JI C X, LI Y R.Study on mineral contents and crystallization characteristics of calcareous nodules in loess of Shouyang area，Shanxi Province[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(2):71-76.

doi:10.16186/j.cnki.1673-9787.2021010075

Received:2021/01/18

Revised:2021/03/03

Published:2023/03/25

Study on mineral contents and crystallization characteristics of calcareous nodules in loess of

 Shouyang area，Shanxi Province

JI Chunxu, LI Yanrong

College of Mining Engineering，Taiyuan University of Technology，Taiyuan 030024，Shanxi，China

Abstract:In order to explore the mineral composition and crystallization characteristics，the typical gestalt calcareous nodules in Lishi loess in Shouyang area of Shanxi Province were taken as the research object.The mineral mass fraction in complete calcareous nodules were analyzed by X-ray diffraction（XRD），the distribution，shape and crystallization degree of mineral particles were observed by scanning electron microscope（SEM），and the internal density，mineral distribution，mineral morphology and contact relationship of nodules were determined according to the element mass fraction of energy spectrum.The results showed that the mineral composition of nodules was calcite，quartz，clay，plagioclase and potassium feldspar，and calcite migrated to the center obviously.From the outer layer to the center，the volume fraction of calcite increased by 16%，while other minerals decreased by 34% ~ 47%.The carbonates inside the nodules were all secondary microcrystalline calcite，which indicated that the temperature was low when the nodule was formed.The research results could provide theoretical basis and engineering reference for the formation and climate evolution of calcareous nodules in loess under similar conditions.

Key words:calcareous nodule;mineral content;crystallization characteristic;climate evolution

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