The Beinn Alligin rock avalanche, NW Scotland:: cosmogenic 10Be dating, interpretation and significance

被引：65

作者：

Ballantyne, CK ^{[1
]}

Stone, JO

机构：

[1] Univ St Andrews, Sch Geog & Geosci, St Andrews KY16 9AL, Fife, Scotland

[2] Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA

[3] Univ Washington, Quaternary Res Ctr, Seattle, WA 98195 USA

来源：

HOLOCENE | 2004年 / 14卷 / 03期

关键词：

rock avalanche; cosmogenic isotope dating; Beryllium-10; excess runout; grainflow; paraglacial stress release; Scotland;

D O I：

10.1191/0959683604hl720rr

中图分类号：

P9 [自然地理学];

学科分类号：

0705 ; 070501 ;

摘要：

A tongue of very coarse rockslide debris that extends 1.25 km downvalley below Beinn Alligin in NW Scotland has been variously interpreted as a glacier-cored rock glacier, landslide debris redistributed by glacier ice or in excess-runout landslide. Exposure dating with cosmogenic Be-10 demonstrates that the the debris mass was emplaced at 3950 +/- 320 yr BP, and therefore was not associated with glacier ice. Calculations based on frictional considerations imply that the feature is an excess-runout rock avalanche (sturzstrom) deposit. The morphological characteristics of the deposit appear consistent with movement by grainflow or fragmental flow. Failure is inferred to reflect time-dependent paraglacial stress release and consequent propagation of an internal joint network. but may have been triggered by seismic activity. The late-Holocene age of failure implies persistence of the effects of paraglacial stress release over a time-scale of several millennia.

引用

页码：448 / 453

页数：6

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