气候变化领域集成服务门户(CCPortal): Testing the occurrence of Late Jurassic true polar wander using the La Negra volcanics of northern Chile

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DOI	10.1016/j.epsl.2019.115835
	Testing the occurrence of Late Jurassic true polar wander using the La Negra volcanics of northern Chile
	Fu R.R.; Kent D.V.; Hemming S.R.; Gutiérrez P.; Creveling J.R.
发表日期	2020
ISSN	0012821X
卷号	529
英文摘要	True polar wander (TPW) is the reorientation of the crust-mantle system driven by the redistribution of masses in the mantle and on the Earth's surface. In the ideal case, characterization of TPW requires paleomagnetic constraints on the motion of all major plates and independent reconstructions of relative plate positions. While such complete datasets are absent for pre-Mesozoic TPW inferences due to the absence of oceanic plates, they are available for the Late Jurassic (165-145 Ma) “monster shift”, a ∼30° amplitude proposed TPW event. Here we perform paleomagnetic sampling and Ar-Ar geochronology on the La Negra volcanics of Northern Chile, producing two new paleomagnetic poles with ages 165.8 ± 1.8 Ma (1σ; 84.3°N 0.9°E; α95=7.6°; N=28) and 152.8 ± 0.8 Ma (84.5°N 256.4°E; α95=10.8°; N=18). By combining these data with other recently published results, we compute a net lithospheric rotation of 25.3° ± 7.3° (1σ) at a mean rate of 1.21° ± 0.35° My−1 between 170 and 145 Ma with a peak rate of 1.46° ± 0.65° My−1 between 160 and 145 Ma. These rates are consistent with inferences from the Pacific Plate, implying true whole lithosphere rotation. Given coherent motion involving the entire lithosphere, we conclude that the Earth underwent rapid TPW between approximately 165 and 145 Ma, potentially driven by the cessation of subduction along the western North American margin. © 2019 Elsevier B.V.
关键词	geochronology geodynamics geophysics Jurassic Period paleomagnetism tectonics
英文关键词	Geochronology; Geodynamics; Geophysics; Lanthanum; Structural geology; Tectonics; Coherent motion; Earth's surface; Jurassic period; North American; Northern Chile; Paleomagnetic poles; paleomagnetism; True Polar Wander; Geomagnetism; argon-argon dating; geochronology; geodynamics; geophysics; Jurassic; lithosphere; Pacific plate; paleomagnetism; plate tectonics; polar wandering; Chile
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202587
作者单位	Department of Earth and Planetary Sciences, Harvard University, 20 Oxford St., Cambridge, MA 02138, United States; Lamont-Doherty Earth Observatory, Columbia University, 61 Route 9W, Palisades, NY 10964, United States; Department of Earth and Planetary Science, Rutgers University, 610 Taylor Rd, Piscataway, NY 08854, United States; Departamento de Ciencias Geológicas, Universidad Catolica del Norte, Avenida Angamos 0610, Antofagasta, Chile; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, 104 CEOAS Admin Building, Corvallis, OR, United States
推荐引用方式 GB/T 7714	Fu R.R.,Kent D.V.,Hemming S.R.,et al. Testing the occurrence of Late Jurassic true polar wander using the La Negra volcanics of northern Chile[J],2020,529.
APA	Fu R.R.,Kent D.V.,Hemming S.R.,Gutiérrez P.,&Creveling J.R..(2020).Testing the occurrence of Late Jurassic true polar wander using the La Negra volcanics of northern Chile.Earth and Planetary Science Letters,529.
MLA	Fu R.R.,et al."Testing the occurrence of Late Jurassic true polar wander using the La Negra volcanics of northern Chile".Earth and Planetary Science Letters 529(2020).