Citation

Hoatson, D.M. & Stewart, A.J., 2001. Field investigations of Proterozoic mafic-ultramafic intrusions in the Arunta Province, central Australia. Record  2001/039. Geoscience Australia, Canberra.

Abstract

Field investigations by AGSO-Geoscience Australia in late 2000, as part of a National Geoscience Agreement with the Northern Territory Geological Survey (NTGS), evaluated the geological setting of Proterozoic mafic-ultramafic intrusions in the Arunta Province of central Australia. The major aims of this regional study were to constrain the various mafic-ultramafic magmatic systems within the event chronology of the Arunta Province, and to provide a geoscientific framework for assessing the prospectivity and resource potential of the intrusions. This report summarises the field relationships and mineralisation features of the major mafic-ultramafic intrusions in the Arunta Province. They form large homogeneous gabbroic bodies, folded high-level mafic sills, steeply dipping amphibolite sheets and relatively undeformed ultramafic plugs with alkaline and tholeiitic affinities. Metamorphic grades range from granulite to sub-amphibolite facies. Chilled and contaminated margins and net-vein complexes resulting from the commingling of mafic and felsic magmas indicate that most intrusions crystallised in situ and were not tectonically emplaced. The intrusions were subdivided into western, central and eastern groups on the basis of lithology, metamorphic-structural history, degree of fractionation and limited geochronology. The field investigations described here and preliminary geochemical data (see Hoatson 2001) indicate that the western and central intrusions have some potential for Ni-Cu-Co sulphide deposits, whereas the eastern intrusions appear to be more prospective for platinum-group element (PGE) mineralisation. The recent emerging evidence that the eastern Arunta is prospective for PGE mineralisation is supported by exploration companies defining anomalous PGE-Cu-Au concentrations in hydrothermal veins hosted by the Riddock Amphibolite and in magnetite layers of the Attutra Metagabbro. These results, for the first time, highlight geographical differences in the mineral prospectivity of mafic-ultramafic rocks in the Arunta Province.
Google map showing geographic bounding box with values North bound -22.0 East bound 136.25 West bound 130.42 South bound -23.45
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Product Type/Sub Type

dataset - GA Publication - Record

Constraints

license
Creative Commons Attribution 3.0 Australia Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

2001

Product Type

dataset

Topic Category

geoscientificInformation

Keywords

GA Publication
Record
geology
stratigraphy
economic geology
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-22.0
East bound
136.25
West bound
130.42
South bound
-23.45

Lineage

Unknown

Digital Transfer Options

onLine

DISTRIBUTION Format

pdf

Distributor

Role
distributor
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Metadata File Identifier

a05f7892-b649-7506-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

Metadata Date Stamp

2001-10-15

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
Downloads
For information on acquiring this product,
please contact the Geoscience Australia Sales Centre via:

fax:
+61 2 6249 9960; or
phone:
1800 800 173 (within Australia);
 
+61 2 6249 9966 (outside Australia).

Please note that support hours are 9 am to 5 pm weekdays