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- W2889623241 abstract "The Eocene Gatuncillo, Tonosi´ and Cobacho´n formations constitute the oldestknown Cenozoic sedimentary successions in Central Panama and the AzueroPeninsula. New detrital zircon U-Pb ages and detrital apatite helium cooling agesobtained in these formations, combined with previous and unpublishedgeochronological and thermochronological studies in igneous and sedimentary rocks,suggest a sequence of four exhumation episodes of the Panamanian VolcaniclasticBasement Complex. These events occurred at (1) 47 - 42 Ma, (2) 32 - 28 Ma, (3) 22 -15 Ma and (4) 9 - 0 Ma; and are related to the tectonic interaction between thePanamanian Arc with the Farallon and South American plates and the GorgonaPlateau. The episodes were associated with emergence of land areas based on thepresence of unroofed and volcanic zircons deposited in the sedimentary formationssince the middle Eocene until the late Miocene. Lu-Hf isotopic data from detrital and intrusive zirconsreveal EHf values between +3 and+16, suggesting an island arc origin for the Panamanian Basement Complex. ( en )" @default.
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- W2889623241 date "2013-01-01" @default.
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- W2889623241 title "Origin, Provenance and Exhumation of Gatuncillo, Tonosi and Cobachon Formations Implications for the Tectonic Evolution of the Isthmus of Panama" @default.
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