caa a22 4500 445300590 CHVBK 20180317142556.0 cr unu---uuuuu 170323e20100401xx s 000 0 eng 10.1007/s11430-010-0036-9 doi (NATIONALLICENCE)springer-10.1007/s11430-010-0036-9 Mineralogical characteristics of bentonites occurring in Ningcheng and Jianping area, China [Elektronische Daten] [JaRang Gu, YongHee Moon, LiBing Liao, Jie Zhang, HiSoo Moon] This study is focused on the basic mineralogical and chemical characteristics of some selected samples from Jianping (JP) and Ningcheng (NC) area, China. These were studied using X-ray diffraction (XRD), expandability, Greene-Kelly test, specific surface area, cation exchange capacity (CEC), differential thermal analysis (DTA), and chemical analysis. The bulk samples consist of mainly montmorillonites along with appreciable amounts of cristobalite and with small amounts of quartz, feldspar and calcite. The basal spacings of montmorillonites in all these examined samples show at about 1.5 nm, indicating that predominant cations were divalent. Mean crystallite thickness of the present sample lies from 0.449 to 0.710 nm (4.58-7.24 layers). As Greene-Kelly test, samples from Ningcheng area confirmed appreciable amount of beidellite component but samples from Jianping area did not contain anything about it. Surface area of samples varies from 671 to 766 m2 g−1 depending on the amounts of impurities. Analyzed CEC ranges from 70.30 to 82.75 meq 100g−1 in < 2 μm size samples. The DTA curves are considered abnormal type. Samples from Ningcheng area show relatively higher amount of SiO2 than those from Jianping area, possibly due to difference of parent rock type. Trace element (Y, Nb, Ce and Zr) data are plotted on acidic to intermediate composition. It is apparent that no large chemical transfer would have been necessary during alteration. Science China Press and Springer-Verlag Berlin Heidelberg, 2010 montmorillonite nationallicence beidellite nationallicence expandability nationallicence Greene-Kelly test nationallicence trace element nationallicence Gu JaRang Department of Earth System Sciences, Yonsei University, 120-749, Seoul, Korea aut Moon YongHee Institute of Earth Atmosphere, Astronomy BK21 Yonsei University, 120-749, Seoul, Korea aut Liao LiBing School of Materials Science and Technology, China University of Geosciences, 100083, Beijing, China aut Zhang Jie School of Materials Science and Technology, China University of Geosciences, 100083, Beijing, China aut Moon HiSoo Department of Earth System Sciences, Yonsei University, 120-749, Seoul, Korea aut Science China Earth Sciences SP Science China Press 53/4(2010-04-01), 541-549 1674-7313 53:4<541 2010 53 11430 https://doi.org/10.1007/s11430-010-0036-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11430-010-0036-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gu JaRang Department of Earth System Sciences, Yonsei University, 120-749, Seoul, Korea aut NATIONALLICENCE 700 1- Moon YongHee Institute of Earth Atmosphere, Astronomy BK21 Yonsei University, 120-749, Seoul, Korea aut NATIONALLICENCE 700 1- Liao LiBing School of Materials Science and Technology, China University of Geosciences, 100083, Beijing, China aut NATIONALLICENCE 700 1- Zhang Jie School of Materials Science and Technology, China University of Geosciences, 100083, Beijing, China aut NATIONALLICENCE 700 1- Moon HiSoo Department of Earth System Sciences, Yonsei University, 120-749, Seoul, Korea aut NATIONALLICENCE 773 0- Science China Earth Sciences SP Science China Press 53/4(2010-04-01), 541-549 1674-7313 53:4<541 2010 53 11430 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer