DOI: 10.1016/j.quascirev.2018.06.019
Scopus记录号: 2-s2.0-85048979672
论文题名: The contribution of geochemistry to ancient harbor geoarcheology: The example of Ostia Antica
作者: Delile H. ; Goiran J.P. ; Blichert-Toft J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 193 起始页码: 170
结束页码: 187
语种: 英语
英文关键词: Ancient harbor basins
; Geoarcheology
; Geochemistry
; Ostia Antica
; Pb isotopes
; Rome
; Sedimentology
; Tiber river
Scopus关键词: Deposits
; Geochemistry
; Isotopes
; Sedimentology
; Sediments
; Geoarcheology
; Harbor basins
; Ostia Antica
; Pb isotopes
; Rome
; Ports and harbors
英文摘要: Once trapped in ancient harbor basins, sediments form environmental archives that have been widely studied by geoarcheologists in recent decades, especially to help reconstruct fluvio-marine landscapes of the last millennia. In some cases, classic environmental markers cannot be used for this purpose either because of their scarcity in the sedimentary deposits, or because analytical costs limit the resolution that can be achieved. In order to remedy these shortcomings, and to complement the more commonly used proxies, elemental and isotopic geochemistry has been added to the geoarcheological toolkit. Here we show how to “read” the evolution of the paleo-environmental dynamics in the water column of Ostia Antica (Rome's first maritime harbor) using the geochemical and isotopic record of a 3000-year-old sediment core drilled in the ancient harbor basin. A comparison of the results obtained from Ostia Antica with those of other ancient Mediterranean harbors reveals the nature of the main environmental processes operating during the formation of sedimentary deposits in harbor basins. From this comparative approach, it appears that the respective weight of each control factor is dependent on the coastal geomorphological context of the sites where the harbors were established. Since the discovery of the harbor of Ostia Antica in 2014, this method has provided the means, for the first time, to identify two distinct harbor basin regimes; an initial marine-dominated regime from the middle of the 4th c. BC to ∼ the 3rd c. BC, and a later freshwater-dominated regime up to the 2nd c. BC. More generally, we observe the effects of the dynamics of the deltaic progradation of the Tiber, which very early on was subject to a hydro-climatic component, on the processes of alluviation of the harbor basin. Additionally, and also for the first time in harbor geoarcheology, Pb isotope compositions measured specifically on uncontaminated sediments demonstrate their utility for both identifying the geological sources of the sediments of the Tiber delta and discriminating finer from larger particles. The present study further provides an opportunity to test the validity of two hypotheses recently put forward: (1) that a series of three tsunamis is recorded in the harbor silts, and (2) that an initial lagoon-type harbor was constructed at Ostia Antica, which later evolved into a fluvial harbor. Neither of these hypotheses are supported by the present data. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112121
Appears in Collections: 气候减缓与适应
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作者单位: Maison de l'Orient et de la Méditerranée, CNRS UMR 5133, Cedex 7, Lyon, 69365, France; Ecole Normale Supérieure de Lyon, Université Claude Bernard-Lyon I, CNRS UMR 5276, Lyon, 69007, France
Recommended Citation:
Delile H.,Goiran J.P.,Blichert-Toft J.. The contribution of geochemistry to ancient harbor geoarcheology: The example of Ostia Antica[J]. Quaternary Science Reviews,2018-01-01,193