Lichenometry in the Cordillera Blanca, Peru

in cooperation with V.Jomelli, A.Ames, and G.Kaser

This paper (Solomina et al., 2006) is a comparison and compilation of lichenometric and geomorphic studies performed by two independent teams in the Cordillera Blanca, Peru, in 1996 and 2002 on 66 "Little Ice Age" moraines of 14 glaciers (FIG. 1). Using eleven new control points (FIG. 2), we recalibrated the initial rapid growth phase of the previously established Rhizocarpon subgenus Rhizocarpon growth curve (FIG. 3). This curve was then used to estimate the age of Little Ice Age moraines. The time of deposition of the most prominent and numerous terminal and lateral moraines on the Pacific-facing side of the Cordillera Blanca (between AD 1590 and AD 1720) corresponds to the coldest and wettest phase in the tropical Andes as revealed by ice core data from Huascaran and Quelccaya (Thompson et al, 2000) (ice core). Less prominent advances occurred between AD 1780 and 1880 (FIG. 4). Agreement of the 1996 and 2002 lichenometric records obtained independently by two teams adds confidence to the reliability of the younger part of the lichenometric curve, presented here. Besides the moraine dating, the improved growth curve might be of interest for archeologists, working on high-elevation sites in Cordillera Blanca.

Selected references

Abbot, M.B., Binford, M.W., Brenner, M and Kelts, K.R., 1997. A 3500 14C yr high resolution record of water-level changes in Lake Titicaca, Bolivia / Peru. Quat. Res. 47, 169-180.

Ames, A., 1998. A Documentation of Glacier Tongue Variations and Lake Development in the Cordillera Blanca, Peru. Zeitschrift fur Gletscherkunde und Glazialgeologie, 34, 1 - 36.

Ames, A., Francou, B., 1995. Cordillera Blanca. Glaciares en la Historia. Bulletin de l'Institut Francais d'Etudes Andines, 24, 37-64.

Ames, A., Munos, G., Verstergui, J., Vigil, R., Zamora, M., and Zapata, M., 1989. Glacier Inventorie of Peru, Unidad de Glaciologia e Hidrologia, Huaraz, Peru.

Broggi, J.A., 1943. La desglaciacion actual de los Andes del Peru. Boletin de la Sociedad Geologia del Peru, 14-15, 59-90.

Clapperton, C.M., 1993. Quaternary Geology and Geomorphology of South America. Amsterdam, London, New York, Tokyo.

Fiedel, S. J., 1987. Prehistory of the Americas. Cambridge University Press, Cambridge.

Hastenrath, S., Ames, A., 1995. Recession of Janamarey glacier in Cordillera Blanca, Peru, during the 20th century. J. Glaciol. 41, 191-196.

Kaser, G., 1999. A review of the modern fluctuations of tropical glaciers. Glob. Planet. Change. 22, 93-103.

Kaser, G., Osmaston, H., 2002. Tropical glaciers. International Hydrology series. Cambridge University Press. Cambridge.

Kaser G., Ames A., Zamora, M., 1990. Glacier Fluctuations and Climate in the Cordillera Blanca, Peru. Ann. Glaciol. 14,136 - 140.

Kaser, G., Juen, I., Georges, C., Gomez, J. , Tamayo, W., 2003. The impact of glaciers on the runoff and the reconstruction of mass balance history from hydrological data in the tropical Cordillera Blanca, Peru. J. Hydrol.288, 130-144.

Kinzl, H., 1942. Gletcherkundliche Begleitworte zur Karte der Cordillera Blanca, Peru. Zeitschrift fur Gletscherkunde und Glazialgeologie. 28, 1-19.

Lliboutry, L., Morales, B., Pautre, A., Schneider B., 1977. Glaciological Problems set by the Control of Dangerous Lakes in Cordillera Blanca, Peru. I. Historical Failures of Morainic Dams, Their Causes and Prevention. J. Glaciol. 18, 239 - 254.

Lumbreras, L. G., 1974. Los origenes de la civilizacion en el Peru. Editorial Milla Batres. Lima.

Mercer, J.H., Palacios, M.O., 1977. Radiocarbon dating of the last glaciation in Peru. Geology. 5, 600-604.

Oppenheim, V., 1945. Las glaciaciones en el Peru. Boletin de la Sociedad Geologica del Peru. 18, 37 - 43.

Rodbell, D.T., 1992. Lichenometric and radiocarbon dating of Holocene glaciation, Cordillera Blanca, Peru. The Holocene. 2,19-29.

Rothlisberger, F., 1987. 10000 Jahre Gletschergeschichte der Erde. Verlag Sauerlander. Aarau.

Schreiber, K., 1987. Conquest and consolidation: a comparison of the Wari and Inca occupations of a highland Peruvian valley. American Antiquity. 52, 266-284.

Seltzer, G.O., 1990. Glacial history and palaeoclimate of the Peruvian-Bolivian Andes. Quat. Sci. Review. 9,137-152.

Sievers, W., 1914. Reise in Peru und Equador, ausgefuehrt 1909. Wissenschaftliche Veroeffentlichungen der Gesellschaft fur Erdkunde zu Leipzig, Band 8. Duncker & Humbolt. Muenchen, Leipzig.

Thompson, L. G., 1996. Climatic changes for the last 2000 years inferred from ice-core evidence in tropical ice cores. In: Jones, P.D., Bradley, R.S., Jouzel, J. (Eds.), Climatic variations and forcing mechanisms of the last 2000 years, NATO ASI Series Global Environmental Change. Berlin , pp.281-295.

Fig. 1 Fig. 2
Fig. 3
Fig. 4

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