MAGMATIC EVOLUTION AND ASCENT HISTORY OF THE ARIES MICACEOUS KIMBERLITE, CENTRAL KIMBERLEY BASIN, WESTERN AUSTRALIA: EVIDENCE FROM ZONED PHLOGOPITE PHENOCRYSTS, AND UV LASER 40AR/39AR ANALYSIS OF PHLOGOPITE-BIOTITE
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dc.contributor.author | Downes P.J. | |
dc.contributor.author | Wartho Jo.A. | |
dc.contributor.author | Griffin B.J. | |
dc.date.accessioned | 2024-08-03T06:10:51Z | |
dc.date.available | 2024-08-03T06:10:51Z | |
dc.date.issued | 2006 | |
dc.identifier | https://elibrary.ru/item.asp?id=10499721 | |
dc.identifier.citation | Journal of Petrology, 2006, 47, 9, 1751 | |
dc.identifier.issn | 0022-3530 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/44597 | |
dc.description.abstract | The Neoproterozoic Aries kimberlite was emplaced in the central Kimberley Basin, Western Australia, as a N–NNE-trending series of three diatremes infilled by lithic-rich kimberlite breccias. The breccias are intruded by hypabyssal macrocrystic phlogopite kimberlite dykes that exhibit differentiation to a minor, high-Na–Si, olivine–phlogopite–richterite kimberlite, and late-stage macrocrystic serpentine–diopside ultramafic dykes. Mineralogical and geochemical evidence suggests that the high-Na–Si, olivine–phlogopite–richterite kimberlite was derived from the macrocrystic phlogopite kimberlite as a residual liquid following extended phlogopite crystallization and the assimilation of country rock sandstone, and that the macrocrystic serpentine–diopside ultramafic dykes formed as mafic cumulates from a macrocrystic phlogopite kimberlite. Chemical zonation of phlogopite–biotite phenocrysts indicates a complex magmatic history for the Aries kimberlite, with the early inheritance of a range of high-Ti phlogopite–biotite xenocrysts from metasomatized mantle lithologies, followed by the crystallization of a population of high-Cr phlogopite phenocrysts within the spinel facies lithospheric mantle. A further one to two phlogopite–biotite overgrowth rims of distinct composition formed on the phlogopite phenocrysts at higher levels during ascent to the surface. Ultra-violet laser 40Ar/39Ar dating of mica grain rims yielded a kimberlite eruption age of 815·4?±?4·3?Ma (95% confidence). 40Ar/39Ar laser profiling of one high-Ti phlogopite-biotite macrocryst revealed a radiogenic 40Ar diffusive loss profile, from which a kimberlite magma ascent duration from the spinel facies lithospheric mantle was estimated (assuming an average kimberlite magma temperature of 1000°C), yielding a value of ?0·23–2·32?days for the north extension lobe of the Aries kimberlite. | |
dc.subject | 40Ar/39Ar | |
dc.subject | diamond | |
dc.subject | kimberlite | |
dc.subject | mantle metasomatism | |
dc.subject | phlogopite–biotite | |
dc.title | MAGMATIC EVOLUTION AND ASCENT HISTORY OF THE ARIES MICACEOUS KIMBERLITE, CENTRAL KIMBERLEY BASIN, WESTERN AUSTRALIA: EVIDENCE FROM ZONED PHLOGOPITE PHENOCRYSTS, AND UV LASER 40AR/39AR ANALYSIS OF PHLOGOPITE-BIOTITE | |
dc.type | Статья | |
dc.subject.age | Докембрий::Протерозой::Неопротерозойская | |
dc.subject.age | Precambrian::Proterozoic::Neoproterozoic |
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