挪威南部Jotunheimen的雪崩巨石扇:施密特锤暴露年代测定,地貌学,动力学和进化

IF 1.4 4区 地球科学 Q3 GEOGRAPHY, PHYSICAL Geografiska Annaler Series A-Physical Geography Pub Date : 2020-04-02 DOI:10.1080/04353676.2020.1762365
J. Matthews, S. Haselberger, Jennifer L. Hill, G. Owen, S. Winkler, J. Hiemstra, Helen Hallang
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引用次数: 2

摘要

利用施密特-锤暴露年龄测定法(SHD)和地衣测定法,研究了来自日本约顿黑门两个高高山遗址的11个雪崩巨石扇的年代。地表巨石的平均暴露年龄在2285±725年至7445±1020年之间,表明了SHD在确定活动地貌和历时地表年龄方面的潜力。基于gis的形态计量学分析表明,其中10个扇内的岩石材料体积占其各自基岩溜槽和运输带总体积的16-68%。推断扇体完全沉积于全新世,主要是在全新世早期至中期,由频繁的雪崩带着很小的碎屑负荷沉积而成。相对较小的运输带体积与低侵蚀力的雪崩相一致。多余的斜槽体积似乎代表了新仙女木期和可能更早的陆上侵蚀。扇扇的碎屑供应可能是由脱冰后的早全新世副冰川过程以及与中全新世热极大期相关的后来的永久冻土退化所增强的。后者,连同其中一个扇的最年轻SHD年龄,可能预示着地貌活动的类似增加,以响应当前的变暖趋势。
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Snow-avalanche boulder fans in Jotunheimen, southern Norway: Schmidt-hammer exposure-age dating, geomorphometrics, dynamics and evolution
ABSTRACT Eleven snow-avalanche boulder fans were dated from two high-alpine sites in Jotunheimen using Schmidt-hammer exposure-age dating (SHD) and lichenometry. Average exposure ages of the surface boulders ranged from 2285 ± 725 to 7445 ± 1020 years and demonstrate the potential of SHD for dating active landforms and diachronous surfaces. Application of GIS-based morphometric analyses showed that the volume of rock material within 10 of the fans is accounted for by 16–68% of the combined volume of their respective bedrock chutes and transport zones. It is inferred that the fans were deposited entirely within the Holocene, mainly within the early- to mid Holocene, by frequent avalanches carrying very small debris loads. Relatively small transport-zone volumes are consistent with avalanches of low erosivity. Excess chute volumes appear to represent subaerial erosion in the Younger Dryas and possibly earlier. Debris supply to the fans was likely enhanced by early-Holocene paraglacial processes following deglaciation, and by later permafrost degradation associated with the mid-Holocene Thermal Maximum. The latter, together with the youngest SHD age from one of the fans, may presage a similar increase in geomorphic activity in response to current warming trends.
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来源期刊
CiteScore
3.60
自引率
0.00%
发文量
12
审稿时长
>12 weeks
期刊介绍: Geografiska Annaler: Series A, Physical Geography publishes original research in the field of Physical Geography with special emphasis on cold regions/high latitude, high altitude processes, landforms and environmental change, past, present and future. The journal primarily promotes dissemination of regular research by publishing research-based articles. The journal also publishes thematic issues where collections of articles around a specific themes are gathered. Such themes are determined by the Editors upon request. Finally the journal wishes to promote knowledge and understanding of topics in Physical Geography, their origin, development and current standing through invited review articles.
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