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Evaluation of geomechanical and geochemical properties in weathered metamorphic rocks in tropical environment: a case study from Samanalawewa hydropower project, Sri Lanka

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Abstract

The effect of weathering on changes of physical and mechanical properties of rocks is a prime concern in the perspectives of geology and engineering. These properties have been studied mostly on weathered igneous and sedimentary rocks under humid climates. Studies on weathering of metamorphic rocks, especially under a tropical climate, are rare. This study evaluates change of physical, mechanical, chemical, and mineralogical properties of metamorphic rocks that weather under tropical climatic conditions. Samanalawewa hydropower project area was selected for this study, because rapid weathering of a metamorphic rock (sillimanite garnet gneiss) was observed in the project site. Fresh rocks that are subjected to weathering have reached to completely weathered condition in a time span of less than 25 years in this area. Visually assessed weathering grades were physically and mechanically evaluated using bulk density, equotip hardness, porosity, specific gravity, point load strength, and slake durability tests. Mechanical properties, especially point load strength, change rapidly at the onset of weathering, while chemical properties show significant changes at later stages of weathering. Mineralogical changes such as appearance of secondary minerals are at the latter part of weathering. Physical properties gradually change during weathering. The observed changes in physical, mechanical and chemical properties indicate that their variations during weathering are independent of lithology and climatic conditions.

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References

  • Amada, T. and Okatani, N., 1991, Experimental study on weathering of the granite. Journal of the Japan Society of Erosion Control Engineering, 43, 3–10.

    Google Scholar 

  • Anderson, D.H. and Hawkes, H.E., 1958, Relative mobility of the common elements in weathering of some schist and granite areas. Geochimica et Cosmochimica Acta, 14, 204–210.

    Article  Google Scholar 

  • Aoki, H. and Matsukura, Y., 2008, Estimating the unconfined compressive strength of intact rocks from Equotip hardness. Bulletin of Engineering Geology and the Environment, 67, 23–29.

    Article  Google Scholar 

  • Arel, E. and Tugrul, A., 2001, Weathering and its relation to geomechanical properties of Cavusbasi granitic rocks in northwestern Turkey. Bulletin of Engineering Geology and the Environment, 60, 123–133.

    Article  Google Scholar 

  • Aristizábal, E., Roser, B., and Yokota, S., 2005, Tropical chemical weathering of hillslope deposits and bedrock source in the Aburrá Valley, northern Colombian Andes. Engineering Geology, 81, 389–406.

    Article  Google Scholar 

  • Boardman, J., 2015, Rapid and selective clast weathering on an alluvial fan, eastern Karoo, South Africa. CATENA, 126, 37–42.

    Article  Google Scholar 

  • Bormann, B.T., Wang, D., Snyder, M.C., Bormann, F.H., Benoit, G., and April, R., 1998, Rapid, plant-induced weathering in an aggrading experimental ecosystem. Biogeochemistry, 43, 129–155.

    Article  Google Scholar 

  • Brantley, S.L., 2008, Analysis of Rates of Geochemical Reactions. In: Brantley, S.L., Kubicki, J.D., and White, A.F. (eds.), Kinetics of Water-Rock Interaction. Springer, New York, p. 1–37.

    Chapter  Google Scholar 

  • Brantley, S.L. and Chen, Y., 1995, Chemical weathering rates of pyroxenes and amphiboles. Reviews in Mineralogy and Geochemistry, 31, 119–172.

    Google Scholar 

  • Broch, E. and Franklin, J.A., 1972, The point-load strength test. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 9, 669–676.

    Article  Google Scholar 

  • Chen, J., Blume, H.P., and Beyer, L., 2000, Weathering of rocks induced by lichen colonization–a review. CATENA, 39, 121–146.

    Article  Google Scholar 

  • Coe, A., Argles, T., Rothery, D., and Spicer, R., 2010, Geological Field Techniques (1st edition). Wiley-Blackwell, Milton Keynes, 336 p.

    Google Scholar 

  • Consolmagno, G.J.S.J. and Britt, D.T., 1998, The density and porosity of meteorites from the Vatican collection. Meteoritics & Planetary Science, 33, 1231–1241.

    Article  Google Scholar 

  • Cooray, P.G., 1984, An introduction to the geology of Sri Lanka (Ceylon) (2nd edition). National Museums of Sri Lanka Publication, Colombo, 340 p.

