TY - JOUR

T1 - Petrogenesis of ultramafic lamprophyres from the terina complex (Chadobets upland, Russia)

T2 - Mineralogy and melt inclusion composition

AU - Prokopyev, Ilya

AU - Starikova, Anastasiya

AU - Doroshkevich, Anna

AU - Nugumanova, Yazgul

AU - Potapov, Vladislav

N1 - Publisher Copyright: © 2020 by the authors. Licensee MDPI, Basel, Switzerland. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/5/8

Y1 - 2020/5/8

N2 - The mineral composition and melt inclusions of ultramafic lamprophyres of the Terina complex were investigated. The rocks identified were aillikites, mela-aillikites, and damtjernites, and they were originally composed of olivine macrocrysts and phenocrysts, as well as phlogopite phenocrysts in carbonate groundmass, containing phlogopite, clinopyroxene and feldspars. Minor and accessory minerals were fluorapatite, ilmenite, rutile, titanite, and sulphides. Secondary minerals identified were quartz, calcite, dolomite, serpentine, chlorite, rutile, barite, synchysite-(Ce), and monazite-(Ce). Phlogopite, calcite, clinopyroxene, Ca-amphibole, fluorapatite, magnetite, and ilmenite occurred as daughter-phases in melt inclusions. The melt inclusions also contained Fe–Ni sulphides, synchysite-(Ce) and, probably, anhydrite. The olivine macrocrysts included orthopyroxene and ilmenite, and the olivine phenocrysts included Cr-spinel and Ti-magnetite inclusions. Crystal-fluid inclusions in fluorapatite from damtjernites contain calcite, clinopyroxene, dolomite, and barite. The data that were obtained confirm that the ultramafic lamprophyres of the Terina complex crystallized from peridotite mantle-derived carbonated melts and they have not undergone significant fractional crystallization. The investigated rocks are considered to be representative of melts that are derived from carbonate-rich mantle beneath the Siberian craton.

AB - The mineral composition and melt inclusions of ultramafic lamprophyres of the Terina complex were investigated. The rocks identified were aillikites, mela-aillikites, and damtjernites, and they were originally composed of olivine macrocrysts and phenocrysts, as well as phlogopite phenocrysts in carbonate groundmass, containing phlogopite, clinopyroxene and feldspars. Minor and accessory minerals were fluorapatite, ilmenite, rutile, titanite, and sulphides. Secondary minerals identified were quartz, calcite, dolomite, serpentine, chlorite, rutile, barite, synchysite-(Ce), and monazite-(Ce). Phlogopite, calcite, clinopyroxene, Ca-amphibole, fluorapatite, magnetite, and ilmenite occurred as daughter-phases in melt inclusions. The melt inclusions also contained Fe–Ni sulphides, synchysite-(Ce) and, probably, anhydrite. The olivine macrocrysts included orthopyroxene and ilmenite, and the olivine phenocrysts included Cr-spinel and Ti-magnetite inclusions. Crystal-fluid inclusions in fluorapatite from damtjernites contain calcite, clinopyroxene, dolomite, and barite. The data that were obtained confirm that the ultramafic lamprophyres of the Terina complex crystallized from peridotite mantle-derived carbonated melts and they have not undergone significant fractional crystallization. The investigated rocks are considered to be representative of melts that are derived from carbonate-rich mantle beneath the Siberian craton.

KW - Aillikite

KW - Damtjernite

KW - Melt inclusion

KW - Siberian Craton

KW - Ultramafic lamprophyre

KW - ultramafic lamprophyre

KW - IGNEOUS ROCKS

KW - damtjernite

KW - NEPHELINE SYENITES

KW - LITHOSPHERIC MANTLE

KW - CHUKTUKON CARBONATITE MASSIF

KW - UNALTERED KIMBERLITES

KW - SOUTH GREENLAND

KW - MAYMECHA-KOTUY

KW - TRACE-ELEMENTS

KW - melt inclusion

KW - UDACHNAYA-EAST PIPE

KW - GULI MASSIF

KW - aillikite

UR - http://www.scopus.com/inward/record.url?scp=85084518145&partnerID=8YFLogxK

U2 - 10.3390/min10050419

DO - 10.3390/min10050419

M3 - Article

AN - SCOPUS:85084518145

VL - 10

JO - Minerals

JF - Minerals

SN - 2075-163X

IS - 5

M1 - 419

ER -