globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.05.014
Scopus记录号: 2-s2.0-85020728314
论文题名:
Geomorphology and age of the Marocche di Dro rock avalanches (Trentino, Italy)
作者: Ivy-Ochs S.; Martin S.; Campedel P.; Hippe K.; Alfimov V.; Vockenhuber C.; Andreotti E.; Carugati G.; Pasqual D.; Rigo M.; Viganò A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 169
起始页码: 188
结束页码: 205
语种: 英语
英文关键词: Alps ; Cosmogenic 36Cl exposure dating ; Holocene ; Landslide ; Rock slope failure ; Sarca River Valley
Scopus关键词: Deposits ; Earthquakes ; Geomorphology ; Geophysics ; Landslides ; Rocks ; Alps ; Cosmogenic ; Holocenes ; River valley ; Rock slope failure ; Landforms ; age determination ; boulder ; chlorine isotope ; collapse ; cosmogenic radionuclide ; debris avalanche ; geomorphological mapping ; Holocene ; landslide ; limestone ; relief ; rock avalanche ; slope failure ; tectonic setting ; volume ; Alps ; Italy ; Trentino-Alto Adige ; Trento
英文摘要: The Marocche di Dro deposits in the lower Sarca Valley are some of the most distinctive rock avalanche deposits of the Alps. We use geomorphology and cosmogenic 36Cl exposure dating of boulders to divide the Marocche di Dro deposits into two rock avalanche bodies; the Marocca Principale to the north and the Kas to the south. The deposits were previously undated and had been mapped as up to five different events. The largest event Marocca Principale, which comprises an estimated 1000 106 m3 of predominantly Rotzo Formation limestones, occurred 5300 ± 860 yr ago. The release area is located mainly in the alcove between Mt. Casale and Mt. Granzoline, but likely extends all the way to Mt. Brento. The Kas event took place 1080 ± 160 yr ago with detachment below Mt. Brento. The Kas debris, with an estimated volume of 300 106 m3, buried the southern third of the Marocca Principale deposit. Kas presents a barren, stark landscape dominated by house-sized Tovel Member Rotzo Formation boulders bearing distinctive chert lenses. Both the extreme relief of the rock wall (more than 1300 m) and the tectonic setting predispose the range front to massive failure. For the two events, initially translational movement likely quickly evolved into complex failure and massive collapse. Run-out across the valley of several kilometers and run-up on the opposite slope of hundreds of meters followed. A summary of all dated and large historical landslides in the Alps underlines the periods of enhanced slope activity discussed in the literature: 10-9 kyr, 5-3 kyr, and 2-1 kyr, the latter especially for the Southern Alps. No deposits of the first temporal cluster are found at Marocche di Dro. The age of Marocca Principale at 5300 ± 860 yr suggests occurrence during the second period. Failure may have been related to the shift to wetter, colder climate at the transition from the middle to the late Holocene. Nevertheless, a seismic trigger cannot be ruled out. For the Kas rock avalanche at 1080 ± 160 yr ago we implicate the “Middle Adige Valley” (1046 CE) earthquake as trigger. Its epicentral distance is much closer to the Sarca Valley in comparison to that of the Verona earthquake (1117 CE). © 2017 Elsevier Ltd
资助项目: We thank editor X. Yang and two anonymous reviewers for thorough critical review. F. Zorzi is thanked for spectrometric analysis of residua after dissolution of samples. We appreciate N. Michelon's help in drawing several figures. Funding from the Geological Survey of Trento Province and the University of Padova (Progetto di ricerca di Ateneo 2014, CPDA140511) allowed this research. We thank the Geological Survey of Trento Province for access to the DEM. The Laboratory of Ion Beam Physics, ETH Zurich, supported fieldwork, laboratory work, and AMS measurements. We thank all members of Ion Beam Physics for their dedication and their endless interest in geomorphology.
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被引频次[WOS]:41   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59179
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作者单位: Laboratory of Ion Beam Physics, ETH-Honggerberg, Zurich, Switzerland; Dipartimento di Geoscienze, Università di Padova, Padova, Italy; Servizio Geologico della Provincia Autonoma di Trento, Trento, Italy; INFN, Università dell'Insubria, Como, Italy; Dipartimento di Scienza e Alta Tecnologia, Università dell'Insubria, Como, Italy

Recommended Citation:
Ivy-Ochs S.,Martin S.,Campedel P.,et al. Geomorphology and age of the Marocche di Dro rock avalanches (Trentino, Italy)[J]. Quaternary Science Reviews,2017-01-01,169
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