阿根廷美索不达米亚晚更新世的季节性干旱热带森林及其与末次冰期环境变化的关系

IF 1.9 3区 地球科学 Q3 GEOGRAPHY, PHYSICAL
L. Fernandez Pacella, J. Baez, A. Crisafulli, M. Roig, M. Di Pasquo, C.A. Luna, I. Fagúndez, M. Martinez, P. Cuaranta
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引用次数: 0

摘要

季节性森林的概念将南美洲热带地区与气候季节性有关的植被结构类型归为一类。因此,这决定了从半落叶到强落叶的植被形态。季节性干旱热带森林(SDTFs)之间最紧密的联系是它们的植物组成,其中豆科和无花果科在木本植物群中占主导地位。阿根廷西北部新近纪的化石记录显示了在中新世-下更新世的不同地点和地层中发现的物种清单,这些物种是通过研究花粉、木材(原木)、角质层、叶印和果实获得的。通过对美索不达米亚地区塔佩比库阿地层、托罗皮/尤波伊地层和埃尔帕尔马地层(上更新世)的沉积物和木质结构进行分析,我们确定了几个花粉类群和硅化木碎片(矿化的)。木质和灌木类群是 SDTF 目前的亲缘特征,由本文描述的 16 个化石物种组成,隶属于 7 个科。在我们的样本中,Anadenanthera colubrina 和 Myracrodruon balansae 是豆科和天南星科中最重要的成员,这两个科在 SDTF 中占主导地位。本研究中描述的古植物物种证实了 SDTF 扩展到了科连特斯省,与该地区更新世期间有利于这些森林发展的各种气候事件(亚热带干旱气候、半沙漠气候和暖湿气候)相吻合。Toropí/Yupoí 和 Tapebicuá 地层的绝对年代证实了它们与海洋同位素阶段 5 的同步性和相关性。通过古植物学分析、Menendoxylon 的存在以及沉积学数据,我们可以推断阿根廷东北部在晚更新世期间存在季节性干燥潮湿的古气候,有利于 SDTF 的发展。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Seasonally dry tropical forests in the late Pleistocene of Mesopotamia, Argentina and their relationship to environmental changes during the Last Interglacial

The concept of seasonal forests groups structural types of vegetation that are related to climatic seasonality in the tropics of South America. Consequently, this determines the physiognomy of the vegetation, from semi-deciduous to strongly deciduous. The strongest link between seasonally dry tropical forests (SDTFs) is their floristic composition, where Leguminosae and Anacardiaceae dominate the woody flora. The fossil records of the Neogene of northwestern Argentina reveal a list of species found in various locations and formations of the Miocene–Lower Pleistocene obtained from studies of pollen, woods (logs), cuticles, impressions of leaves and fruits. The analysis of sediments and woody structures from the Tapebicuá, Toropí/Yupoí and El Palmar Formations (Upper Pleistocene) of the Mesopotamia region allowed us to identify several pollen taxa and silicified wood fragments (mineralized). The woody and shrubby association whose current relatives characterize the SDTF is composed of the 16 fossil species described here belonging to seven families. In our samples, Anadenanthera colubrina and Myracrodruon balansae are the most significant members of the families Leguminosae and Anacardiaceae, which are dominant in the SDTF. The paleobotanical species described in this study confirm the extension of the SDTF to the province of Corrientes, coinciding with various climatic events (dry subtropical, semi-desert and warm-humid climate) that would have favored the development of these forests during the Pleistocene in this region. The absolute dates obtained for the Toropí/Yupoí and Tapebicuá Formations confirm their synchronicity and correlation to Marine Isotope Stage 5. The palynological analysis, the presence of Menendoxylon and the sedimentological data allow us to infer the existence of a seasonally dry humid paleoclimate in northeastern Argentina during the Late Pleistocene favorable to the development of the SDTF.

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来源期刊
Journal of Quaternary Science
Journal of Quaternary Science 地学-地球科学综合
CiteScore
4.70
自引率
8.70%
发文量
82
审稿时长
6-12 weeks
期刊介绍: The Journal of Quaternary Science publishes original papers on any field of Quaternary research, and aims to promote a wider appreciation and deeper understanding of the earth''s history during the last 2.58 million years. Papers from a wide range of disciplines appear in JQS including, for example, Archaeology, Botany, Climatology, Geochemistry, Geochronology, Geology, Geomorphology, Geophysics, Glaciology, Limnology, Oceanography, Palaeoceanography, Palaeoclimatology, Palaeoecology, Palaeontology, Soil Science and Zoology. The journal particularly welcomes papers reporting the results of interdisciplinary or multidisciplinary research which are of wide international interest to Quaternary scientists. Short communications and correspondence relating to views and information contained in JQS may also be considered for publication.
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