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

• 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: Victoria Land; Victoria; Northern Foothills; Granite Harbour; Deep Freeze Range; Prince Albert Mountains; Mountaineer Range
• 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

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.