CEAMARC marine sediment samples
Entry ID: CEAMARC-200708_V3_MARINE_SEDIMENT_SAMPLES

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Summary
Abstract: Marine sediment samples were obtained from box corer, Smith-MacIntyre and Van Veen grabs.

Samples were named by:
1. CEAMARC site (e.g. 16)
2. Instrument (e.g. box corer = BC; Smith-MacIntyre = GRSM; Van Veen = GRVV) 3. Sequence of sample at each site (e.g. first sample = 01; second sample = 02) So 16BC02 is the second sample at CEAMARC site 16, using the box corer.

From each successful sample, a sub-sample was obtained:
1. 200 g surface scrape (labelled A)
2. short (20 cm) push core (labelled B)
3. bulk (labelled Bulk)
4. rocks-only (labelled Rocks)
e.g. 16BC02A is a 200 g surface scrape subsample from 16BC02.
16BC02B is a push core subsample from 16BC02
16BC02Bulk is a bulk sediment subsample from 16BC02.
16BC02Rocks is a rocks-only subsample from 16BC02.

Post-cruise analyses:
1. Grain size
2. Total organic carbon
3. Total organic nitrogen
4. Carbon and nitrogen isotopes
5. Biogenic silica and carbonate
6. Physical properties of cores
7. Zircon dating
8. X-rays for infauna and sedimentary structures

Added by Alix Post - March 2010:

Seabed samples were collected from 52 sites across the George V Shelf. Most samples were collected with a box corer (BC), though more gravelly sediments required a Smith-McIntyre (GRSM) or Van-Veen grab (GRVV) as indicated by the station name in the spreadsheet. A small volume of sediment was frozen following collection and later analysed for organic carbon and nitrogen content, in addition to carbon and nitrogen isotopes. Organic carbon and nitrogen values are express as percent of the total sediment, and have been corrected back to the total sediment volume. Isotopic values are expressed as values per mil.

Where sufficient volume of sediment was collected, a mini-core was pushed into the sediment to provide a depth profile of the sample, and a bulk surface sample was also taken. Surface sediment samples analysed for sieve grainsize, calcium carbonate and biogenic silica content. All values are expressed as percentage values. The naming convention of the samples describes the type of gear used and the nature of the sediment analysed: e.g. 01BC01Bulk is a bulk sediment sample collected with a box core; 38GRVV02B/0-1 is a slice taken from 0 to 1 cm at the top of a van veen grab.

Related URL
Link: GET DATA
Description: Download point for the data at the Australian Antarctic Data Centre


Link: GET DATA
Description: Access point for Geoscience Australia's Marine Sediments Database


Link: VIEW PROJECT HOME PAGE
Description: Public information for ASAC project 2201


Link: VIEW RELATED INFORMATION
Description: Citation reference for this metadata record and dataset.


Parent DIF
This data set description is a member of a collection. The collection is described in
ASAC_2201


Geographic Coverage
 N: -65.812 S: -67.051  E: 145.333  W: 139.333

Temporal Coverage
Start Date: 2007-12-23
Stop Date: 2008-01-17


Location Keywords
OCEAN > SOUTHERN OCEAN
GEOGRAPHIC REGION > POLAR


Data Resolution
Latitude Resolution: 0.0001 degree or 11.1 metres
Longitude Resolution: 0.0001 degree or 11.1 metres
Vertical Resolution: 5 metres
Temporal Resolution: 1 min


Science Keywords
OCEANS >MARINE SEDIMENTS >GEOTECHNICAL PROPERTIES    [Definition]
OCEANS >MARINE SEDIMENTS >SEDIMENT COMPOSITION    [Definition]
OCEANS >MARINE SEDIMENTS    [Definition]
OCEANS >MARINE SEDIMENTS >SEDIMENT CHEMISTRY    [Definition]
BIOSPHERE >AQUATIC ECOSYSTEMS >BENTHIC HABITAT    [Definition]


ISO Topic Category
GEOSCIENTIFIC INFORMATION
OCEANS


Platform
SHIPS    [Information]


Instrument
GRAB SAMPLERS    [Information]
SEDIMENT CORERS    [Information]
GAS CHROMATOGRAPHS    [Information]
MASS SPECTROMETERS    [Information]


Quality
Data quality is good for all sediment records.

