Coupled zircon Lu-Hf and U-Pb isotopic analyses of the oldest terrestrial crust, the >4.03 Ga Acasta Gneiss Complex

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• 作者：Ann M. Bauer^a ; ^{annbauer@mit.edu} ; Christopher M. Fisher^b ; ¹ ; Jeffrey D. Vervoort^b ; Samuel A. Bowring^a
• 关键词：Acasta Gneiss Complex ; crustal evolution ; early Earth ; laser ablation split-stream ; Hf isotopes ; zircon
• 刊名：Earth and Planetary Science Letters
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：458
• 期：Complete
• 页码：37-48
• 全文大小：1262 K
• 卷排序：458

文摘

Robust initial isotopic signatures obtained via laser ablation split-stream technique. Evidence of Hadean source material at the Acasta Gneiss Complex (AGC). AGC source change at ∼3.6 Ga evidenced by input of juvenile material. No evidence of input from a strongly depleted mantle at the AGC. We extend the AGC Lu–Hf isotopic record to >1 Ga of magmatic activity (4.0–2.9 Ga).