View Item 

Palaeoproterozoic to Eoarchaean crustal growth in southern Siberia: a Nd-isotope synthesis

Access Status
Open access
Authors
Gladkochub, D.
Donskaya, T.
Reddy, Steven
Poller, U.
Bayanova, T.
Mazukabzov, A.
Dril, S.
Todt, W.
Pisarevsky, S.
Date
2009
Type
Book Chapter

Metadata
Show full item record
Citation
Gladkochub, Dmitry P. and Donskaya, Tatiana V. and Reddy, Steven M. and Poller, Ulrike and Bayanova, Tamara B. and Mazukabzov, Anatoliy M. and Dril, Sergei and Todt, Wolfgang and Pisarevsky, Sergei A. 2009. Palaeoproterozoic to Eoarchaean crustal growth in southern Siberia: a Nd-isotope synthesis, in Reddy, S.M., Mazumder, R., Evans, D.A.D, & Collins, A.S. (ed), Palaeoproterozoic supercontinents and global evolution. pp. 127-144. London, UK: Geological Society, London.
Source Title
Palaeoproterozoic supercontinents and global evolution
DOI
ISBN
Faculty
Department of Applied Geology
Faculty of Science and Engineering
WA School of Mines
Remarks

Accepted for publication in Palaeoproterozoic supercontinents and global evolution as of 2009.

URI
Collection
Abstract

Nd-isotope analyses from 114 rock samples are reported from the southern part of the Siberian craton to establish a first-order crustal formation scheme for the region. The Nd-isotopedata show considerable variability within and among different cratonic units. In many cases this variability reflects differing degrees of mixing between juvenile and older (up to Eoarchaean) crustal components. The fragments of Palaeoproterozoic juvenile crust within the studied segment of the Siberian craton margin have Nd-model ages of 2.0-2.3 Ga. Voluminous Palaeoproterozoicgranites ( 1.85 Ga) were intruded into cratonic fragments and suture zones. These granites mark the stabilization of the southern Siberian craton. The complexity in the Nd data indicatea long history of crustal development, extending from the Eoarchaean to the Palaeoproterozoiceras, which is interpreted to reflect the amalgamation of distinct Archaean crustal fragments, with differing histories, during Palaeoproterozoic accretion at 1.9-2.0 Ga and subsequent cratonic stabilization at 1.85 Ga. Such a model temporally coincides with important orogenic events on nearly every continent and suggests that the Siberian craton participated in the formation of a Palaeoproterozoic supercontinent at around 1.9 Ga.