Mineral composition of the Sumer Formation sediments near the village of Sumer (Northwestern Bulgaria)

Madlena Tsvetkova, Ivanina Sergeeva, Olga Veleva
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Abstract

Previous analyses of the Sumer Formation sediments have been limited to samples up to 400 m deep near the village of Varbitsa. This study extends the investigation, exploring the mineral composition and carbonate content of the sediments near the village of Sumer. Samples were collected from two outcrops at the Montana-Vratsa Road junction (C-1) and the Shugavitsa river basin (C-2). Both outcrops revealed a quartz and calcite content of approximately 75–80%, with a significant variance in calcite levels: 11.4% at C-1 and 31.3% at C-2. Illite (4.5%) and kaolinite (2%), these clay minerals essential for the marls’ sorption properties, were only detected in C-1 samples. The C-2 outcrop exhibits a higher carbonate content (17.65%) compared to C-1 (10.85%). These findings mirror the mineral composition trends observed near Varbitsa, where the content of illite and kaolinite increases with depth. The results provide valuable data for future geochemical and geotechnical evaluations pertinent to the development of geological repositories.
苏美尔村(保加利亚西北部)附近苏美尔地层沉积物的矿物成分
以前对苏美尔地层沉积物的分析仅限于瓦尔比萨村附近最深 400 米的样本。本研究扩大了调查范围,探索苏美尔村附近沉积物的矿物成分和碳酸盐含量。样本采集自蒙大拿-瓦尔比察公路交界处(C-1)和舒加维察河流域(C-2)的两个露头。两个露头均显示石英和方解石含量约为 75-80%,方解石含量差异显著:C-1 为 11.4%,C-2 为 31.3%。伊利石(4.5%)和高岭石(2%)是泥灰岩吸附特性所必需的粘土矿物,仅在 C-1 样品中检测到。C-2 露头的碳酸盐含量(17.65%)高于 C-1(10.85%)。这些发现反映了在 Varbitsa 附近观察到的矿物成分趋势,即伊利石和高岭石的含量随着深度的增加而增加。这些结果为今后与地质储藏库开发有关的地球化学和岩土工程评估提供了宝贵的数据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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