Timing of the Tsergo Ri landslide, Langtang Himal, determined by fission-track dating of pseudotachylyte

Fission-track dating was carried out on zircon grains from pseudotachylyte associated with a Late Pleistocene landslide (Tsergo Ri landslide) in Langtang Himal, Nepal. Zircon grains were separated from an injection pipe of glassy and vesicular pseudotachylyte about 10 cm in diameter. The resulting a...

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Bibliographic Details
Published inJournal of Asian earth sciences Vol. 29; no. 2; pp. 466 - 472
Main Authors Takagi, Hideo, Arita, Kazunori, Danhara, Tohru, Iwano, Hideki
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.02.2007
Subjects
Fission track dating
Langtang Himal
Pseudotachylyte
Tsergo Ri landslide
Tsergo Ri landslide
Langtang Himal
Pseudotachylyte
Fission track dating
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Summary:Fission-track dating was carried out on zircon grains from pseudotachylyte associated with a Late Pleistocene landslide (Tsergo Ri landslide) in Langtang Himal, Nepal. Zircon grains were separated from an injection pipe of glassy and vesicular pseudotachylyte about 10 cm in diameter. The resulting age of 51±13 Ka lies between the two subpeaks (70 and 20 Ka) of the Würm glacial period, and is concordant with the previous age estimate from geomorphological evidence (i.e. older than 25–30 Ka). This is the first reliable isotopic age for a landslide-generated pseudotachylyte excluding the possibility of contamination by an inherited age.
ISSN:1367-9120
1878-5786
DOI:10.1016/j.jseaes.2005.12.002