Growth ring analysis of fossil coniferous woods from early cretaceous of Araripe Basin (Brazil)

Anais da Academia Brasileira de Ciências

Etiene F. Pires²  Margot Guerra-sommer¹ 

[1] ,Universidade Federal do TocantinsPorto Nacional TO ,Brasil

关键词: Araripe Basin - Brazil;    dendroclimatology;    pre-rift phase;    fossil woods;    Bacia do Araripe - Brasil;    dendroclimatologia;    fase Pré-Rifte;    lenhos silicificados;   

DOI  :  10.1590/S0001-37652011005000005

来源: SciELO

【 摘 要 】

Growth ring analysis on silicified coniferous woods from the Missão Velha Formation (Araripe Basin - Brazil) has yielded important information about periodicity of wood production during the Early Cretaceous in the equatorial belt. Despite warm temperatures, dendrological data indicate that the climate was characterized by cyclical alternation of dry and rainy periods influenced by cyclical precipitations, typical of tropical wet and dry or savanna climate. The abundance of false growth rings can be attributed to both occasional droughts and arthropod damage. The present climate data agree with palaeoclimatic models that inferred summer-wet biomes for the Late Jurassic/Early Cretaceous boundary in the southern equatorial belt.

【 授权许可】

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