PETROGRAPHIC AND GEOCHEMICAL CORRELATION BETWEEN ARTIFACTS FROM THE MESOLITHIC LAYERS OF VELA SPILA AND THE MAGMATIC ROCKS OF CENTRAL DALMATIAN ISLANDS

U ovom se radu predstavlja petrografska i geokemijska analiza artefakta iz groba 2 otkopanoga u mezolitičkim naslagama Vele spile. Stijena od koje je sastavljen magmatskog je porijekla, što znači da ne potječe s Korčule, a izbor lokacija sužen je na samo nekoliko jadranskih vulkanskih otočića. Rezultat komparativne analize artefakta iz Vele spile i uzoraka sličnoga kamena s Palagruže, Brusnika, Jabuke i iz Komiže s velikom sigurnošću upućuje na Palagružu kao lokaciju odakle je valutak gabrodiorita donesen na Korčulu. Ovaj je podatak najstarija potvrda plovidbe Jadranom i ukazuje na to da je smjer Gargano – Palagruža – Korčula bio važan za nabavljanje sirovine, a vjerojatno i kao pravac širenja mezolitičke (i još starije) populacije.This work presents a petrographic and geochemical analysis of artifacts from grave 2 excavated in the Mesolithic layers of Vela spila. The rock from which it is composed is magmatic in origin, which means that it is not originally from Korčula, so that the selection has been narrowed to only a few Adriatic volcanic islets. The results of comparative analysis of the artifacts from Vela spila and samples of similar rocks from Palagruža, Brusnik, Jabuka and Komiža largely indicate that Paragruža is the site from which the round gabbro-diorite stone was brought to Korčula. This data is the oldest confirmation of navigation on the Adriatic Sea and indicates that the Gargano-Palagruža-Korčula route was vital for procuring raw materials, and probably as an avenue for the spread of the Mesolithic (and even earlier) populations

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

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

The tectonic evolution of a critical segment of the Dinarides‐Alps connection: Kinematic and geochronological inferences from the Medvednica Mountains, NE Croatia

The transition zone between the Alps and Dinarides is a key area to investigate kinematic interactions of neighboring orogens with different subduction polarities. A study combining field kinematic and sedimentary data, microstructural observations, thermochronological data (Rb‐Sr and fission track), and regional structures in the area of Medvednica Mountains has revealed a complex polyphase tectonic evolution. We document two novel stages of extensional exhumation. The first stage of extension took place along a Late Cretaceous detachment following the late Early Cretaceous nappe stacking, burial, and greenschist facies metamorphism. Two other shortening events that occurred during the latest Cretaceous‐Oligocene were followed by a second event of extensional exhumation, characterized by asymmetric top‐NE extension during the Miocene. Top‐NW thrusting took place subsequently during the Pliocene inversion of the Pannonian Basin. The Cretaceous nappe burial, Late Cretaceous extension, and the Oligocene(‐Earliest Miocene) contraction are events driven by the Alps evolution. In contrast, the latest Cretaceous‐Eocene deformation reflects phases of Dinaridic contraction. Furthermore, the Miocene extension and subsequent inversion display kinematics similar with observations elsewhere in the Dinarides and Eastern Alps. All these processes demonstrate that the Medvednica Mountains were affected by Alpine phases of deformations to a much higher degree than previously thought. Similarly with what has been observed in other areas of contractional polarity changes, such as the Mediterranean, Black Sea, or New Guinea systems, the respective tectonic events are triggered by rheological weak zones which are critical for localizing the deformation created by both orogens