Clastic sedimentary features of beachrocks and their palaeo-environmental significance:comparison of past and modern coastal regimes  

作　　者：David PSOMIADIS Konstantinos ALBANAKIS Nikoleta ZISI Matthieu GHILARDI Elissavet DOTSIKA 

机构地区：[1]Department of Physical and Environmental Geography,School of Geology,Aristotle University of Thessaloniki,54124,Thessaloniki,Hellas Dr. [2]Institute of Materials Science,N.C.S.R."DEMOKRITOS",15310 Agia Paraskevi Attikis,Hellas Dr. [3]Department of Geology,School of Geology,Aristotle University of Thessaloniki,54124,Thessaloniki,Hellas MSc [4]Centre Europeen de Recherches et d'enseignement des Geosciences de l'Environnement(CEREGE,UMR 6635 CNRS),Europole Mediterraneen de l'Arbois ,BP 80-13545 Aix-en-Provence CEDEX 04,France Dr.

出　　处：《International Journal of Sediment Research》2014年第2期260-268,共9页国际泥沙研究（英文版）

摘　　要：Clastic sedimentary features of beachrocks and unconsolidated deposits of parent beaches were investigated along the northern Aegean coastline（Greece） to assess their suitability in palaeo-environmental reconstruction.Twelve paired datasets were collected in the Thermaikos,Toroneos,Siggitikos and lerissos gulfs of the Chalkidiki Peninsula,the adjoining Kavala Gulf and Thassos Island,comprising beachrock cores and companion beach subsurface sediments.Particle size analyses based on univariate and bivariate statistics suggest that,during the time period of beachrock formation,depositional conditions differed distinctly from those of the modern parent beaches.The results imply difference of maturity level of beach evolution from the time of cementation（coarser materials-early stage of beach formation） to modern situation（finer materials-reworked and ’mature’ beach sediments）.Furthermore,the findings indicate increasing coastal protection due to beachrock exposure in the modern swash zone.In conclusion,it is suggested that textural analysis of beachrocks in comparison with unconsolidated sediments of the parent beach might provide information regarding differences of coastal depositional regimes and future research could focus on specific-layer analysis and comparison.Clastic sedimentary features of beachrocks and unconsolidated deposits of parent beaches were investigated along the northern Aegean coastline（Greece） to assess their suitability in palaeo-environmental reconstruction.Twelve paired datasets were collected in the Thermaikos,Toroneos,Siggitikos and lerissos gulfs of the Chalkidiki Peninsula,the adjoining Kavala Gulf and Thassos Island,comprising beachrock cores and companion beach subsurface sediments.Particle size analyses based on univariate and bivariate statistics suggest that,during the time period of beachrock formation,depositional conditions differed distinctly from those of the modern parent beaches.The results imply difference of maturity level of beach evolution from the time of cementation（coarser materials-early stage of beach formation） to modern situation（finer materials-reworked and ’mature’ beach sediments）.Furthermore,the findings indicate increasing coastal protection due to beachrock exposure in the modern swash zone.In conclusion,it is suggested that textural analysis of beachrocks in comparison with unconsolidated sediments of the parent beach might provide information regarding differences of coastal depositional regimes and future research could focus on specific-layer analysis and comparison.

关 键 词：BEACHROCK Clastic sediments Grain size PALAEOENVIRONMENT Northern Aegean Greece 

分 类 号：P736.2[天文地球—海洋地质] P588.2[天文地球—海洋科学]