Detecting and recognizing centerlines as parabolic sections of the steerable filter response

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Manganska mineralizacija todorokitom po krednim vapnencima u zoni plime i oseke na jugozapadnoj strani Dugog otoka (središnji Jadran, Hrvatska)

The southwest shore of the island of Dugi Otok is characterized by the unusual sample occurrence of Mn-hydrated oxide mineralization in the form of botryoidally and globular, fine-laminated concentric aggregates, crusting the Upper Cretaceous backshore limestones. The mineralization consists mainly of Fe impoverished 10-Å tecto-manganate todorokite (enriched in Mg and transition metals) accompanied by accessory MnO·OH. Todorokite chemical composition is typical of a hydrogenous origin in an oxic shallow marine environment. According to our model, Mn has been recurrently leached and mobilized from the Late Pleistocene sea floor sediments located around 50 nautical miles south of Dugi Otok. We propose a link between the Mn-geochemical anomaly of these sediments and the alteration of distinct, spatial close pre-Holocene tephra, dispersed over the entire recent Adriatic area.Na jugozapadnoj obali Dugog otoka prema otvorenom moru u zoni plime i oseke postoji neobična i obilna pojava mineralizacije manganom u formi hidratiziranih oksida. Javlja se kao ovojnica, kora, tanka presvlaka, odnosno kao grozdasti fino laminirani, koncentrični agregat na gornjokrednim vapnencima i dolomitima. Mineralizaciju čine željezom osiromašeni 10-Å tekto-manganati s prevladavajućim todorokitom. Kemijski sastav todorokita ukazuje na hidrogenetsko podrijetlo u oksičnom okolišu plitkog mora. Držimo da je mangan potrebit za mineralizaciju izlužen i mobiliziran iz pridnenih sedimenata smještenih nekih 50 nautičkih milja južno od mjesta mineralizacije. Mangan je bio izvorno vezan u prhkim piroklastičnim naslagama raspršenim vulkanskim erupcijama iz flegrejskih polja pored Napulja po cijelom jadranskom području neposredno pred početak holocena