Lithological-magneto-palynological characteristics of the Upper Miocene, Pliocene and Gelasian deposits of the Cenozoic reference section of the Dnieper-Donetsk depression (Ukraine)

IF 0.4 Q4 GEOSCIENCES, MULTIDISCIPLINARY
O. Sirenko
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引用次数: 0

Abstract

Well 11 is located near the village of Velika Lanna, Krasnograd District, Kharkiv Region, and at the current stage of research is the most representative section of the continental Upper Cenozoic deposits of the Dnieper-Donets depression. For the first time, a comprehensive description of the Upper Miocene, Pliocene, and Pleistocene deposits obtained from the results of paleopedological, palynological, and paleomagnetic studies is presented for the research region. Characteristic features of 13 climatolites (pedocomplexes and intersoil clays) including five upper Miocene, three lower Pliocene, two upper Pliocene and two climatolites correlated with the Gelasian of the International Stratigraphic Scale were determined. According to the results of miner- alogical studies, three mineralogical strata such as montmorillonite-kaolinite, hydromica-montmorillonite, and hydromica were traced for the deposits of the section. The mineralogical boundaries are confined to the levels of the Salgir–Liubimivka and Siversk–Beregove climatoliths. The spore-pollen complexes of all studied deposits are described. It was established that the complexes characterizing each studied climatolith differ in taxonomic composition, the ratio of the pollen of the main groups of plants, and the presence of characteristic taxa. Changes in the composition of spore-pollen spectra characterizing all soils of pedocomplexes as well as intersoil clays and embryonic soils formed during short-term warming at the time of the cool stages of the Miocene, Pliocene, and Gelasian periods were traced. The described spore-pollen complexes and spectra were compared with those from the deposits of the same age in adjacent regions, which allowed identifying the general and regional features of the compared complexes. A detailed record of changes in the geomagnetic field during the formation of the Upper Miocene-Pleistocene deposits was obtained, which enables to construct a paleomagnetic section reflecting the areas with normal, reverse and anomalous polarity. According to the nature of distribution of such areas, the section is tied to the Cox scale. All these materials allowed carrying out the stratigraphic dissection of the Miocene-Gelasian deposits of the studied section, as well as to substantiate the feasibility of defining it as a reference for the Miocene-Pleistocene deposits of the Dnieper-Donets depression.
乌克兰第聂伯-顿涅茨克凹陷新生代参考剖面上中新世、上新世和Gelasian矿床的岩石-磁-孢粉学特征
11号井位于哈尔科夫州Krasnograd区Velika Lanna村附近,在目前的研究阶段是第聂伯-顿涅茨凹陷上新生代陆相沉积最具代表性的剖面。本文首次对研究区内的上中新世、上新世和更新世沉积进行了全面的描述,这些沉积是根据古岩石学、孢粉学和古地磁研究结果得出的。确定了上中新世5个、下上新世3个、上上新世2个和与国际地层尺度的格拉斯相对应的13个气候石(土壤复体和土壤间粘土)的特征特征。根据矿物学研究结果,确定了该段的矿床为蒙脱石—高岭石、水云母—蒙脱石、水云母3个矿物学层。矿物学界线局限于salgir - liubiivka和Siversk-Beregove气候岩的水平。描述了所有研究矿床的孢子-花粉复合体。结果表明,所研究的气候岩复合体在分类组成、主要植物类群花粉比例和特征分类群的存在等方面存在差异。研究了中新世、上新世和格雷斯世冷期短期变暖过程中形成的土壤、土壤间粘土和胚胎土的孢粉谱变化。将所描述的孢粉复合体和光谱与邻近地区同年龄矿床的孢粉复合体和光谱进行了比较,从而确定了比较复合体的一般特征和区域特征。详细记录了上中新世—更新世矿床形成过程中地磁场的变化,建立了反映正极性、反极性和异常极性区域的古地磁剖面。根据这类地区的分布性质,将剖面与考克斯比例尺联系起来。所有这些资料都有助于对所研究剖面中新世-盖拉世沉积物进行地层解剖,并证实将其定义为第聂伯尔-顿涅茨凹陷中新世-更新世沉积物的参考的可行性。
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来源期刊
Journal of Geology Geography and Geoecology
Journal of Geology Geography and Geoecology GEOSCIENCES, MULTIDISCIPLINARY-
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40.00%
发文量
57
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