SHRIMP U-Pb zircon dating of Pedras Grandes Suite, southern Santa Catarina State, Brazil

Anais da Academia Brasileira de Ciências

Andréa R. Jelinek²  Artur C. Bastos-neto²  Jayme A.d. Leite¹  Léo A. Hartmann²  Neal J. Mcnaughton¹ 

[1] ,Universidade Federal do Rio Grande do Sul Instituto de Geociências Porto Alegre RS ,Brasil

关键词: SHRIMP;    Pedras Grandes Suite;    zircon;    geochronology;    fluorite;    SHRIMP;    Suite Pedras Grandes;    zircão;    geocronologia;    fluorita;   

DOI  :  10.1590/S0001-37652005000100010

来源: SciELO

【 摘 要 】

Two major magmatic pulses of the granitic Florianópolis Batholith in Santa Catarina State, southern Brazil, occurred between 613±5Ma and 595±5 Ma, during the Neoproterozoic Brasiliano Cycle. These ages were obtained by U-Pb isotopic determinations with the sensitive high mass-resolution ion microprobe on igneous zircons from Pedras Grandes Suite in Santa Catarina State. Euhedral zircons remained unaltered close to a fluorite vein deposited at 180?C or more. These ages suggest a northern limit for the Pedras Grandes Suite, explaining the spatial relationship between the fluorite veins and the source rock.

【 授权许可】

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