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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Using the magmatic record to constrain the growth of continental crust-The Eoarchean zircon Hf record of Greenland
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Using the magmatic record to constrain the growth of continental crust-The Eoarchean zircon Hf record of Greenland

机译：利用岩浆纪录约束大陆地壳的增长 - 格陵兰岛的eoarchean锆石纪录

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Southern West Greenland contains some of the best-studied and best-preserved magmatic Eoarchean rocks on Earth, and these provide an excellent vantage point from which to view long-standing questions regarding the growth of the earliest continental crust. In order to address the questions surrounding early crustal growth and complementary mantle depletion, we present Laser Ablation Split Stream (LASS) analyses of the U-Pb and Hf isotope compositions of zircon from eleven samples of the least-altered meta-igneous rocks from the Itsaq (Amitsoq) Gneisses of the Isukasia and Nuuk regions of southern West Greenland. This analytical technique allows a less ambiguous approach to determining the age and Hf isotope composition of complicated zircon. Results corroborate previous findings that Eoarchean zircon from the Itsaq Gneiss (similar to 3.85 Ga to similar to 3.63 Ga) were derived from a broadly chondritic source. In contrast to the Sm-Nd whole rock isotope record for southern West Greenland, the zircon Lu-Hf isotope record provides no evidence for early mantle depletion, nor does it suggest the presence of crust older than similar to 3.85 Ga in Greenland.& para;& para;Utilizing LASS U-Pb and Hf data from the Greenland zircons studied here, we demonstrate the importance of focusing on the magmatic (rather than detrital) zircon record to more confidently understand early crustal growth and mantle depletion. We compare the Greenland Hf isotope data with other Eoarchean magmatic complexes such as the Acasta Gneiss Complex, Nuvvuagittuq greenstone belt, and the gneissic complexes of southern Africa, and all lack zircons with suprachondritic Hf isotope compositions. In total, these data suggest only a very modest volume of crust was produced during (or survived from) the Hadean and earliest Eoarchean. There remains no record of planet-scale early Earth mantle depletion in the Hf isotope record prior to 3.8 Ga. (C) 2018 Elsevier B.V. All rights reserved.
机译：南部西格陵兰含有地球上的一些最佳学习和最好的保留的岩浆摇滚乐，这些岩石提供了出色的有利情景，从中查看有关最早的大陆地壳增长的长期问题。为了解决早期地壳增长和互补地幔耗尽周围的问题，我们呈现来自最少改变的Meta-igne-Igne岩石的11个样品的U-Pb和HF同位素组合物的激光消融分裂流（Lass）分析Itsaq（Amitoq）南部西格陵兰群岛的北崎市和努库地区。该分析技术允许确定复杂锆石的年龄和HF同位素组成的较少模糊的方法。结果证实了前一种发现，从itsaq片状（类似于3.85ga至3.63 ga类似的3.85 ga）的结果源自广泛的软质源。与南部西格陵兰州的SM-ND整体岩石同位素对比，Zircon Lu-HF同位素记录不提供早期地幔耗尽的证据，也没有表明存在于格陵兰岛的3.85克的地壳的存在。＆para ;＆帕拉;利用来自格陵兰省在这里研究的Grass U-PB和HF数据，我们展示了重点关注岩浆（而不是旨在纠纷）锆石的重要性，以更加自信地了解早期地壳增长和地幔枯竭。我们将格陵兰兰州HF同位素数据与其他Eoarchean Magmatic复合物相比，如Acasta Gneiss Complex，Nuvvuagittuq Greenstone Belt和南非南部的神话复合物，并且所有缺乏Suprachonditritic HF同位素组成的锆石。总的来说，这些数据表明，在哈维亚和最早的EOARCHEAN中仅产生了一个非常适度的地壳。在3.8 GA之前的HF同位素记录中仍然没有行星级早期地球地幔耗尽。（c）2018年Elsevier B.v.保留所有权利。

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