Geochemical similarity of Cambrian alkaline and subalkaline magmatism (Kuznetsk Alatau Orogen, Siberia): a new data synthesis | Geosphere Research. 2022. № 3. DOI: 10.17223/25421379/24/2

Geochemical similarity of Cambrian alkaline and subalkaline magmatism (Kuznetsk Alatau Orogen, Siberia): a new data synthesis

This is a synthesis of recent geochemical evidence from Cambrian granitic, gabbro-monzonitic, and few small gabbro-foidolitic intrusions in the Early Paleozoic Kuznetsk Alatau orogen (western Central Asian Orogenic Belt, Siberia). Their origin is attributed to late- and post-orogenic regional magmatism which produced different rock types sharing basic similarity in isotope systematics and trace-element compositions. The e_Nd(t) values of ~2 to 8.7 in main igneous lithologies record the extent of interaction between depleted and enriched mantle. Concurrent increase of initial ⁸⁷Sr/⁸⁶Sr (0.7039-0.7058) ratios and 3¹⁸О values (6.5-13 %o) in rocks and minerals, as well as ²⁰⁷Pb enrichment (²⁰⁷Pb/²⁰⁴Pb(t) = 15.5-15.7), indicate crustal contamination of mantle melts. Trace-element patterns in the rocks correspond to a mixed IAB + OIB source. The alkaline and subalkaline rocks of the Kuznetsk Alatau area share trace element and isotopic similarity and apparently emplaced almost synchronously late during a regional-scale tectonic event. The synthesized data show that Cambrian magmatism in the area involved mixed mantle and continental crust melt components and acted in a complex tectonic setting of the former active margin of the Paleo-Asian Ocean impacted by a mantle plume.

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Keywords

Cambrian magmatism, trace-element and isotope geochemistry, mantle plume, continental margin, Paleo-Asian Ocean, Kuznetsk Alatau orogen

Authors

Name	Organization	E-mail
Vrublevskii Vassily V.	National Research Tomsk State University	vasvr@yandex.ru

Всего: 1

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