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Liquid ilmenite or liquidus ilmenite: a comment on the nature of ilmenite vein deposits

机译：液态钛铁矿或液态钛铁矿：对钛铁矿脉沉积物性质的评论

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摘要

The interstitial character of ilmenite in common gabbroidic rocks has led to the idea that the last drop of liquid to crytallize in a rock could be pure ilmenite. When injected into enclosing rocks this liquid could give rise to ilmenite-pure veins. Fractional crystallization or immiscibility cannot produce a pure ilmenite melt. Actually, ilmenite is a liquidus mineral, which is the first or among the first mafic minerals to crystallize in Fe-Ti rich magmas. This is clearly shown by the sequence of crystallization in the Bjerkreim-Sokndal layered intrusion, by quantitative modelling of the liquid line of descent of jotunitic (hypersthene monzodioritic) magmas, and by experimental work. The interstitial character of ilmenite is therefore acquired subsolidus. Deformation can enhance the process. The synemplacement deformation linked to the diapiric uprise of anorthosite massifs is a suitable environment for the formation of layers of Cr- and Mg-rich ilmenite and their subsequent deformation and mobilization in discordant veins of pure ilmenite.
机译：钛铁矿在常见辉长岩岩石中的间隙特征导致人们认为，岩石中最后结晶的一滴液体可能是纯钛铁矿。当注入围岩中时，这种液体会产生纯钛铁矿脉。部分结晶或不溶混不能产生纯钛铁矿熔体。实际上，钛铁矿是液相线矿物，它是富含铁钛的岩浆中第一种或首批结晶的铁镁质矿物。 Bjerkreim-Sokndal层状侵入体中的结晶顺序，对jo状单元（hyperthene monzodioritic）岩浆的下降线的定量模拟以及实验工作清楚地表明了这一点。因此，钛铁矿的间隙特征是获得的亚固相线。变形可以增强过程。与原位块地块的底基隆起相关的同位变形是形成富含Cr和Mg的钛铁矿层以及随后的变形和在纯钛铁矿不协调脉动中动员的合适环境。

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  • 作者

    Duchesne, Jean-Clair;

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  • 年度 1996
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  • 正文语种 en
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