    Google Scholar 

  • Cooray, P.G., 1994, The precambrian of Sri Lanka: a historical review. Precambrian Research, 66, 3–18.

    Article  Google Scholar 

  • Dearman, W.R., Baynes, F.J., and Irfan, T.Y., 1978, Engineering grading of weathered granite. Engineering Geology, 12, 345–374.

    Article  Google Scholar 

  • Dhakal, G., Yoneda, T., Kato, M., and Kaneko, K., 2002, Slake durability and mineralogical properties of some pyroclastic and sedimentary rocks. Engineering Geology, 65, 31–45.

    Article  Google Scholar 

  • Duzgoren-Aydin, N.S. and Aydin, A., 2003, Chemical heterogeneities of weathered igneous profiles: implications for chemical indices. Environmental and Engineering Geoscience, 9, 363–376.

    Article  Google Scholar 

  • Fookes, P.G., Gourley, C.S., and Ohikere, C., 1988, Rock weathering in engineering time. Quarterly Journal of Engineering Geology and Hydrogeology, 21, 33–57.

    Article  Google Scholar 

  • Franklin, J.A. and Chandra, R., 1972, The slake-durability test. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 9, 325–328.

    Article  Google Scholar 

  • Goldich, S.S., 1938, A study in rock-weathering. The Journal of Geology, 42, 17–58.

    Article  Google Scholar 

  • Goodman, R.E., 1989, Introduction to Rock Mechanics (2nd edition). John Wiley & Sons, New York, 580 p.

    Google Scholar 

  • Grant, W.H., 1964, Chemical weathering of biotite–plagioclase gneiss. Clays and Clay Minerals, 12, 455–463.

    Article  Google Scholar 

  • Guan, P., Ng, C.W.W., Sun, M., and Tang, W., 2001, Weathering indices for rhyolitic tuff and granite in Hong Kong. Engineering Geology, 59, 147–159.

    Article  Google Scholar 

  • Gupta, A.S. and Rao, S.K., 1998, Index properties of weathered rocks: inter-relationships and applicability. Bulletin of Engineering Geology and the Environment, 57, 161–172.

    Article  Google Scholar 

  • Gupta, A.S. and Rao, S.K., 2001, Weathering indices and their applicability for crystalline rocks. Bulletin of Engineering Geology and the Environment, 60, 201–221.

    Article  Google Scholar 

  • Hachinohe, S., Hiraki, N., and Suzuki, T., 2000, Rates of weathering and temporal changes in strength of bedrock of marine terraces in Boso Peninsula, Japan. Engineering Geology, 55, 29–43.

    Article  Google Scholar 

  • Hack, H.R.G.K., Hingira, J., and Verwaal, W., 1993, Determination of discontinuity wall strength by Equotip and ball rebound tests. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 30,151–155.

    Article  Google Scholar 

  • Harnois, L., 1988, The CIW index: A new chemical index of weathering. Sedimentary Geology, 55, 319–322.

    Article  Google Scholar 

  • Harnois, L. and Moore, J.M., 1988, Geochemistry and origin of the Ore Chimney Formation, a transported paleoregolith in the Grenville Province of southeastern Ontario, Canada. Chemical Geology, 69, 267–289.

    Article  Google Scholar 

  • Hodder, A.P.W. and Hetherington, J.R., 1991, A quantitative study of the weathering of greywacke. Engineering Geology, 31, 353–368.

    Article  Google Scholar 

  • Irfan, T.Y., 1996, Mineralogy, fabric properties and classification of weathered granites in Hong Kong. Quarterly Journal of Engineering Geology and Hydrogeology, 29, 5–35.

    Article  Google Scholar 

  • Irfan, T.Y. and Dearman, W.R., 1978a, The engineering petrography of a weathered granite in Cornwall, England. Quarterly Journal of Engineering Geology and Hydrogeology, 11, 233–244.

    Article  Google Scholar 

  • Irfan, T.Y. and Dearman, W.R., 1978b, Engineering classification and index properties of a weathered granite. Bulletin of the International Association of Engineering Geology, 17, 79–90.

    Article  Google Scholar 

  • Jayawardena, U.

  • de S., 2011, Correlations between Some Strength Properties of Metamorphic Rocks of Sri Lanka. Journal of the Geological Society of Sri Lanka, 14,65–69.

    Google Scholar 

  • Jayawardena, U. de S., 2003, Use of correlation between ultrasonic velocity and point load strength of weathered rock. Journal of Geological Society of Sri Lanka, 11, 107–114.

