globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2019.115835
论文题名:
Testing the occurrence of Late Jurassic true polar wander using the La Negra volcanics of northern Chile
作者: Fu R.R.; Kent D.V.; Hemming S.R.; Gutiérrez P.; Creveling J.R.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 529
语种: 英语
中文关键词: 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
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.
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被引频次[WOS]:20   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164965
Appears in Collections:气候变化与战略

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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

Recommended Citation:
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]. Earth and Planetary Science Letters,2020-01-01,529
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