证明哈什戈尔特村(西伯利亚西北部)附近鄂毕河下游第四纪中、晚期有脊椎动物复合体的泥沙的年龄

IF 1 4区 地球科学 Q3 GEOLOGY Stratigraphy and Geological Correlation Pub Date : 2024-04-01 DOI:10.1134/s0869593824020072
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引用次数: 0

摘要

摘 要 半个多世纪以来,在哈什戈尔特村附近的鄂毕河下游,中更新世二叠纪岩层上覆盖着位置相近的河沙序列,其中含有不同进化水平的微小哺乳动物群,但这一问题一直悬而未决:第四纪晚期(距离鄂毕河河口 430 公里)和第四纪中期(距离鄂毕河河口 442 (440) 公里)。这与普遍接受的观点相矛盾,根据普遍接受的观点,该地区不存在中第四纪冲积层,这就对西西伯利亚北部更新世历史的地质学或古生物学解释提出了质疑。本文介绍了基于地质学和古生物学方法对两个地质剖面进行关联的结果,并对 20 世纪 80 年代和 2016-2022 年收集的与西西伯利亚卡金期和塔佐夫期地层相关的材料提出了最新的生物地层学解释。研究确定,鄂毕河 430 公里处断面的第四纪晚期微小哺乳动物集合仅限于河漫滩上方第二阶地的冲积层,而第 442 公里处的第四纪中期集合(Khashgort 地点、而在第 442 公里处的第四纪中期(喀什戈尔特地点,博尔沙亚-奥布河 440 公里处),小型哺乳动物的遗骸与冰川流沙有关,这些迹象表明,在中第四纪喀什戈尔特含巨砾的砂质砾岩中,小型哺乳动物的遗骸曾被近距离重新沉积。因此,这项研究使半个多世纪以来相互矛盾的地质学和古生物学数据得以协调。
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Justification of the Age of Sands with Middle and Late Quaternary Theriofaunal Complexes in the Lower Ob River near the Village of Khashgort (Northwestern Siberia)

Abstract

For more than half a century, the question remained unresolved why the closely located sequences of fluvial sands overlying Middle Pleistocene diamicton in the lower reaches of the Ob River near the village of Khashgort contain micromammal faunas of different evolutionary levels: Late Quaternary (430 km from the Ob River mouth) and Middle Quaternary (442 (440) km from the Ob River mouth). This was in contradiction with generally accepted ideas, according to which the absence of Middle Quaternary alluvium was assumed in this area and called into question either geological or paleontological interpretations of the Pleistocene history of north of Western Siberia. This paper presents the results of correlating two geological sections based on both geological and paleontological methods and suggests an updated biostratigraphic interpretation of the materials relevant to the Karginian and Tazovian horizons of Western Siberia collected in the 1980s and 2016–2022. It was established that the Late Quaternary assemblage of micromammals from the sections at kilometer 430 of the Ob River is confined to alluvium of the second terrace above the river floodplain, while the Middle Quaternary assemblage at kilometer 442 (the Khashgort locality, kilometer 440 of the Bolshaya Ob River) is associated with fluvioglacial sands showing signs of close redeposition of small mammal remains in the megaclasts contained in Middle Quaternary Khashgort boulder-bearing sandy aleuropelites. Thus, the study makes it possible to harmonize the geological and paleontological data that were in conflict for more than half a century.

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来源期刊
CiteScore
1.80
自引率
30.00%
发文量
22
审稿时长
>12 weeks
期刊介绍: Stratigraphy and Geological Correlation is the only journal that provides comprehensive coverage of the fundamental and applied aspects of stratigraphy and the correlation of geologic events and processes in time and space. Articles are based on the results of multidisciplinary studies and are for researchers, university professors, students, and geologists interested in stratigraphy and the chronological features of the world’s geological record.
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