A small-scale hydrothermal uranium mineralization hosted within the siderite deposit at Hüttenberg (Eastern Alps, Austria) was re-investigated using modern scanning electron microscope (SEM) and microprobe (EMPA) methods. The uranium mineralization comprises brannerite, coffinite and uraninite, and is spatially associated with Fe-, Ni- and Co-arsenides (loellingite, rammelsbergite, safflorite), bismuth and bismuthinite, as well as rare accessory silver-bearing minerals and gold locally. The U-bearing fluids also carried P, Y and REEs, which precipitated as xenotime and P–Y coffinite. The uranium mineralization paragenetically postdates the metasomatic formation of the host siderite ore.

Uraninite allows for precise single spot EMPA ages to be calculated (±2 Ma) due to its high radiogenic lead content. There is an excellent internal consistency in the uraninite data with calculated dates ranging between 77 and 84 Ma. We interpret that these record the crystallization age of the uraninite, and that any influences of lead loss or common Pb are minimal. Brannerite was also analyzed but U-total Pb microprobe data scatter (c.30–80 Ma) with evidence of lead loss, particularly in altered domains. It does, however, provide a minimum constraint on the timing of mineralization that is consistent with the crystallization age of the uraninite. Coffinite proved completely unsuitable for U-total Pb geochronology due to extreme lead loss. However, hydrothermal xenotime yields a U-total Pb age of 78 ± 5 Ma, consistent with the uraninite age. Therefore, the U-total Pb geochronological data support a late Cretaceous age for the U-mineralization of c. 80 Ma. Considering this timing constraint together with other geological and indirect thermochronological aspects, we conclude that the siderite deposit of Hüttenberg is older and formed at c. 90−80 Ma.

使用现代扫描电子显微镜（SEM）和微探针（EMPA）方法对位于Hüttenberg（奥地利东部阿尔卑斯山）菱铁矿矿床中的小规模热液铀矿化进行了研究。铀的矿化包括褐铁矿，钴铁矿和铀锰矿，并且在空间上与铁，镍和钴砷化物（菱镁矿，斜方锰铁矿，方镁石，铋和双亚菱铁矿）以及稀有的含银辅助矿物和金在空间上相关。含U的流体还携带P，Y和REE，它们以xenotime和P–Y余量形式沉淀。铀成矿作用是伴生的，其推迟了菱铁矿矿石的交代形成。

由于其放射源性铅含量高，因此铀红石可以计算出精确的单点EMPA年龄（±2 Ma）。尿素岩数据具有极好的内部一致性，计算的日期介于77到84 Ma之间。我们解释说，这些记录了铀矿的结晶年龄，并且铅损失或常见Pb的任何影响都很小。还对褐铁矿进行了分析，但是U总Pb微探针数据散布（约30–80 Ma），并伴有铅损失的证据，尤其是在域变化的情况下。但是，它确实对矿化时间提供了最小限度的限制，该限制与铀矿的结晶年龄是一致的。由于极高的铅损失，Coffinite被证明完全不适合U总Pb年代学。但是，热液异种时间产生的U-总Pb年龄为78±5 Ma，与铀矿的年龄一致。因此，铀的总铅年代学数据支持白垩纪晚期的铀成矿。80毫安。考虑到这种时间上的限制以及其他地质和间接的热年代学方面的结论，我们得出的结论是，赫滕贝格的菱铁矿矿床较老，形成于c处。90−80 Ma。