TY - JOUR

T1 - Petrology and geochemistry of the late Mesozoic Dzheltula alkaline igneous complex, Aldan–Stanovoy Shield, Russia

T2 - constraints on derivation from the ancient enriched mantle source

AU - Doroshkevich, Anna G.

AU - Prokopyev, Ilya R.

AU - Ponomarchuk, Anton

AU - Savatenkov, Valery M.

AU - Kravchenko, Aleksandr A.

AU - Ivanov, Aleksey I.

AU - Wohlgemuth-Ueberwasse, Cora

N1 - Publisher Copyright: © 2020, Geologische Vereinigung e.V. (GV). Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/10/1

Y1 - 2020/10/1

N2 - Petrological, whole-rock major and trace element, and Sr–Nd–Pb isotopic data are reported for the late Mesozoic Dzheltula alkaline igneous complex in the Aldan–Stanovoy Shield, Russia. The alkaline rocks are emplaced into the Tyrkanda mélange zone. The Dzheltula complex consists of monzonites, foid monzonites, and alkaline syenites; granite dykes intrude the complex. All alkaline rocks have high LILE contents (e.g., Ba and Sr), high light REE/HFSE ratios, strongly fractionated REE patterns, and typically lack Eu anomalies. Granite shows different major and trace-element characteristics in comparison to monzonites and syenites. The major and trace-element characteristics of the Dzheltula complex rocks and minerals are consistent with formation by combined assimilation and fractionation processes of an alkaline parental magma of lamproitic composition. The alkaline rocks have moderately radiogenic Sr (87Sr/86Sr(t) = 0.7057–0.7065) and unradiogenic Nd (ɛNd(t) = − 11.3 to − 15.2) and Pb (206Pb/204Pb = 17.17–17.26); granite has more enriched 87Sr/86Sr(t) value (0.707408) but similar ɛNd(t) = − 12.93 The trace element and Sr–Nd–Pb isotopic data for the Dzheltula complex indicate its mantle source experienced ancient metasomatic enrichment, probably associated with subduction.

AB - Petrological, whole-rock major and trace element, and Sr–Nd–Pb isotopic data are reported for the late Mesozoic Dzheltula alkaline igneous complex in the Aldan–Stanovoy Shield, Russia. The alkaline rocks are emplaced into the Tyrkanda mélange zone. The Dzheltula complex consists of monzonites, foid monzonites, and alkaline syenites; granite dykes intrude the complex. All alkaline rocks have high LILE contents (e.g., Ba and Sr), high light REE/HFSE ratios, strongly fractionated REE patterns, and typically lack Eu anomalies. Granite shows different major and trace-element characteristics in comparison to monzonites and syenites. The major and trace-element characteristics of the Dzheltula complex rocks and minerals are consistent with formation by combined assimilation and fractionation processes of an alkaline parental magma of lamproitic composition. The alkaline rocks have moderately radiogenic Sr (87Sr/86Sr(t) = 0.7057–0.7065) and unradiogenic Nd (ɛNd(t) = − 11.3 to − 15.2) and Pb (206Pb/204Pb = 17.17–17.26); granite has more enriched 87Sr/86Sr(t) value (0.707408) but similar ɛNd(t) = − 12.93 The trace element and Sr–Nd–Pb isotopic data for the Dzheltula complex indicate its mantle source experienced ancient metasomatic enrichment, probably associated with subduction.

KW - Assimilation

KW - Foid monzonite–syenite suite

KW - Fractionation

KW - Isotope geochemistry

KW - Late mesozoic potassic magmatism

KW - Mantle source

KW - Primary melt

KW - CRYSTALLIZATION

KW - ROCKS

KW - SIBERIA

KW - LAMPROITES

KW - Foid monzonite-syenite suite

KW - TRACE-ELEMENT

KW - DISCRIMINATION

KW - ND

KW - MINERALIZATION

KW - MASSIF CENTRAL-ALDAN

KW - ISOTOPIC COMPOSITION

UR - http://www.scopus.com/inward/record.url?scp=85088311974&partnerID=8YFLogxK

U2 - 10.1007/s00531-020-01909-6

DO - 10.1007/s00531-020-01909-6

M3 - Article

AN - SCOPUS:85088311974

VL - 109

SP - 2407

EP - 2423

JO - International Journal of Earth Sciences

JF - International Journal of Earth Sciences

SN - 1437-3254

IS - 7

ER -