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|Title:||Micromorphology Of Paleosols Of The Marilia Formation And Their Significance In The Paleoenvironmental Evolution Of The Bauru Basin, Upper Cretaceous, Southeastern Brazil|
Marcio Luiz; Batezelli
Alessandro; Bernardes Ladeira
|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 Marilia Formation (Maastrichtian) of Bauru Basin. Three sections of the Marilia Formation (A1, A2, and A3) were described, comprising nine profiles. Micromorphologic al analysis was carried out according to the specialized literature. In the Marilia 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.|
|Editor:||Soc Brasileira de Ciencia do Solo|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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