Product catalogue
Geology of northern Jetty Peninsula, MacRobertson Land, Antarctica
Northern Jetty Peninsula, incorporating Else Platform (~140 km2) and Kamenistaja Platform (~15 km2), represents a mostly ice-free low-lying region located on the western flanks of the Lambert Graben. The region is underlain by granulite-facies Proterozoic gneisses and unmetamorphosed Permian sediments.
Metamorphic rock types include quartzo-feldspathic, pelitic and semi-pelitic metasedimentary rocks of probable Mesoproterozoic age (Kamenistaja Paragneiss and Else Gneiss). Minor intercalated ultramafic and calc-silicate bodies are also present. Neoproterozoic (ca. 940-1000 Ma) syn-tectonic felsic intrusives (megacrystic Chistoe Granite, Melkoe Granite and Soyuz Leucogranite) are also widespread.
Proterozoic rocks are subsequently intruded by Paleozoic Jetty Granite Dykes and felsic Stagnant Pegmatites (ca. 500 Ma), alkaline mafic dykes (ca. 308-320 Ma) and Mesozoic alkaline stocks and pipes (ca. 130-150 Ma). The Toploje Member of the Amery Group (a sequence of Permo-Triassic fluvial siliciclastic rocks, which outcrop extensively on the southern and western flanks of Beaver Lake) is exposed on southwestern Kamenistaja Platform and appears fault-bounded against the high-grade Proterozoic rocks.
Together with adjacent high-grade rocks in Kemp and Mac.Robertson Lands to the west, the rocks of northern Jetty Peninsula form part of an extensive Meso-Neoproterozoic high-grade mobile belt (the 'Rayner Orogeny'; ca. 900-1100 Ma). During this event, on Else Platform, peak metamorphic conditions reached pressures as much as ~6.5 to 7.5 kbar at temperatures ~ 800º C and resulted in the development of a pervasive gneissosity (the dominant form surface, S1). Localized high-strain zones (S2) developed during latter stages of the high-grade metamorphic evolution, conditions during which are estimated at ~5 to 6 kbar at temperatures ~ 700º C.
The intrusion of north-trending Jetty Granite Dykes (and their subsequent deformation) at ca. 500 Ma occurred at probable upper amphibolite-facies, indicating that an early Palaeozoic event (which reached granulite-facies in Prydz Bay, ~ 200-300 km to the northeast) significantly affected the Jetty Peninsula region.
Minor northwest-trending steeping dipping mylonites and vertical north-trending brittle faults cut all rock types, except the massive quartz 'blows' and veins. These quartz pods are locally abundant (e.g. near Soyuz station), and, together with the late brittle faults, are thought to be related to incipient rifting of the Lambert Graben during the breakup of Gondwana.
Simple
Identification info
- Date (Publication)
- 2012-01-01T00:00:00
- Edition
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1
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/74654
- Cited responsible party
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Role Organisation / Individual Name Details Author Hand, M.
External Contact Author Scrimgeour, I.R.
External Contact Author Stuwe, K.
External Contact Author Arne, D.
External Contact Author Carson, C.J.
External Contact
- Point of contact
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Role Organisation / Individual Name Details Resource provider Place and Communities Division
External Contact Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact McLennan, S.
Place and Communities Internal Contact
Spatial resolution
Equivalent scale
- Denominator
- 25000
- Topic category
-
- Geoscientific information
Extent
))
- Maintenance and update frequency
- Unknown
- Keywords
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Geological Map
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25K scale
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- Theme
-
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Antarctic data
-
mapping
-
geology
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- Keywords
-
-
AQ
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- Australian and New Zealand Standard Research Classification (ANZSRC)
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Geology
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- Keywords
-
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Published_External
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Resource constraints
- Title
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Creative Commons Attribution 4.0 International Licence
- Alternate title
-
CC-BY
- Edition
-
4.0
- Access constraints
- License
- Use constraints
- License
Resource constraints
- Title
-
Australian Government Security ClassificationSystem
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
- Language
- English
- Character encoding
- UTF8
Distribution Information
- Distributor contact
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Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
Voice
- OnLine resource
-
File download
Download the file (pdf)
- Distribution format
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-
pdf
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Resource lineage
- Statement
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Unknown
- Hierarchy level
- Non geographic dataset
- Other
-
Geological Map
- Description
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The map was produced from hardcopies of geological linework provided by University mapping geologists (Hand, Stuwe, Scrimgeour, Arne), that mapped Jetty Peninsula during Antarctic field seasons 1989/90 and 1990/91. The linework was digitised and rectified at GA and used to produce the map product. The GIS data of the map will be released as a separate GeoCat reference and this to this geocat reference.
Reference System Information
- Reference system identifier
- EPSG/WGS 84 (EPSG:4326)
Metadata constraints
- Title
-
Australian Government Security ClassificationSystem
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
Metadata
- Metadata identifier
-
urn:uuid/c9162371-9d36-1de1-e044-00144fdd4fa6
- Title
-
GeoNetwork UUID
- Language
- English
- Character encoding
- UTF8
- Contact
-
Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact McLennan, S.
Place and Communities Internal Contact
Type of resource
- Resource scope
- Document
- Name
-
nonGeographicDataset
Alternative metadata reference
- Title
-
Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/74654
- Date info (Revision)
- 2018-04-22T08:13:45
- Date info (Creation)
- 2012-09-07T00:00:00
Metadata standard
- Title
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AU/NZS ISO 19115-1:2014
Metadata standard
- Title
-
ISO 19115-1:2014
Metadata standard
- Title
-
ISO 19115-3
- Title
-
Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
- Edition
-
Version 2.0, September 2018
- Citation identifier
- https://pid.geoscience.gov.au/dataset/ga/122551