The onset of Pliocene–Early Pleistocene fluvial aggradation in the Southeastern Alpine Foreland (Velenje Basin, Slovenia) and its paleoenvironmental implications

IF 1.9 3区 地球科学 Q3 GEOGRAPHY, PHYSICAL
Eva Mencin Gale, Petra Jamšek Rupnik, Naki Akçar, Marcus Christl, Christof Vockenhuber, Flavio S. Anselmetti, Andrej Šmuc
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Abstract

In this study, we focused on the Pliocene–Early Pleistocene fluvial terraces in the Velenje Basin and reconstructed the morphostratigraphy, sedimentary depositional environment, provenance and age of the gravel deposits using geomorphological, sedimentological, petrographic and chronological analyses. Geomorphological mapping revealed the presence of two main river-terrace groups. The terraces in the older terrace group are severely degraded and preserved only as remnants capping high ground, while in contrast the younger group is better preserved. Detailed lithofacies analyses of four selected stratigraphic sections of the older terrace group show that the gravel was deposited in a meandering and wandering environment. The gravel consists of metamorphic, igneous, volcaniclastic, clastic and carbonate lithologies derived from the north, east and west from the Paka River catchments. To determine the timing of deposition, we performed isochron-burial dating using cosmogenic 26Al and 10Be. Our new age constraints date the deposition of the older terrace group to 2.7 ± 0.3 Ma. Establishing the aggradation and incision model of the Velenje Basin documents pronounced regional tectonic uplift during the Pliocene–Early Pleistocene, which led to incision and the subsequent formation of a terrace staircase.

Abstract Image

东南阿尔卑斯山前陆(斯洛文尼亚维伦耶盆地)上新世-早更新世河道侵蚀的开始及其对古环境的影响
在这项研究中,我们重点研究了 Velenje 盆地的上新世-早更新世河流阶地,并通过地貌学、沉积学、岩石学和年代学分析,重建了砾石沉积的形态地层学、沉积环境、来源和年龄。地貌测绘显示存在两大河流阶地群。较早的阶地组中的阶地退化严重,仅作为覆盖高地的遗迹保存下来,相比之下,较晚的阶地组则保存较好。对老阶梯组的四个选定地层剖面进行的详细岩石成分分析表明,这些砾石是在蜿蜒徘徊的环境中沉积下来的。砾石由变质岩、火成岩、火山碎屑岩、碎屑岩和碳酸盐岩组成,分别来自帕卡河集水区的北部、东部和西部。为了确定沉积时间,我们使用宇宙成因 26Al 和 10Be 进行了等时埋藏年代测定。根据新的年龄限制,较早的阶地群的沉积时间为 2.7 ± 0.3 Ma。建立维伦耶盆地的侵蚀和增生模型记录了上新世-早更新世期间明显的区域构造隆起,这导致了侵蚀和随后形成的阶梯状阶地。
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来源期刊
Journal of Quaternary Science
Journal of Quaternary Science 地学-地球科学综合
CiteScore
4.70
自引率
8.70%
发文量
82
审稿时长
6-12 weeks
期刊介绍: The Journal of Quaternary Science publishes original papers on any field of Quaternary research, and aims to promote a wider appreciation and deeper understanding of the earth''s history during the last 2.58 million years. Papers from a wide range of disciplines appear in JQS including, for example, Archaeology, Botany, Climatology, Geochemistry, Geochronology, Geology, Geomorphology, Geophysics, Glaciology, Limnology, Oceanography, Palaeoceanography, Palaeoclimatology, Palaeoecology, Palaeontology, Soil Science and Zoology. The journal particularly welcomes papers reporting the results of interdisciplinary or multidisciplinary research which are of wide international interest to Quaternary scientists. Short communications and correspondence relating to views and information contained in JQS may also be considered for publication.
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