The middle Anisian extensional tectonics of the Neotethyan realm developed a small, isolated carbonate platform in the middle part of the Balaton Highland (western Hungary), resulted in the deposition of uranium-bearing seamount phosphorite on the top of the drowned platform and produced some epigenetic fluorite veins in the Middle Triassic sequence. The stable C-O isotope data of carbonates are shifted from the typical Triassic carbonate ranges, confirming the epigenetic-hydrothermal origin of veining. Primary fluid inclusions in fluorite indicate that these veins were formed from low temperature (85–169 °C) and high salinity NaCl + CaCl₂ + H₂O type (apparent total salinity: 15.91–22.46 NaCl wt%) hydrothermal fluids, similar to parent fluids of the Alpine-type Pb-Zn deposits. These findings indicate that the Triassic regional fluid circulation systems in the Alpine platform carbonates also affected the area of the Balaton Highland. This is also in agreement with the previously established palinspatic tectonic reconstructions indicating that the Triassic carbonate and basement units in the Balaton Highland area were a part of the Southern Alpine. Similar fluorite veining in phosphorite deposits is also known in the Southern Alpine areas (e.g., Monte San Giorgi, Italy). Raman spectroscopic analyses detected H₂ gas in the vapor phase of the fluid inclusions and a defect-rich fluorite structure in violet to black colored growth zones. This unique phenomenon is assumed to be the result of interaction between the uranium-rich phosphorite and the parent fluids of the epigenetic fluorite veins.

中文翻译：

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巴拉顿高地（匈牙利潘诺尼亚盆地）磷矿床中的后生热液萤石脉：高山三叠纪地台区域流体流动系统的特征

新特提斯王国的中阿尼西期伸展构造在巴拉顿高地（匈牙利西部）中部发展了一个小的、孤立的碳酸盐台地，导致含铀海山磷矿在沉没台地顶部沉积，并产生了一些后生中三叠统萤石脉。碳酸盐的稳定 CO 同位素数据偏离了典型的三叠纪碳酸盐范围，证实了脉纹的表观-热液起源。萤石中的原生流体包裹体表明这些矿脉是由低温（85-169 °C）和高盐度的 NaCl + CaCl ₂ + H _{2 形成的}O 型（表观总盐度：15.91–22.46 NaCl wt%）热液流体，类似于高山型铅锌矿床的母液。这些发现表明，高山台地碳酸盐岩中的三叠纪区域流体循环系统也影响了巴拉顿高地地区。这也与先前建立的古构造重建一致，表明巴拉顿高地地区的三叠纪碳酸盐岩和基底单元是南高山的一部分。在南高山地区（例如，意大利的圣乔治山）也知道磷矿矿床中类似的萤石脉络。拉曼光谱分析检测到 H ₂流体包裹体气相中的气体和紫色至黑色生长区中富含缺陷的萤石结构。这种独特的现象被认为是富铀磷矿与后生萤石脉的母体流体相互作用的结果。