Facijesi i stratigrafija mastrihtskih naslaga uvale Likva, otok Brač

master's thesis

• Title (english): Facies and stratigraphy of Maastrichtian deposits in Likva Cove, the Island of Brač
• Author: Ivana Golec
• Mentor: Blanka Cvetko Tešović (mentor)
• Committee member: Blanka Cvetko Tešović (predsjednik povjerenstva)
• Committee member: Marijan Kovačić (član povjerenstva)
• Committee member: Damir Bucković (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Geology); Zagreb
• Defense date and country: 2017-03-17, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geology

Abstract

Glavnu strukturu otoka Brača čini kosa antiklinala pružanja istok-zapad. Većina
stijena od kojih je otok izgrađen gornjokredne je starosti, a tek manji dio otoka čine
paleogenske naslage. Uvala Likva smještena je na sjeverozapadnom dijelu Brača, nedaleko od
Sutivana. Gornja kreda je razdoblje značajnih promjena na području Jadransko-Dinaridske
karbonatne platforme koje su posljedica sinsedimentacijske tektonske aktivnosti, globalnih
promjena morske razine te nepovoljnih uvjeta krajem krede. Gornjokredni (mastrihtski)
vapnenci u uvali Likva izgrađeni su od mikritnih, rudistnih, laminiranih mikritnih vapnenaca
te vapnenaca s okršenim ostacima grebenotvornih organizama koji indiciraju diferencijaciju
plitkomorskih taložnih okoliša. Udubljenja („rupe“) na površini vapnenaca s intraklastičnom,
tamnosivom–crnom ispunom, razlika u mikrofacijesnim tipovima između osnovne stijene i
materijala ispune te crni klasti (black pebbles) ukazuju na povremena subaerska izlaganja
dijelova karbonatne platforme i odražavaju karstifikacijske procese kao i procese postanka tla
koji su tipični za karbonatnu podlogu. Ti su se procesi odvijali u gornjoj vadoznoj zoni, u
vegetaciji bogatom terenu i u uvjetima aridne klime najvjerojatnije za vrijeme vršnog
mastrihta.

Abstract (english)

The main structure on Island of Brač is oblique anticline, which stretches in the
direction of east-west. The Island is mainly build-up of the Upper Cretaceous and, to a lesser
extent, Paleogene deposits. Likva Cove is situated in the north-western part of the Island, near
Sutivan. Upper Cretaceous is a period of many changes for Adriatic-Dinaridic Carbonate
Platform that caused by synsedimentary tectonic activity, the global sea level change and
adverse conditions at the end of the Cretaceous. Upper Cretaceous (Maastrichtian) limestone
on the island of Brač, in Likva Cove, are made of micritic, laminated micritic limestone and
limestone with karsted reef remains of organisms that indicate differentiation of shallow water
depositional environments. Indentations (“holes”) on the surface of limestone, containing
intraclastic, dark gray–black, filling, differences between basic rock and fill material
microfacies types and black clasts (black pebbles) indicate occasional subaerial exposure parts
of the carbonate platform and reflect karstification and soil-forming processes typical for
carbonate substrates. These processes occurred in the upper vadose zone of a vegetated area,
under arid climate and, probably, during uppermost Maastrichtian.

• Keywords: emerzija; mastrihtski vapnenci; diferencijacija taložnih okoliša; Jadransko- Dinaridska karbonatna platforma; uvala Likva
• Keywords (english): subaerial exposure; Maastrichtian limestone; differentiation of depositional environments; Adriatic-Dinaridic Carbonate Platform; Likva Cove
• Language: croatian
• URN:NBN: urn:nbn:hr:217:416908
• 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; Embargo expiration date: 2018-03-17
• Created on: 2017-03-22 10:47:41