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首页> 外文期刊>Contributions to Mineralogy and Petrology >Comment on: 'Enriched mantle-Dupal signature in the genesis of the Jurassic Ferrar tholeiites from Prince Albert Mountains (Victoria Land, Antarctica)' by Antonini P. et al. (Contributions to Mineralogy and Petrology 136, 1-19; 1999)
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Comment on: 'Enriched mantle-Dupal signature in the genesis of the Jurassic Ferrar tholeiites from Prince Albert Mountains (Victoria Land, Antarctica)' by Antonini P. et al. (Contributions to Mineralogy and Petrology 136, 1-19; 1999)

机译：评论：“安东尼奥·P·等人在“来自阿尔伯特亲王山脉（维多利亚州，南极洲）的侏罗纪费拉尔型陶粒岩的成因中富集了地幔-Dupal签名”。 （对矿物学和岩石学的贡献136，1-19; 1999）

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摘要

Although it has long been argued that evolution of the Jurassic Ferrar tholeiites involves crustal assimilation processes (+-fractional crystallisation or AFC; e.g. Hoefs et al. 1980; Mensing et al. 1984), in the past two decades a general consensus has emerged that certain trace element features observed in the most primitive lavas cannot be product of crustal-level processes (e.g. Kyle 1980; Hergt et al. 1989a, b; Hergt et al. 1991; Brewer et al. 1992; Molzahn et al. 1996). Further, isotopic evidence in support of this comes from positively correlated isotope ratios of Sr and O in which, at mantle-like #delta#~(18)O values, the magmas retain initial ~(87)Sr/~(86)Sr Compositions of greater than 0.709 (e.g. Hoefs et al. 1980). Consistent with this is the lack of a radiogenic Os isotope signature in these rocks (e.g. Molzahn et al. 1996) as would be expected with assimilation of continental crust. Comments here are not concerned with the AFC calculations employed to describe the variations within the suite of samples from the Prince Albert mountains studied by Antonini et al., but rather, the extrapolation of these to more primitive compositions.Antonini et al. have revived the possibility that the unusual chemical features of the least evolved low Ti continental flood basalts of the Ferrar Province reflect a crustal-level interplay between mantle-derived magmas and the continental crust. It is argued here that they have not demonstrated their claim.
机译：尽管长期以来一直有人争论说侏罗纪费拉尔菱铁矿的演化涉及地壳同化过程（+分数结晶或AFC;例如Hoefs等人1980; Mensing等人1984），但在过去的二十年中，人们普遍达成共识：在最原始的熔岩中观察到的某些微量元素特征不能是地壳水平过程的产物（例如，Kyle 1980; Hergt等，1989a，b; Hergt等，1991; Brewer等，1992; Molzahn等，1996）。此外，支持这一现象的同位素证据来自于Sr和O的正相关同位素比，其中在地幔样＃delta＃〜（18）O值处，岩浆保留了初始〜（87）Sr /〜（86）Sr大于0.709的成分（例如Hoefs等，1980）。与此相一致的是，这些岩石中缺乏放射源的Os同位素特征（例如Molzahn等人1996），这与大陆壳的同化作用是可以预期的。这里的评论与Antonini等人研究的用来描述阿尔伯特亲王山的一组样本中的变化所使用的AFC计算无关，而是将这些推断扩展到更原始的成分上。已经使费拉尔省发展程度最低的低钛大陆洪水玄武岩异常化学特征反映出地幔源岩浆与大陆壳之间地壳级相互作用的可能性得到了恢复。这里有人争辩说他们没有证明自己的主张。

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