http://lod.bco-dmo.org/id/dataset/819793
eng; USA
utf8
dataset
Highest level of data collection, from a common set of sensors or instrumentation, usually within the same research project
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
2020-07-29
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Thallium isotope data from a Cretaceous Oceanic Anoxic Event
2020-07-29
publication
2020-07-29
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2020-08-13
publication
https://doi.org/10.26008/1912/bco-dmo.819793.1
Jeremy D. Owens
Florida State University
principalInvestigator
Sune G. Nielsen
Woods Hole Oceanographic Institution
principalInvestigator
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
publisher
Cite this dataset as: Owens, J., Nielsen, S. (2020) Thallium isotope data from a Cretaceous Oceanic Anoxic Event. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2020-07-29 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.819793.1 [access date]
Thallium isotope data from a Cretaceous Oceanic Anoxic Event Dataset Description: <p>This thallium isotope dataset from a Cretaceous Oceanic Anoxic Event constrains the magnitude and timing of oceanic deoxygenation.</p> Methods and Sampling: <p><strong>Methodology:</strong><br />
Approximately 50 to 100 mg of sediment were initially treated with 3 ml of 2 M HNO₃ and heated at 130°C for ~12 h to chemically separate the authigenic and detrital fraction of Tl. This treatment dissolves pyrite, which is thought to contain the authigenic Tl fraction, while the undissolved portion is dominated by silicate minerals. The two sample fractions were then separated via three cycles of centrifugation, pipetting off the supernatant (henceforth termed 'the authigenic fraction') and rinsing in MQ water. After separation of the authigenic and silicate fractions, both fractions were digested separately in the HPA using ~3 ml of concentrated nitric and ~3 ml of concentrated hydrochloric acid in order to break down organic molecules. After the HPA digestion, authigenic fractions were prepared for anion exchange separation of Tl from the sample matrix; no hydrofluoric acid treatment was used on the authigenic fraction, thereby reducing possible Tl contributions from silicates. Residual silicates were dissolved using a hydrofluoric/nitric acid mixture and then prepared for anion exchange separation (henceforth termed 'the silicate fraction') for thallium purification.</p>
<p><strong>Sampling and analytical procedures:</strong><br />
Thallium Purification: Thallium was isolated from a sample matrix using previously described anion exchange chromatography techniques. Briefly, thallium purification was accomplished using two separate columns, one large and one micro-column, using AG1X8 anion exchange resin from Biorad. The two columns quantitatively remove lead (Pb) from the sample, which is required to monitor mass-bias during mass spectrometric analysis. NIST SRM 981 Pb is added to every sample to monitor for instrumental mass bias. In addition, this allows for determination of Tl concentrations during isotopic analysis because the yield of the Tl column chemistry is within error of 100%. However, only one column was used during Tl purification. Testing of standards and samples showed that there was no difference in concentration or isotope composition between samples that had been processed through one or two columns.</p>
<p>Isotope Instrumental Configuration: Samples were analyzed for Tl isotopic compositions using a Thermo Scientific Neptune multi-collector inductively-coupled-plasma mass spectrometer (MC-ICP-MS) located in the WHOI Plasma Facility. Measurement were performed using low resolution with jet sample and Ni X-skimmer cones coupled with a dry plasma inlet system with Aridus II desolvator (CETAC Technologies).</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1434785 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1434785
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1624895 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1624895
completed
Jeremy D. Owens
Florida State University
850-644-5018
1800 E. Paul Dirac Drive
Tallahassee
FL
32310
USA
jdowens@fsu.edu
pointOfContact
Sune G. Nielsen
Woods Hole Oceanographic Institution
CRPG, CNRS, Université de Lorraine 15 rue Notre Dame des Pauvres
54501 Vandoeuvre lès Nancy
France
sune.nielsen@univ-lorraine.fr
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Sample
Depth
TI
f_authigenic
E205TI_authigenic
two_sd_E205TI_authigenic
n_E205TI_authigenic
E205TI_detrital
two_sd_E205TI_detrital
n_E205TI_detrital
Thermo Neptune multi-collector ICP-MS
theme
None, User defined
sample identification
depth below seafloor
No BCO-DMO term
numb_obs
featureType
BCO-DMO Standard Parameters
Inductively Coupled Plasma Mass Spectrometer
instrument
BCO-DMO Standard Instruments
otherRestrictions
otherRestrictions
Access Constraints: none. Use Constraints: Please follow guidelines at: http://www.bco-dmo.org/terms-use Distribution liability: Under no circumstances shall BCO-DMO be liable for any direct, incidental, special, consequential, indirect, or punitive damages that result from the use of, or the inability to use, the materials in this data submission. If you are dissatisfied with any materials in this data submission your sole and exclusive remedy is to discontinue use.
