The Maximum Ice Age (Würmian, Last Ice Age, LGM) Glaciation of the Himalaya – A Glaciogeomorphological Investigation of Glacier Trim-lines, Ice Thicknesses and Lowest Former Ice Margin Positions in the Mt. Everest–Makalu–Cho Oyu Massifs (Khumbu and Khumbakarna Himal) Including Informations on Late-glacial, Neoglacial, and Historical Glacier Stages, their Snow-line Depressions and Ages

The Maximum Ice Age (Würmian, Last Ice Age, LGM) Glaciation of the Himalaya – A... In the Khumbu- and Khumbakarna Himalaya an ice stream network and valley glacier system has been reconstructed for the last glacial period (Würmian, Last Ice Age, Isotope stage 4–2, 60–18 Ka BP, Stage 0) with glaciogeomorphological and sedimentological methods. It was a part of the glacier system of the Himalaya and has communicated across transfluence passes with the neighbouring ice stream networks toward the W and E. The ice stream network has also received inflow from the N, from a Tibetan ice stream network, by the Kyetrak–Nangpa–Bote Koshi Drangka in the W, by the W-Rongbuk glacier valley into the Ngozumpa Drangka, by the Central Rongbuk glacier valley into the Khumbu Drangka and by the antecedent Arun Nadi transverse-valley in the E of the investigation area. The ice thickness of the valley glacier sections, the surface of which was situated above the snow-line, amounted to 1000–1450 m. The most extended parent valley glaciers have measured approx. 70 km in length (Dudh Koshi glacier), 67 km (Barun–Arun glacier) and 80 km (Arun glacier). The tongue end of the Arun glacier has flowed down to ca. 500 m and that of the Dudh Koshi glacier to ca. 900 m a.s.l. At heights of the catchment areas of 8481 (or 8475) m (Makalu), i.e. 8848 (or 8872) m (Mt. Everest, Sagarmatha, Chogolungma) this is a vertical distance of the Ice Age glaciation of ca. 8000 m. The steep faces towering up to 2000 m above the névé areas of the 6000–7000 m-high surfaces of the ice stream network were located 2000–5000 m above the ELA. Accordingly, their temperatures were so low, that their rock surfaces were free of flank ice and ice balconies. From the maximum past glacier extension up to the current glacier margins, 13 (altogether 14) glacier stages have been differentiated and in part 14C-dated. They were four glacier stages of the late-glacial period, three of the neoglacial period and six of the historical period. By means of 130 medium-sized valley glaciers the corresponding ELA-depressions have been calculated in comparison with the current courses of the orographic snow-line. The number of the glacier stages since the maximum glaciation approx. agrees with that e.g. in the Alps and the Rocky Mountains since the last glacial period. Accordingly, it is interpreted as an indication of the Würmian age (last glacial period) of the lowest ice margin positions. The current climatic, i.e. average glacier snow-line in the research area runs about 5500 m a.s.l. The snow-line depression (ELA) of the last glacial period (Würm) calculated by four methods has run about 3870 m a.s.l., so that an ELA-depression of ca. 1630 m has been determined. This corresponds to a lowering of the annual temperature by ca. 8, i.e. 10 °C according to the specific humid conditions at that time. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png GeoJournal Springer Journals

The Maximum Ice Age (Würmian, Last Ice Age, LGM) Glaciation of the Himalaya – A Glaciogeomorphological Investigation of Glacier Trim-lines, Ice Thicknesses and Lowest Former Ice Margin Positions in the Mt. Everest–Makalu–Cho Oyu Massifs (Khumbu and Khumbakarna Himal) Including Informations on Late-glacial, Neoglacial, and Historical Glacier Stages, their Snow-line Depressions and Ages

GeoJournal , Volume 62 (4) – Aug 22, 2005

The Maximum Ice Age (Würmian, Last Ice Age, LGM) Glaciation of the Himalaya – A Glaciogeomorphological Investigation of Glacier Trim-lines, Ice Thicknesses and Lowest Former Ice Margin Positions in the Mt. Everest–Makalu–Cho Oyu Massifs (Khumbu and Khumbakarna Himal) Including Informations on Late-glacial, Neoglacial, and Historical Glacier Stages, their Snow-line Depressions and Ages

