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Sm-Nd Model Age (T2DM) Grid (felsic igneous rocks)
This is an interpolated grid of Nd two-stage model ages, based on whole-rock Nd isotopic analyses from felsic magmatic rocks, particularly focusing on I- and A-type granites and volcanic rocks. The data provides an estimate of the timing of extraction from the mantle of the middle to lower crustal source regions from which the felsic melts were generated. The point data used for the interpolation is the “felsic igneous rock” subset of the Sm-Nd data held in the Isotopic Atlas as of February 2021. Point data added to the Isotopic Atlas after February 2021 is not represented in this grid. The grid was generated with Esri's ArcMap Spatial Analyst interpolation tool using the Natural Neighbor algorithm and 0.01 degree cell size. Two classifications are provided for this grid; a Jenks natural breaks classification with ten classes (classification 1) as per Champion (2013) http://pid.geoscience.gov.au/dataset/ga/77772, and; the same nine-class interval binning and colour scheme applied to the source point data in the Sm-Nd Isotope Data layer (classification 2).
Simple
Identification info
- Status
Point of contact
- Spatial representation type
- Topic category
-
- Geoscientific information
Extent
Extent
))
- Maintenance and update frequency
- As needed
- Keywords (Theme)
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- Isotopes
- Geochronology
- Isotope Geochemistry
- Sm-Nd
- T2DM
- model age
- Keywords (Place)
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- Earth Science
- Australian and New Zealand Standard Research Classification (ANZSRC): Fields of Research
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- Earth Sciences
Resource constraints
- Access constraints
- Other restrictions
- Other constraints
- © Commonwealth of Australia (Geoscience Australia) 2021. This product is released under the Creative Commons Attribution 4.0 International Licence
Resource constraints
- Use limitation
- https://creativecommons.org/licenses/by/4.0
- Access constraints
- Licence Unrestricted
- Use constraints
- Licence Unrestricted
- Language
- English
- Character encoding
- UTF8
Distribution Information
- OnLine resource
-
isotope:smnd_t2dm_grid
Sm-Nd Model Age (T2DM) Grid (felsic igneous rocks)
Resource lineage
- Hierarchy level
- Dataset
Reference System Information
- Reference system identifier
- EPSG:4283
Reference System Information
- Reference system identifier
- CRS:84
Metadata
- Metadata identifier
- urn:uuid/b2b6458693f070a55d631bba59b3413853780b0c
- Language
- English
- Character encoding
- anyValidURI
Point of contact
Point of contact
Type of resource
- Resource scope
- Dataset
- Metadata linkage
- https://portal.auscope.org.au/geonetwork/srv/eng/catalog.search#/metadata/b2b6458693f070a55d631bba59b3413853780b0c
- Date info (Revision)
- 2023-08-18T07:39:05
- Date info (Creation)
- 2022-11-11T02:24:59
Metadata standard
- Title
- ISO 19115-3
Overviews
Spatial extent
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