Terminal tectono-magmatic phase of the New England Orogen driven by lithospheric delamination

Olierook, Hugo K.H.; Gale, Jasmine; Pirajno, Franco; Jourdan, Fred; Kirkland, Christopher L.; Evans, Noreen J.; McDonald, Bradley J.; Krejci, Mark; Jiang, Qiang; Kumara, Anusha Shantha; Mayers, Celia; Frew, R. Adam; Kaag, Hugo; McInnes, Brent

doi:10.1016/j.gr.2022.01.002

Cited by 1 publication

(2 citation statements)

References 143 publications

(71 reference statements)

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“…The thin section was subsequently carbon coated and analysed using a Tescan Integrated Mineral Analyser (TIMA) in the John de Laeter Centre (JdLC), Curtin University, to aid in mineral identification, particularly with respect to identifying dateable minerals [50][51][52] . A TIMA is a field emission gun scanning electron microscope (FEG-SEM), equipped with four electron dispersive X-ray spectrometers (EDS), and capable of recording 420k X-ray counts per second.…”

Section: Thin Section Petrographic Methods and Preparationmentioning

confidence: 99%

“…Uncertainties on analyses of primary reference materials were propagated in quadrature to the unknowns and secondary apatite reference materials. For the unknowns, some analyses ablated across inadvertent inclusions; these inclusion-related signals were cropped from the integrations; although this maintains the accuracy of the cropped analyses, the U-Pb precision is significantly reduced due to the shorter integration times 51 , 61 . If inclusions were too large or numerous, the integrations were deleted.…”

Section: Methodsmentioning

confidence: 99%

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Emplacement of the Argyle diamond deposit into an ancient rift zone triggered by supercontinent breakup

Olierook,

Fougerouse,

Doucet

et al. 2023

Nat Commun

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Argyle is the world’s largest source of natural diamonds, yet one of only a few economic deposits hosted in a Paleoproterozoic orogen. The geodynamic triggers responsible for its alkaline ultramafic volcanic host are unknown. Here we show, using U-Pb and (U-Th)/He geochronology of detrital apatite and detrital zircon, and U-Pb dating of hydrothermal titanite, that emplacement of the Argyle lamproite is bracketed between 1311 ± 9 Ma and 1257 ± 15 Ma (2σ), older than previously known. To form the Argyle lamproite diatreme complex, emplacement was likely driven by lithospheric extension related to the breakup of the supercontinent Nuna. Extension facilitated production of low-degree partial melts and their migration through transcrustal corridors in the Paleoproterozoic Halls Creek Orogen, a rheologically-weak rift zone adjacent to the Kimberley Craton. Diamondiferous diatreme emplacement during (super)continental breakup may be prevalent but hitherto under-recognized in rift zones at the edges of ancient continental blocks.

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Section: Thin Section Petrographic Methods and Preparationmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%