Temporal correlation of magmatic-tectonic events in the lower and upper crust in north-east Australia

Murgulov, Valeria; Griffin, William L.

doi:10.1007/s00531-011-0720-9

Cited by 2 publications

(2 citation statements)

References 65 publications

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“…It has been revealed that the easternmost block is very thin, of about ~50-60 kilometers with no thermal indication of a plume beneath eastern Australia. Instead, rifting was controlled by slabrollback and back-arc extension started in the Mesozoic and continued to the Cenozoic as presumed by numerous previous studies (e.g., Allan et al 1997;Schellart et al 2006;Kositcin et al 2009;Murgulov et al, 2012). Such thinned lithosphere is consistent with our model, that supports continental extension and possibly following thermal relaxation.…”

Section: Mantle Fluids In the Lithospheric Mantle In Extensional Settingsupporting

confidence: 90%

“…During the Cenozoic, continued extension resulted in the formation of widespread intraplate basalt fields (Murgulov et al, 2012), transporting numerous mantle-derived xenoliths to the surface along the eastern margin of Australia (O'Reilly, 1988). The ages of the ATVP volcanic forms vary between 10 ka and 3 ka, and the pyroclastic cone of Mt.…”

Section: A C C E P T E D Mmentioning

confidence: 99%

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Pargasite in fluid inclusions of mantle xenoliths from northeast Australia (Mt. Quincan): evidence of interaction with asthenospheric fluid

et al. 2019

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Three spinel lherzolite xenoliths from Mt Quincan (Queensland, northeastern Australia) were studied with special attention to their enclosed fluid inclusions. The xenoliths are deformed, have porphyroclastic textures and overall show very similar petrographic features. The only significant difference is manifested in the abundance of fluid inclusions in the samples, mostly in orthopyroxene porphyroclasts. Xenolith JMTQ11 is fluid inclusion-free, whereas xenolith JMTQ20 shows a high abundance of fluid inclusions (fluid inclusion-rich). Xenolith JMTQ45 represents a transitional state between the previous two, as it contains only a small amount of fluid inclusions (fluid inclusion-bearing). Previous studies revealed that these xenoliths and the entrapped fluid inclusions represent a former addition of a MORB-type fluid to the pre-existing lithosphere, resulting from asthenosphere upwelling. There is a progressive enrichment in LREE, Nb, Sr and Ti from the fluid inclusion-free xenolith through the fluid inclusion-bearing one to the fluid inclusion-rich lherzolite. This suggests an increase in the extent of the interaction between the fluid-rich melt and the lherzolite wallrock. In addition, the same interaction is considered to be responsible for the formation of pargasitic amphibole as well.The presence of fluid inclusions indicates fluid migration at mantle depth, and their association with exsolution lamellae in orthopyroxene suggests fluid entrapment following the continental rifting (thermal relaxation) during cooling. A series of analyses, including microthermometry coupled with Raman spectroscopy, FTIR hyperspectral imaging, and Focused Ion Beam-Scanning Electron Microscopy (FIB-SEM) was carried out on the fluid inclusions. Based on the results, the entrapped high-density fluid is composed of 75-89 mol % CO2, 9-18 mol % H2O, 0.1-1.7 mol % N2 and ≤ 0.5 mol % H2S with dissolved trace elements (melt component).

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Section: Mantle Fluids In the Lithospheric Mantle In Extensional Settingsupporting

confidence: 90%

Section: A C C E P T E D Mmentioning

confidence: 99%

Pargasite in fluid inclusions of mantle xenoliths from northeast Australia (Mt. Quincan): evidence of interaction with asthenospheric fluid

et al. 2019

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Growth and evolution of NE Australian continental crust interpreted from complex melting-hybridization histories of northern Queensland granulite xenoliths

et al. 2023

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Temporal correlation of magmatic-tectonic events in the lower and upper crust in north-east Australia

Cited by 2 publications

References 65 publications

Pargasite in fluid inclusions of mantle xenoliths from northeast Australia (Mt. Quincan): evidence of interaction with asthenospheric fluid

Pargasite in fluid inclusions of mantle xenoliths from northeast Australia (Mt. Quincan): evidence of interaction with asthenospheric fluid

Growth and evolution of NE Australian continental crust interpreted from complex melting-hybridization histories of northern Queensland granulite xenoliths

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