Original scientific paper
https://doi.org/10.20302/NC.2025.34.4
Weathering rate of Late Eocene clastics of Lopar Peninsula (Rab Island, Croatia)
Tihomir Marjanac
; ProGEO-Croatia, Horvatovac 102a, 10000 Zagreb, Croatia (independent researcher)
*
Marina Čalogović
; ProGEO-Croatia, Horvatovac 102a, 10000 Zagreb, Croatia (independent researcher)
* Corresponding author.
Abstract
The weathering rate of coastal rocks of the islands of the eastern Adriatic is generally unknown, and only qualitatively interpreted after cartographic data from various sources and ages. Herein we present our results of monitoring of weathering of Late Eocene sandstones and sandy marls of which Lopar Peninsula on the Island of Rab in the Northern Adriatic Quarnero Bay are built. The monitoring lasted 4 years and the measured annual weathering rate of sandstonesranges from 0.42 to 1.21 mm, whereas the sandy marls were weathered by 1.54 to 1.55 mm. The measured weathering rate is strongly related to the distance of the measurement polygon from the coastline and splash-zone, and protectedness of the micro locality from abrasion by wind-blown quartz sand. The Lopar sand beaches are fed by quartz sand released from Eocene clastics by weathering, and we have estimated the minimal supply of sand from the area of 100 m2 in 100 and 1000 years respectively, assuming the modern climate.
Keywords
sandstones; mineralogical composition of sands; sand-blasting; carbonate leaching; Quarnero Bay; coastal retreat; monitoring; geomorphology
Hrčak ID:
330063
URI
Publication date:
31.7.2025.
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