A Timanian foreland basin setting for the late Neoproterozoic–Early Palaeozoic cover sequences (Dividal Group) of northeastern
Baltica
Arild Andresen
Nana Yaw Agyei-Dwarko
Magnus Kristoffersen
Nils-Martin Hanken
10.6084/m9.figshare.3453677.v1
https://geolsoc.figshare.com/articles/dataset/A_Timanian_foreland_basin_setting_for_the_late_Neoproterozoic_Early_Palaeozoic_cover_sequences_Dividal_Group_of_northeastern___Baltica/3453677
<p>LA-ICP-MS U–Pb and Hf-isotope data on detrital zircons from the Ediacaran and Cambrian Dividal Group demonstrate that the
autochthonous cover sequence above the Fennoscandian Shield in northernmost Scandinavia is not derived from an easterly Archaean
and Palaeoproterozoic source within Baltica as commonly thought. Detrital zircon age populations on four samples from the
Dividal Group are dominated by Mesoproterozoic zircons with relatively few Palaeoproterozoic and Archaean zircons. Two samples,
from Altevann and Reisadalen have, in addition, a significant population of Ediacaran zircons (<em>c.</em> 570–560 Ma), indicating a Timanian source area for most of the lower Cambrian Dividal Group sediments. The <sup>176</sup>Hf/<sup>177</sup>Hf isotope data show the Ediacaran zircons to be derived from two separate plutonic complexes within the Timanides. It is
argued that the Dividal Group sediments were deposited in a foreland basin south and SW of the Timanide Orogen. Similarities
with clastic zircon age populations from Cambrian deposits in Akkajaure, Ladoga/White Sea and St Petersburg areas indicate
that this foreland basin possibly extended southward for at least 1000 km. A foreland basin setting for the Ediacaran and
Cambrian deposits in Central and Southern Scandinavia can thus account for the enigmatic Neoproterozoic detrital zircons in
these deposits.
</p>
2016-06-21 11:36:18
St Petersburg areas
Dividal Group
Cambrian Dividal Group sediments
Ediacaran zircons
Neoproterozoic detrital zircons
Cambrian Dividal Group
Cambrian deposits
Detrital zircon age populations
Timanian foreland basin
clastic zircon age populations
Dividal Group sediments
Timanian source area
SW
foreland basin
Geology