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首页> 外文期刊>Ore Geology Reviews: Journal for Comprehensive Studies of Ore Genesis and Ore Exploration >Tantalum and niobium mineralization from F- and Cl-rich fluid in the lepidolite-rich pegmatite from the Renli deposit in northern Hunan, China: Constraints of fluid inclusions and lepidolite crystallization experiments
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Tantalum and niobium mineralization from F- and Cl-rich fluid in the lepidolite-rich pegmatite from the Renli deposit in northern Hunan, China: Constraints of fluid inclusions and lepidolite crystallization experiments

机译：来自湖南北部林披米岩富含铅岩石和富含Cl-olid液体的钽和铌矿化，从湖南北部矿床：流体夹杂物和鳞翅石结晶实验的约束

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Lepidolite-type pegmatite usually produces tantalum-niobium (Ta-Nb) resources; however, the role of the hydrothermal fluid in the Ta-Nb mineralization remains controversial. The pegmatite dike No. 5 is a lepidolite-rich dike in the Ta-Nb pegmatite deposit in Renli, Hunan, China, with a high-grade Ta2O5 in the lepidolite-quartz core. The fluid inclusions with primary features in the quartz from the core have a relatively high T(h)s (similar to 270-290 degrees C) and salinity (similar to 10 wt% NaCleq). The mineral features such as occurrences of pezzottaite and fluomatromicrolite, as well as the assemblage of lepidolite, quartz, and albite, further confirm that the fluid inclusions were entrapped in a Na-, Li-, Cs-, F-, and Cl-rich fluid from which quartz and lepidolite crystallized. These fluid inclusions were inferred to be trapped between 640 degrees C and 530 MPa and 550 degrees C and 350 MPa, based on the fluid inclusion isochores and the lepdilite crystallization temperature-pressure (T-P) conditions that were determined via lepidolite crystallization experiments in aqueous solutions with a high f(HF) and a salinity of 10 wt % NaCl in a hydrothermal diamond-anvil cell. Although the P-T conditions are in accordance with the stability field of spodumene, no spodumene was observed in the No. 5 dike because of the high f(HF) in the fluid. Such Li-, Cs-, F-, Cl-rich fluids could be an indicator of the final layer liquid in the model of constitutional zone refining or B-type fluid/melt in the immiscibility model. Moreover, it could dissolve the previous magmatic Nb-Ta minerals in the form of (Li, Na, Cs)[Ta(Nb)O(F, Cl)(4)] with Ta-Nb remaining in the aqueous solution until the deposition of Ta-Nb minerals during the crystallization of lepidolite and albite in lepidolite-qaurtz core in No.5 dike in the Renli deposit.
机译：Lepidolite型Pegmatite通常产生钽 - 铌（TA-NB）资源;然而，水热流体在TA-NB矿化中的作用仍存在争议。 Pegmatite Dike No. 5是湖南湖南雷利的TA-NB PEGMATITE矿床中富含含有富葡聚石的堤防。具有来自核心的石英中的初级特征的流体夹杂物具有相对高的T（H）S（类似于270-​​290℃）和盐度（类似于10wt％的鼻窦仪）。矿物质特征如锡磷酸盐和荧光素血红素，以及鳞片，石英和亚沸石的组合，进一步证实流体包裹体被捕获在Na-，Li-，CS，F-和富含Cl石英和鳞翅石的流体结晶。推断这些流体夹杂物基于通过在水溶液中通过Lepidolite结晶实验确定的流体包容性同胞和Lepdilite结晶温度（TP）条件捕获640℃和530MPa和550℃和350MPa。在水热金刚石 - 砧座细胞中具有高f（HF）和10wt％NaCl的盐度。尽管P-T条件符合脱淀的稳定性场，但由于流体中的高f（HF），在第5次堤时没有观察到脱氨酸。这种Li-，Cs-，F-，Cl的流体可以是在不混合模型中的构成区精炼或B型流体/熔体模型中的最终层液的指示。此外，它可以溶解以（Li，Na，Cs）[Ta（Nb）O（F，Cl）（4））的形式溶解在水溶液中直至沉积中的Ta-Nb的形式在Renli沉积物中5号堤防锂岩岩和Albite结晶过程中的Ta-Nb矿物质。

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