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The paleoclimatic evolution of the Permian in the Parana Basin in southern Brazil.

机译：巴西南部巴拉那盆地的二叠纪古气候演化。

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摘要

Several approaches were taken to unravel the paleoclimatic evolution of the Permian in the Paraná Basin in southern Brazil. I utilized climate-sensitive sediment data, sequence stratigraphy, redox-sensitive geochemistry, the chemical index of alteration and floral diversity data. This study suggests that the climate change resulted more from the northward migration of the Gondwana than from any global phenomena. Changes in paleotemperature, paleoprecipitation and depositional environments reflect the shift from temperate to subtropical latitutes. The Paraná Basin began as an inland marine basin at high latitudes influenced by a glacial climate. In the Early Permian, as the continent drifted northward to temperate latitudes, the Paraná Basin witnessed a climatic amelioration; this new cool to warm, humid climate favored the development of extensive vegetation and the accumulation of peat. Progressive subsidence of the basin led to marine transgression in the Early to Middle Permian and the accumulation of marine and organic-rich sediments under warm-temperate conditions. As the continent continued to move toward subtropical latitudes, temperature and aridity increased, which, coupled with the isolation of the former sea from open ocean, ultimately led to the irreversible continentalization of the Paraná Basin in the Late Permian.*; *This dissertation includes a CD that is compound (contains both a paper copy and a CD as part of the dissertation). The CD requires the following application: Adobe Acrobat.
机译：采取了几种方法来揭示巴西南部巴拉那盆地的二叠纪古气候演化。我利用了对气候敏感的沉积物数据，层序地层学，对氧化还原敏感的地球化学，化学变化指数和花卉多样性数据。这项研究表明，气候变化更多是由于冈瓦纳向北迁移而不是任何全球现象造成的。古温度，古降水和沉积环境的变化反映了从温带向亚热带纬度的转变。巴拉那盆地最初是受冰川气候影响的高纬度内陆海洋盆地。在二叠纪早期，随着大陆向北向温带纬度漂移，巴拉那盆地经历了气候改善。这种从凉到暖，潮湿的新气候有利于广泛的植被发展和泥炭的积累。盆地的逐步沉陷导致了早二叠世至中二叠世的海侵，以及在温带条件下海洋和富含有机物的沉积物的积累。随着大陆继续向亚热带纬度发展，温度和干旱度增加，再加上前海与公海的隔离，最终导致了二叠纪后期巴拉那盆地的不可逆转的大陆化。 *本论文包括一张复合CD（该论文既包含纸质副本，又包含CD）。该CD需要以下应用程序：Adobe Acrobat。

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  • 作者

    Goldberg, Karin.;

  • 作者单位

    The University of Chicago.;

  • 授予单位 The University of Chicago.;
  • 学科 Geology.; Geochemistry.; Paleoecology.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 233 p.
  • 总页数 233
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;地质学;古生物学;
  • 关键词

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