Si-P impure Al-Goethite Mineralization on the island of Dugi Otok (Central Adriatic, Croatia)
| Autor: | Branimir Šegvić, Boško Lugović, Neven Tadej, Vladimir Bermanec, Lovro Panjkota |
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| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Geologia Croatica, Vol 61, Iss 1, Pp 19-26 (2008) |
| Druh dokumentu: | article |
| ISSN: | 1330-030X 1333-4875 |
| DOI: | 10.4154/GC.2008.04 |
| Popis: | At the western seaward coast of the island of Dugi Otok, unusual goethite mineralization occurs as the infilling of a system of thin crevices in the Upper 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 assemblages are goethite and coarse grained calcite in composite aggregates. These aggregates contain Al-substituted goethite with metamorphic silicate minerals embedded in the core, (black goethite) armoured by the XRD-pure, almost stoichiometric goethite (brown goethite). The geochemical and mineralogical features of the mineralization suggest an ascending solution from a hidden metamorphic source. We speculate that the source could have been activated by the thermal influx linked to the Pliocene intraplate magmatism in the eastern segment of Adria. |
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