Magnesium calcite, which is usually observed in many natural low-temperature environments, was identified in Triassic limestones of the Polish part of the Germanic Basin. The occurrence of unstable magnesium calcite in Triassic limestones is remarkable. High-Mg calcite was identified in all beds of the Muschelkalk Karchowice Formation: Lower Crinoidea Beds, Lower Biohermal Beds, Upper Crinoidea Beds and Upper Biohermal Beds. The general chemical formulas of magnesium calcite of mentioned unites are: (Ca0.87–0.80,Mg0.13–0.20)CO3, (Ca0.83–0.75,Mg0.17–0.25)CO3, (Ca0.81,Mg0.19)CO3, (Ca0.78–0.77,Mg0.22–0.23)CO3 respectively. This mineral originated probably during the early stage of diagenesis, during compaction of limestones deposited in a warm, shallow marine environment. Some amounts of magnesium come from high-Mg skeletons of marine organisms (such as echinoderms). Diagnenetic processes and the conditions in seawater, especially higher salinity, influence the preservation of high magnesium calcite in the Muschelkalk limestone of the Polish part of the Germanic Basin.

中文翻译：

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日耳曼盆地波兰部分 Muschelkalk 石灰岩中的镁方解石

通常在许多天然低温环境中观察到的镁方解石在日耳曼盆地波兰部分的三叠纪石灰岩中被发现。三叠系灰岩中不稳定镁方解石的出现是显着的。在 Muschelkalk Karchowice 组的所有层中都发现了高镁方解石：下海百合床、下生物群床、上海百合床和上生物群床。上述单元镁方解石的一般化学式为：(Ca0.87–0.80,Mg0.13–0.20)CO3, (Ca0.83–0.75,Mg0.17–0.25)CO3, (Ca0.81,Mg0.19) )CO3, (Ca0.78–0.77,Mg0.22–0.23)CO3 分别。这种矿物可能起源于成岩作用的早期阶段，即沉积在温暖浅海环境中的石灰岩的压实过程。一些镁来自海洋生物（如棘皮动物）的高镁骨骼。诊断过程和海水条件，尤其是较高的盐度，影响了日耳曼盆地波兰部分 Muschelkalk 石灰岩中高镁方解石的保存。