id/dataHolding/13608096
- Point of contact
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Organisation name Individual name Electronic mail address Role University of Cambridge
Christine Lane
not available
Originator British Geological Survey
Enquiries
not available
Distributor British Geological Survey
Enquiries
not available
Point of contact
- Maintenance and update frequency
- notApplicable
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GEMET - INSPIRE themes, version 1.0
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BGS Thesaurus of Geosciences
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Palaeoclimatology
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NGDC Deposited Data
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Potassium argon dating
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Volcanic ejecta
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Quaternary
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Age determination methods
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- dataCentre
- Keywords
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NERC_DDC
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- Access constraints
- Other restrictions
- Other constraints
- licenceOGL
- Use constraints
- Other restrictions
- Other constraints
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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
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There are no restrictions on the use that may be made of the dataset, although an appropriate copyright acknowledgement must be made when any part of the dataset is reproduced. Either no third party data / information is contained in the dataset or BGS has secured written permission from the owner of any third party data / information contained in the dataset to make the dataset freely available without any use constraints - inclusion of any third party data / information will affect the copyright acknowledgement that needs to be made.
- Language
- English
- Topic category
-
- Geoscientific information
- Begin date
- 2017-04-01
- End date
- 2022-09-26
Reference System Information
- Distribution format
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Name Version MS Excel
- Distributor contact
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Organisation name Individual name Electronic mail address Role British Geological Survey
Enquiries
not available
Distributor
- OnLine resource
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Protocol Linkage Name https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item181873 Data
- Hierarchy level
- Non geographic dataset
- Other
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non geographic dataset
Conformance result
- Title
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INSPIRE Implementing rules laying down technical arrangements for the interoperability and harmonisation of Geology
- Date (Publication)
- 2011
- Explanation
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See the referenced specification
- Pass
- No
Conformance result
- Title
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Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
- Date (Publication)
- 2010-12-08
- Explanation
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See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF
- Pass
- No
- Statement
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Tephra were detected / described visually and compositional data is single-glass shard WDS-EPMA, run at the University of Cambridge. Ar-dating was carried out on manually picked K-feldspars and samples irradiated in the CLICIT facility at Oregon State University using the Alder Creek sanidine as neutron fluence monitor. 40Ar/39Ar analyses then conducted at the SUERC National Environmental Isotope Facility, following standard protocols. Age-modelling in BACON (Blaauw and Christen, 2011) combines 210Pb & 14C dates from the 25 kyr-long CHALLACEA record (Blaauw et al., 2011) with in-situ Ar-ages and the age of the YTT tephra (Mark et al., 2017). Diatom O and C isotopes measured by mass spectrometry on purified diatom samples at the British Geological Survey (BGS, Keyworth) and Lancaster University, respectively. TOC and C isotopes measured using IRMS at BGS (Keyworth).
Metadata
- File identifier
- 027c26d1-c9a1-474e-e063-0937940a3586 XML
- Metadata language
- English
- Hierarchy level
- Non geographic dataset
- Hierarchy level name
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non geographic dataset
- Date stamp
- 2024-09-16
- Metadata standard name
- UK GEMINI
- Metadata standard version
-
2.3
- Metadata author
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Organisation name Individual name Electronic mail address Role British Geological Survey
Point of contact
- Dataset URI