10.6084/m9.figshare.3454622.v1
V. Pease
V.
Pease
R.A. Scott
R.A.
Scott
Crustal affinities in the Arctic Uralides, northern Russia: significance of detrital zircon ages from Neoproterozoic and Palaeozoic
sediments in Novaya Zemlya and Taimyr
Geological Society of London
2016
peak Timanian event
timing
Novaya Zemlya
Taimyr
North Kara block
Baltica
Ma
detrital zircon ages
Palaeozoic
probability age peaks
unconformity
Geology
2016-06-21 12:14:52
Dataset
https://geolsoc.figshare.com/articles/dataset/Crustal_affinities_in_the_Arctic_Uralides_northern_Russia_significance_of_detrital_zircon_ages_from_Neoproterozoic_and_Palaeozoic___sediments_in_Novaya_Zemlya_and_Taimyr/3454622
<p>U–Pb ion microprobe detrital zircon provenance investigations of pre-Mesozoic sediment samples from southern Novaya Zemlya
and northern Taimyr, Arctic Russia, provide new constraints on the tectonic evolution of northern Eurasia. Sediments from
both areas previously assigned a Neoproterozoic age are shown to be Palaeozoic (≤500 Ma), changing our understanding of the
timing of tectonic events and their regional correlation. Samples from Novaya Zemlya provide an <em>a priori</em> Baltica signature, and dominant cumulative probability age peaks between 610 and 530 Ma are consistent with derivation from
Timanide sources. Samples from northern Taimyr also contain the unique Timanian ’fingerprint' and are also inferred to be
derived from the continental slope of northeastern Baltica, implying that the North Kara block was a part of Baltica in the
early Palaeozoic. These data constrain the timing of deformation, metamorphism and development of an unconformity in southern
Novaya Zemlya to a restricted period no earlier than late Cambrian–early Ordovician and at least 50 Ma after the peak Timanian
event. The unconformity on Novaya Zemlya can be correlated in style and timing with an unconformity on Severnaya Zemlya and
may record post-Timanian extensional collapse and onset of spreading in the Uralian Ocean.
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