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首页> 外文期刊>Indian medical journal >Liandratite from Karkonosze pegmatites, Sudetes, Southwestern Poland
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Liandratite from Karkonosze pegmatites, Sudetes, Southwestern Poland

机译：来自karkonosze pegmatites，波兰西南部苏格兰斯岛的Liandratite

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摘要

The chemical composition of liandratite, U_(6+)(Nb,Ta)~(2)O~(8), was determined from material collected in Niobium, Yttrium, Fluorine type (NYF) pegmatites of the Karkonosze intrusion (Sudetes, SW Poland). Liandratite occurs mainly as rims, up to 40?μm thick, and fracture infillings in fergusonite-(Y) and other Nb-Ta-Ti minerals. Its formation was related to the fluid-driven alteration of primary minerals by three potential mechanisms: (i) direct replacement of a primary mineral by liandratite; (ii) breakdown of the primary mineral to liandratite and a product with the composition of minerals of the pyrochlore group; (iii) multistage alteration, which involved: removal of A-site cations (mostly Y?+?REE with the exception of U_(4+)) and formation of phases with the composition of pyrochlore group minerals; then crystallization of U-, Bi-, Pb-rich pyrochlores and their replacement by liandratite. The chemical compositions of liandratite formed by the breakdown of different primary minerals are also different, mainly in their U, Ti and Nb contents. Excess Ti, relative to the U_(6+)Nb~(2)O~(8)end-member, is incorporated into the structure together with additional U. The Ti content of liandratite, and partially through this the U content, are dependent on the nature of the precursor mineral.
机译：Liandratate，U_（6 +）（Nb，Ta）〜（2）O〜（8）的化学成分由Karkonosze入侵的铌，钇，氟型（NYF）Pegmatites（Suistes，SW的氟波兰）。 Liandratite主要是作为轮辋，厚度为40？μm厚度，弗格森骨杆菌 - （Y）和其他Nb-Ta-Ti矿物质的骨折潜水。其形成与三个潜在机制的初级矿物的流体驱动的改变有关：（i）通过Liandratite直接更换原发性矿物质; （ii）初级矿物与Liandratate的崩溃和烧纤维组矿物组成的产品; （iii）涉及的多级改变：除去A现场阳离子（大多数Y？+？REE除外，除U_（4 +））和与纤维粒组成的组成形成阶段;然后通过Liandratite结晶U-，Bi-，Pb，Pb的富氯和替代物。由不同初级矿物质的击穿形成的Liandratite的化学成分也不同，主要是在其U，Ti和Nb内容物中。相对于U_（6+）Nb〜（2）o〜（8）末端构件的过量Ti与额外的U.联合含量的延伸液，并且部分通过该U含量掺入结构中，是依赖于前体矿物质的性质。

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