Geochemical characteristics of the slip zones of a landslide in granitic saprolite,Hong Kong: implications for their development and microenvironments |
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| Authors: | B-P?Wen N?S?Duzgoren-Aydin Email author" target="_blank">A?AydinEmail author |
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| Institution: | (1) Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China;(2) Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China |
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| Abstract: | Geochemical investigations of the slip zones of a landslide in granitic saprolite revealed that they have signatures distinct from their host materials. These distinctions include stronger Si depletion, higher Al enrichment, greater LOI, significant fixations of Mn, Ba and Ce, stronger negative Eu anomalies, and greater accumulations of other rare earth elements (REE). Altogether, these geochemical characteristics indicate that: (a) the slip zones have greater abundance of clays, consistent with field and microscopic observations; (b) concentration of clay size particles within the slip zones may have been from downward leaching and deposition, and lateral transportation of Al-Si solutions and colloids through pores and fractures within the saprolite; and (c) there were prevailing oxidation and poor drainage, and occasional reduction conditions within the slip zones. It was concluded that geochemical analyses could be effective in gathering clues for understanding the development and nature of slip zones in landslide investigations. |
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| Keywords: | Geochemistry Slip zone Saprolite Hong Kong |
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