Inside the Granite Harbour Intrusives of northern Victoria Land: Timing and origin of the intrusive sequence

sequence composed of metaluminous and peraluminous granitoids, and minor ultramafic and mafic rocks, with variable K-enrichment and magmatic arc affinity. The main intrusive units cropping out in the Wilson Terrane between the Prince Albert Mountains and the Mountaineer Range have been dated by mean...

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Bibliographic Details
Main Authors: R. M. Bomparola, C. Ghezzo, Summary Cambro-ordovician, Granite Harbour Intrusives, In Northern Victoria L
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Subjects:
Deep Freeze Range
Granite Harbour
Mountaineer Range
Northern Foothills
Prince Albert Mountains
Victoria
Victoria Land
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.594.728
http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea043.pdf
Description
Summary:sequence composed of metaluminous and peraluminous granitoids, and minor ultramafic and mafic rocks, with variable K-enrichment and magmatic arc affinity. The main intrusive units cropping out in the Wilson Terrane between the Prince Albert Mountains and the Mountaineer Range have been dated by means of in-situ U-Pb LA-ICPMS analyses of zircons. The obtained results constrain the timing of emplacement of major crustal-derived anatectic melts in this area between 521 and 481 Ma, a time interval of 40 Ma. The mantle-derived mafic-ultramafic rocks, associated to the main high-K granitoids in the Deep Freeze Range-Northern Foothills, cover a time interval between 521 and 487 Ma. The long-lasting intrusive mafic and felsic magmatism caused the slow cooling of the basement responsible, together with local deformation and fluid circulation, of the common young reset ages observed in some of the studied intrusions.

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