Detrital zircon SHRIMP U–Pb age study of the Cordillera Darwin Metamorphic Complex of Tierra del Fuego: sedimentary sources
and implications for the evolution of the Pacific margin of Gondwana
F. Hervé
C.M. Fanning
R.J. Pankhurst
C. Mpodozis
K. Klepeis
M. Calderón
S.N. Thomson
10.6084/m9.figshare.3454808.v1
https://geolsoc.figshare.com/articles/dataset/Detrital_zircon_SHRIMP_U_Pb_age_study_of_the_Cordillera_Darwin_Metamorphic_Complex_of_Tierra_del_Fuego_sedimentary_sources___and_implications_for_the_evolution_of_the_Pacific_margin_of_Gondwana/3454808
<p>The Cordillera Darwin Metamorphic Complex in the southernmost Andes includes a basement of probable Palaeozoic age, a mid-Jurassic
and younger volcano-sedimentary cover, and a suite of Jurassic granites, all of which were jointly metamorphosed during the
Cretaceous. Detrital zircon ages presented here show that some of the amphibolite-facies metamorphic rocks previously mapped
as basement have a Jurassic protolith. Overall the detrital zircon age patterns for samples of the Cordillera Darwin basement
differ from those of the Madre de Dios Terrane of the western Patagonian Andes with which they had been correlated; instead,
they are more comparable with those from the Eastern Andes Metamorphic Complex, which apparently developed in a passive margin
setting. The paucity of Cambrian detrital zircons indicates that the meta-igneous basement of the Magallanes foreland basin
of central and northern Tierra del Fuego was not the main source of detritus for the protolith of the Cordillera Darwin Metamorphic
Complex. The possibility is envisaged that the Magallanes Fagnano transform fault boundary between the Scotia and South America
plates resulted from reactivation of an older, pre-Jurassic suture zone between the basement terranes of north–central Tierra
del Fuego and Cordillera Darwin.
</p>
2016-06-21 12:21:58
Patagonian Andes
basement terranes
South America plates
Jurassic granites
source
Tierra del Fuego
Detrital zircon ages
Dios Terrane
Cambrian detrital zircons
Palaeozoic age
Eastern Andes Metamorphic Complex
fault boundary
detrital zircon age patterns
Jurassic protolith
Magallanes foreland basin
Pacific margin
Cordillera Darwin Metamorphic Complex
Cordillera Darwin basement
Magallanes Fagnano
Cordillera Darwin
Geology