Authors / CoAuthors
Kinny, P.D. | Black, L.P. | Sheraton, J.W.
Abstract
High-grade metamorphic and felsic igneous rocks from the northern Prince Charles Mountains, East Antarctica, have been characterised geochemically and dated from SHRIMP zircon geochronological data. Around 980 Ma ago, voluminous magmas representing a combination of mantle-derived and intracrustal melts, including orthopyroxene-quartz monzonite (charnockite) on Loewe Massif and granitic and syenitic intrusions on Mount Collins, were emplaced during a regional high-grade tectonothermal event. Garnet leucogneiss sheets on Mount McCarthy, the products of local partial melting, were also emplaced at about this time. The geology of Fisher Massif is exceptional in that a ca 1280-Ma metavolcanic sequence and coeval granodiorite have been metamorphosed only up to the lower amphibolite facies, and intruded by a ca 1020-Ma biotite granite. None of the analysed sarnples shows in its isotopic systematics the effects of 500-Ma events, prominent elsewhere in East Antarctica. Rare inherited components 1850-1900 Ma old were found in some samples. A paragneiss on Mount Meredith yielded 2500- 2800-Ma and 1800-2100-Ma detrital zircon populations.
Product Type
document
eCat Id
81467
Contact for the resource
Custodian
Owner
Custodian
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
-
- GA PublicationJournal
-
- AAT
- Australian and New Zealand Standard Research Classification (ANZSRC)
-
- Earth Sciences
-
- Published_External
Publication Date
1997-01-01T00:00:00
Creation Date
Security Constraints
Legal Constraints
Status
Purpose
Maintenance Information
unknown
Topic Category
geoscientificInformation
Series Information
AGSO Journal of Australian Geology and Geophysics 16:5:637-654
Lineage
Unknown
Parent Information
Extents
[-72.0, -69.5, 63.0, 69.5]
Reference System
Spatial Resolution
Service Information
Associations
Source Information
Source data not available.