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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Paleoenvironmental and paleoclimatic interpretation of the Late Cretaceous Marllia Formation (Brazil) based on paleosol geochemistry
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Paleoenvironmental and paleoclimatic interpretation of the Late Cretaceous Marllia Formation (Brazil) based on paleosol geochemistry

机译：基于古玉米种植体的古环境和古叶沉重地诠释了晚白垩纪玛丽亚形成（巴西）

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摘要

The Late Cretaceous Marilia Formation located in the central-southern portion of Brazil is characterized by a succession of sandstones, conglomerates, and paleosols. The paleosols constitute more than 60% of this formation, providing significant information about pedogenetic processes as well as paleoenvironmental and paleoclimate implications. The paleosols of the Marilia Formation have been studied principally from a strati graphical, sedimentological and paleopedological point of view; however, there are no studies addressing in detail the geochemical behavior of the paleosols. Therefore, we used a robust geochemical dataset combined with stratigraphical and macromorphological interpretations as well as clay mineralogy to conduct a paleoenvironmental and paleoclimate analysis of the Maxilla Formation in the western portion of the state of Minas Gerais in Brazil. The results indicate that the paleosols of the Marina Formation can be divided into three pedotypes and pedochemical units based on their geochemical variations and are limited at the base and top by pedochemical markers. Moreover, X-ray diffraction identified quartz and calcite as primary minerals associated with montmorillonite, smectite, illite and palygorskite, indicating wet periods combined with dry stages associated principally with dry and arid environments. The paleosol distribution and weathering index allow us to interpret the paleoenvironmental evolution of the Late Cretaceous Marflia Formation, suggesting an increase in humidity from east to west in the study area.
机译：位于巴西中部南部的晚餐米兰形成的特点是砂岩，集团和古溶解的特点。古溶胶占该形成的60％以上，提供了有关生物过程的重要信息以及古环境和古古怪的影响。麦丽鱼形成的古玉米醇主要来自Strati图形，沉积学和古学面种的观点来研究;然而，没有关于古醇的地球化学行为的研究。因此，我们使用强大的地球化学数据集结合了地层和大分子理解释以及粘土矿物学，以对巴西Minas Gerais州的西部颌骨形成的麦加拉形成进行古环境和古气候分析。结果表明，根据其地球化学变化，可以将小游艇罩形成的古溶剂分为三个小型物和培养单元，并通过教育学标记的基础和顶部限制。此外，X射线衍射被鉴定为石英和方解石作为与蒙脱石，蒙脱石，伊尔石和腭氏菌属相关的主要矿物质，表明湿时期与主要与干燥和干旱的环境相关的干燥阶段合并。古玉米醇分布和风化指数允许我们解释晚餐玛利亚形成晚期的古环境演变，这表明在研究区向西增加了湿度。

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