Implications of a combined biostratigraphic and palaeomagnetic study of the Umbrian Maiolica Formation

Simonetta Cirilli, P. Márton, Luigi Vigli

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

The study of a 275.5 m thick section of white, pelagic limestones occupying the valley of the Fonte del Giordano river on the southern slope of Mt. Montagnola has yielded a biostratigraphically controlled clear magnetic reversal pattern after thermal cleaning. The magnetic stratigraphy of the lower 131 m of the section (Calpionellid zones) is correlatable with the M-sequence of oceanic magnetic anomalies between M-19 and M-14. The reversal stratigraphy of the upper 81.5 m of the section (Radiolaria zone) has also been tied to the oceanic polarity time scale by making linear interpolation for a missing 63 m thickness underneath it. Besides the Fonte del Giordano section two Berriasian outcrops each with a different bedding attitude were studied at Gubbio and near Cagli for tectonic tilt test giving positive results. The mean palaeomagnetic pole position for the Late Jurassic/Early Cretaceous after bedding correction is: Φ = 19.1°, Λ = 288.2°, k = 148.7, α95 = 10.2° (N = 3), confirming the presence of a large swing in the polar path, a common behaviour of apparent polar wandering for the peri-Adriatic region during this time.

Original languageEnglish
Pages (from-to)203-214
Number of pages12
JournalEarth and Planetary Science Letters
Volume69
Issue number1
DOIs
Publication statusPublished - 1984

Fingerprint

Stratigraphy
stratigraphy
polar wandering
radiolaria
Berriasian
magnetic reversal
Calcium Carbonate
Tectonics
magnetic anomaly
tilt
interpolation
Cleaning
Poles
Interpolation
outcrop
Jurassic
Rivers
limestone
Cretaceous
timescale

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

Implications of a combined biostratigraphic and palaeomagnetic study of the Umbrian Maiolica Formation. / Cirilli, Simonetta; Márton, P.; Vigli, Luigi.

In: Earth and Planetary Science Letters, Vol. 69, No. 1, 1984, p. 203-214.

Research output: Contribution to journalArticle

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