Geochemical Features and Geodynamic Settings of the Formation of Cretaceous Terrigenous Rocks of the West Sakhalin Terrane

Geochemical Features and Geodynamic Settings of the Formation of Cretaceous Terrigenous Rocks of... The geochemical composition of Cretaceous terrigenous rocks of the West Sakhalin terrane is analyzed and their paleogeodynamic interpretation is suggested. It is revealed that the rocks are characterized by the low maturity of clastic material. They contain fragments of both volcanomictic and sialic material and in composition correspond to graywackes, being petrogenic or “first cycle” rocks. The geochemical data were generalized and interpreted on the basis of their comparison with compositions of the present-day and ancient rocks formed in known geodynamic settings. The obtained results indicate that terrigenous rocks of the terrane were formed in a pull-apart basin at an active continental margin. The source area, which supplied clastic material in this sedimentation basin during the Berriasian–Danian, included a sialic land made up of granite-metamorphic and sedimentary rocks and the mature (deeply dissected) ensialic Moneron–Samarga island arc, which was accreted to the continental margin at the moment of basin initiation. Sediments were accumulated in general along the continent–ocean boundary against the background of large-scale sinistral transform strike-slip movements of the Izanagi Plate relative to the Eurasian continent. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Lithology and Mineral Resources Springer Journals

Geochemical Features and Geodynamic Settings of the Formation of Cretaceous Terrigenous Rocks of the West Sakhalin Terrane

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Publisher
Pleiades Publishing
Copyright
Copyright © 2018 by Pleiades Publishing, Inc.
Subject
Earth Sciences; Mineral Resources; Mineralogy; Sedimentology
ISSN
0024-4902
eISSN
1608-3229
D.O.I.
10.1134/S0024490218010066
Publisher site
See Article on Publisher Site

Abstract

The geochemical composition of Cretaceous terrigenous rocks of the West Sakhalin terrane is analyzed and their paleogeodynamic interpretation is suggested. It is revealed that the rocks are characterized by the low maturity of clastic material. They contain fragments of both volcanomictic and sialic material and in composition correspond to graywackes, being petrogenic or “first cycle” rocks. The geochemical data were generalized and interpreted on the basis of their comparison with compositions of the present-day and ancient rocks formed in known geodynamic settings. The obtained results indicate that terrigenous rocks of the terrane were formed in a pull-apart basin at an active continental margin. The source area, which supplied clastic material in this sedimentation basin during the Berriasian–Danian, included a sialic land made up of granite-metamorphic and sedimentary rocks and the mature (deeply dissected) ensialic Moneron–Samarga island arc, which was accreted to the continental margin at the moment of basin initiation. Sediments were accumulated in general along the continent–ocean boundary against the background of large-scale sinistral transform strike-slip movements of the Izanagi Plate relative to the Eurasian continent.

Journal

Lithology and Mineral ResourcesSpringer Journals

Published: Mar 14, 2018

References

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