Naslov
Tectonic influences on late Holocene relative sea levels from the central-eastern Adriatic coast of Croatia

Autori
Shaw, A, Timothy ; Plater, Andrew ; Kirby, Jason ; Roy, Keven ; Holgate, Simon ; Tutman, Pero ; Cahill, Niamh ; Horton, Benjamin

Izvornik
Quaternary science reviews (0277-3791) 200 (2018); 262-275

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Relative sea level, Adriatic, Croatia, Late Holocene, Glacial isostatic adjustment, Tectonic subsidence, Salt marsh, Foraminifera

Sažetak
Differential tectonic activity is a key factor responsible for variable relative sea-level (RSL) changes during the late Holocene in the Adriatic. Here, we compare reconstructions of RSL from the central-eastern Adriatic coast of Croatia with ICE-7G_NA (VM7) glacial-isostatic model RSL predictions to assess underlying driving mechanisms of RSL change during the past ~ 2700 years. Local standardized published sea-level index points (n ¼ 23) were combined with a new salt-marsh RSL reconstruction and tide-gauge measurements. We enumerated fossil foraminifera from a short salt-marsh sediment core constrained vertically by modern foraminiferal distributions, and temporally by radiometric analyses providing subcentury resolution within a Bayesian age-depth framework.We modelled changes in RSL using an Errors- In-Variables Integrated Gaussian Process (EIV-IGP) model with full consideration of the available uncertainty. Previously established index points show RSL rising from 1.48mat 715 BCE to 1.05m by 100 CE at 0.52 mm/yr (0.82-1.87 mm/yr). Between 500 and 1000 CE RSL was 0.7m below present rising to 0.25mat 1700 CE. RSL rise decreased to a minimum rate of 0.13 mm/yr (0.37-0.64 mm/yr) at ~1450 CE. The salt-marsh reconstruction shows RSL rose ~0.28m since the early 18th century at an average rate of 0.95 mm/yr. Magnitudes and rates of RSL change during the twentieth century are concurrent with long-term tide-gauge measurements, with a rise of ~1.1 mm/yr. Predictions of RSL from the ICE-7G_NA (VM7) glacial-isostatic model (0.25mat 715 BCE) are consistently higher than the reconstruction (1.48mat 715 BCE) during the Late Holocene suggesting a subsidence rate of 0.45 ± 0.6 mm/yr. The new salt-marsh reconstruction and regional index points coupled with glacial-isostatic and statistical models estimate the magnitude and rate of RSL change and subsidence caused by the Adriatic tectonic framework.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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