Julian Alps的Most na so i (so a Valley)附近Modrejce沉积环境的晚第四纪演化

Q3 Earth and Planetary Sciences Geologija Pub Date : 2020-12-07 DOI:10.5474/geologija.2020.022
P. Rupnik, M. Žebre, G. Monegato
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引用次数: 4

摘要

地貌和地质测绘长期以来一直用于研究斯洛文尼亚阿尔卑斯山的冰川历史,但关于更新世冰川的时间和范围仍然存在许多不确定性。冰川地貌和未受干扰的冰川沉积物在前冰川终点地区非常罕见,特别是在so a山谷,在那里对前so a冰川范围的解释存在很大差异。早期的研究证明,一个或两个冰期是否延伸到索 a谷,一直延伸到Most na soi。为了回答这一问题,本文研究了莫德雷杰斯河谷第四纪的沉积演替和地貌特征。新的地质和地貌野外资料可以解释沉积环境和不同单元之间的地层关系。在冰川动力学的作用下,沉积由冰河期和冰湖期发展到完全冰期环境,然后是斜坡沉积。在海拔较高的地方,侧冰碛被保存了下来,而下面的阶梯状斜坡则被冰川和冰川后的过程(包括河流侵蚀和斜坡动力学)雕刻成更古老的冰川、冰川河流和冰川湖泊沉积物。我们得出结论,这里研究的演替是在两个不同的冰川推进过程中沉积的-LGM和前LGM。因此,我们的研究表明,在晚第四纪期间,so a冰川延伸到Most na so i地区两次。
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Late Quaternary evolution of the sedimentary environment in Modrejce near Most na Soči (Soča Valley, Julian Alps)
Geomorphological and geological mapping have long been used to study the glacial history of the Slovenian Alps, but many uncertainties remain regarding the time and extent of Pleistocene glaciations there. Glacial landforms and undisturbed glacial deposits are rare in the areas of the former glacier terminus, especially in the Soča Valley, where large discrepancies in the interpretation of the extent of the former Soča Glacier have been reported. Early studies proved inconclusive as to whether one or two glaciations extended into the Soča Valley as far as Most na Soči. In order to answer this question, the Quaternary sedimentary succession and landforms in the Modrejce Valley near Most na Soči were investigated. New geological and geomorphological field data allow the interpretation of the sedimentary environment and the stratigraphic relationships between different units. In response to glacial dynamics, the sedimentation developed from glaciofluvial and glaciolacustrine to fully glacial environments, followed by slope deposition. At higher altitudes lateral moraines are preserved, while the staircase-like slope below has been carved into older glacial, glaciofluvial and glaciolacustrine deposits by glacial and post-glacial processes, including fluvial erosion and slope dynamics. We conclude that the succession studied here was deposited over the course of two different glacial advances – LGM and pre-LGM. Our study thus suggests that the Soča Glacier extended as far as the area of Most na Soči twice over the course of the late Quaternary.
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来源期刊
Geologija
Geologija Earth and Planetary Sciences-Geophysics
CiteScore
1.00
自引率
0.00%
发文量
10
审稿时长
10 weeks
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