10.6084/m9.figshare.3453863.v1
Carita Augustsson
Carita
Augustsson
Tobias Rüsing
Tobias
Rüsing
Hans Niemeyer
Hans
Niemeyer
Ellen Kooijman
Ellen
Kooijman
Jasper Berndt
Jasper
Berndt
Heinrich Bahlburg
Heinrich
Bahlburg
Udo Zimmermann
Udo
Zimmermann
0.3 byr of drainage stability along the Palaeozoic palaeo-Pacific Gondwana margin; a detrital zircon study
Geological Society of London
2016
zircon data
Gondwana
age clusters
detrital mineral ages
growth phase
transport system
terrane accretion
drainage stability
Silurian sandstone units
magmatic zircon
zircon ages
Ordovician Famatinian arc
transport barrier
Cathodoluminescence images
provenance data
Silurian deposits
Famatinian arc
Palaeozoic era
Cambrian units
zircon grains
Palaeozoic time
tectonic activity
Famatinian orogenies
geomorphological features
detrital zircon study
Geology
2016-06-21 11:43:51
Dataset
https://geolsoc.figshare.com/articles/dataset/0_3_byr_of_drainage_stability_along_the_Palaeozoic_palaeo-Pacific_Gondwana_margin_a_detrital_zircon_study/3453863
<p>The palaeo-Pacific margin of Gondwana in the present-day south–central Andes is marked by tectonic activity related to subduction
and terrane accretion. We present detrital zircon U–Pb data encompassing the Palaeozoic era in northern Chile and northwestern
Argentina. Cathodoluminescence images reveal dominantly magmatic zircon barely affected by abrasion and displaying only one
growth phase. The main age clusters for these zircon grains are Ediacaran to Palaeozoic with an additional peak at 1.3–0.9 Ga
and they can be correlated with ‘Grenvillian’ age, and the Brasiliano, Pampean, and Famatinian orogenies. The zircon data
reveal main transport from the nearby Ordovician Famatinian arc and related rocks. The Silurian sandstone units are more comparable
with Cambrian units, with Brasiliano and Transamazonian ages (2.2–1.9 Ga) being more common, because the Silurian deposits
were situated within or east of the (extinct) Famatinian arc. Hence, the arc acted as a transport barrier throughout Palaeozoic
time. The complete suite of zircon ages does not record the accretions of exotic terranes or the Palaeozoic glacial periods.
We conclude that the transport system along the palaeo-Pacific margin of Gondwana remained stable for <em>c</em>. 0.3 byr and that provenance data do not necessarily reflect the interior of a continent. Hence, inherited geomorphological
features must be taken into account when detrital mineral ages are interpreted.
</p>