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Si-P impure Al-Goethite Mineralization on the island of Dugi Otok (Central Adriatic, Croatia)

Branimir Šegvić ; Rudarsko geološko naftni fakultet
Boško Lugović ; Rudarsko geološko naftni fakultet
Neven Tadej ; Rudarsko geološko naftni fakultet
Vladimir Bermanec ; Odsjek za geologiju, Prirodoslovno-matematički fakultet
Lovro Panjkota ; Rudarsko geološko naftni fakultet

Puni tekst: engleski pdf 2.370 Kb

str. 19-26

preuzimanja: 510



At the we stern seaward coast of the is land of Dugi otok, unusual goethite mineralization occurs as the in filling of a system of thin crevices in the Up per Cretaceous limestones of the Adriatic carbonate platform. Goethite is exceptionally well ordered and shows a variety of chemical compositions ranging from almost pure FeO·OH to Al-substituted composition accompanied by high Si and P impurity. The most characteristic textural type as asemblages are goethite
and coarse grained cal cite in composite aggregates. These aggregates contain Al-substituted goethite with metamorphic
silicate minerals embedded in the co re (black goethite), armoured by the XR D-pure, al most stoichiometric goethite (brown goethite). The geochemical and mineralogical features of the mineralization suggest an as cending solution
from a hid den me tamorphic source. We speculate that the source could have been activated by the thermal in flux linked to the Pliocene intraplate magmatism in the eastern segment of Adria.

Ključne riječi

Al-goethite; stoichiometric goethite; crystalochemistry; endogenic origin; Dugi otok; Adriatic Sea; Adria microplate; Croatia

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