IMHE OpenIR  > Journal of Mountain Science  > Journal of Mountain Science-2017  > Vol14 No.6
Formation and evolution of Emeishan basalt saprolite in vadose zones of Touzhai landslide source rockmass
YANG Ji-qing; XU Ze-min; ZHANG Rui; CHEN Ji-pu; REN Zhe; LUO Rong-zhang; ZHANG Xiu-shuo
Corresponding AuthorXU Ze-min
2017-06
Source PublicationJournal of Mountain Science
ISSN1672-6316
Volume14Issue:6Pages:1174-1184
Subtype期刊论文
AbstractIn order to explain the formation process of slope hazards, and to identify the key factors leading to instability of a slope,Emeishanbasalt saprolite in vadose zones of the Touzhai landslide in Zhaotong, Yunnan, was studied. The formation and evolution of Emeishan basalt saprolite was examined using, amongst other techniques, field investigations, thin section analysis, scanning electron microscopy (SEM) observations, chemical analysis, physical and water-physical property tests of rock masses.Fieldobservations revealed that the majority of the weathered rock blocks were presented as a concentric layer structure in which an internal corestone was enveloped with several layers of external saprolized crust. Chemical and mineralogical analysis identified that iron was the most sensitive element and that the weathering progress usually started with the oxidation of Fe2+ to Fe3+ in rock blocks. Alkaline elements such as Si, Ca, Mg, Na and K were also dissolved and Fe and Al were concentrated in saprolized crusts. Results indicated that loss on ignition (LOI) also increased significantly. SEM results showed that the weathering intensity of the basalt blocks decreased gradually from the outside to the inside, and the mineral morphology significantly differed on both sides of the weathering front. The saprolized crusts presented cellular microstructure features due to the generation of micropore and clay minerals. Thin section analysis showed that plagioclase was relatively more stable than pyroxene and chlorite during weathering. With a centripetal propagation of the weathering front, saprolized crusts became thicker and corestones became smaller; fresh Emeishan basalt blocks gradually turned into saprolized blocks. Due to the loose structure and low strength of saprolite, the quality of the Emeishan basalt mass significantly deteriorated, this being a potentially important factor which caused the Touzhai landslide to occur.
KeywordVadose Zone Emeishan Basalt Scanning Electron Microscopy Saprolite Corestone Touzhai Landslide
DOI10.1007/s11629-016-4169-y
Indexed BySCI
Language英语
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/18735
CollectionJournal of Mountain Science_Journal of Mountain Science-2017_Vol14 No.6
Recommended Citation
GB/T 7714
YANG Ji-qing,XU Ze-min,ZHANG Rui,et al. Formation and evolution of Emeishan basalt saprolite in vadose zones of Touzhai landslide source rockmass[J]. Journal of Mountain Science,2017,14(6):1174-1184.
APA YANG Ji-qing.,XU Ze-min.,ZHANG Rui.,CHEN Ji-pu.,REN Zhe.,...&ZHANG Xiu-shuo.(2017).Formation and evolution of Emeishan basalt saprolite in vadose zones of Touzhai landslide source rockmass.Journal of Mountain Science,14(6),1174-1184.
MLA YANG Ji-qing,et al."Formation and evolution of Emeishan basalt saprolite in vadose zones of Touzhai landslide source rockmass".Journal of Mountain Science 14.6(2017):1174-1184.
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