Tithonian age of dinosaur fossils in central Patagonian, Chile: U–Pb SHRIMP geochronology

Abstract

Three Tithonian concordant U–Pb SHRIMP zircon ages of 148.7 ± 1.4, 147.9 ± 1.5 and 147.0 ± 1.0 from tuffs intercalated in a clastic sedimentary succession with exceptional dinosaur bones including the new taxon Chilesaurus diegosuarezi gen. et sp. nov. exposed in central Chilean Patagonia (ca. 46°30′S) are reported herein. The fossiliferous beds accumulated in a synvolcanic fan delta reaching a shallow marine basin as indicated by glauconite present in some of the beds, and coeval with the beginning of the transgression of the Aysén Basin.

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Acknowledgments

This work was financed by FONDECYT Projects No. 1121140 (and initiated with FONDECYT projects Nos. 1030162 and 1080516), the Universidad Andres Bello and the Servicio Nacional de Geología y Minería. We acknowledge the curiosity, good sight and capacity of Diego Suárez who at the age of 7 independently discovered the dinosaur fossils, and the assistance of Leonardo Zúñiga, Alvaro Saldivia and Heliberto Leichtle.

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Correspondence to Manuel Suárez.

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Suárez, M., De La Cruz, R., Fanning, M. et al. Tithonian age of dinosaur fossils in central Patagonian, Chile: U–Pb SHRIMP geochronology. Int J Earth Sci (Geol Rundsch) 105, 2273–2284 (2016). https://doi.org/10.1007/s00531-015-1287-7

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Keywords

  • U–Pb
  • Tithonian
  • Dinosaurs
  • Chilesaurus diegosuarezi gen. et sp. nov.
  • Patagonia
  • Chile