DOI: 10.1016/j.palaeo.2017.08.036
论文题名: A Late Quaternary palynological record of a palm swamp in the Cerrado of central Brazil interpreted using modern analog data
作者: Cassino R.F. ; Martinho C.T. ; da Silva Caminha S.A.F.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
语种: 英语
英文关键词: Holocene
; Late Pleistocene
; Minas Gerais
; Modern pollen spectra
; Paleoclimate
; South America
英文摘要: The fossil pollen record from a Late Quaternary peat core collected in the São José palm swamp, in the northwest region of Minas Gerais state (Central Brazil), is interpreted using a dataset of modern pollen spectra as modern analogs. Principal component analysis and dissimilarity coefficients were used to compare fossil and modern samples, supporting the interpretation of past environmental dynamics. The results suggest that at ca. 15,700 and ca. 15,400. cal. years. BP, the buriti (Mauritia flexuosa) palm (that characterizes the palm swamps today) was absent and the climate was colder. Around 15,200. cal. years. BP, the increasing occurrence of buriti and the development of the Cerrado stricto sensu, a savanna woodland, indicate a warmer climate. At the end of the Late Pleistocene and during the Pleistocene-Holocene transition, the palm swamp central zone expanded and a dense Cerrado stricto sensu developed, suggesting a warm and humid climate. By the end of the Early Holocene, a much drier climate is suggested by the shrinkage of the palm swamp and a more open regional vegetation. Subsequently, and until ca. 4400. cal. years. BP, a wetter climate is indicated by the extended central zone of the São José palm swamp that reached a maximum expansion at ca. 6500. cal. years. BP. After 3500. cal. years. BP, the predominance of the Campo Sujo, a herbaceous-shrubby vegetation, indicates the return of relatively dry conditions. In the last two millennia, a decrease in the extent of the humid zone of the palm swamp suggests an intensification of drier conditions. Lower precipitation inferred at the end of the Holocene, and the predominantly humid conditions in the Middle Holocene, is different from the general pattern observed in southern and western Cerrado sites, but is in agreement with paleoclimate data from Northeastern Brazil. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68055
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Departamento de Geologia, Universidade Federal de Ouro Preto, Campus Morro do Cruzeiro, CEP 35400-000 Ouro Preto, MG, Brazil; Instituto do Petróleo e dos Recursos Naturais, Pontifícia Universidade Católica do Rio Grande do Sul, Av. Ipiranga, 6681, prédio 96J, CEP 90619-900 Porto Alegre, RS, Brazil; Faculdade de Geociências, Universidade Federal de Mato Grosso, CEP 78060-900 Cuiabá, MT, Brazil
Recommended Citation:
Cassino R.F.,Martinho C.T.,da Silva Caminha S.A.F.. A Late Quaternary palynological record of a palm swamp in the Cerrado of central Brazil interpreted using modern analog data[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01