Prospecting Glacial Ages and Paleoclimatic Reconstructions Northeastward of Nevado Coropuna (16° S, 73° W, 6377 m), Arid Tropical Andes
This work investigates the timing, paleoclimatic framework and inter-hemispheric teleconnections inferred from the glaciers last maximum extension and the deglaciation onset in the Arid Tropical Andes. A study area was selected to the northeastward of the Nevado Coropuna, the volcano currently cover...
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MDPI AG
2018-08-01
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| Series: | Geosciences |
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| Online Access: | http://www.mdpi.com/2076-3263/8/8/307 |
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| author | Jose Úbeda Martí Bonshoms Joshua Iparraguirre Lucía Sáez Ramón de la Fuente Lila Janssen Ronald Concha Pool Vásquez Pablo Masías |
| author_facet | Jose Úbeda Martí Bonshoms Joshua Iparraguirre Lucía Sáez Ramón de la Fuente Lila Janssen Ronald Concha Pool Vásquez Pablo Masías |
| author_sort | Jose Úbeda |
| collection | DOAJ |
| description | This work investigates the timing, paleoclimatic framework and inter-hemispheric teleconnections inferred from the glaciers last maximum extension and the deglaciation onset in the Arid Tropical Andes. A study area was selected to the northeastward of the Nevado Coropuna, the volcano currently covered by the largest tropical glacier on Earth. The current glacier extent, the moraines deposited in the past and paleoglaciers at their maximum extension have been mapped. The present and past Equilibrium Line Altitudes (ELA and paleoELA) have been reconstructed and the chlorine-36 ages have been calculated, for preliminary absolute dating of glacial and volcanic processes. The paleoELA depression, the thermometers installed in the study area and the accumulation data previously published allowed development of paleotemperature and paleoprecipitation models. The Coropuna glaciers were in maximum extension (or glacial standstill) ~20–12 ka ago (and maybe earlier). This last maximum extension was contemporary to the Heinrich 2–1 and Younger Dryas events and the Tauca and Coipasa paleolake transgressions on Bolivian Altiplano. The maximum paleoELA depression (991 m) shows a colder (−6.4 °C) and moister climate with precipitation ×1.2–×2.8 higher than the present. The deglaciation onset in the Arid Tropical Andes was 15–11 ka ago, earlier in the most southern, arid, and low mountains and later in the northernmost, less arid, and higher mountains. |
| first_indexed | 2024-12-21T13:32:00Z |
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| issn | 2076-3263 |
| language | English |
| last_indexed | 2024-12-21T13:32:00Z |
| publishDate | 2018-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Geosciences |
| spelling | doaj.art-5b2072ab7e8d42edb5c4a231075868b42022-12-21T19:02:17ZengMDPI AGGeosciences2076-32632018-08-018830710.3390/geosciences8080307geosciences8080307Prospecting Glacial Ages and Paleoclimatic Reconstructions Northeastward of Nevado Coropuna (16° S, 73° W, 6377 m), Arid Tropical AndesJose Úbeda0Martí Bonshoms1Joshua Iparraguirre2Lucía Sáez3Ramón de la Fuente4Lila Janssen5Ronald Concha6Pool Vásquez7Pablo Masías8Instituto Geológico Minero y Metalúrgico, Av. Canadá 1470, San Borja 15034, PeruGrupo de Investigación en Geografía Física de Alta Montaña, Departamento de Geografía, Universidad Complutense de Madrid, 28040 Madrid, SpainInstituto Geológico Minero y Metalúrgico, Av. Canadá 1470, San Borja 15034, PeruGuías de Espeleología y Montaña (Speleology and Mountain Guides), Casilla del Mortero, Torremocha de Jarama, 28189 Madrid, SpainGuías de Espeleología y Montaña (Speleology and Mountain Guides), Casilla del Mortero, Torremocha de Jarama, 28189 Madrid, SpainGuías de Espeleología y Montaña (Speleology and Mountain Guides), Casilla del Mortero, Torremocha de Jarama, 28189 Madrid, SpainInstituto Geológico Minero y Metalúrgico, Av. Canadá 1470, San Borja 15034, PeruInstituto Geológico Minero y Metalúrgico, Av. Canadá 1470, San Borja 15034, PeruInstituto Geológico Minero y Metalúrgico, Av. Canadá 1470, San Borja 15034, PeruThis work investigates the timing, paleoclimatic framework and inter-hemispheric teleconnections inferred from the glaciers last maximum extension and the deglaciation onset in the Arid Tropical Andes. A study area was selected to the northeastward of the Nevado Coropuna, the volcano currently covered by the largest tropical glacier on Earth. The current glacier extent, the moraines deposited in the past and paleoglaciers at their maximum extension have been mapped. The present and past Equilibrium Line Altitudes (ELA and paleoELA) have been reconstructed and the chlorine-36 ages have been calculated, for preliminary absolute dating of glacial and volcanic processes. The paleoELA depression, the thermometers installed in the study area and the accumulation data previously published allowed development of paleotemperature and paleoprecipitation models. The Coropuna glaciers were in maximum extension (or glacial standstill) ~20–12 ka ago (and maybe earlier). This last maximum extension was contemporary to the Heinrich 2–1 and Younger Dryas events and the Tauca and Coipasa paleolake transgressions on Bolivian Altiplano. The maximum paleoELA depression (991 m) shows a colder (−6.4 °C) and moister climate with precipitation ×1.2–×2.8 higher than the present. The deglaciation onset in the Arid Tropical Andes was 15–11 ka ago, earlier in the most southern, arid, and low mountains and later in the northernmost, less arid, and higher mountains.http://www.mdpi.com/2076-3263/8/8/307CoropunaArid Tropical Andescosmogenic datingELApaleoclimatic reconstructionsITCZ |
| spellingShingle | Jose Úbeda Martí Bonshoms Joshua Iparraguirre Lucía Sáez Ramón de la Fuente Lila Janssen Ronald Concha Pool Vásquez Pablo Masías Prospecting Glacial Ages and Paleoclimatic Reconstructions Northeastward of Nevado Coropuna (16° S, 73° W, 6377 m), Arid Tropical Andes Geosciences Coropuna Arid Tropical Andes cosmogenic dating ELA paleoclimatic reconstructions ITCZ |
| title | Prospecting Glacial Ages and Paleoclimatic Reconstructions Northeastward of Nevado Coropuna (16° S, 73° W, 6377 m), Arid Tropical Andes |
| title_full | Prospecting Glacial Ages and Paleoclimatic Reconstructions Northeastward of Nevado Coropuna (16° S, 73° W, 6377 m), Arid Tropical Andes |
| title_fullStr | Prospecting Glacial Ages and Paleoclimatic Reconstructions Northeastward of Nevado Coropuna (16° S, 73° W, 6377 m), Arid Tropical Andes |
| title_full_unstemmed | Prospecting Glacial Ages and Paleoclimatic Reconstructions Northeastward of Nevado Coropuna (16° S, 73° W, 6377 m), Arid Tropical Andes |
| title_short | Prospecting Glacial Ages and Paleoclimatic Reconstructions Northeastward of Nevado Coropuna (16° S, 73° W, 6377 m), Arid Tropical Andes |
| title_sort | prospecting glacial ages and paleoclimatic reconstructions northeastward of nevado coropuna 16° s 73° w 6377 m arid tropical andes |
| topic | Coropuna Arid Tropical Andes cosmogenic dating ELA paleoclimatic reconstructions ITCZ |
| url | http://www.mdpi.com/2076-3263/8/8/307 |
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