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Late Eocene to Late Miocene palaeoecological and palaeoenvironmental dynamics of the Ereğli‐Ulukışla Basin (Southern Central Anatolia)
Geological Journal ( IF 1.8 ) Pub Date : 2020-10-26 , DOI: 10.1002/gj.4021
Funda Akgün 1 , Mine Sezgül Kayseri‐Özer 2 , Erdoğan Tekin 3 , Baki Varol 3 , Şevket Şen 4 , Erdal Herece 5 , İbrahim Gündoğan 1 , Koray Sözeri 5 , Muhammed Sami Us 3, 6
Affiliation  

The Ereğli‐Ulukışla Basin which is the focus of this study is situated at the south‐eastern edge of the Central Anatolian Cenozoic basins (Tuzgölü, Haymana, Çankırı‐Çorum, and Sivas), and is divided into two sub‐basins, the Aktoprak (AT) and Hacıbekirli‐Tepeköy (HT). These sub‐basins mainly comprise a stratigraphically discontinuous and laterally variable series, represented by ‘fluvio‐lacustrine’ siliciclastic and carbonate sediments deposited over a wide range of environments, including meandering and braided rivers, coastal fluvial and fan deltas, mixed carbonate‐siliciclastic shores, dry lake flats, and coal‐bearing swamps. In the Ereğli‐Ulukışla Basin, higher palaeotopographic conditions existed in the AT because of the uplift of the Central Anatolian Plateau during late Middle Miocene (Serravallian)‐early Late Miocene (Tortonian) and the subsequent uplift of the Taurus Mountains in the latest Miocene (Messinian) as deduced in the Tepeköy region (northeast) of the HT sub‐basin. Diversity and abundance of archaic pollen (Normapolles) in the pollen biostratigraphy decreased from the Eocene to Oligocene, while forms with advanced angiosperm morphology (post‐Normapolles), were observed with the increase in post‐Normapolles during the Miocene. The dominance of woody angiosperms in the pollen assemblages, and increasing variety and abundance of ‘open herbs’ and shrub pollen from the Early Miocene to Late Miocene defines an important change in flora. Furthermore, the palaeoclimatic conditions changed from humid‐subtropical to warm‐temperate during the sediment deposition in the Ereğli‐Ulukışla Basin. Recurrent arid phases during the Late Miocene are indicated by the deposition of reddish caliche conglomerates in broad dry lake flats (HT), and evaporites in local playa lakes (AT), respectively.

中文翻译:

Ereğli-Ulukışla盆地(安那托利亚中南部)晚始新世至中新世晚期古生态和古环境动力学

作为研究重点的埃雷格里-乌鲁基斯拉盆地位于安纳托利亚中新生代盆地(图兹古勒,海马纳,Çankırı-Çorum和锡瓦斯)的东南边缘,并分为两个亚盆地,阿克托普拉克(AT)和Hacıbekirli‐Tepeköy(HT)。这些子盆地主要包括地层不连续和横向变化的系列,表现为“ fluvio-lacustrine”硅质碎屑和碳酸盐沉积物,沉积在各种环境中,包括蜿蜒和辫状河,沿海河流和扇三角洲,碳酸盐-硅碎屑混合海岸,干燥的湖滩和含煤沼泽。在Ereğli‐Ulukışla盆地,由于中新世中期(塞拉瓦利时期)-中新世晚期(Tortonian)早期中安那托利亚高原的隆升以及随后的中新世(Messinian)中金牛座山脉的隆升(如特佩科伊所推断),AT中存在较高的古地形条件HT子盆地的区域(东北)。从中新世到渐新世,花粉生物地层中的古花粉(Normapolles)的多样性和丰度下降,而在中新世期间,随着Normapolles的增加,观察到具有先进被子植物形态的形态(后Normapolles)。花粉组合中木质被子植物的优势,以及从中新世早期到中新世晚期“开放草药”和灌木花粉的多样性和丰富性,定义了植物区系的重要变化。此外,Ereğli-Ulukışla盆地的沉积物沉积期间,古气候条件从潮湿-亚热带转变为温带。中新世晚期的干旱相分别由宽阔的干lake的湖滩(HT)中的红色钙粉砾岩沉积和局部的滩涂湖(AT)中的蒸发岩沉积指示。
更新日期:2020-10-26
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