Late Triassic climate in southernmost Parana Basin (Brazil): evidence from dendrochronological data

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• 作者：Fabbrin Pires ; Etiene ; Guerra Sommer ; Margot ; Marlon dos Santos Scherer ; Claiton
• 关键词：Fossil wood ; Growth rings ; Late Triassic ; Paraná ; Basin ; Brazil ; Paleoclimatology
• 刊名：Journal of South American Earth Sciences
• 出版年：2005
• 出版时间：January, 2005
• 年：2005
• 卷：18
• 期：2
• 页码：213-221
• 全文大小：327 K

文摘

Dendrochronological methods were used to study a fossil wood assemblage identified as Sommerxylon spiralosus Pires et Guerra-Sommer from outcropping sandstone fluvial sequences (Late Triassic of southernmost Parana Basin, Brazil). The climate signal from fossil woods, supported by sedimentary evidence, indicates a seasonal climate. Analysis of preserved growth rings has yielded information about the peridiodicity of growth related to seasonal cycles. The growth phase in each cycle developed at a slow rate, and the growing period was relatively uniform; in contrast, the periodic phases of growth restriction were not very extensive. These seasonal cycles were interrupted by occasional droughts during the growth season, reflected by the presence of false growth rings. These data match recent global climate patterns from the Late Triassic.