Data · collection
Geological mapping and geochemical and geochronological analysis of anomalous plutonic rocks in the Koettlitz Walcott Glacier and Skelton-Glacier and Hoopers Crags area
Listed in NASA Earthdata CMR
The Ross Orogeny refers to the collision event when East and West Antarctica met, resulting in subduction with associated deformation, crustal thickening, metamorphism and igneous activity.
Description
In the Dry Valleys area metamorphic basement rocks are intruded by large plutons of granite. However, further south magmatic rocks are highly varied.
The occurrence of nepheline syenites and associated carbonatites is unusual as these rocks are associated with crust that is being pulled apart and stretched, not near subduction zone as is associated with the Ross Orogeny. The extent of the anomalous plutonic rock types in the Koettlitz-Walcott Glacier area (ridge system southeast of Dismal Ridge) and the Skelton-Glacier and Hoopers Crag area were sampled for detailed geochemical and geochronological analysis and the area was geologically mapped to determine the extent of the anomalous syenitic plutons.
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The rock type and its distribution was plotted onto an existing topographic base map. The location of outcrops was facilitated by using aerial photographs, an altimeter and a GPS set. Representative samples were collected for laboratory based geochemical and geochronology analysis.
Rocks were thin sectioned and examined petrographically to determine their mineralogy and suitability for chemical analysis. Minerals unidentified by petrography were determined by x-ray diffractions or electron microprobe analysis and further analysed by x-ray fluorescence to determine its chemical composition. The rocks identified by these techniques were analysed by radiometric dating (U-Pb).
All data was used to provide a history of tectonic, metamorphic and magmatic events during the Ross Orogeny.
Links
Get the data
- pet.gns.cri.nz ↗
PETLAB rock catalogue and geoanalytical database. Do a simple search under "Author's Name" = S. Read
download · from NASA CMR
Catalogue records · 2
- CMR record cmr.earthdata.nasa.gov/search/concepts/C1214591337-SCIOPS.html ↗
catalogue entry · from NASA CMR
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C1214591337-SCIOPS.umm_json ↗
metadata API · from NASA CMR
Topics
- Stated by source
- Age Determinations · Core Processes · GROUND-BASED OBSERVATIONS · Igneous Rocks · Minerals · Tectonic Landforms · VISUAL OBSERVATIONS
Provenance · 1 source records, 13 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C1214591337-SCIOPS | 13 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[instrument].gcmd_instrument:visual-observations | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/solid-earth/geomorphic-landforms-processes/tectonic-landforms | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/solid-earth/rocks-minerals-crystals/age-determinations | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/solid-earth/rocks-minerals-crystals/igneous-rocks | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/solid-earth/rocks-minerals-crystals/minerals | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/solid-earth/tectonics/core-processes | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[platform].gcmd_platform:ground-based-observations | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| description | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/Abstract |
| spatial | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/SpatialExtent |
| temporal | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/TemporalExtents |
| title | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/EntryTitle |
| version_label | source · NASA CMR | connector:nasa_cmr@1.0.0 |