Geocronologia por 14C de TerrasPretas Antropogênicas da Amazônia

  1. Gert Woeltje 1
  2. Francisco J. Santos 2
  3. Rafael García-Tenorio García-Balmaseda 3
  4. Carlos Weiland Ardaiz 1
  5. Manuel Gázquez 1
  6. Juan Pedro Bolívar Raya 1
  1. 1 Universidad de Huelva
    info

    Universidad de Huelva

    Huelva, España

    ROR https://ror.org/03a1kt624

  2. 2 Centro Nacional de Aceleradores (US-J)
  3. 3 Universidad de Sevilla
    info

    Universidad de Sevilla

    Sevilla, España

    ROR https://ror.org/03yxnpp24

Book:
Solos e Água, fontes (esgotáveis) de vida e de desenvolvimento Livro de atas: VII Congresso Ibérico das Ciências do Solo (CICS 2016) VI Congresso Nacional de Rega e Drenagem, 13-15 de Setembro de 2016, Instituto Politécnico de Beja, Beja

Publisher: Sociedade Portuguesa da Ciência do Solo (SPCS)

ISBN: 978-989-99665-0-5

Year of publication: 2016

Pages: 53-56

Type: Book chapter

Abstract

The14C dating is a powerful tool for interpreting events aged from 500 up to 50,000 years. The "Amazonian Dark Earths (ADE)" are anthropogenic soils characterized by an only "A" horizon, showing black color, and containing high concen- trations of pyrogenic carbon, Ca, and P. These soils are distributed along the Amazon basin, especially on plateaus, and the adjacent geological units (KT),are mainly composed byFerralsols (Yellow Latosols) and Acrisols (Argissolos Red-Yellow), intensely weathered. They have been studied for the last 130 years, being ADE soilscharacterized for their high fertility, and specific physico-chemical and archaeological features. The ADEs are classified as Terra Preta (TP) and Terra Mulata (TM). The main hypotheses about their origin argue that the ADE could be formed from organic waste and ashes from fires in the villages, while the TM could arise from the prolonged cultivation practice. The main objective of this study was to develop a 14C geochronology of core soilsof about 65 cm in depth. They were taken from three sites: Hatahara (HA), Costa do Laranjal (CL), and Taisaku Ikeda (TI), which are located at the confluence of the rivers Negro and Solimões(Amazonas, Brazil). The main conclusion of this study has been that the origin hypothesis for TP and TM soils should be reviewed.