Arid
DOI10.1016/j.jsames.2014.11.007
Evolution and palaeoenvironment of the Bauru Basin (Upper Cretaceous, Brazil)
Fernandes, Luiz Alberto1; Magalhaes Ribeiro, Claudia Maria2
通讯作者Fernandes, Luiz Alberto
来源期刊JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
ISSN0895-9811
出版年2015
卷号61页码:71-90
英文摘要

The Bauru Basin was one of the great Cretaceous desert basins of the world, evolved in arid zone called Southern Hot Arid Belt. Its paleobiological record consists mainly of dinosaurs, crocodiles and turtles. The Bauru Basin is an extensive region of the South American continent that includes parts of the southeast and south of Brazil, covering an area of 370,000 km(2). It is an interior continental basin that developed as a result of subsidence of the central-southern part of the South-American Platform during the Late Cretaceous (Coniacian-Maastrichtian). This sag basin is filled by a sandy siliciclastic sequence with a preserved maximum thickness of 480 m, deposited in semiarid to desert conditions. Its basement consists of volcanic rocks (mainly basalts) of the Lower Cretaceous (Hauterivian) Serra Geral basalt flows, of the Parana-Etendeka Continental Flood Basalt Province. The sag basin was filled by an essentially siliciclastic psammitic sequence. In lithostratigraphic terms the sequence consists of the Caiua and Bauru groups. The northern and northeastern edges of the basin provide a record of more proximal original deposits, such as associations of conglomeratic sand facies from alluvial fans, lakes, and intertwined distributary river systems. The progressive basin filling led to the burial of the basaltic substrate by extensive blanket sand sheets, associated with deposits of small dunes and small shallow lakes that retained mud (such as loess). Also in this intermediate context between the edges (more humid) and the interior (dry), wide sand sheet areas crossed by unconfined desert rivers (wadis) occurred. In the central axis of the elliptical basin a regional drainage system formed, flowing from northeast to southwest between the edges of the basin and the hot and dry inner periphery of the Caiua desert (southwest). Life in the Bauru Basin flourished most in the areas with the greatest water availability, in which dinosaurs, crocodiles, turtles, fish, amphibians, molluscs, crustaceans, and charophyte algae lived. The fossil record mainly consists of transported bones and other skeletal fragments. In the northeastern and eastern marginal regions fossils are found in marginal alluvial fan deposits, broad plains of braided streams and ephemeral alkaline water lakes. In the basin interior the fossil record is related to deposits in sand sheets with braided streams, small dunes, and shallow lakes. In the great Caiua inner desert a few smaller animals could survive (small reptiles and early mammals), sometimes leaving their footprints in dune foreset deposits. The aim of this article is to present and link the basin sedimentary evolution, palaeoecological features and palaeontological record. (C) 2014 Elsevier Ltd. All rights reserved.


英文关键词Sag basin Biostratigraphy Dinosaur Vertebrate Taphonomy
类型Article ; Proceedings Paper
语种英语
国家Brazil
收录类别SCI-E ; CPCI-S
WOS记录号WOS:000356556900007
WOS关键词KALAHARI ; ORIGINS ; AFRICA ; SYSTEM
WOS类目Geosciences, Multidisciplinary
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/2XILL650/188959
作者单位1.Univ Fed Parana, Setor Ciencias Terra, Dept Geol, BR-80060000 Curitiba, Parana, Brazil;
2.Univ Fed Rural Rio de Janeiro, Dept Geociencias IA, Rio De Janeiro, Brazil
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Fernandes, Luiz Alberto,Magalhaes Ribeiro, Claudia Maria. Evolution and palaeoenvironment of the Bauru Basin (Upper Cretaceous, Brazil)[J],2015,61:71-90.
APA Fernandes, Luiz Alberto,&Magalhaes Ribeiro, Claudia Maria.(2015).Evolution and palaeoenvironment of the Bauru Basin (Upper Cretaceous, Brazil).JOURNAL OF SOUTH AMERICAN EARTH SCIENCES,61,71-90.
MLA Fernandes, Luiz Alberto,et al."Evolution and palaeoenvironment of the Bauru Basin (Upper Cretaceous, Brazil)".JOURNAL OF SOUTH AMERICAN EARTH SCIENCES 61(2015):71-90.
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