Subduction initiation of the maksyutov eclogite-glaucophane schist complex (South Urals)

Fedkin, V.V.; Shchipansky, A.A.

Авторы: Fedkin V.V., Shchipansky A.A.
Журнал: Experiment in GeoSciences
Том: 25
Номер: 1
Год издания: 2019
Первая страница: 59
Последняя страница: 63
Аннотация: Abstract. The new geodynamic concept of the “Subduction initiation rule” (SIR) (Whattam and Stern, 2011) connects the processes of formation of collision zones of lithospheric plates with the formation of ophiolitic complexes, pre-arc basins and the processes of initiation of subduction (SI). This concept predicts that most ophiolites were formed during SI and the diagnostic chemostratigraphic progression for SIR ophiolites is from less to more HESE-depleted and LILE-enriched compositions. The Maksyutov eclogite-glaucophane high-pressure complex in the Southern Urals (MC) is a unique object for studying the phenomenon of subduction initiation. The main reason is related to the fact that along with the diagnostic magmatic chemostratigraphic sequence of SI and ophiolites, the reconstructed HP-UHP subduction channel, which is the Maksyutov complex, was also discovered here. To understand the geodynamics of the SI process, this is of paramount importance, since the time of HP-UHP metamorphism of the MC coincides with the appearance of the Magnitogorsk intra-oceanic island arc in the early Devonian. In this work, on the basis of precision XRF and ICP MS, analyzes of bulk composition of representative samples of garnet-bearing mafic rocks of the MC attempted to identify the temporal, tectonic and geochemical features (indicators) of the SI process and assess their role in the geodynamic development of the complex. The issues of the chemical composition and genesis of the protoliths of the complex, the geodynamic setting of their source, the participation in the subduction process of the mantle-plume mechanism and crustal contamination, as well as the role and importance of boninite-bearing ophiolites in the subduction initiation of are considered. Keywords: Maksyutov complex, Ural Mountains, UHP metamorphism, protolith, eclogite, subduction, XRF and ICP MS bulk-rock chemistry
Добавил в систему: Федькин Валентин Васильевич

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