Late Eocene microspherule count and foraminifera multispecies oxygen and carbon stable isotope data from DSDP Site 94
Twenty-six 10 cm3 samples from DSDP (Deep Sea Drilling Project) Site 94, Core 15, sections 3 and 4 were examined at 10 cm-intervals (417.84-415.01 meters below seafloor [mbsf]). The sedimentary material was soaked in distilled water and washed under running water through a 63 µm sieve and oven dried at <40 degrees C. Samples were then re-washed and dried using the same method. Foraminifera are abundant and recystallised. Calcite precipitation is observed on microspherules in some samples. For each sample, a total of three foraminiferal species that correspond to different ecological habitats were selected for isotope analysis. Specimens of Pseudohastigerina micra and P. naguewichiensis were selected from the 125-250 µm size fraction and Turborotalia cocoaensis, and Cibicidoides eocaenus were selected from the >250 µm size fraction. Specimens that had infilling or showed heavy calcification were avoided. All foraminifera were ultrasonicated for 2 seconds prior to isotopic analyses. To track the number of impact microspherules across the sampled interval, we performed our own microspherules count from the >125 micron size fraction. Microtektites have not been distinguished from microkrystites in this study and thus all recovered spherules should be considered under the broader category of microspherules (both microtektites and crystalline-bearing microkrystites). We recovered a total of 4999 microspherules from the 26 samples. Microspherules are usually <1 mm in size, and occur primarily spherical, although ellipsoid, teardrop and dumbbell forms and fragments have also been found. In most samples the microspherules count is low <50 microspherules. We found a high abundance (>50 microspherules/10 cm3) between samples 15R/3/135-137 cm and 15R/3/89-91 cm (416.36 to 415.90 mbsf). Our peak concentration of microspherules at 15R/3/109-111 cm (416.10 mbsf), where 3395 microspherules were recovered, coincides with the younger of the two late Eocene impacts i.e., the North America microtektite horizon associated with the Chesapeake Bay impact.
Simple
- Date (Creation)
- 2024-10-13
- Citation identifier
- http://data.bgs.ac.uk/id/dataHolding/13608286
- Point of contact
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Organisation name Individual name Electronic mail address Role University College London
Professor Bridget Wade
not available
Originator University College London
Natalie Cheng
not available
Originator British Geological Survey
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Distributor British Geological Survey
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- 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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Tektites
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NGDC Deposited Data
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Eocene
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Foraminifera
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Stable isotopes
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- dataCentre
- Keywords
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NERC_DDC
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- Access constraints
- Other restrictions
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- licenceOGL
- Use constraints
- Other restrictions
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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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Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]"
- Language
- English
- Topic category
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- Geoscientific information
- Begin date
- 2018-01-25
- End date
- 2024-04-03
Reference System Information
- Distribution format
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Name Version MS Excel
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Organisation name Individual name Electronic mail address Role British Geological Survey
Enquiries
not available
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- OnLine resource
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Protocol Linkage Name https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item186339 Data
- OnLine resource
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Protocol Linkage Name https://doi.org/10.5285/a0b6a773-1d18-4ced-a57e-06f8d67428b9 Digital Object Identifier (DOI)
- 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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Foraminifera were analysed at the Bloomsbury Environmental Isotope Facility (BEIF) at University College London on a Thermo DeltaPLUS XP continuous-flow Gas-ratio mass spectrometer attached to a Thermo Gas Bench II device. Precision of all internal (BDH) and external standards (NBS-19) is ±0.06‰ for δ13C and ±0.10‰ for δ18O for the planktonic foraminiferal samples, and ±0.02‰ for δ13C and ±0.06‰ for δ18O for the benthic foraminiferal samples. All isotope values are normalised to NBS-19 and reported in per mil in the δ notation relative to the Vienna Pee Dee Belemnite (VPDB).
Metadata
- File identifier
- 24837f60-a965-206c-e063-0937940a75a1 XML
- Metadata language
- English
- Hierarchy level
- Non geographic dataset
- Hierarchy level name
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non geographic dataset
- Date stamp
- 2024-11-05
- Metadata standard name
- UK GEMINI
- Metadata standard version
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2.3
- Metadata author
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Organisation name Individual name Electronic mail address Role British Geological Survey
Point of contact
- Dataset URI