Geomorphological control on the palaeosol evolution in an Upper Cretaceous distributive fluvial system (Bauru Basin, Brazil)

IF 5.4 1区 农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Alessandro Batezelli , Francisco Sergio Bernardes Ladeira , Leidy Alexandra Delgado Blanco , Márcio Luiz da Silva , Taynah Buratto Rebelo
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Abstract

In the last three decades, palaeopedology has been used as a critical methodology for the study of fluvial systems, allowing the identification of specific features related to non-depositional times (such as tectonic, climate, topography, and organisms). The Marília Formation records the distributive fluvial system (DFS) stage of the Bauru Basin (Southeastern Brazil) during the Maastrichtian, dominated by braided river deposits. Based on the relationship between facies and palaeosols, the present work proposes an environmental evolution and estimates the rate of sedimentation and pedogenesis in the Late Cretaceous of Southeast Brazil. By studying bi-dimensional sections, we identified facies associations that compound four main architectural elements: channels (CH), laminated sand sheet (LS), sand bars (SB) and overbank deposits (OF). The sedimentary dynamics were marked by the building and abandoning of channel complexes related to aggradation, carbonate palaeosols generation, clay illuviation, and vegetation growth within the channels. Fifteen palaeosol profiles occur intercalated in the deposits. They are characterised by horizons Bt, Btk, Bss, C, and Ck, which allows a possible general comparison with the present soil orders: Alfisols, Aridisols, Entisols, and Vertisols. The macro- and micromorphological characteristics, combined with the mineralogy of these horizons, indicate arid and semiarid climatic conditions, with the minimum time of profile formation varying from 3740 to 5000 years. The genetic relationship between architectural elements, palaeosols, and the piling pattern suggests that the Marília Formation resulted from a succession of high-frequency depositional events of 103 to 104 years. This approach may allow an understanding of the avulsion and pedogenesis processes in the distal distributive fluvial systems.
上白垩统分流河系古土壤演化的地貌控制(巴西Bauru盆地)
在过去的三十年中,古生物学被用作研究河流系统的关键方法,允许识别与非沉积时代相关的特定特征(如构造,气候,地形和生物)。Marília组记录了Maastrichtian时期Bauru盆地(巴西东南部)的分布河系(DFS)阶段,以辫状河沉积为主。根据相与古土壤的关系,提出了巴西东南部晚白垩世的环境演化,并估计了沉积和成土速率。通过研究二维剖面,我们确定了四种主要建筑元素的相组合:河道(CH)、层状沙层(LS)、沙洲(SB)和河岸沉积(OF)。沉积动力学的标志是河道复合体的建立和废弃,这些复合体与河道内的沉积作用、碳酸盐古土壤的生成、粘土的照明和植被生长有关。15个古土壤剖面穿插在沉积物中。它们以层位Bt、Btk、Bss、C和Ck为特征,这使得可以与目前的土壤阶位进行一般比较:Alfisols、Aridisols、Entisols和versols。这些层位的宏观和微观形态特征,结合矿物学特征,显示了干旱和半干旱的气候条件,剖面形成的最小时间从3740年到5000年不等。建筑元素、古土壤和堆积模式之间的成因关系表明,Marília组是由连续103 ~ 104年的高频沉积事件形成的。这种方法可以帮助我们理解远端分布河流系统的撕裂和成土过程。
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来源期刊
Catena
Catena 环境科学-地球科学综合
CiteScore
10.50
自引率
9.70%
发文量
816
审稿时长
54 days
期刊介绍: Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.
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