Tin-wrapped samples are loaded into carousels with 49 samples in each tray and 3 trays making up a full run of 147 samples. The carousels are placed on an AS200 autosampler that drops a sample in response to a pulse of compressed air. Gases are swept through the columns and GC by an approximately 100 ml min-1 flow of high purity helium. The sample dropper uses a sliding port that maintains the approximately 1 atmosphere pressure of the helium required to force the gases through the columns and GC.
The autosampler sits on top of a Carlo Erba CE1110 CHN-S analyser containing the two furnaces, the scrubber and the GC (Gas Chromatograph). After the GC in the gas stream sits a TCD (Thermal Conductivity Detector) which is used to measure peak area when the machine is used as an elemental analyser. The samples are dropped into the left-hand furnace which is the oxidising furnace and is maintained at 1050 degrees C. It consists of a silica glass tube filled with chromium oxide to the midpoint, with cobaltous silver oxide under it. A tube takes the carrier gas from the bottom of this reactor to the second, reducing furnace tube which the mixed gases flow up through. The second silica glass tube is filled with metallic copper pellets and is kept at 660 degrees C. The gases flow out of the top of this tube and through a scrubber filled with magnesium perchlorate to absorb all water vapour. The dried gases then pass through a packed GC consisting of a 1/4" stainless steel tube with Porapak QS 50-80 mesh. This is held at about 25 degrees C. Nitrogen gas exits from the GC, followed by carbon dioxide after about one minute. These flow to an open split where they are sucked into the mass spectrometer through a 75 micro silica capillary.
The gas pulses, still mixed with the helium carrier, flow into the Fisons Isochrom CF-IRMS (Continuous-flow Isotope Ratio Mass Spectrometer) where their isotopic compositions are determined.

Surface sediment samples were analysed to determine the gravel, sand and mud content by washing through 2 mm and 63 micron sieves. The less than 2 mm fraction was also analysed for laser particle size. Carbonate content was determined on the bulk material as well as the mud and sand fractions using the carbonate bomb method (Muller and Gastner, 1971). The carbonate content of the gravel fraction was determined by visual analysis. The biogenic silica content of the bulk sediment was measured based on the method of Mortlock and Froelich (1989). Muller, G., Gastner, M., 1971. The "Karbonat-Bombe," a simple device for the determination of the carbonate content in sediments, soils and other materials. Neues Jahrbuch fur Mineralogie, Monatshefte 10, 466-469. Mortlock, R.A., Froelich, P.N., 1989. A simple method for the rapid determination of biogenic opal in pelagic marine sediments. Deep Sea Research 36, 1415-1426.


Access Constraints
These data are publicly available for download from the provided URLs. Contact the investigators for permission to use the data.

The dataset contains two excel spreadsheets detailing the sediment isotopes and the grainsize compositions, plus a pdf which provides further information about the laser grainsize data.

Furthermore a link to Geoscience Australia's Marine Sediments Database is included. Data can also be found here.


Use Constraints
This data set conforms to the PICCCBY Attribution License
(http://creativecommons.org/licenses/by/3.0/).

Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=CEAMARC-... when using these data.


Keywords
sediment samples
surface sediment
grainsize
calcium carbonate
biogenic silica
grab sample
box core sample
box core
van veen grab
smith-mcintyre grab
sieves
laser particle sizer
organic carbon
nitrogen
carbon isotopes
nitrogen isotopes
high-temperature oxidation column


Data Set Progress
COMPLETE


Data Center
Australian Antarctic Data Centre, Australia    [Information]
Data Center URL: http://data.aad.gov.au

Data Center Personnel
Name: DATA OFFICER AADC
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: metadata at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia



Distribution
Distribution_Media: HTTP
Distribution_Size: 677 kb
Distribution_Format: excel, pdf
Fees: Free


Personnel
PHILIP EDWARD O'BRIEN
Role: INVESTIGATOR
Role: TECHNICAL CONTACT
Email: phil.obrien.ant at gmail.com


ROBIN JORDAN BEAMAN
Role: INVESTIGATOR
Role: TECHNICAL CONTACT
Phone: +61 7 4042 1693
Fax: +61 7 4042 1284
Email: robin.beaman at jcu.edu.au
Contact Address:
James Cook University PO Box 6811
City: Cairns
Province or State: QLD
Postal Code: 4870
Country: Australia


ALIX POST
Role: INVESTIGATOR
Role: TECHNICAL CONTACT
Phone: +61 2 6249 9023
Email: alix.post at ga.gov.au
Contact Address:
Geoscience Australia
Corner of Jerrabomberra Av. and Hindmarsh Drv.,
GPO Box 378
City: Symonston
Province or State: Australian Capital Territory
Postal Code: 2609
Country: Australia


JUNHONG CHEN
Role: TECHNICAL CONTACT
Phone: +61 2 6249 9202
Email: junhong.chen at ga.gov.au
Contact Address:
Geoscience Australia
Corner of Jerrabomberra Av. and Hindmarsh Drv.,
GPO Box 378
City: Symonston
Province or State: Australian Capital Territory
Postal Code: 2609
Country: Australia


CHRISTIAN THUN
Role: TECHNICAL CONTACT
Phone: +61 2 6249 9557
Email: christian.thun at ga.gov.au
Contact Address:
Geoscience Australia
Corner of Jerrabomberra Av. and Hindmarsh Drv.,
GPO Box 378
City: Symonston
Province or State: Australian Capital Territory
Postal Code: 2609
Country: Australia


DAVE J. CONNELL
Role: DIF AUTHOR
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: dave.connell at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia



Creation and Review Dates
DIF Creation Date: 2008-02-24
Last DIF Revision Date: 2014-09-11

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