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Mineralogical evolution of the paleogene formations in the kyzyltokoy basin, kyrgyzstan: implications for the formation of glauconite
Bektemirova, Tursunai; Bakirov, Apas; Hu, Ruizhong; He, Hongping; Cai, Yuanfeng; tan, Wei; Chen, Aiqing
2018
Source PublicationClays and Clay Minerals
Volume66Issue:1Pages:43-60
Abstract

Although several hypotheses for the formation of glauconite have been proposed, the sedimentary environment and mechanism of glauconitization are still poorly understood. In this contribution, the mineralogy and chemical compositions of sediments from Paleogene formations (Fms) in the Kyzyltokoy basin (Kyrgyzstan) were examined to better understand glauconitization processes. The samples were analyzed using microscopic petrography, X-ray diffraction (XRD), electron probe microanalysis (EPMA), and X-ray fluorescence (XRF). Interlayered diatomite-argillaceous rocks were newly identified within the diatomites of the Isfara Fm. Glauconite from the Kyzyltokoy basin displayed two stages of maturity: 1) early stage (nascent) glauconite grains composed of ∼3.5% K2O and ∼8% FeOT; 2) late-stage (highly evolved) glauconite grains composed of 7–9% K2O and ∼27% FeOT. The early stage glauconite grains in the Hanabad Fm green clay (green clay is clay with a greenish color) indicate interruptions in glauconitization processes, whereas the (highly) evolved glauconite grains show a completed glauconitization process along the contact between the Hanabad and Sumsar Fms. Hematite was detected in the red clay (clay with reddish color) of the Sumsar Fm and probably formed by glauconite disintegration. Accordingly, the Paleogene Fms depositional conditions were of three types: 1) beginning of glauconitization with interruptions, 2) completion of glauconitization, and 3) glauconite disintegration. Glauconitization in the Kyzyltokoy basin, thus, likely occurred via a combination of dissolution, precipitation, and recrystallization processes.

KeywordCrystallo-chemical Formula Glauconite Maturity Mineralogy Paleogene Formations Sedimentary Environment
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8838
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry of Chinese Academy of Sciences, Guiyang 550002, Guizhou, China
2.CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.Institute of Geology, Kyrgyz National Academy of Science, 30 Erkindik Avenue, Bishkek 720481, Kyrgyzstan
5.State Key Laboratory of Mineral Deposits Research, School of Earth Science and Engineering, Nanjing University, Nanjing, 210093 China
Recommended Citation
GB/T 7714
Bektemirova, Tursunai,Bakirov, Apas,Hu, Ruizhong,et al. Mineralogical evolution of the paleogene formations in the kyzyltokoy basin, kyrgyzstan: implications for the formation of glauconite[J]. Clays and Clay Minerals,2018,66(1):43-60.
APA Bektemirova, Tursunai.,Bakirov, Apas.,Hu, Ruizhong.,He, Hongping.,Cai, Yuanfeng.,...&Chen, Aiqing.(2018).Mineralogical evolution of the paleogene formations in the kyzyltokoy basin, kyrgyzstan: implications for the formation of glauconite.Clays and Clay Minerals,66(1),43-60.
MLA Bektemirova, Tursunai,et al."Mineralogical evolution of the paleogene formations in the kyzyltokoy basin, kyrgyzstan: implications for the formation of glauconite".Clays and Clay Minerals 66.1(2018):43-60.
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