Jurassic magnetostratigraphy, 2. Middle-Late Oxfordian of Aguilon, Iberian Cordillera, northern Spain

Details Jurassic magnetostratigraphy, 2. Middle-Late Oxfordian of Aguilon, Iberian Cordillera, northern Spain Jurassic magnetostratigraphy, 2. Middle-Late Oxfordian of Aguilon, Iberian Cordillera, northern Spain

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..76..151s&link_type=abstract

Earth and Planetary Science Letters, Volume 76, Issue 1-2, p. 151-166.

Computer Science

35

Scientific paper

A reproducible magnetic polarity pattern has been obtained from four overlapping stratigraphic sequences of ammonite-rich gray pelagic limestones, spanning part of the Middle and Late Oxfordian (G. transversarium to E. bimammatum ammonite zones). Progressive thermal demagnetization removed a present field overprint. Fold tests, both between- and within-outcrops, are positive. The mean direction of magnetization is 322°, 45° (α95 = 6°), which implies a paleolatitude of 26°N. Frequent changes of polarity were observed. The magnetostratigraphic sequence contains the ammonite zones, subzones, and horizons of the Tethyan faunal realm. Using the reference horizons provided by this detailed ammonite zonation, the polarity zones can be readily correlated among all sections. The composite polarity pattern is predominantly of reversed polarity, punctuated by a number of relatively shorter duration normal polarity intervals. In order to compare this sequence to that of the marine magnetic anomalies, we have revised the age estimates for the pre-M25 marine magnetic normaly pattern according to the most recent time scale. Based on those ages, the sedimentary record at Aguilon suggests a much greater frequency of polarity changes than does either model derived from the two sets of marine magnetic anomalies of this time. This sedimentary record probably is a truer approximation of the actual geomagnetic polarity history because of the continuity of sedimentation in these sections and the inherent ambiguities involved in determining a polarity pattern from the very low amplitudes that everywhere characterize this part of the marine record.

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