ISSN 2385-2828
Fisica e Scienze della Terra, volume 1 (2014)
Sezione di
Fisica e Scienze della Terra volume 1 (2014)
7th International Meeting on Taphonomy and Fossilization Ferrara, September 10th-13th, 2014 ABSTRACT BOOK Annali Online dell’Università degli Studi di Ferrara
ANNALI ONLINE DELLʼUNIVERSITÀ DI FERRARA
Sezione di
FISICA E SCIENZE DELLA TERRA Volume 1 (2014)
7th International Meeting on Taphonomy and Fossilization 10th–13th September 2014, Ferrara, Italy
EDITED BY
DAVIDE BASSI AND RENATO POSENATO
UNIVERSITÀ DEGLI STUDI DI FERRARA 2014
ISSN 2385-2828 DOI dx.doi.org/10.15160/fst.v0i0.919 Annali online dellʼUniversità degli Studi di Ferrara Autorizzazione del Tribunale di Ferrara n. 36/21.5.53 Bassi D., Posenato R. (eds) 2014. Abstract book of the 7th International Meeting on Taphonomy and Fossilization, Taphos 2014, Ferrara, September 10th-13th, 2014. Annali online dellʼUniversità di Ferrara, Sez. Fisica e Scienze della Terra, volume 1.
Copyright © 2014 by Università degli Studi di Ferrara Ferrara
Scientific Committee Renato Posenato, Valeria Luciani, Davide Bassi, Ursula Thun Hohenstein (University of Ferrara, Italy) Cesare A. Papazzoni (University of Modena-Reggio Emilia, Italy) James H. Nebelsick (University of Tübingen, Germany) Julio Aguirre, Juan Carlos Braga (University of Granada, Spain) Organizing committee Davide Bassi, Valeria Luciani, Renato Posenato, Ursula Thun Hohenstein (University of Ferrara, Italy) Cesare A. Papazzoni (University of Modena-Reggio Emilia, Italy) Francesco Droghetti, Paolo Chiarelli, Michele Gambetti, Roberta Pancaldi (University of Ferrara, Italy) Alberto Gianoli (INFN, Ferrara) Field Trip Coordinators Renato Posenato, Davide Bassi, Ursula Thun Hohenstein, Federica Fontana, Marco Peresani (University of Ferrara, Italy) Cesare A. Papazzoni (University of Modena-Reggio Emilia, Italy) Institutions Università degli Studi di Ferrara Società Paleontologica Italiana Associazione Italiana di Archeozoologia Istituto Italiano di Preistoria e Protostoria Consorzio Futuro in Ricerca Comune di Ferrara
Contents Programme
1
Map of Ferrara
5
Abstracts
7
Author Index
89
Taphos 2014 logo, project design by Hiroki Yamada (Tokyo)
Taphos 2014, Ferrara
CORALLINE ALGAL FACIES AS AN INDICATORS OF RELATIVE SEA– LEVEL VARIATION IN BEACHROCKS FROM ARRAIAL DO CABO, BRAZIL Frederico Tapajós de Souza Tâmega1, João Wagner Alencar Castro2, Ricardo Coutinho1, Paula Spotorno de Oliveira1 and Davide Bassi3
1. Instituto de Estudos do Mar Almirante Paulo Moreira, Departamento de Oceanografia, Rua Kioto 253, 28930–000, Arraial do Cabo, RJ, Brazil;
[email protected] 2. Universidade Federal do Rio de Janeiro, Museu Nacional, Laboratório de Geologia Costeira, Sedimentologia & Meio Ambiente, Quinta da Boa Vista, São Cristóvão, 20940–040, Rio de Janeiro, RJ, Brazil. 3. Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Ferrara, via Saragat 1, I–44122 Ferrara, Italy
The nature of the ocean–climate relationship can be investigated in a variety of ways and at a number of spatial and temporal scales. The methods are based on several marine paleoclimatic indicators, including sedimentary deposits (beachrocks), erosion (crevices), microfossils (diatoms and foraminifera) or ecological (platforms built by accretion from coralline red algae; CRA). The biotic composition of CRA reflects changes in environmental parameters such as water temperature and bathymetry which occurred during CRA growth. These variations in biotic composition as well as differences in CRA morphology can be used to assess the paleoecological settings. During the Holocene there were many sea level variation along the Brazilian coast. Paleoclimatic indicators (beachrocks) with records of rising sea level up to 1.5 km from the present coast line were found between the cities of Buzios and Cabo Frio, State of Rio de Janeiro, Brazil. Beachrock is a consolidated coastal sedimentary formation resulting from a relatively rapid cementation of beach sediments through the precipitation of (mainly) carbonate cements typically consisting of High–Mg Calcite (HMC) or Aragonite (Ar), however its origin is still not fully understood. Facie analysis of beachrocks shallow–water carbonate succession in the outcrops from Cabo Frio Island (23° S, 42° W; Arraial do Cabo, RJ; Fig. 1) and the subsequent integration of paleoecological data have been used to produce a detailed paleoenvironmental model. Geochronological results obtained from submerged beachrocks suggest that, between 11.940 and 11.240 cal yr BP, the relative sea–level was 4.5 m below the current. This time interval locally records the transition between the late Pleistocene and early Holocene on the coast of Rio de Janeiro State, southeastern Brazil. Analysis of Rhodophyta from species Titanoderma pustulatum (J.V. Lamouroux) Nägeli in the beachrock samples collected in the current mean sea level dated at 7910-7690 cal yr BP indicate a depositional environment in tropical waters with temperatures above 23°C, between the late Pleistocene and early Holocene. These paleo–temperatures are markedly different from the current records, in which the average is approximately 18ºC due to the coastal upwelling phenomenon. During this time interval, the process of beachrock lithification occurred in water conditions much warmer than the present ones. Fig. 1: Study site at Arraial do Cabo (red arrow).
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