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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Radiometric dating re-evaluating the paleoenvironment and paleoclimate around the Plio-Pleistocene boundary in NE China (Changbai Mountains)

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Autor(es):
Kern, Andrea K. [1] ; Kovar-Eder, Johanna [2] ; Stachura-Suchoples, Katarzyna [3] ; Wang, Wei-Ming [4] ; Wang, Pujun [5]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Dept Sedimentary & Environm Geol, BR-05508080 Sao Paulo, SP - Brazil
[2] State Museum Nat Hist, D-70191 Stuttgart - Germany
[3] Bot Garden & Museum Berlin Dahlem, D-14195 Berlin - Germany
[4] Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Key Lab Econ Stratig & Palaeogeog, Nanjing 210008 - Peoples R China
[5] Jilin Univ, Coll Geosci, Changchun 130061 - Peoples R China
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: REVIEW OF PALAEOBOTANY AND PALYNOLOGY; v. 224, n. 2, p. 134-145, JAN 2016.
Citações Web of Science: 1
Resumo

Today, NE China is highly affected by cold and dry winter monsoon winds, causing long and severe winters with monthly mean temperatures below -10 degrees C. Yet, the Neogene paleodimatic history of this region is not well understood due to the lack of precisely dated paleontological localities. Herein, we present several Ar-Ar basalt ages round a plant-bearing diatomite sequence of Badaogou, Changbai Mountains (Jilin Province; NE China border to N-Korea), which allow us to revise its age from Miocene to similar to 2.5 Ma. A paleoenvironmental reconstruction based on fossil leaves, pollen and diatoms suggests deciduous forests rich in Acer, Quercus, Tilia, Litmus and Zelkova mixed with conifers such as Tsuga, Picea and Abies within an already established mountain region close by. These forests were growing around a nutrient rich freshwater system with a pH >7 in a presumably deep basin indicated by the strong dominance of planktonic diatoms Stephanodiscus minutulus and Pliocaenicus changbaiensis. The presence of tree taxa known from southern China today, such as Sassafras, Nyssa, Liquidambar, Podocarpus and Cedrus, leads to significantly warmer temperature estimates by the Coexistence Approach (mean annual temperature 11.5-15.7 degrees C, coldest month mean temperature -0.3-9.6 degrees C, warmest month mean temperature 23.0-27.8 degrees C). Rainfall values aren't as precise, but suggest a mean annual precipitation of 843-1577 mm with monthly extremes of 109-220 mm (wettest), 17-41 mm (driest) and 73-175 mm (warmest). Although records in Eastern and Northern Asia as well as Central China report a cooling and drying after the onset of the Northern Hemisphere glaciation, the paleovegetation in NE China was not yet or hardly affected by the intensification of the winter monsoon. This emphasizes the importance of accurately dated records to improve large-scale paleoclimatic reconstruction as well as our understanding of the complexity of climate change. (C) 2015 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 14/05582-0 - Estruturação e evolução da biota amazônica e seu ambiente: paleobotânica e palinologia da Bacia Amazônica
Beneficiário:Andrea Kern
Linha de fomento: Bolsas no Brasil - Pós-Doutorado