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首页> 外文期刊>Journal of Asian earth sciences >Timing of the Tsergo Ri landslide, Langtang Himal, determined by fission-track dating of pseudotachylyte
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Timing of the Tsergo Ri landslide, Langtang Himal, determined by fission-track dating of pseudotachylyte

机译:Tsergo Ri滑坡的时间,Langtang Himal,由假速溶裂变径迹测年确定

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摘要

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 Wuerm 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.
机译:裂变径迹定年是在尼泊尔朗塘喜玛拉尔与晚更新世滑坡(Tsergo Ri滑坡)有关的假速溶锆石上进行的。从直径约10厘米的玻璃状和囊状假速溶电解质的注入管中分离出锆石颗粒。最终的年龄51±13 Ka位于Wuerm冰期的两个亚峰之间(70至20 Ka),并且与先前从地貌证据中得出的年龄估计(即25-30 Ka以上)一致。这是滑坡生成的拟速溶物的第一个可靠的同位素年龄,不包括遗传年龄污染的可能性。

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