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Palynostratigraphy and Genesis of the Upper Cretaceous and Cenozoic Deposits in the Southern Part of the Kulunda Depression, Altai Region
Stratigraphy and Geological Correlation ( IF 1 ) Pub Date : 2020-01-27 , DOI: 10.1134/s0869593819060054
N. K. Lebedeva , O. B. Kuz’mina , I. V. Khazina , G. G. Rusanov , L. A. Glinskikh

Abstract

The results of palynological and micropaleontological studies of the Upper Cretaceous–Cenozoic strata penetrated by Boreholes 23 and 19 of the Aleiskaya area (Altai krai) are presented. The obtained data allowed us to substantiate the age of the deposits, make suggestions concerning their depositional environment, and to clarify the subdivision of geological section into formations. Two palynological assemblages were recognized in the Cretaceous part of the Borehole 23 section: the first one characterizes the Len’ki Formation and is dated as Cenomanian–Turonian; the second one is recognized in the Upper Sym Subformation and is dated as Maastrichtian. The Upper Cretaceous sequence is overlain by the terrestrial Ostrovnoe Formation (Paleogene). In Boreholes 19 and 23, this formation contains presumably Late Paleocene–Early Eocene and Middle Eocene spore and pollen spectra, respectively. Palynological data substantiate the Late Miocene age of sedimentary strata in the upper part of the geological section of Borehole 23 and their belonging to the Pavlodar Formation. The structure of the palynological assemblages, the specific features of the macerate, and the absence of foraminifers indicate the continental genesis of the Upper Cretaceous–Paleogene sedimentary deposits in the southern part of the Kulunda Depression in Altai krai.


中文翻译:

阿尔泰地区库伦达De陷南部上白垩统和新生代矿床的古地层学和成因

摘要

给出了被Aleiskaya地区(Altai krai)的23号和19号钻孔穿透的上白垩统-新生代地层的古生物学和微古生物学研究的结果。所获得的数据使我们能够证实矿床的年龄,就其沉积环境提出建议,并阐明地质剖面对地层的细分。在井筒23段的白垩纪地区发现了两种孢粉学组合:第一个是伦基组的特征,其年代为塞诺曼-突尼斯。第二个在上象征派子中得到认可,其日期为马斯特里赫特式。上白垩纪层系被陆生Ostrovnoe形成(古生代)覆盖。在19号和23号钻孔中 该地层可能分别包含晚新世-早始新世和中始新世的孢子和花粉光谱。孢粉学资料证实了23号钻孔地质段上部的中新世晚期沉积时代,并且属于帕夫洛达尔组。孢粉组合的结构,浸渍物的特定特征以及有孔虫的缺失表明阿尔泰克拉伊库伦达da陷南部的上白垩统-古近纪沉积沉积物的大陆成因。
更新日期:2020-01-27
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