Arid
DOI10.1016/j.jsames.2016.07.014
Rare Carboniferous and Permian glacial and non-glacial bryophytes and associated lycophyte megaspores of the Parana Basin, Brazil: A new occurrence and paleoenvironmental considerations
Ricardi-Branco, Fresia1; Rohn, Rosemarie2; Longhim, Marcia Emilia3; Costa, Juliana Sampaio4; Martine, Ariel Milani4; Christiano-de-Souza, Isabel Cortez4
通讯作者Ricardi-Branco, Fresia
来源期刊JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
ISSN0895-9811
出版年2016
卷号72页码:63-75
英文摘要

Fossil bryophytes are rare because their preservation is compromised by the presence of a thin cuticle (if any) and a lack of lignin. Except for the occurrence of one bryophyte in the glacial Dwyka Group of the Karoo Basin, the other rare Late Paleozoic records in Gondwana are notably from the Parana Basin in Southeast/South Brazil. Four bryophyte sites (including a newly discovered one) were found in the lower part of the thick Permo-Carboniferous glacial succession of the Itarare Group, and one was found in the Guadalupian Teresina Formation, which was roughly assigned to an epeiric sea (or "lake") dominated by a warm, semi-arid climate. This study describes the fossils from the new occurrence from the Itarare Group and discusses the context in which the bryophyte beds originated in the basin. The new samples confirm that all of the bryophytes of the Itarare Group can be classified as Dwykea araroii Ricardi-Branco et al. (a possible pleurocarp) and are associated with the lycophyte megaspore Sublagenicula brasiliensis (Dijkstra) Dybova-Jachowicz. In the much younger Teresina Formation, the bryophytes are Yguajemanus yucapirus Cristiano-de-Souza et al. and Capimirinus riopretensis Cristiano-de-Souza et al., and abundant charophytes and rare dwarf lycophyte stems and bracts are present in the same layers. Although the two stratigraphic units represent distinct paleoenvironments and climates, they seem to share some characteristics: a) the bryophyte assemblages were transported very little; b) they were deposited in very calm environments; c) they were the main components (along with some lycophytes) of local or poorly diversified regional vegetation. The low number of species, which is characteristic of opportunistic communities, can be explained by local or regional conditions that would have been stressful for the vascular plants in other areas. During the deposition of the Itarare Group, the main control was probably the cold climate in addition to a relative (liquid) water deficit because the bryophyte vegetation may have belonged to a tundra biome in areas of retreating glaciers. For the Teresina Formation, it is possible that the control was scarce freshwater, an unstable environment and water-saturated soil in a scenario of bryophyte vegetation living around temporary ponds in a wide marginal area of the epeiric sea. (C) 2016 Elsevier Ltd. All rights reserved.


英文关键词Mosses Pleurocarps Megaspores Late Paleozoic Paleoclimatology Glaciation Tundra
类型Article
语种英语
国家Brazil
收录类别SCI-E
WOS记录号WOS:000389556100006
WOS关键词SAO-PAULO STATE ; ITARARE SUBGROUP ; MOSSES ; COALS
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/2XILL650/194769
作者单位1.Univ Estadual Campinas, Inst Geociencias, P Box 6152, BR-13083970 Campinas, SP, Brazil;
2.Univ Estadual Paulista, Dept Geol Aplicada, Inst Geociencias & Ciencias Exatas, Campus Rio Claro,P Box 178, BR-13506900 Rio Claro, SP, Brazil;
3.Petrobras SA, CENPES, PDGEO, Gerencia Bioestratig & Paleoecol Aplicada, Ave Horacio Macedo,950 Predio,20 Sala, BR-21941915 Rio De Janeiro, RJ, Brazil;
4.Univ Estadual Campinas, Inst Geociencias, Programa Posgrad Geociencias, P Box 6752, BR-13083970 Campinas, SP, Brazil
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Ricardi-Branco, Fresia,Rohn, Rosemarie,Longhim, Marcia Emilia,et al. Rare Carboniferous and Permian glacial and non-glacial bryophytes and associated lycophyte megaspores of the Parana Basin, Brazil: A new occurrence and paleoenvironmental considerations[J],2016,72:63-75.
APA Ricardi-Branco, Fresia,Rohn, Rosemarie,Longhim, Marcia Emilia,Costa, Juliana Sampaio,Martine, Ariel Milani,&Christiano-de-Souza, Isabel Cortez.(2016).Rare Carboniferous and Permian glacial and non-glacial bryophytes and associated lycophyte megaspores of the Parana Basin, Brazil: A new occurrence and paleoenvironmental considerations.JOURNAL OF SOUTH AMERICAN EARTH SCIENCES,72,63-75.
MLA Ricardi-Branco, Fresia,et al."Rare Carboniferous and Permian glacial and non-glacial bryophytes and associated lycophyte megaspores of the Parana Basin, Brazil: A new occurrence and paleoenvironmental considerations".JOURNAL OF SOUTH AMERICAN EARTH SCIENCES 72(2016):63-75.
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