Mudanças paleoambientais no início e no final do Holocénico
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Mudanças paleoambientais no início e no final do Holocénico

Mudanças paleoambientais no início e no final do Holocénico


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About the Book

Dois lagos situados nas colinas de Palani, Tamil Nadu, Índia, foram investigados para reconstruir as flutuações da monção sudoeste desde o início do período Holocénico. Foram recolhidos núcleos de sedimentos de ambos os lagos e datados por radiocarbono. As idades revelam fases não lineares de deposição. O núcleo do lago Berijam está datado de 2400 anos BP até à atualidade. Foram obtidas idades mais antigas para o núcleo de sedimentos do lago Kukkal (9000 anos BP até à atualidade). No núcleo de sedimentos do lago Kukkal, observou-se um ótimo clima Holocénico húmido (9000 anos a 5000 anos BP). No entanto, de 5000 anos BP até ao presente, prevaleceram condições mais secas devido ao declínio da intensidade das monções do sudoeste. Durante este longo período seco, ocorreram vários eventos mais húmidos de menor duração. Os eventos do período quente medieval e da Pequena Idade do Gelo foram registados no núcleo do lago Berijam. A relação C/N dos sedimentos dos lagos Berijam e Kukkal indica que o carbono orgânico provém principalmente das algas lacustres e das ervas aquáticas. Os dados polínicos revelam uma vegetação de savana em torno do lago Kukkal durante o Holoceno inicial, mas que mudou para uma cobertura vegetal mais aberta devido ao ambiente seco desde o Holoceno médio até ao presente.


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Product Details
  • ISBN-13: 9786207298938
  • Publisher: KS Omniscriptum Publishing
  • Binding: Paperback
  • Language: Portuguese
  • Returnable: N
  • Sub Title: Lagos Berijam e Kukkal
  • Width: 152 mm
  • ISBN-10: 6207298934
  • Publisher Date: 22 Mar 2024
  • Height: 229 mm
  • No of Pages: 140
  • Spine Width: 8 mm
  • Weight: 217 gr


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Mudanças paleoambientais no início e no final do Holocénico
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