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DOI	10.1016/j.tecto.2021.228872
	Paleomagnetic results from Upper Triassic and Middle Jurassic strata of east-central New Mexico, and implication for North American apparent polar wander path
	Mirzaei M.; Housen B.A.; Burmester R.F.; Foreman B.Z.
发表日期	2021
ISSN	00401951
卷号	811
英文摘要	Two apparent polar wander (APWP) paths for North America (NA) diverge during the Jurassic. The path based on paleomagnetic results from igneous rocks of eastern NA, well-dated Ontario kimberlites, and carbonates and radiolarites of Adria (northern Italy - transformed to NA coordinates) has a large gap at high latitude, which could document rapid plate motion or True Polar Wander. The APWP from coeval NA sedimentary rocks define a lower-latitude, more continuous path. The discrepancy between the two paths has been attributed to inclination error (IE) from deposition and compaction of the sediments. New paleomagnetic results from Upper Triassic (Garita Creek, Trujillo, and Redonda Formations) and Middle Jurassic (Entrada, Summerville, and Lower Morrison Formations) sedimentary units of east-central New Mexico have positive reversal and fold tests, which indicate their magnetization, mostly carried by detrital hematite, is primary. Interpretation of noisy and non-linear demagnetization paths was facilitated by a smoothing scheme, which did not bias the mean directions. Using sample-level directions from line fits, IE was estimated ~20° for the Jurassic units, but is negligible for the Triassic units because mean directions are horizontal. Mean paleomagnetic poles for the ~223 Ma (Garita Creek and Trujillo) and ~214 Ma Redonda Formations are 55.7°N/78.7°E/A95 = 3.2° and 59.7°N/81.0°E/A95 = 4.0°; those for the ~163 Ma Summerville and ~155 Ma Morrison Formations are 59.3°N/138.1°E/A95 = 6.5° and 48.7°N/151.8°E/A95 = 7.8°. Simulated ~163 Ma paleomagnetic poles based on Summerville results and a wide range of IE show that no amount of IE correction to the Summerville directions would produce poles consistent with the high-latitude Jurassic APWP. Furthermore, paleomagnetic poles for Trujillo, Redonda, Summerville, and Lower Morrison Formations of east-central New Mexico, even with IE-correction, streak approximately along the 60° parallel (present coordinates) for most of late Triassic and Jurassic, which validates the lower-latitude APWP. Another explanation for the APWP discrepancy is required. © 2021 Elsevier B.V.
关键词	East-central New Mexico Elongation/Inclination Inclination error North American mid-Jurassic Apparent Polar Wander Path Paleomagnetism Summerville Formation
英文关键词	Geomagnetism; Hematite; Igneous rocks; Magnetization reversal; Sedimentology; High Latitudes; Inclination errors; Middle Jurassic; Morrison formations; Paleomagnetic poles; Sedimentary units; True Polar Wander; Upper Triassic; Sedimentary rocks; apparent polar wander path; demagnetization; error analysis; error correction; igneous rock; Jurassic; magnetization; paleomagnetism; polar wandering; Triassic; New Mexico; United States
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/208030
作者单位	Western Washington University, Geology Department, Building: ES 240, 516 High Street, Bellingham, WA 98225-9160, United States
推荐引用方式 GB/T 7714	Mirzaei M.,Housen B.A.,Burmester R.F.,et al. Paleomagnetic results from Upper Triassic and Middle Jurassic strata of east-central New Mexico, and implication for North American apparent polar wander path[J],2021,811.
APA	Mirzaei M.,Housen B.A.,Burmester R.F.,&Foreman B.Z..(2021).Paleomagnetic results from Upper Triassic and Middle Jurassic strata of east-central New Mexico, and implication for North American apparent polar wander path.Tectonophysics,811.
MLA	Mirzaei M.,et al."Paleomagnetic results from Upper Triassic and Middle Jurassic strata of east-central New Mexico, and implication for North American apparent polar wander path".Tectonophysics 811(2021).