Fingerprinting and Calibrating Low Oxygen Conditions Using Vanadium Isotopes
https://osprey.bco-dmo.org/project/775701
Fingerprinting and Calibrating Low Oxygen Conditions Using Vanadium Isotopes
<p><em>NSF Award Abstract:</em><br />
Discovering, testing, and developing chemical proxies (relic materials) in marine sediments that reveal how strongly or weakly oxidizing near-surface environmental conditions were in the Earth's geological past are immensely important for understanding interactions between ocean chemistry, biological evolution and extinctions, and climate. To date scientists do not have a proxy for low but non-zero oxygen conditions -- the sort of conditions that are likely to have dominated in biologically important periods of Earth history. In this project, researchers will study the relationship between bottom water oxygen concentration and the isotopes of the trace metal vanadium (V) in a range of oxygen conditions in the modern ocean. Based on pilot data, theoretical calculations and dissolved seawater V concentrations they believe that stable V isotope ratios of core top sediments will correlate systematically over a range of bottom water oxygen conditions. By analyzing these materials, the research team expects to establish the relationship between V isotopes and bottom water oxygen concentrations. Given the importance of chemical proxies to quantify past climate change, the results of this study will be of great importance to the modern and paleoceanographic community, as well as for modelers to better understand a broad range of oxygen variability in Earth history.</p>
<p>Although recent investigations have provided a wealth of information about the redox conditions of the ancient oceans, there is a significant gap in understanding low oxygen conditions throughout Earth history. Therefore, it is important to develop new paleoredox proxies that can provide additional and complementary knowledge about ocean redox conditions during these important periods of Earth history. In this study, scientists will analyze bulk sediments and their organic and ferromanganese mineral fractions to investigate the V isotopic variability within the various sedimentary components. (These samples comprise organic rich to ferromanganese rich sediments due to a range in bottom water oxygen concentrations.) Reconstructing marine low oxygen conditions using vanadium isotopes would fill a void in the paleoredox proxy toolbox. Developing, calibrating, and fingerprinting the V isotopic variability in modern sediments is required to be able to apply vanadium isotopes as an accurate paleoredox proxy.</p>
Vanadium Isotopes
largerWorkCitation
project
eng; USA
oceans
2020-07-29
0
BCO-DMO catalogue of parameters from Thallium isotope data from a Cretaceous Oceanic Anoxic Event
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
http://lod.bco-dmo.org/id/dataset-parameter/819811.rdf
Name: Sample
Units: unitless
Description: <p>Ocean drilling program naming scheme: leg-site(hole), core(half)-section depth</p>
http://lod.bco-dmo.org/id/dataset-parameter/819812.rdf
Name: Depth
Units: meters (m)
Description: <p>Meters composite depth (mcd – spliced sections) below seafloor</p>
http://lod.bco-dmo.org/id/dataset-parameter/819813.rdf
Name: TI
Units: parts per million (ppm)
Description: <p>Bulk thallium concentration</p>
http://lod.bco-dmo.org/id/dataset-parameter/819814.rdf
Name: f_authigenic
Units: unitless
Description: <p>Authigenic fraction of bulk value</p>
http://lod.bco-dmo.org/id/dataset-parameter/819815.rdf
Name: E205TI_authigenic
Units: epsilon units
Description: <p>Measured Tl isotope value from authigenic fraction</p>
http://lod.bco-dmo.org/id/dataset-parameter/819816.rdf
Name: two_sd_E205TI_authigenic
Units: epsilon units
Description: <p>2 standard deviation error from all authigenic analysis</p>
http://lod.bco-dmo.org/id/dataset-parameter/819817.rdf
Name: n_E205TI_authigenic
Units: unitless
Description: <p>Number of authigenic isotope analysis. * signifies multiple powder digestions for the same sample.</p>
http://lod.bco-dmo.org/id/dataset-parameter/819818.rdf
Name: E205TI_detrital
Units: epsilon units
Description: <p>Measured Tl isotope value from detrital fraction</p>
http://lod.bco-dmo.org/id/dataset-parameter/819819.rdf
Name: two_sd_E205TI_detrital
Units: epsilon units
Description: <p>2 standard deviation error from all detrital analysis</p>
http://lod.bco-dmo.org/id/dataset-parameter/819820.rdf
Name: n_E205TI_detrital
Units: unitless
Description: <p>Number of detrital isotope analysis. * signifies multiple powder digestions for the same sample.</p>
GB/NERC/BODC > British Oceanographic Data Centre, Natural Environment Research Council, United Kingdom
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
2612
https://darchive.mblwhoilibrary.org/bitstream/1912/26068/1/dataset-819793_thallium-isotopes__v1.tsv
download
https://doi.org/10.26008/1912/bco-dmo.819793.1
download
