Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/324685
Type: Artigo
Title: Micromorphology Of Paleosols Of The Marília Formation And Their Significance In The Paleoenvironmental Evolution Of The Bauru Basin, Upper Cretaceous, Southeastern Brazil
Author: Silva
Márcio Luiz da; Batezelli
Alessandro; Ladeira
Francisco Sérgio Bernardes
Abstract: Deduction of associated paleoenvironments and paleoclimate, definition of the chronosequence of paleosols, and paleogeographic reconstruction have become possible through the application of micromorphology in paleopedology. Micromorphology has also been useful in recognition of weathering processes and definition of minerals formed in succession. In this respect, the objective of this study was to identify the development of pedogenic processes and discuss their significance in the paleoclimate evolution of the Marília Formation (Maastrichtian) of Bauru Basin. Three sections of the Marília Formation (A1, A2, and A3) were described, comprising nine profiles. Micromorphologic al analysis was carried out according to the specialized literature. In the Marília Formation, the paleosols developed in sandstones have argillic (Btkm, Bt) and carbonate (Bk) horizons with different degrees of cementation, forming mainly calcretes. The evolution of pedogenic processes, in light of micromorphological analysis, evidenced three moments or stages for the genesis of paleosols with Bkm, Btk, and Bt horizons, respectively. In the Maastrichtian in the Bauru Basin, the paleosols with Bkm are older and more arid environments, and those with Bt were formed in wetter weather, but not enough to lead to the genesis of enaulic-related distributions, typical of current Oxisols.
Subject: Calcrete
C/f-related Distribution
B-fabric
Pedofeatures
Paleoclimate
Editor: Sociedade Brasileira de Ciência do Solo
Rights: aberto
Address: http://www.scielo.br/scielo.php?pid=S0100-06832017000100304&script=sci_arttext
Date Issue: 2017
Appears in Collections:Unicamp - Artigos e Outros Documentos

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