气候变化领域集成服务门户(CCPortal): Northward dispersal of dinosaurs from Gondwana to Greenland at the mid-Norian (215–212 Ma, Late Triassic) dip in atmospheric pCO2

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DOI	10.1073/pnas.2020778118
	Northward dispersal of dinosaurs from Gondwana to Greenland at the mid-Norian (215–212 Ma, Late Triassic) dip in atmospheric pCO2
	Kent D.V.; Clemmensen L.B.
发表日期	2021
ISSN	00278424
卷号	118 期号:8
英文摘要	The earliest dinosaurs (theropods and sauropodomorphs) are found in fossiliferous early Late Triassic strata dated to about 230 million years ago (Ma), mainly in northwestern Argentina and southern Brazil in the Southern Hemisphere temperate belt of what was Gondwana in Pangea. Sauropodomorphs, which are not known for the entire Triassic in then tropical North America, eventually appear 15 million years later in the Northern Hemisphere temperate belt of Laurasia. The Pangea supercontinent was traversable in principle by terrestrial vertebrates, so the main barrier to be surmounted for dispersal between hemispheres was likely to be climatic; in particular, the intense aridity of tropical desert belts and unstable climate in the equatorial humid belt accompanying high atmospheric pCO2 that characterized the Late Triassic. We revisited the chronostratigraphy of the dinosaur-bearing Fleming Fjord Group of central East Greenland and, with additional data, produced a correlation of a detailed magnetostratigraphy from more than 325 m of composite section from two field areas to the age-calibrated astrochronostratigraphic polarity time scale. This age model places the earliest occurrence of sauropodomorphs (Plateosaurus) in their northernmost range to ∼214 Ma. The timing is within the 215 to 212 Ma (mid-Norian) window of a major, robust dip in atmospheric pCO2 of uncertain origin but which may have resulted in sufficiently lowered climate barriers that facilitated the initial major dispersal of the herbivorous sauropodomorphs to the temperate belt of the Northern Hemisphere. Indications are that carnivorous theropods may have had dispersals that were less subject to the same climate constraints. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Dinosaurs; Magnetostratigraphy; Paleoclimate; Pangea; Triassic
语种	英语
scopus关键词	Argentina; article; Brazil; carbon dioxide tension; controlled study; desert; dinosaur; Greenland; human; nonhuman; North America; Northern Hemisphere; paleoclimate; Southern Hemisphere; Upper Triassic
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/180537
作者单位	Paleomagnetics Lab, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, United States; Department of Earth and Planetary Sciences, Rutgers University, Piscataway, NJ 08854, United States; Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, DK-1350, Denmark
推荐引用方式 GB/T 7714	Kent D.V.,Clemmensen L.B.. Northward dispersal of dinosaurs from Gondwana to Greenland at the mid-Norian (215–212 Ma, Late Triassic) dip in atmospheric pCO2[J],2021,118(8).
APA	Kent D.V.,&Clemmensen L.B..(2021).Northward dispersal of dinosaurs from Gondwana to Greenland at the mid-Norian (215–212 Ma, Late Triassic) dip in atmospheric pCO2.Proceedings of the National Academy of Sciences of the United States of America,118(8).
MLA	Kent D.V.,et al."Northward dispersal of dinosaurs from Gondwana to Greenland at the mid-Norian (215–212 Ma, Late Triassic) dip in atmospheric pCO2".Proceedings of the National Academy of Sciences of the United States of America 118.8(2021).