DOI: 10.1007/s00531-012-0848-2
Scopus记录号: 2-s2.0-84878114507
论文题名: Analysis of anisotropy of magnetic susceptibility in iron-oolitic beds: A potential tool for paleocurrent identification
作者: Pueyo Anchuela Ó. ; Ramajo Cordero J. ; Gil Imaz A. ; Meléndez Hevia G.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2013
卷: 102, 期: 4 起始页码: 1131
结束页码: 1149
语种: 英语
英文关键词: AMS
; Callovian-Oxfordian boundary
; Iberian range
; Image analysis
; Iron ooids
; Paleocurrent
Scopus关键词: Callovian
; hematite
; image analysis
; iron
; limestone
; lineation
; magnetic anisotropy
; magnetic fabric
; magnetite
; mineralogy
; oolite
; Oxfordian
; paleocurrent
; preferred orientation
; sedimentology
; Iberian Cordillera
; Spain
英文摘要: A combined sedimentological, shape-preferred orientation and anisotropy of magnetic susceptibility (AMS) analysis has been performed at the Arroyofrío Bed (Callovian-Oxfordian boundary level) in the locality of Moneva (Iberian Range, NE Spain). The Arroyofrío bed is a widespread iron-ooid limestone interval forming a condensed sequence. The present study has focused on the analysis of the potential presence of a preferred ooid orientation at the Arroyofrío bed. The obtained data show that ooids were originally ellipsoidal and had an imbricate disposition with respect to the bedding/lamination surface. The main ooid orientation within the bedding plane shows a NNE-SSW trend. Results of AMS analyses show a magnetic foliation parallel or slightly imbricated with respect to bedding and magnetic lineation parallel to the main ooid orientation. Magnetic mineralogy of studied samples shows that AMS is mainly controlled by magnetite with minor contributions of hematite and paramagnetic minerals (that can reach contributions of 35 %). The analyzed ooids show axial ratios between 1.4 and 2.8 (intrinsic anisotropy), while the anisotropy of their distribution shows lower anisotropies (e.g., Rs = 1.15) or very low values of the anisotropic magnetic parameters (e.g., P′ < 1.01). Sedimentary texture, matrix features, bioturbation and fossil content influenced both ooid main orientation and the magnetic fabric. Magnetic lineation and main orientation of long ooid axes are transverse to the inferred coastline in the studied area and parallel to the expected paleocurrent direction with respect to the Ejulve-Maestrazgo paleogeographic high. The direct correlation between AMS magnetic lineation and the ooid analysis permits to demonstrate that the paleocurrent imprint can be recorded by means of AMS despite the highly ferromagnetic context fabric and at coarse deposits. Obtained results support the interest and reliability of AMS to unravel paleocurrent imprints for paleogeographic reconstructions. © 2012 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84878114507&doi=10.1007%2fs00531-012-0848-2&partnerID=40&md5=fcc2bf170dc01ffa1a76d4f76bff8ed3
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70553
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Departamento de Ciencias de la Tierra, Universidad de Zaragoza, C/Pedro Cerbuna, no 12, CP.50.009 Zaragoza, Spain
Recommended Citation:
Pueyo Anchuela Ó.,Ramajo Cordero J.,Gil Imaz A.,et al. Analysis of anisotropy of magnetic susceptibility in iron-oolitic beds: A potential tool for paleocurrent identification[J]. International Journal of Earth Sciences,2013-01-01,102(4)