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首页> 外文期刊>Geochemistry, geophysics, geosystems >Aluminum in zircon as evidence for peraluminous and metaluminous melts from the Hadean to present
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Aluminum in zircon as evidence for peraluminous and metaluminous melts from the Hadean to present

机译：锆石的铝，作为哈尔曼灭菌和金属融合熔体的证据

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摘要

Zircon structurally accommodates a range of trace impurities into its lattice, a feature which is used extensively to investigate the evolution of silicate magmas. One key compositional boundary of magmas is defined by whether the molar ratio of Al2O3/(CaO + Na2O + K2O) is larger or smaller than unity. Here we report similar to 800 Al in zircon concentrations from 19 different rocks from the Lachlan Fold Belt (southeastern Australia), New England (USA), and Arunachal leucogranites (eastern Himalaya) with Al2O3/ (CaO + Na2O + K2O) whole rock values that range from 0.88 to 1.6. Zircons from peraluminous rocks yield an average Al concentration of similar to 10 ppm, which distinguishes them from crystals found in metaluminous rocks (similar to 1.3 ppm). This difference is related to the materials involved in the melting, assimilation, and/or magma differentiation processes; for example, magmas that assimilate Al-rich material such as metapelites are expected to produce melts with elevated alumina activities, and thus zircons with high Al concentrations. These observations are applied to the Archean and Hadean Jack Hills detrital zircon record. Detrital Archean zircons, with ages from about 3.30 to 3.75 Ga, yield Al in zircon concentrations consistent with origins in peraluminous rocks in similar to 8% of the cases (n = 236). A single zircon from the pre-3.9 Ga age group (n = 39) contains elevated Al contents, which suggests that metaluminous crustal rocks were more common than peraluminous rocks in the Hadean. Weathered material assimilated into these Hadean source melts was not dominated by Al-rich source material.
机译：锆锆结构上的一系列痕量杂质进入其晶格中，该特征是广泛用于研究硅酸盐岩浆的进化。岩浆的一个关键组成边界由Al 2 O 3 /（CaO + Na 2 O + K 2 O）的摩尔比是否大于或小于单位。在这里，我们将类似于来自19个不同岩石的800 al，从19个不同的岩石，来自拉桑折叠带（澳大利亚），新英格兰（美国）和阿鲁纳恰尔·莱科格斯（东喜马拉雅山）的Al2O3 /（Cao + Na2O + K2O）整个岩石价值该范围为0.88至1.6。来自衰减岩石的锆石将平均浓度类似于10ppm，其区别于熔融岩中的晶体（类似于1.3ppm）。这种差异与熔化，同化和/或岩浆分化过程中涉及的材料有关;例如，预期吸收富含铝业的富含材料的岩浆材料，得到氧化铝活性升高的熔体，从而产生高铝浓度的锆石。这些观察结果适用于Archean和Hadean Jack Hills Detrital Zircon记录。贬值的成员锆石，较大的约3.30至3.75克，在锆石浓度下，与灭菌岩的起源相一致的锆石，类似于8％的病例（n = 236）。来自3.9前A年龄组（n = 39）的单个锆石含有升高的Al含量，这表明储存岩石岩石比哈维尔的灭菌岩体更常见。被融化在这些HAREEAN源熔体中的风化材料未被富含铝的源材料占主导地位。

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