DOI: 10.1016/j.epsl.2018.02.014
Scopus记录号: 2-s2.0-85044355760
论文题名: Cenozoic to Cretaceous paleomagnetic dataset from Egypt: New data, review and global analysis
作者: Perrin M. ; Saleh A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 488 起始页码: 92
结束页码: 101
语种: 英语
英文关键词: Cenozoic
; Cretaceous
; Egypt
; paleomagnetism
Scopus关键词: Lithology
; Magnetite
; Cenozoic
; Cretaceous
; Egypt
; Paleomagnetic poles
; paleomagnetism
; Remanent magnetization
; Rock magnetic properties
; Titanomagnetites
; Geomagnetism
; Cenozoic
; Cretaceous
; data set
; demagnetization
; magnetite
; paleomagnetism
; polar wandering
; remagnetization
; remanent magnetization
; titanomagnetite
; Egypt
英文摘要: Different phases of igneous activity took place in Egypt during the Mesozoic and the Cenozoic and oriented samples were collected from three Cenozoic localities (Baharya oasis in the Western Desert, Abu Had in the Eastern Desert and Quseir along the Red Sea coast), and four Cretaceous localities (Toshki & Abu Simbel south of Aswan, and Shalaten & Abu Shihat along the Red Sea coast). Rock magnetic properties of the samples indicate magnetite and titanomagnetite as the main carrier of the remanent magnetization. Following stepwise demagnetization, characteristic remanent directions were identified only for 62% of the samples, a fairly low rate for that type of samples, and 8 new paleomagnetic poles were calculated. All our Cenozoic poles fall clearly off Master Polar Wander Paths proposed for South Africa. Therefore, all paleomagnetic results, previously published for Egypt, were compiled from Cretaceous to Quaternary. The published poles largely overlap, blurring the Egyptian Apparent Polar Wander Path. A new analysis at the site level was then carried out. Only poles having a kappa larger than 50 were selected, and new pole positions were calculated by area and by epoch, when at least 3 sites were available. Even though the selection drastically reduced the number of considered poles, it allows definition of a reliable Cenozoic apparent polar wander trend for Egypt that differs from the South African Master Polar Wander Path by about 10–15 °. If the Cretaceous igneous poles are in good agreement with the rest of the African data, the sedimentary poles plot close to the Cenozoic portion of the South African Master Polar Wander Path, a discrepancy that could be related either to inclination flattening and/or error on age and/or remagnetization in the Cenozoic. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109996
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: Aix-Marseille Univ, CNRS, IRD, Coll France, CEREGE, Aix en Provence, France; National Research Institute of Astronomy and Geophysics, Egypt
Recommended Citation:
Perrin M.,Saleh A.. Cenozoic to Cretaceous paleomagnetic dataset from Egypt: New data, review and global analysis[J]. Earth and Planetary Science Letters,2018-01-01,488