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Cr-spinel supply in the Brkini, Istrian and Krk Island flysch basins (Slovenia, Italy and Croatia)

Published online by Cambridge University Press:  09 June 2003

DAVIDE LENAZ ,
VADIM S. KAMENETSKY  and
FRANCESCO PRINCIVALLE
DAVIDE LENAZ
Affiliation:
Dipartimento di Scienze della Terra, Università di Trieste, via Weiss 8, I-34127, Trieste, Italy
VADIM S. KAMENETSKY
Affiliation:
School of Earth Sciences and Centre for Ore Deposit Research, University of Tasmania, GPO Box 252-79, Hobart, Tasmania, 7001, Australia
FRANCESCO PRINCIVALLE
Affiliation:
Dipartimento di Scienze della Terra, Università di Trieste, via Weiss 8, I-34127, Trieste, Italy
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Abstract

In Late Cretaceous times, subduction of oceanic crust occurred to the north of the Adria plate and was followed by the formation of ophiolitic complexes. Continental collision in Alpine orogenic belts lasted from Late Cretaceous to Early Tertiary times. The progressive contraction of oceanic crust caused the uplift of previously rifted continental margin and platforms and the formation of foredeep flysch basins. Detrital Cr-spinels are widespread in Eocene sandstones of the Brkini, Istrian and Krk Island foredeep flysch basins. On the basis of their TiO2 content and FeO/Fe2O3 ratio, spinels derived from peridotites and mantle-derived magmatic rocks were distinguished. The first are statistically more abundant and are considered to have been derived from type I and II peridotites. The second appear to be mainly related to backarc basin products. These results suggest that Cr-spinels were derived from the erosion of the Internal Dinarides, where type II and III peridotites are present, and also from the Outer Dinarides, where type I peridotites crop out.

Keywords

detrital mineralschrome spinelflyschAdria Plateprovenance
Type
Original Article
Information
Geological Magazine , Volume 140 , Issue 3 , May 2003 , pp. 335 - 342
Copyright
© 2003 Cambridge University Press

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