Lithium-bearing phosphates and micas in Homolka leucogranite

Q4 Earth and Planetary Sciences
R. Nahodilová
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Abstract

Homolka granite forms intrusion of highly fractionated leucocratic magma which belongs to the youngest members of the Moldanubian Pluton. The age of the intrusion was estimated between 319 and 315 Ma. The Homolka granite is P-rich, peraluminous and strongly enriched in Li, Rb, Cs, Sn, Nb, Ta and F, showing high U (8–20 ppm) and low Th (< 3 ppm) contents. This study focuses on Li-bearing minerals – phosphates and white micas. Their modal proportions correspond to 1–3 vol. % and 5–15 vol. %, respectively. Both mineral groups occur in several generations in the rock. The first phosphate generation (for example, Al-bearing montebrasite or Fe-Mn-bearing triphylite) contains up to 11 wt. % Li2O. The first generation of mica (Li-phengite) contains about 7–8 wt. % F and up to 1 wt. % Rb2O with Li2O content ranging between 1.3 and 1.9 wt. %. The second generation of white mica, replacing Li-phengite, is depleted in F and Rb and shows decrease in Li2O to 0.5–0.9 wt. %. Despite the low total content of lithium (Li2O = about 0.1 wt. %) in the rock, the occurrence of the leucocratic Homolka granite is not negligible. Because of the high economic potential of lithium, these highly evolved peraluminous and lithium-bearing intrusions will deserve a special attention in the future.
霍莫尔卡浅色花岗岩中的含锂磷酸盐和云母
霍莫尔卡花岗岩是由高分馏白岩浆岩侵入的,这些白岩浆岩属于摩尔多努瓦岩体最年轻的成员。入侵的年龄估计在319 ~ 315 Ma之间。Homolka花岗岩富p、过铝质,强富集Li、Rb、Cs、Sn、Nb、Ta和F, U含量高(8 ~ 20 ppm), Th含量低(< 3 ppm)。本研究的重点是含锂矿物-磷酸盐和白色云母。它们的模态比例分别为1-3 vol. %和5-15 vol. %。这两种矿物群在岩石中分几代出现。第一代磷酸盐(例如,含al的蒙太白石或含fe - mn的三叶石)含有高达11wt . %的Li2O。第一代云母(Li-phengite)含有约7 - 8wt . % F和高达1wt . % Rb2O, Li2O含量在1.3 - 1.9 wt. %之间。第二代白色云母取代Li-phengite, F和Rb均被耗尽,Li2O下降至0.5-0.9 wt. %。尽管岩石中锂的总含量较低(Li2O =约0.1 wt. %),但白垩质Homolka花岗岩的存在不容忽视。由于锂的高经济潜力,这些高度演化的过铝和含锂侵入体在未来将值得特别关注。
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来源期刊
Geoscience Research Reports
Geoscience Research Reports Earth and Planetary Sciences-Stratigraphy
CiteScore
0.30
自引率
0.00%
发文量
0
期刊介绍: Geoscience Research Reports inform the general public about current state of knowledge in a wide variety of geologic subjects. Here the reader will find the results of research conducted by the academia, by the public as well as private sectors. The articles are distributed into individual science topics – regional geology, stratigraphy, Quaternary research, engineering geology, paleontology, mineralogy, petrology, geochemistry, hydrogeology, mineral resources, geophysics, geological information system and international activities.
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