Abstract

The Musgrave Block hosts about twenty major layered intrusions and several generations of compositionally diverse sills and dykes collectively referred to as the Giles Igneous Complex. All were emplaced in middle Proterozoic intermediate to felsic granulites and amphibolites. On the basis of crystallisation sequences within the cumulates, we distinguish between (1) ultramafic olivine-clinopyroxene rich cumulate sequences, (2) mafic clinopyroxene-plagioclase-rich sequences, and (3) evolved troctolitic olivine-plagioclase ± magnetite-rich sequences. The layered igneous rocks are intruded by several generations of dykes, whose phenocryst assemblages resemble the crystallisation sequences in the cumulates. On this basis, at least three discrete parental melt compositions are identified, namely (1) a near-primitive olivine±clinopyroxene saturated melt, (2) a slightly fractionated olivine-( orthopyroxene )-clinopyroxene-plagioclase saturated melt, and (3) a strongly fractionated fayalitic olivine-plagioclase ± magnetite saturated melt. These magmas represent derivatives of a parental liquid that experienced various degrees of polybaric orthopyroxene-clinopyroxene ± olivine fractionation prior to emplacement, at depths significantly greater than the emplacement levels of the Giles intrusions and the dykes.
Google map showing geographic bounding box with values North bound -24.5 East bound 134.2 West bound 126.5 South bound -28.0
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Product Type/Sub Type

nonGeographicDataset

Constraints

Creative Commons Attribution 4.0 International Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

1995-01-01T00:00:00

Product Type

nonGeographicDataset

Topic Category

geoscientificInformation

GA Catalogue Number

81421 Product http://www.ga.gov.au/metadata-gateway/metadata/record/81421/

Keywords

GA Publication
Journal
NT
SA
WA
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-24.5
East bound
134.2
West bound
126.5
South bound
-28.0

Digital Transfer Options

onLine

Distributor

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

Metadata File Identifier

fae9173a-716a-71e4-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 SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
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