onLine
dataset
<p><strong>Methodology:</strong><br />
Approximately 50 to 100 mg of sediment were initially treated with 3 ml of 2 M HNO₃ and heated at 130°C for ~12 h to chemically separate the authigenic and detrital fraction of Tl. This treatment dissolves pyrite, which is thought to contain the authigenic Tl fraction, while the undissolved portion is dominated by silicate minerals. The two sample fractions were then separated via three cycles of centrifugation, pipetting off the supernatant (henceforth termed 'the authigenic fraction') and rinsing in MQ water. After separation of the authigenic and silicate fractions, both fractions were digested separately in the HPA using ~3 ml of concentrated nitric and ~3 ml of concentrated hydrochloric acid in order to break down organic molecules. After the HPA digestion, authigenic fractions were prepared for anion exchange separation of Tl from the sample matrix; no hydrofluoric acid treatment was used on the authigenic fraction, thereby reducing possible Tl contributions from silicates. Residual silicates were dissolved using a hydrofluoric/nitric acid mixture and then prepared for anion exchange separation (henceforth termed 'the silicate fraction') for thallium purification.</p>
<p><strong>Sampling and analytical procedures:</strong><br />
Thallium Purification: Thallium was isolated from a sample matrix using previously described anion exchange chromatography techniques. Briefly, thallium purification was accomplished using two separate columns, one large and one micro-column, using AG1X8 anion exchange resin from Biorad. The two columns quantitatively remove lead (Pb) from the sample, which is required to monitor mass-bias during mass spectrometric analysis. NIST SRM 981 Pb is added to every sample to monitor for instrumental mass bias. In addition, this allows for determination of Tl concentrations during isotopic analysis because the yield of the Tl column chemistry is within error of 100%. However, only one column was used during Tl purification. Testing of standards and samples showed that there was no difference in concentration or isotope composition between samples that had been processed through one or two columns.</p>
<p>Isotope Instrumental Configuration: Samples were analyzed for Tl isotopic compositions using a Thermo Scientific Neptune multi-collector inductively-coupled-plasma mass spectrometer (MC-ICP-MS) located in the WHOI Plasma Facility. Measurement were performed using low resolution with jet sample and Ni X-skimmer cones coupled with a dry plasma inlet system with Aridus II desolvator (CETAC Technologies).</p>
Specified by the Principal Investigator(s)
<p><strong>Data processing:</strong><br />
Thallium isotope analyses utilize standard sample bracketing as well as external normalization to the added SRM NIST 981 Pb. Thallium isotope compositions are reported relative to NIST SRM 997. Thallium isotopic data are reported in ε notation relative to NIST 997 as ε²⁰⁵Tl = [(<sup>205/203</sup>Tl<sub>sample</sub>) / (<sup>205/203</sup>Tl<sub>NIST997</sub>) – 1] × 10,000. The authigenic fraction of SCo-1 yielded a mean Tl-isotope composition of ε²⁰⁵Tl = 3.0 ± 0.2 and Tl concentration of 214 ± 74 pg/g (n = 18) with sample dissolutions and measurements. Previously described techniques that used both external normalization to NIST SRM (Standard Reference Materials) 981 Pb and standard-sample bracketing were applied for mass bias correction. Because of the quantitative yields of Tl from the column chemistry procedure, Tl concentrations were determined by monitoring the ²⁰⁵Tl signal intensities of the samples during the isotopic measurements. A known quantity of NIST SRM 981 Pb was added to the sample Tl, and the measured ²⁰⁵Tl/²⁰⁸Pb ratios were then converted directly into Tl abundances. The U.S. Geological Survey (USGS) shale standard SCO-1 was processed and analyzed, with each sample set to monitor long-term precision and accuracy of our Tl isotope data (average calculated ε²⁰⁵Tl = −2.64 ± 0.24), and was found to be better than most recent Tl isotope studies, which have 2-SD uncertainties of ~0.3 to 0.5 ε²⁰⁵Tl units.</p>
<p><strong>BCO-DMO Processing:</strong><br />
- modified parameter names;<br />
- replaced dashes with "nd" (no data).</p>
Specified by the Principal Investigator(s)
asNeeded
7.x-1.1
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
Thermo Neptune multi-collector ICP-MS
Thermo Neptune multi-collector ICP-MS
PI Supplied Instrument Name: Thermo Neptune multi-collector ICP-MS Instrument Name: Inductively Coupled Plasma Mass Spectrometer Instrument Short Name:ICP Mass Spec Instrument Description: An ICP Mass Spec is an instrument that passes nebulized samples into an inductively-coupled gas plasma (8-10000 K) where they are atomized and ionized. Ions of specific mass-to-charge ratios are quantified in a quadrupole mass spectrometer. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB15/