New palaeomagnetic results from imbricated Adria: 1st island and related areas

Emo Marton, Alan Moro

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

For the purpose of this work samples for palaeomagnetic analysis were taken from Upper Cenomanian and Lower Senonian shallow water limestones, as well as from Senonian pelagic limestones from both 1st and the surrounding islands. This area belongs to Imbricated Adria, which is characterized by gently folded and faulted strata with a Dinaridic (NW-SE) trend. An exception is Premuda island where the beds are strongly folded and are subvertical. A total of 96 samples were drilled from 10 localities distributed between eight islands. The samples were then subjected to standard palaeomagnetic laboratory analysis and statistical evaluation. Eventually, six localities yielded statistically well-defined palaeomagnetic directions, which were shown pre date the folding in age. The overall mean palaeomagnetic direction obtained for the study area, characterizing the Cenomanian-Early Seno- nian time period had a Declination of 334°, Inclination=+46°, with statistical parameters k=188, α95=4.9°, defining a palaeomagnetic pole at A(N)=63°, f (E)=254°, <5p=4.0°, <5m=6.2°. This was compared with palaeomagnetic directions obtained for rocks of similar ages from stable Istria and the Kvarner islands. As the three palaeomagnetic directions are statistically identical, we conclude that there was no significant relative movement between the three areas after the Early Senonian. The palaeomagnetic declination for the study area, which characterizes the post-Early Senonian rotation of the Adriatic microplate, is the same as the declination for the Pannonian-Pontian age group from the South Pannonian basin. As the palaeomagnetic signals in both cases are primary, the results of the present paper not only support the conclusion that the rotating Adriatic microplate triggered rotations in the South Pannonian basin, but also suggest that the Adriatic platform did not change its orientation between the late Cretaceous and the Early Pontian.

Original languageEnglish
Pages (from-to)107-114
Number of pages8
JournalGeologia Croatica
Volume62
Issue number2
DOIs
Publication statusPublished - 2009

Keywords

  • Imbricated adria
  • Late cretaceous
  • Palaeomagnetism

ASJC Scopus subject areas

  • Geology
  • Earth and Planetary Sciences (miscellaneous)

Fingerprint Dive into the research topics of 'New palaeomagnetic results from imbricated Adria: 1st island and related areas'. Together they form a unique fingerprint.

  • Cite this