Manganese carbonate minerals and their alteration products in Silurian metalliferous nodules from the region of Asaritsa peak, West Balkan Mountain

IF 0.3 Q4 GEOSCIENCES, MULTIDISCIPLINARY Spisanie Na B Lgarskoto Geologichesko Druzhestov-Review of the Bulgarian Geological Society Pub Date : 2022-12-01 DOI:10.52215/rev.bgs.2022.83.3.97

A. Hikov, Elitsa Stefanova, V. Sachanski, Z. Milakovska, Milen Stavrev, K. Kouzmanov, S. Chavdarova, S. Georgiev

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Abstract

The studied Silurian nodules have hard light cores and dark shells. The cores consist of quartz with disseminated zonal carbonate mineral and pyrite. Zones in the carbonate have a variable composition from Mn-containing siderite, ankerite and dolomite to mixed Fe-Mn carbonate and Fe-containing rhodochrosite. The nodule shells are composed of quartz, chlorite, sericite, goethite, Mn-Fe oxyhydroxides and siderite. Fe-Mn oxyhydroxides in the nodule shells are formed due to an alteration of the carbonate minerals and inherited their composition. The formation of the nodules with Fe- and Mn-carbonates is related to diagenetic processes under reducing conditions of low Eh and high pH values. Later, carbonate minerals were altered into Fe-Mn oxyhydroxides. These alteration changes can be related to the influence of later magmatic activity in the area. An example of this activity is the presence of an igneous bodies established on both sides of the section.

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西巴尔干山阿萨里察峰地区志留系金属结核中的碳酸锰矿物及其蚀变产物

所研究的志留纪结核具有坚硬的浅色核和深色壳。岩芯由石英、浸染状带状碳酸盐矿物和黄铁矿组成。碳酸盐中的区域具有可变的组成，从含锰菱铁矿、铁白云石和白云石到混合的Fe-Mn碳酸盐和含铁菱锰矿。结核壳由石英、绿泥石、绢云母、针铁矿、锰铁氢氧化物和菱铁矿组成。结核壳中的Fe-Mn氢氧化物是由于碳酸盐矿物的蚀变而形成的，并继承了它们的组成。含铁和锰碳酸盐结核的形成与低Eh和高pH值还原条件下的成岩过程有关。后来，碳酸盐矿物被蚀变为铁锰氢氧化物。这些蚀变变化可能与该地区后期岩浆活动的影响有关。这种活动的一个例子是在剖面两侧都存在火成体。

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Spisanie Na B Lgarskoto Geologichesko Druzhestov-Review of the Bulgarian Geological Society GEOSCIENCES, MULTIDISCIPLINARY-

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