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Doctoral Thesis
DOI
https://doi.org/10.11606/T.44.2019.tde-10102019-103402
Document
Author
Full name
Rafael Casati
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2019
Supervisor
Committee
Giannini, Paulo Cesar Fonseca (President)
Blasis, Paulo Antonio Dantas de
Fornari, Milene
Millo, Christian
Simões, Marcello Guimarães
Villagran, Ximena Suarez
Title in Portuguese
O registro climático e ambiental das conchas de sambaquis e depósitos paleolagunares na costa centro-sul Catarinense
Keywords in Portuguese
Anomalocardia brasiliana
Holoceno
Paleolaguna
Sambaqui
Santa Catarina
Abstract in Portuguese
Conchas de moluscos arquivam as condições climáticas e ambientais vigentes à época de vida dos organismos que as produziram, e mesmo após a sua morte, sob a forma de assinaturas tafonômicas, isotópicas e geoquímicas. No litoral centro-sul de Santa Catarina, encontram-se dois tipos de depósitos conchíferos formados entre cerca de 8 ka e 1,5 ka cal AP, os depósitos naturais ou paleolagunares, cujo topo hoje se situa cerca de 80 cm abaixo da superfície e, os sambaquis, sítios arqueológicos monticulares com até dezenas de metros de espessura, intencionalmente construídos e compostos predominantemente por conchas de Anomalocardia brasiliana oriundas das lagunas adjacentes. Esta pesquisa integra resultados de análise de fácies, composição taxonômica e caracterização tafonômica de depósitos conchíferos de ambos os tipos com datação e análise geoquímica (Mg/Ca, Sr/Ca e Ba/Ca) e isotópica (?13C e ?18O) de valvas de A. brasiliana neles coletadas. Estes resultados, que cobrem o intervalo de tempo aproximado de 7 ka a 1,5 ka AP, permitiram inferir que o declínio no NRM desde cerca de 5,5 ka, o fechamento progressivo do sistema lagunar, acelerado após essa data, e o aumento mais ou menos simultâneo na precipitação regional reduziram a salinidade média das águas desse sistema, e por consequência, as populações de A. brasiliana, sensível a salinidades abaixo de 17. Esta alteração ambiental, bem como o encolhimento dos bancos de moluscos por conta do assoreamento lagunar, diminuíram a disponibilidade de suas conchas como material construtivo dos sambaquis, o que ajuda a explicar o fato, constatado neste trabalho, de as camadas mais ricas em conchas inteiras serem, na estratigrafia dos depósitos arqueológicos, mais comuns nas fácies mais basais e antigas.
Title in English
Climatic and environmental record of shellmounds and paleolagoon shells deposits of the Santa Catarina coast
Keywords in English
Anomalocardia brasiliana
Holocene
Paleolagoon
Santa Catarina
Shellmound
Abstract in English
Mollusk shells archive the climatic and environmental conditions prevailing at the time of the life of the organisms that produced them, and even after their death, in the form of taphonomic, isotopic and geochemical signatures. On the south-central coast of Santa Catarina there are two types of conchiferous deposits formed between about 8 ka and 1.5 ka cal BP, the natural or paleolagunar deposits, whose top today is about 80 cm below the surface and, the sambaquis, archaeological shellmounds up to tens of meters thick, intentionally constructed and composed predominantly of Anomalocardia brasiliana shells from adjacent lagoons. This research integrates results of facies analysis, taxonomic composition and taphonomic characterization of conchiferous deposits of both types with dating and geochemical (Mg/Ca, Sr/Ca and Ba/Ca) and isotopic (?13C and ?18O) analysis of A. brasiliana valves. These results, which cover the approximate time interval from 7 ka to 1.5 ka BP, allowed to infer that the decline in RSL since about 5.5 ka, the progressive closure of the lagoon system, which accelerated after that date, and the more or less simultaneous increase in regional precipitation diminished the average salinity of the waters of this system and, consequently, the populations of A. brasiliana, sensitive to salinities below 17. This environmental change, as well as the contraction of mollusk banks due to the lagoon siltation, has reduced the availability of their shells as a constructive material of the sambaquis, which helps to explain the fact that the richest layers of entire shells are, in the stratigraphy of archaeological deposits, more common in the more basal and older facies.
 
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Tese_Rafael_Casati.pdf (18.59 Mbytes)
Publishing Date
2019-12-11
 
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