Date ( Publication )

2016-06

Identifier

http://data.bgs.ac.uk/id/dataHolding/13607029

Maintenance and update frequency

notApplicable notApplicable

GEMET - INSPIRE themes

• Geology

BGS Thesaurus of Geosciences

• Climatology , Quaternary , Palaeoecology , Holocene

Keywords

• NERC_DDC

Access constraints

otherRestrictions Other restrictions

Use constraints

otherRestrictions Other restrictions

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]"

Metadata language

English English

Topic category

• Geoscientific information

Geographic identifier

ANDES [id=842000]

 

Date ( Creation )

1979

Geographic identifier

BO

 

Date ( Revision )

2009

Geographic identifier

BOL

 

Date ( Revision )

2009

Geographic identifier

BOLIVIA [id=867000]

 

Date ( Creation )

1979

Geographic identifier

EC

 

Date ( Revision )

2009

Geographic identifier

ECU

 

Date ( Revision )

2009

Geographic identifier

ECUADOR [id=863000]

 

Date ( Creation )

1979

Geographic identifier

PE

 

Date ( Revision )

2009

Geographic identifier

PER

 

Date ( Revision )

2009

Geographic identifier

PERU [id=864000]

 

Date ( Creation )

1979

N

S

E

W

Supplemental Information

NERC grant NE/J018562/1. This grant is linked to NERC studentship grant NE/J500288/1, see metadata entry 13606924.

Distribution format

• ()

OnLine resource

https://dx.doi.org/10.5194/cp-12-1263-2016  

OnLine resource

http://www.bgs.ac.uk/services/ngdc/accessions/index.html#item73130  

Hierarchy level

dataset Dataset

Other

dataset

Statement

Collection of the sedimentary archives (field work to Ecuador). The recovery of the sediments was performed from a wooded platform on the lakes supported in inflatable boats using a Livingstone corer. - Storage in a cold room based at the Open University (UK) until splitting the cores. - Subsampling the cores using a syringe of 1cc volume. LAB TREATMENT FOR PALYNOLOGICAL ANALYSES (proxies analysed: pollen ,non-pollen palynomorphs, and microcharcoal) - Acid digestion using hot: KOH at 10%, Na4P2O7 at 2.66%, HCl at 10%, HF at 40%, and acetolisis mixture (mix of (CH3CO)2O at 97% and H2SO4 at 95-98% in a proportion of 9:1). Palynological residues obtained from the treatment were mounted in glycerine. LAB TREATMENT FOR CHIRONOMIDS ANALYSIS - Disaggregation of the sediment using hot KOH at 10% - Dehydration of the chironomids head capsules by sequential imbibition using: ethanol (80%), ethanol (100%), and euparal essence. Final mounting in slides using euparal. LAB TREATMENT FOR STABLE ISOTOPES ANALYSIS - Drying of samples at 40ºC - Crushing of the dried sediments to a fine powder - Decalcification: add 0.1M and 1.0M of HCl; dry samples overnight at 40ºC, and transfer the samples to Sn capsules for the analysis LAB TREATMENT FOR XRF ANALYSIS - Drying of samples overnight at 110 °C - Crushing of the dried sediments to a fine powder - Loss-on-ignition was performed on 1.2 g of the powdered sub-sample; the sub-sample was ignited for one hour in a furnace set at 1000 °C - Glass discs were then created using 0.7000 g of the remaining powdered sub-sample and 3.6300 g of lithium metaborate flux - The powder/flux mix was then placed into a muffle furnace at 1100 °C for 20 minutes in order to melt the mixture - When homogenised, the melt was poured into a heated brass mould and a plunger was pressed down steadily, forming the glass disc - The samples (in glass discs) were analysed on an ARL 8420+ dual goniometer wavelength dispersive XRF spectrometer.

gmd:MD_Metadata

File identifier

4064b9bb-e765-38d9-e054-002128a47908   XML

Metadata language

English English

Hierarchy level

dataset Dataset

Date stamp

2021-02-25

Metadata standard version

2.3

Dataset URI

http://data.bgs.ac.uk/id/dataHolding/13607029