DOI: 10.1016/j.epsl.2018.02.034
Scopus记录号: 2-s2.0-85043519556
论文题名: Anomalous Late Jurassic motion of the Pacific Plate with implications for true polar wander
作者: Fu R.R. ; Kent D.V.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 490 起始页码: 20
结束页码: 30
语种: 英语
英文关键词: geodynamics
; Jurassic
; Ocean Drilling Program
; paleomagnetism
; tectonics
; true polar wander
Scopus关键词: Geodynamics
; Lithology
; Submarine geology
; Tectonics
; Coherent velocity
; Continental lithosphere
; Early Cretaceous
; Jurassic
; Ocean drilling programs
; Paleomagnetic analysis
; paleomagnetism
; True Polar Wander
; Geomagnetism
; continental lithosphere
; crust-mantle boundary
; geodynamics
; Jurassic
; mantle plume
; Ocean Drilling Program
; Pacific plate
; paleomagnetism
; plate motion
; polar wandering
; slab
; Pacific Ocean
英文摘要: True polar wander, or TPW, is the rotation of the entire mantle–crust system about an equatorial axis that results in a coherent velocity contribution for all lithospheric plates. One of the most recent candidate TPW events consists of a ∼30° rotation during Late Jurassic time (160–145 Ma). However, existing paleomagnetic documentation of this event derives exclusively from continents, which compose less than 50% of the Earth's surface area and may not reflect motion of the entire mantle–crust system. Additional paleopositional information from the Pacific Basin would significantly enhance coverage of the Earth's surface and allow more rigorous testing for the occurrence of TPW. We perform paleomagnetic analyses on core samples from Ocean Drilling Program (ODP) Site 801B, which were taken from the oldest available Pacific crust, to determine its paleolatitude during the Late Jurassic and Early Cretaceous (167–133 Ma). We find that the Pacific Plate underwent a steady southward drift of 0.49°–0.74° My−1 except for an interval between Kimmeridgian and Tithonian time (157–147 Ma), during which it underwent northward motion at 1.45° ± 0.76° My−1 (1σ). This trajectory indicates that the plates of the Pacific Basin participated in the same large-amplitude (∼30°) rotation as continental lithosphere in the 160–145 Ma interval. Such coherent motion of a large majority of the Earth's surface strongly supports the occurrence of TPW, suggesting that a combination of subducting slabs and rising mantle plumes was sufficient to significantly perturb the Earth's inertia tensor in the Late Jurassic. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109947
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Lamont–Doherty Earth Observatory, Columbia University, Paleomagnetics Laboratory, 61 Route 9W, Palisades, NY 10964, United States; Department of Earth and Planetary Sciences, Harvard University, 20 Oxford St., Cambridge, MA 02138, United States; Department of Earth and Planetary Science, Rutgers University, 610 Taylor Rd, Piscataway, NY 08854, United States
Recommended Citation:
Fu R.R.,Kent D.V.. Anomalous Late Jurassic motion of the Pacific Plate with implications for true polar wander[J]. Earth and Planetary Science Letters,2018-01-01,490