Arid
DOI10.1016/j.palaeo.2015.05.028
Quasi-static Eocene-Oligocene climate in Patagonia promotes slow faunal evolution and mid-Cenozoic global cooling
Kohn, Matthew J.1; Stroemberg, Caroline A. E.2,3; Madden, Richard H.4; Dunn, Regan E.2,3; Evans, Samantha1; Palacios, Alma1; Carlini, Alfredo A.5
通讯作者Kohn, Matthew J.
来源期刊PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
EISSN1872-616X
出版年2015
卷号435页码:24-37
英文摘要

New local/regional climatic data were compared with floral and faunal records from central Patagonia to investigate how faunas evolve in the context of local and global climates. Oxygen isotope compositions of mammal fossils between c. 43 and 21 Ma suggest a nearly constant mean annual temperature of 16 +/- 3 degrees C, consistent with leaf physiognomic and sea surface studies that imply temperatures of 16-18 degrees C Carbon isotopes in tooth enamel track atmospheric delta C-13, but with a positive deviation at 27.2 Ma, and a strong negative deviation at 21 Ma. Combined with paleosol characteristics and reconstructed Leaf Area Indices (rLAIs), these trends suggest aridification from 45 Ma (c. 1200 mm/yr) to 43 Ma (c. 450 mm/yr), quasi-constant MAP until at least 31 Ma, and an increase to similar to 800 mm/yr by 21 Ma. Comparable MAP through most of the sequence is consistent with relatively constant floral compositions, rLAI, and leaf physiognomy. Abundance of palms reflects relatively dry-adapted lineages and greater drought tolerance under higher km. Pedogenic carbonate isotopes imply low P-CO2 = 430 +/- 300 ppmv at the initiation of the Eocene-Oligocene climatic transition. Arid conditions in Patagonia during the late Eocene through Oligocene provided dust to the Southern Ocean, enhancing productivity of silicifiers, drawdown of atmospheric CO2, and protracted global cooling. As the Antarctic Circumpolar Current formed and Earth cooled, wind speeds increased across Patagonia, providing more dust in a positive climate feedback. High tooth crowns (hypsodonty) and ever-growing teeth (hypselodonty) in notoungulates evolved slowly and progressively over 20 Ma after initiation of relatively dry environments through natural selection in response to dust ingestion. A Ratchet evolutionary model may explain protracted evolution of hypsodonty, in which small variations in climate or dust delivery in an otherwise static environment drive small morphological shifts that accumulate slowly over geologic time. (C) 2015 Elsevier B.V. All rights reserved.


英文关键词Hypsodonty Notoungulate Atmospheric CO2 Stable isotopes Precipitation Dust
类型Article
语种英语
国家USA ; Argentina
收录类别SCI-E
WOS记录号WOS:000359963500003
WOS关键词CARBON-ISOTOPE FRACTIONATION ; ATMOSPHERIC CO2 ; ANTARCTIC GLACIATION ; SAVANNA VERTEBRATES ; PEDOGENIC CARBONATE ; UNGULATE MAMMALS ; SOUTH-AMERICA ; RED QUEEN ; NEW-WORLD ; HISTORY
WOS类目Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS研究方向Physical Geography ; Geology ; Paleontology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/189512
作者单位1.Boise State Univ, Dept Geosci, Boise, ID 83725 USA;
2.Univ Washington, Dept Biol, Seattle, WA 98195 USA;
3.Univ Washington, Burke Museum Nat Hist & Culture, Seattle, WA 98195 USA;
4.Univ Chicago, Dept Organismal Biol & Anat, Chicago, IL 60637 USA;
5.Univ Natl La Plata CONICET, Dept Paleontol Vertebrados, La Plata, Buenos Aires, Argentina
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GB/T 7714
Kohn, Matthew J.,Stroemberg, Caroline A. E.,Madden, Richard H.,et al. Quasi-static Eocene-Oligocene climate in Patagonia promotes slow faunal evolution and mid-Cenozoic global cooling[J],2015,435:24-37.
APA Kohn, Matthew J..,Stroemberg, Caroline A. E..,Madden, Richard H..,Dunn, Regan E..,Evans, Samantha.,...&Carlini, Alfredo A..(2015).Quasi-static Eocene-Oligocene climate in Patagonia promotes slow faunal evolution and mid-Cenozoic global cooling.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,435,24-37.
MLA Kohn, Matthew J.,et al."Quasi-static Eocene-Oligocene climate in Patagonia promotes slow faunal evolution and mid-Cenozoic global cooling".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 435(2015):24-37.
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