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Mn-crust todorokite mineralization on SW backshore Cretaceous limestones from the island of Dugi Otok (Central Adriatic, Croatia)

Boško LUGOVIĆ ; Rudarsko-geološko-naftni fakultet Sveučilišta u Zagrebu, Pierottijeva 6, HR-10000 Zagreb, Hrvatska
Branimir ŠEGVIĆ ; Rudarsko-geološko-naftni fakultet Sveučilišta u Zagrebu, Pierottijeva 6, HR-10000 Zagreb, Hrvatska
Tanja ŠEGVIĆ ; Institut za oceanografiju i ribarstvo, P.P. 500, HR-21000 Split, Hrvatska


Puni tekst: engleski pdf 488 Kb

str. 53-63

preuzimanja: 496

citiraj


Sažetak

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.

Ključne riječi

10-Å manganates, todorokite, hydrogenous origin, pre-Holocene tephra, Dugi Otok island, Adriatic

Hrčak ID:

26477

URI

https://hrcak.srce.hr/26477

Podaci na drugim jezicima: hrvatski

Posjeta: 1.132 *