In the Khumbu- and Khumbakarna Himalaya an ice stream network and valley glacier system has been recon- structed for the last glacial period (Wu¨ rmian, Last Ice Age, Isotope stage 4–2, 60–18 Ka BP, Stage 0) with gla- ciogeomorphological and sedimentological methods. It was a part of the glacier system of the Himalaya and has communicated across transfluence passes with the neighbouring ice stream networks toward the W and E. The ice stream network has also received inflow from the N, from a Tibetan ice stream network, by the Kyetrak–Nangpa– Bote Koshi Drangka in the W, by the W-Rongbuk glacier valley into the Ngozumpa Drangka, by the Central Rongbuk glacier valley into the Khumbu Drangka and by the antecedent Arun Nadi transverse-valley in the E of the investigation area. The ice thickness of the valley glacier sections, the surface of which was situated above the snow- line, amounted to 1000–1450 m. The most extended parent valley glaciers have measured approx. 70 km in length (Dudh Koshi glacier), 67 km (Barun–Arun glacier) and 80 km (Arun glacier). The tongue end of the Arun glacier has flowed down to ca. 500 m and that of the Dudh Koshi glacier to ca. 900 m a.s.l. At heights of the catchment areas of 8481 (or 8475) m (Makalu), i.e. 8848 (or 8872) m (Mt. Everest, Sagarmatha, Chogolungma) this is a vertical distance of the Ice Age glaciation of ca. 8000 m. The steep faces towering up to 2000 m above the ne´ ve´ areas of the 6000–7000 m-high surfaces of the ice stream network were located 2000–5000 m above the ELA. Accordingly, their temperatures were so low, that their rock surfaces were free of flank ice and ice balconies. From the maximum past glacier extension up to the current glacier margins, 13 (altogether 14) glacier stages have been differentiated and in part 14C-dated. They were four glacier stages of the late-glacial period, three of the neoglacial period and six of the historical...
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Publisher
Springer Netherlands
Copyright
Copyright © 2006 by Springer
Subject
Social Sciences, general; Human Geography; Geography (general); Environmental Management
ISSN
0343-2521
eISSN
1572-9893
D.O.I.
10.1007/s10708-005-2338-6
Publisher site
See Article on Publisher Site

Abstract

In the Khumbu- and Khumbakarna Himalaya an ice stream network and valley glacier system has been reconstructed for the last glacial period (Würmian, Last Ice Age, Isotope stage 4–2, 60–18 Ka BP, Stage 0) with glaciogeomorphological and sedimentological methods. It was a part of the glacier system of the Himalaya and has communicated across transfluence passes with the neighbouring ice stream networks toward the W and E. The ice stream network has also received inflow from the N, from a Tibetan ice stream network, by the Kyetrak–Nangpa–Bote Koshi Drangka in the W, by the W-Rongbuk glacier valley into the Ngozumpa Drangka, by the Central Rongbuk glacier valley into the Khumbu Drangka and by the antecedent Arun Nadi transverse-valley in the E of the investigation area. The ice thickness of the valley glacier sections, the surface of which was situated above the snow-line, amounted to 1000–1450 m. The most extended parent valley glaciers have measured approx. 70 km in length (Dudh Koshi glacier), 67 km (Barun–Arun glacier) and 80 km (Arun glacier). The tongue end of the Arun glacier has flowed down to ca. 500 m and that of the Dudh Koshi glacier to ca. 900 m a.s.l. At heights of the catchment areas of 8481 (or 8475) m (Makalu), i.e. 8848 (or 8872) m (Mt. Everest, Sagarmatha, Chogolungma) this is a vertical distance of the Ice Age glaciation of ca. 8000 m. The steep faces towering up to 2000 m above the névé areas of the 6000–7000 m-high surfaces of the ice stream network were located 2000–5000 m above the ELA. Accordingly, their temperatures were so low, that their rock surfaces were free of flank ice and ice balconies. From the maximum past glacier extension up to the current glacier margins, 13 (altogether 14) glacier stages have been differentiated and in part 14C-dated. They were four glacier stages of the late-glacial period, three of the neoglacial period and six of the historical period. By means of 130 medium-sized valley glaciers the corresponding ELA-depressions have been calculated in comparison with the current courses of the orographic snow-line. The number of the glacier stages since the maximum glaciation approx. agrees with that e.g. in the Alps and the Rocky Mountains since the last glacial period. Accordingly, it is interpreted as an indication of the Würmian age (last glacial period) of the lowest ice margin positions. The current climatic, i.e. average glacier snow-line in the research area runs about 5500 m a.s.l. The snow-line depression (ELA) of the last glacial period (Würm) calculated by four methods has run about 3870 m a.s.l., so that an ELA-depression of ca. 1630 m has been determined. This corresponds to a lowering of the annual temperature by ca. 8, i.e. 10 °C according to the specific humid conditions at that time.

Journal

GeoJournalSpringer Journals

Published: Aug 22, 2005

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