revista cuaternario y geomorfología
TRANSCRIPT
Last Glacial Ma imum and deglacia on of Ampato volcanic comple , Southern Peru
El l o Má i o Avance Glaciar y la deglaciación del Co ple o olcánico A pato, Sur de Per
Alcalá, J. (1), Palacios, D. (1), Zamorano, J.J. (2) and Vázquez-Selem, L. (2)
Revista Cuaternario y Geomorfología
Abstract
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Keywords: -
Resumen
2.
Crea ve Co ons . .
Rev. C. & G., 25 (1-2), 121-1
121
Rev. C. & G., 25 (1-2), 121-1
122
1. Introduc on
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especially in the Andes, to improve our un-
-
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-ingly dependent on these water reserves
using current climate models show that the -
st century suggest that the tropical troposphere will present
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tropical Andes is the western volcanic
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increase in temperature and decrease in
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which would have important implications
2 -
Palabras clave:
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123
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2. Regional Se ng
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Figura 1. A. agen de satelite de la Cordillera Occidental de los Andes centrales donde se uestra la local-ización del Co ple o volcánico A pato (C A). . agen tridi ensional del A C de orte a Sur.
Rev. C. & G., 25 (1-2), 121-1
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Ar to -
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B -
Figura . A. etalle de un blo ue orrénico del LGMA en el valle de Huayuray, localizado en la vertiente norte del volcán HualcaHualca (Muestra Hualca 15. S 1. W ,1 sn ). ovie bre de 2 5. B. etalle de un blo ue orrénico del GR- localizado en la vertiente norte del volcán HualcaHualca (Muestra Hualca
15. S 1. W ,512 sn ).
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Figura 2. ista panorá ica de la vertiente este del C A desde el altiplano de Patapa pa. e orte a Sur H-volcán HualcaHualca S- olcán Sabancaya A-volcán A pato.
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th
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Stipa and Festuca
Azorella co pacta -cular plants disappear almost completely and only mosses and lichens survive.
-
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-tural land and an incipient tourism in-
those glaciers.
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Figura . Mapa geo orfológico del C A. El círculo deli ita el valle de Huayuray, situado en la vertiente norte del volcán HualcaHualca.
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3. Materials and Methods
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-vance I (GRA-I) and Glacial Readvance II (GRA-
Figura 5. Evolución de los glaciares del valle de Huayuray desde la L A hasta el a o 2 .
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‘simple standard valley glacier (Osmaston,
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S
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-sity and physical-chemical processing and
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Phase Area (km2)Area decrease with
respect to LGMA ( )Minimum glacier
al tude (masl)ELA (masl )
ELA di erence (with respect to 1955 ELA)
Last Glacial -
Glacial Readvance I (GR-I)
Glacial Readvance II (GRA-II)
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Tabla 1. rea, altitud íni a y ELA de los glaciares en el valle de Huayuray (vertiente orte del volcán HualcaHualca).
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during the dissolution. The -
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ments, U, Th, Sm and Gd were determined
and
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4. Results
-no. On Ampato the ice tongues reached a
--
side, where the moraines show a minimum
important re-advance glaciers reached
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Figura . etalle del apa geo orfológico del C A, donde se uestran las for as glaciares del valle de Huay-uray, situado en la vertiente norte del volcán HualcaHualca. Los detalles de las uestras obtenidas para su
datación absoluta ediante Cl se encuentran en las tablas 2 y .
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2 2 in
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2 2 less than in the
-2
2,
2,
2
-a priori
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Figura . agen de satelite (Mrsid, 2 , ASA), donde se uestra la localización de las uestras Patapa pa y Hualca 1 (ver Tabla 2).
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5. Discussion
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(the same ones we used in our study),
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the increasing aridity towards the south,
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is important to point out that the similar-
to compare results.
Sample Loca on Phase Sample type E posure age (kyr)
GR-I
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Tabla 2. Edades obtenidas ediante el análisis del isótopo cos ogénico Cl de blo ues orrénicos del valle de Huayuray (vertiente norte del volcán HualcaHualca) y superficies estriadas del altiplano de Patapa pa.
Las edades de e posición son para una erosión superficial de valor . El error está relacionado con la incer-tidu bre del análisis AMS.
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131
Patapampa altiplano, Southern Peru.Tabla . atos de ca po y de laboratorio de las orrenas uestreadas en el valle de Huayuray (vertiente norte
del volcán HualcaHualca) y del altiplano de Patapa pa, Sur de Per .
sample ID
map unitGR-I
Glacial Polish
( 321
uncertainty( 23
(g cm-3)
(cm)
water content (cm3 3)
(m)
(decimal degrees)
longitude(decimal degrees)
snow shielding (unitless)
total shielding (unitless)
(g cm-2)
LOI
2O
Al2O3
SiO2
P2O
2O
TiO2
2O3
(ppm)
(ppm) 21 22.1
Gd (ppm)
U (ppm) 3.2
Th (ppm) 13.1
sample mass (g)
(g)
(g g-1) 12 22.1
(
(
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132
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-tains such as the Andes in the northern and
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-dillera Oriental, where mountains at a simi-
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-taining results very similar to our results on
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3
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It is important to point out that moraines
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temperature-driven glaciers in the eastern
in the drier western part are moisture-limited -
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6. Conclusions
-mogenic
2 -2
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2
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other Andean areas dated with cosmogenic
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Acknowledgements
GEOGRAF A F S CA E ALTA MO TA A
-Progra a de for ación de Personal niversi-
tario (FP )
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