Age, origin, and thermal evolution of the ultra-fresh ~ 1.9 Ga Winnipegosis Komatiites, Manitoba, Canada

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• 作者：Pedro Waterton^a ; ^{waterton@ualberta.ca} ; D. Graham Pearson^a ; ^{gdpearso@ualberta.ca} ; Bruce Kjarsgaard^b ; ^{bruce.kjarsgaard@canada.ca} ; Larry Hulbert^b ; ¹ ; ^{lhlhulbert7@gmail.com} ; Andrew Locock^a ; ^{alocock@ualberta.ca} ; Stephen Parman^c ; ^{stephen_parman@brown.edu} ; Bill Davis^b ; ^{bill.davis@canada.ca}
• 关键词：Proterozoic ; Komatiite ; Circum-Superior Belt ; Trans-Hudson Orogeny ; Al-in-olivine thermometer ; Mantle potential temperature
• 刊名：Lithos
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：268-271
• 期：Complete
• 页码：114-130
• 全文大小：3795 K
• 卷排序：268

文摘

Pristine Palaeoproterozoic komatiites are described, their cooling and crystallisation history is reconstructed Parental melts were nominally dry, with depleted compositions, and MgO contents ≈ 24 wt% Liquidus temperature of ~ 1501 °C requires anomalously hot mantle Formation from a mantle plume that was deflected by strong gradients in lithospheric thickness towards pre-existing rifts New U–Pb zircon age of 1870.3 ± 7.1 Ma for the Winnipegosis Komatiite Belt