Name: Mud_Fraction_Organic_Isotopes_Specific_Surface_Area
Display Field: GA_Sample_ID
Type: Feature Layer
Geometry Type: esriGeometryPoint
Description: This data layer comprise organic carbon and nitrogen concentrations and isotopes and specific surface areas of the mud fraction (less than 63 um) of the upper 2 cm of seabed sediments.
Bottom sediments were collected using either a Smith McIntyre grab or Box Core. The upper ~0-2 cm of seabed sediment was spooned into a bag for the purpose of grainsize analysis. The less than 63um sieve fraction was freeze-dried, ground in a tungsten carbide mill and decarbonated. The decarbonated powders were sent to Environmental Isotopes Pty Ltd (Sydney) for isotopic analysis by mass spectrometry. Samples were back-corrected to account for the carbonate removal, using carbonate concentrations derived from the bomb method. Specific surface areas were determined using a 5-point Brunauer-Emmett-Teller (BET) adsorption isotherm on a Quantachrome NOVA 2200e analyser, with nitrogen used as the adsorbate. The samples were first cleaned of organic matter by slow heating for 12 hours to 350oC. Error estimates for the C and N isotope values are ±0.15. The carbonate measurements (used to back correct) were better than 5%. The average RSD of the specific surface area measurements was 7.5%.
Definition Expression: N/A
Copyright Text: © Commonwealth of Australia (Geoscience Australia) 2016. This product is released under the Creative Commons Attribution 4.0 International Licence. http://creativecommons.org/licenses/by/4.0/legalcode
Default Visibility: true
MaxRecordCount: 1000
Supported Query Formats: JSON, AMF
Min Scale: 0
Max Scale: 0
Supports Advanced Queries: true
Supports Statistics: true
Has Labels: false
Can Modify Layer: false
Can Scale Symbols: false
Use Standardized Queries: true
Extent:
XMin: 126.91210000000001
YMin: -12.217829999999935
XMax: 127.45223300000009
YMax: -11.328349999999944
Spatial Reference:
4326
(4326)
Drawing Info:
Renderer:
Simple Renderer:
Symbol:
Style: esriSMSCircle
Color:
[136, 148, 0, 255]
Size: 4.0
Angle: 0.0
XOffset: 0
YOffset: 0
Outline:
Label: Mud Fraction Organics, Isotopes and Specific Surface Areas
Description:
Transparency: 0
Labeling Info:
HasZ: false
HasM: false
Has Attachments: false
HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText
Type ID Field: null
Fields:
-
OBJECTID
(
type: esriFieldTypeOID
,
alias: OBJECTID
)
-
GA_Sample_number
(
type: esriFieldTypeDouble
,
alias: GA_Sample_number
)
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GA_Sample_ID
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type: esriFieldTypeString
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alias: GA_Sample_ID
,
length: 255
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Sample_type
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type: esriFieldTypeString
,
alias: Sample_type
,
length: 255
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Longitude
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type: esriFieldTypeDouble
,
alias: Longitude
)
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Latitude
(
type: esriFieldTypeDouble
,
alias: Latitude
)
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TOC
(
type: esriFieldTypeDouble
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alias: TOC
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-
TN
(
type: esriFieldTypeDouble
,
alias: TN
)
-
Shape
(
type: esriFieldTypeGeometry
,
alias: Shape
)
-
Water_depth_m
(
type: esriFieldTypeDouble
,
alias: Water_depth_m
)
-
Sediment_depth__cm
(
type: esriFieldTypeString
,
alias: Sediment_depth_cm
,
length: 255
)
-
d15N
(
type: esriFieldTypeDouble
,
alias: d15N
)
-
d13C
(
type: esriFieldTypeDouble
,
alias: d13C
)
-
Surface_area__m²_g
(
type: esriFieldTypeDouble
,
alias: Surface_area__m²_g
)
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