The paper presents new data on brackish-water Upper Pliocene and Lower Pleistocene deposits that were studied in the Demirkent (Kars) and Pekecik (Erzurum) sections, NE Turkey. The Demirkent section is situated in the southwestern slope of the Shirak Late Cenozoic intermontane basin near the Turkish-Armenian border. The Pekecik section is situated to the SW of the Demirkent in the southwestern slope of the Horasan intermontane basin. Both sections are composed of clays, silts, and poorly cemented fine-grained sandstones and contain the brackish-water dinocysts of the Akchagylian type. The age of the deposits is determined by combined analysis of associations of molluscs and small mammals, palynological spectra, including dinocysts and algae, and magnetostratigraphic data. The Demirkent and Pekecik sections are dated to the Late Pliocene (Piacenzian). The maximum spread of the Akchagylian transgression influenced the inland areas of NE Turkey prior to the early Gelasian. The pollen spectra demonstrate progressive aridisation during sedimentation of the lower part of the Demirkent section and the wetter and cooler climate during sedimentation of the lower part of the Pekecik section. The analysis of brackish-water dinocysts and fresh-water algae in different beds of the Demirkent section indicates gradual freshening of the basin probably due to the sea level fall. In the Pekecik section, the brackish-water dinocysts are found in the lower part that is covered by the lignite-bearing layers without signs of marine influence. Recent altitudes of the Akchagylian brackish-water deposits give a possibility to estimate magnitudes and average rates of the Quaternary uplift of the western Lesser Caucasus. The elevation of the Upper Pliocene deposits of Demirkent and Pekecik sections shows the uplift rate of ca. 0.6–0.7 mm per year during 2.6 Ma.

本文介绍了在土耳其东北部 Demirkent (Kars) 和 Pekecik (Erzurum) 部分研究的咸水上新世和下更新世矿床的新数据。Demirkent 段位于靠近土耳其-亚美尼亚边界的 Shirak 晚新生代山间盆地的西南斜坡。Pekecik段位于Horasan山间盆地西南斜坡的Demirkent西南。两个部分都由粘土、粉砂和胶结不良的细粒砂岩组成，并包含 Akchagylian 类型的微咸水双胞岩。沉积物的年龄是通过对软体动物和小型哺乳动物的组合、孢粉学光谱（包括双囊藻和藻类）以及磁地层数据的综合分析来确定的。Demirkent 和 Pekecik 剖面可追溯到上新世晚期（皮亚琴基阶）。Akchagylian 海侵的最大传播影响了早期格拉西亚之前土耳其东北部的内陆地区。花粉光谱表明 Demirkent 部分下部的沉积过程中逐渐干旱，而 Pekecik 部分下部的沉积过程中气候较潮湿和凉爽。对 Demirkent 剖面不同床层中的微咸水双胞藻和淡水藻类的分析表明，可能由于海平面下降，盆地逐渐变淡。在 Pekecik 剖面，在被褐煤层覆盖的下部发现了半咸水双胞藻，没有受到海洋影响的迹象。Akchagylian 咸水沉积物的最近海拔高度为估计小高加索西部第四纪隆起的幅度和平均速率提供了可能。Demirkent 和 Pekecik 剖面上上新世矿床的海拔显示了大约 2.6 Ma 期间每年 0.6–0.7 mm。