    Google Scholar 

  • Jayawardena, U. de S. and Izawa, E., 1994a, A new chemical index of weathering for metamorphic silicate rocks in tropical regions: A study from Sri Lanka. Engineering Geology, 36, 303–310.

    Article  Google Scholar 

  • Jayawardena, U. de S. and Izawa, E., 1994b, Application of present indices of chemical weathering for Precambrian metamorphic rocks in Sri Lanka. Bulletin of the International Association of Engineering Geology, 49, 55–61.

    Article  Google Scholar 

  • Jin, Z., Cao, J., Wu, J., and Wang, S., 2006, A Rb/Sr record of catchment weathering response to Holocene climate change in Inner Mongolia. Earth Surface Processes and Landforms, 31, 285–291.

    Article  Google Scholar 

  • Katz, M.B., 1978, Sri Lanka in Gondwanaland and the evolution of the Indian Ocean. Geological Magazine, 115, 237.

    Article  Google Scholar 

  • Kim, S. and Park, H.-D., 2003, The relationship between physical and chemical weathering indices of granites around Seoul, Korea. Bulletin of Engineering Geology and the Environment, 62, 207–212.

    Article  Google Scholar 

  • Ledin, M. and Pedersen, K., 1996, The environmental impact of mine wastes–Roles of microorganisms and their significance in treatment of mine wastes. Earth-Science Reviews, 41, 67–108.

    Article  Google Scholar 

  • Ma, J.L., Wei, G.J., Xu, Y.G., Long, W.G., and Sun, W.D., 2007, Mobilization and re-distribution of major and trace elements during extreme weathering of basalt in Hainan Island, South China. Geochimica et Cosmochimica Acta, 71, 3223–3237.

    Article  Google Scholar 

  • Marques, E.A.G., Barroso, E.V., Menezes Filho, A.P., and Vargas, E.

  • do A., 2010, Weathering zones on metamorphic rocks from Rio de Janeiro–Physical, mineralogical and geomechanical characterization. Engineering Geology, 111, 1–18.

    Article  Google Scholar 

  • Matsukura, Y., Hattanji, T., Oguchi, C.T., and Hirose, T., 2007, Ten year measurements of weathering rates of rock tablets on a forested hillslope in a humid temperate region, Japan. Zeitschrift für Geomorphologie, Supplementary Issues, 51, 27–40.

    Article  Google Scholar 

  • Middelburg, J.J., Van Der Weijden, C.H., and Woittiez, J.R.W., 1988, Chemical processes affecting the mobility of major, minor and trace elements during weathering of granitic rocks. Chemical Geology, 68, 253–273.

    Article  Google Scholar 

  • Moon, V. and Jayawardane, J., 2004, Geomechanical and geochemical changes during early stages of weathering of Karamu Basalt, New Zealand. Engineering Geology, 74, 57–72.

    Article  Google Scholar 

  • Nagel, K.-H., 1992, Limits of the geological predictions constructing the Samanalawewa pressure tunnel, Sri Lanka. Bulletin of the International Association of Engineering Geology, 45, 97–110.

    Article  Google Scholar 

  • Nesbitt, H. and Young, G., 1982, Early Proterozoic climates and plate motions inferred from major element chemistry of lutites. Nature, 299, 715–717.

    Article  Google Scholar 

  • Nesbitt, H.W. and Young, G.M., 1984, Prediction of some weathering trends of plutonic and volcanic rocks based on thermodynamic and kinetic considerations. Geochimica et Cosmochimica Acta, 48, 1523–1534.

    Article  Google Scholar 

  • Oguchi, C.T., 2013, Weathering rinds: Formation processes and weathering rates. In: Shroder, J.F. (ed.), Treatise on Geomorphology. Academic Press, San Diego, p. 98–110.

    Chapter  Google Scholar 

  • Oguchi, C.T., Hatta, T., and Matsukura, Y., 1999, Weathering rates over 40,000 years based on changes in rock properties of porous rhyolite. Physics and Chemistry of the Earth, Part A: Solid Earth and Geodesy, 24, 861–870.

    Article  Google Scholar 

  • Patino, L.C., Velbel, M.A., Price, J.R., and Wade, J.A., 2003, Trace element mobility during spheroidal weathering of basalts and andesites in Hawaii and Guatemala. Chemical Geology, 202, 343–364.

