Strontium isotopic composition from Northeast Patagonia: Preliminary results
We have carried out measurements of strontium isotopic compositions of carbonate units from northeastern Patagonia. The rock units included in the study are: a) Pailemán marble, with questionable belonging to El Jagüelito Formation, and mean87Sr/86Sr value of 0,707354 ± 0,000113; b) marbles from est...
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| Autores principales: | , , , , , , |
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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00044822_v71_n4_p_Varela |
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| Sumario: | We have carried out measurements of strontium isotopic compositions of carbonate units from northeastern Patagonia. The rock units included in the study are: a) Pailemán marble, with questionable belonging to El Jagüelito Formation, and mean87Sr/86Sr value of 0,707354 ± 0,000113; b) marbles from estancia La Auriciana, Mina Gonzalito Complex, with mean87Sr/86Sr value of 0,708730 ± 0,000285; c) archaeocyathan limestone clasts from a metaconglomerate layer of El Jagüelito Formation in the Sierra Grande area, with mean87Sr/86Sr value of 0,710605 ± 0,000118. Comparison of these data with the global87Sr/86Sr evolution curve suggests that the Pailemán marble is the oldest (ca. 625 Ma), followed by the estancia La Auriciana marbles (ca. 550-510 Ma), while the archeocyathan limestone clasts from Sierra Grande area are Cambrian. © 2014, Asociacion Geologica Argentina. All rights reserved. |
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