干旱区生态环境知识资源中心(Arid): Facies and palaeosol analysis in a progradational distributive fluvial system from the Campanian-Maastrichtian Bauru Group, Brazil

Arid

DOI	10.1111/sed.12507
	Facies and palaeosol analysis in a progradational distributive fluvial system from the Campanian-Maastrichtian Bauru Group, Brazil
	Batezelli, Alessandro 1; Bernardes Ladeira, Francisco Sergio 2; do Nascimento, Diego Luciano 3; Da Silva, Marcio Luiz 3
通讯作者	Batezelli, Alessandro
来源期刊	SEDIMENTOLOGY
ISSN	0037-0746
EISSN	1365-3091
出版年	2019
卷号	66 期号:2 页码:699-735
英文摘要	The Upper Cretaceous Bauru Group in south-east Brazil consists of alluvial strata whose characteristics and distribution indicate a fluvial system developed in a semi-arid to arid climate. Sections exposed within a 90000km(2) study area in Minas Gerais State (in south-eastern Brazil) were evaluated using facies and palaeosol analysis to formulate depositional and pedogenic models that may account for geomorphic and climate features. From east to west, the study succession records a gradual decrease in grain size, an increase in the width/thickness ratio in channels, a decrease in the lateral and vertical connectivity of channel deposits, and an increase in overbank deposits. The fluvial architecture indicates a braided channel belt, ephemeral ribbon-channels, and an unconfined fluvial facies from east to west in the study area. The lateral and vertical distribution of facies, stratigraphic architecture and palaeocurrent data suggest proximal, medial and distal portions of a progradational distributive fluvial system. The sedimentary dynamics were marked by the building and abandonment of channels related to processes of aggradation, vegetation growth and palaeosol generation. Macromorphological and micromorphological analyses have identified pedological and mineralogical features that indicate an arid to semi-arid climate with a provenance from the north-eastern part of the basin (Alto Paranaiba Uplift). From the proximal to the distal portions of the distributive fluvial system, the palaeosol development is different. In the proximal portion, the palaeosols are absent or poorly developed, allowing a possible general comparison with the present soil order: Inceptisols and Aridisols. In the medial portion of the fluvial system, the palaeosols are well-developed and characterized by Bt, Btk, C and Ck horizons (Alfisols, Aridisols, Inceptisols and Entisols). Poorly drained to well-drained palaeosols from the base to the top in the distal plain (Aridisols and Inceptisols) are associated with geomorphic and hydromorphic changes in the fluvial system due to progradational evolution. The genetic relationship between the fluvial architecture and the palaeosols enhances the understanding that the sedimentation and pedogenesis that occurs in different portions of the distributive fluvial system are related to the tectonic and climatic evolution of the basin.
英文关键词	Distributive fluvial system facies palaeosol distribution sedimentary and pedogenic processes
类型	Article
语种	英语
国家	Brazil
收录类别	SCI-E
WOS记录号	WOS:000461255500013
WOS关键词	CONTINENTAL SEQUENCE STRATIGRAPHY ; NE BRITISH-COLUMBIA ; BIGHORN BASIN ; PALEOENVIRONMENTAL SIGNIFICANCE ; CALCRETE FORMATION ; MORRISON FORMATION ; DUNVEGAN FORMATION ; MARILIA FORMATION ; SOUTHEAST SPAIN ; NATIONAL-PARK
WOS类目	Geology
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/218823
作者单位	1.Univ Estadual Campinas, Geosci Inst, Dept Geol & Nat Resources, DGRN IG UNICAMP, Carlos Gomes St 250, BR-13083855 Campinas, SP, Brazil; 2.Univ Estadual Campinas, DGRN IG UNICAMP, Geosci Inst, Dept Geog, Carlos Gomes St 250, BR-13083855 Campinas, SP, Brazil; 3.Univ Estadual Campinas, DGRN IG UNICAMP, Geosci Inst, Geosci Postgrad Program, Carlos Gomes St 250, BR-13083855 Campinas, SP, Brazil
推荐引用方式 GB/T 7714	Batezelli, Alessandro,Bernardes Ladeira, Francisco Sergio,do Nascimento, Diego Luciano,et al. Facies and palaeosol analysis in a progradational distributive fluvial system from the Campanian-Maastrichtian Bauru Group, Brazil[J],2019,66(2):699-735.
APA	Batezelli, Alessandro,Bernardes Ladeira, Francisco Sergio,do Nascimento, Diego Luciano,&Da Silva, Marcio Luiz.(2019).Facies and palaeosol analysis in a progradational distributive fluvial system from the Campanian-Maastrichtian Bauru Group, Brazil.SEDIMENTOLOGY,66(2),699-735.
MLA	Batezelli, Alessandro,et al."Facies and palaeosol analysis in a progradational distributive fluvial system from the Campanian-Maastrichtian Bauru Group, Brazil".SEDIMENTOLOGY 66.2(2019):699-735.