    Article  Google Scholar 

  • Price, J.R. and Velbel, M.A., 2003, Chemical weathering indices applied to weathering profiles developed on heterogeneous felsic metamorphic parent rocks. Chemical Geology, 202, 397–416.

    Article  Google Scholar 

  • Rollings, H.R., 1993, Using Geochemical Data: Evaluation, Presentation, Interpretation (1st edition). Pearson Prantice Hall, Essex, 356 p.

    Google Scholar 

  • Ruxton, B.P., 1968, Measures of the degree of chemical weathering of rocks. The Journal of Geology, 76, 518–527.

    Article  Google Scholar 

  • Swoboda-Colberg, N.G. and Drever, J.I., 1993, Mineral dissolution rates in plot-scale field and laboratory experiments. Chemical Geology, 105, 51–69.

    Article  Google Scholar 

  • Tating, F., Hack, R., and Jetten, V., 2013, Engineering aspects and time effects of rapid deterioration of sandstone in the tropical environment of Sabah, Malaysia. Engineering Geology, 159, 20–30.

    Article  Google Scholar 

  • Taylor, S.R. and McLennan, S.M., 1985, The continental crust: its composition and evolution. Blackwell Scientific Publications, Oxford, 312 p.

    Google Scholar 

  • Thorn, C.E., Darmody, R.G., Dixon, J.C., and Schlyter, P., 2002, Weathering rates of buried machine-polished rock disks, Kärkevagge, Swedish Lapland. Earth Surface Processes and Landforms, 27, 831–845.

    Article  Google Scholar 

  • Tuncer, E.R. and Lohnes, R.A., 1977, An engineering classification for certain basalt-derived lateritic soils. Engineering Geology, 11, 319–339.

    Article  Google Scholar 

  • Ulusay, R. and Hudson, J.A., 2007, The complete ISRM suggested methods for rock characterization, testing and monitoring: 1974–2006. International Society on Rock Mechanics, Ankara, 628 p.

    Google Scholar 

  • Van der Weijden, C.H. and Pacheco, F.A.L., 2003, Hydrochemistry, weathering and weathering rates on Madeira island. Journal of Hydrology, 283, 122–145.

    Article  Google Scholar 

  • Velbel, M.A., 1999, Bond strength and the relative weathering rates of simple orthosilicates. American Journal of Science, 299, 679–696.

    Article  Google Scholar 

  • Vithanage, P.W., 1970, A study of the geomorphology and the morphotectonics of Ceylon. Proceedings of the Seminar on Geochemical Prospecting Methods and Techniques, United Nations, New York, p. 391–405.

    Google Scholar 

  • Vithanage, P.W., 1989, Report on the geology and structure of the quarry site area. Samanalawewa HEP, 68 p.

    Google Scholar 

  • White, A.F. and Blum, A.E., 1995, Effects of climate on chemical weathering in watersheds. Geochimica et Cosmochimica Acta, 59, 1729–1747.

    Article  Google Scholar 

  • White, A.F., Blum, A.E., Bullen, T.D., Vivit, D. V., Schulz, M., and Fitzpatrick, J., 1999, The effect of temperature on experimental and natural chemical weathering rates of granitoid rocks. Geochimica et Cosmochimica Acta, 63, 3277–3291.

    Article  Google Scholar 

  • White, A.F. and Brantley, S.L., 1995, Chemical weathering rates of silicate minerals: an overview. Reviews in Mineralogy and Geochemistry, 31, 1–22.

    Google Scholar 

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Authors and Affiliations

  1. Mineral Resources and Technology, Department of Science and Technology, Uva Wellassa University, Badulla, 90000, Sri Lanka

    Dashan T. Udagedara

  2. Department of Civil and Environment Engineering, Saitama University, 255, Shimo Okubo, Sakura-Ku, Saitama, 338-8570, Japan

    Chiaki T. Oguchi

  3. Department of Geology, University of Peradeniya, Peradeniya, 20000, Sri Lanka

    Jagath K. Gunatilake

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  1. Dashan T. Udagedara
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  2. Chiaki T. Oguchi
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  3. Jagath K. Gunatilake
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Correspondence to Dashan T. Udagedara.

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Udagedara, D.T., Oguchi, C.T. & Gunatilake, J.K. Evaluation of geomechanical and geochemical properties in weathered metamorphic rocks in tropical environment: a case study from Samanalawewa hydropower project, Sri Lanka. Geosci J 21, 441–452 (2017). https://doi.org/10.1007/s12303-016-0060-7

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