Emerzijska površina u paleocenskim karbonatnim naslagama uvale Likva, otok Brač

master's thesis

• Title (english): Subaerial exposure surface in Palaeocene carbonates of Likva Cove, island of Brač
• Author: Natalia Šenolt
• Mentor: Blanka Cvetko Tešović (mentor)
• Committee member: Blanka Cvetko Tešović (predsjednik povjerenstva)
• Committee member: Damir Bucković (član povjerenstva)
• Committee member: Dražen Balen (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Geology); Zagreb
• Defense date and country: 2018-11-16, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geology; Geology and Paleontology

Abstract

Površine prekida taloženja ĉeste su u sljedovima naslaga karbonatnih platformi, pa tako i na podruĉju Jadranske karbonatne platforme. Istraživana površina prekida taloženja nastala je subaerskim izlaganjem sedimenata i erozijom u paleocenskim karbonatima uvale Likva (otok Braĉ) te je prepoznata kao regionalni subaerski nekonformitet na Jadranskoj karbonatnoj platformi. Površina subaerskog izlaganja obilježena je biogenim kalkretama s rizolitima, Microcodium agregatima, alveolarno septalnim strukturama, mikritnim nodulama, crnim klastima („black pebbles“), laminiranim kalkretama i pizoidima. Regionalno subaersko izlaganje, koje je razliĉito trajalo na razliĉitim dijelovima Jadranske karbonatne platforme, uzorkovano je vrlo intenzivnom kasnokrednom sinsedimentacijskom tektonikom koja je vezana za koliziju Jadranske i Euroazijske ploĉe. Iznad prekida taloženja transgresivno dolaze brakiĉni i slatkovodni vapnenci s ostrakodima, gastropodima, cijanobakterijama i oogonijama alga Charophyta.

Abstract (english)

Discontinuity surfaces are common in successions of carbonate platforms, including the Adriatic Carbonate Platform. The studied discontinuity surfaces are formed by subaerial exposure of sediment and erosion in Palaeocene carbonates of Likva cove (island of Braĉ) and it is recognised as regional subaerial unconformity on Adriatic Carbonate Platform. Subaerial exposure surface is characterized with biogenic calcretes with rhizoliths, Microcodium aggregates, alveolar septal fabric, micrite nodules, black pebbles, laminated calcretes and pisoids. Regional subaerial exposure phase of variable duration on different parts of the Adriatic Carbonate Platform was caused by very intensive Late Cretaceous syn-sedimentary tectonics related to the collision of Adria with the Eurasian plate. Brackish and freshwater limestones with ostracods, gastropods, cyanobacteria and Charophyta algae overlie the discontinuity surface.

• Keywords: površina subaerskog izlaganja; regionalni subaerski nekonformitet; kalkrete; paleocenski karbonati; Jadranska karbonatna platforma; otok Braĉ
• Keywords (english): subaerial exposure surface; regional subaerial unconformity; calcretes; Palaeocene carbonates; Adriatic Carbonate Platform; island of Braĉ
• Language: croatian
• URN:NBN: urn:nbn:hr:217:771474
• Study programme: Title: Graduate university study of Geology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra geologije (magistar/magistra geologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2018-11-22 09:00:02