TY - JOUR

T1 - Petrology of alkaline silicate rocks and carbonatites of the Chuktukon massif, Chadobets upland, Russia

T2 - Sources, evolution and relation to the Triassic Siberian LIP

AU - Doroshkevich, Anna G.

AU - Chebotarev, Dmitry A.

AU - Sharygin, Victor V.

AU - Prokopyev, Ilya R.

AU - Nikolenko, Anna M.

N1 - Publisher Copyright: © 2019

PY - 2019/5/1

Y1 - 2019/5/1

N2 - The petrogenesis of temporally and spatially associated carbonatitic and deeply derived carbonated alkaline silicate magmas provides an opportunity to gain insights into the nature of the deepest lithospheric mantle. The Chuktukon massif, which is part of the Chadobets alkaline ultramafic carbonatite complex (Chadobets upland, Siberian craton) is a carbonatite-melilitite-damtjernite intrusion, whose emplacement was coeval with the Siberian Traps large igneous province (LIP). In this study, the sources of the primary melts are examined, the petrogenetic evolution of the complex is reconstructed and the relationship with the Siberian LIP is also discussed. Isotopic and geochemical information indicate that the source for the Chuktukon primary melts was isotopically moderately depleted and the primary melts were formed by low degree partial melting of garnet carbonated peridotite. Hydrothermal processes caused 18 O- and 13 C- enrichment. The weathering process was accompanied by trace element re-distribution and enrichment of the weathering crust in Zn, Th, U, Nb, Pb and REE, relative to the Chuktukon rocks and a change in radiogenic (Sr, Nd) isotope compositions.

AB - The petrogenesis of temporally and spatially associated carbonatitic and deeply derived carbonated alkaline silicate magmas provides an opportunity to gain insights into the nature of the deepest lithospheric mantle. The Chuktukon massif, which is part of the Chadobets alkaline ultramafic carbonatite complex (Chadobets upland, Siberian craton) is a carbonatite-melilitite-damtjernite intrusion, whose emplacement was coeval with the Siberian Traps large igneous province (LIP). In this study, the sources of the primary melts are examined, the petrogenetic evolution of the complex is reconstructed and the relationship with the Siberian LIP is also discussed. Isotopic and geochemical information indicate that the source for the Chuktukon primary melts was isotopically moderately depleted and the primary melts were formed by low degree partial melting of garnet carbonated peridotite. Hydrothermal processes caused 18 O- and 13 C- enrichment. The weathering process was accompanied by trace element re-distribution and enrichment of the weathering crust in Zn, Th, U, Nb, Pb and REE, relative to the Chuktukon rocks and a change in radiogenic (Sr, Nd) isotope compositions.

KW - Carbonatites

KW - Chadobets upland

KW - Damtjernites

KW - Melilitites

KW - Source characteristics

KW - Triassic Siberian LIP

KW - LIQUID IMMISCIBILITY

KW - IGNEOUS PROVINCE EVIDENCE

KW - FLOOD BASALTS

KW - NORTH TRANSBAIKALIA

KW - TRACE-ELEMENT

KW - DOLOMITE CARBONATITE

KW - MELT INCLUSIONS

KW - ISOTOPIC COMPOSITIONS

KW - GULI MASSIF

KW - OLDOINYO LENGAI VOLCANO

UR - http://www.scopus.com/inward/record.url?scp=85062822336&partnerID=8YFLogxK

U2 - 10.1016/j.lithos.2019.03.006

DO - 10.1016/j.lithos.2019.03.006

M3 - Article

AN - SCOPUS:85062822336

VL - 332-333

SP - 245

EP - 260

JO - Lithos

JF - Lithos

SN - 0024-4937

ER -