Results 11 to 20 of about 16,578 (144)

Petrology of ultramafic lamprophyres from the Beaver Lake area of Eastern Antarctica and their relation to the breakup of Gondwanaland [PDF]

Mineralogy and Petrology, 2002
Mesozoic melilite-bearing ultramafic lamprophyres are developed as sill, dyke and plug-like intrusive bodies in the East Antarctic Beaver Lake area. They consist of varying amounts of olivine, melilite, phlogopite, nepheline, titanomagnetite and perovskite as major phases, accompanied by minor amounts of apatite, carbonate, spinel, glass and, rarely ...
Foley, S., Andronikov, A., Melzer, S.
openaire   +4 more sources

MELT INCLUSIONS IN OLIVINE AS A SOURCE OF INFORMATION ON THE COMPOSITION AND EVOLUTION OF DEEP MELTS OF AILLIKITES (ULTRAMAFIC LAMPROPHYRES) OF THE ILBOKICHI UPLIFT, THE SW SIBERIAN PLATFORM

Геодинамика и тектонофизика, 2022
Aillikites are kimberlite-like rocks, important for understanding the composition and processes occurring in the mantle. Melt inclusions represent a reliable source of information.
A. Е. Starikova, I. R. Prokopyev, A. G. Doroshkevich, A. V. Kargin, A. A. Nosova, S. A. Kovalev   +5 more
doaj   +1 more source

Mapping a hidden terrane boundary in the mantle lithosphere with lamprophyres. [PDF]

Nat Commun, 2018
Lamprophyres represent hydrous alkaline mantle melts that are a unique source of information about the composition of continental lithosphere. Throughout southwest Britain, post-Variscan lamprophyres are (ultra)potassic with strong incompatible element ...
Dijkstra AH, Hatch C.
europepmc   +2 more sources

GEOCHRONOLOGY OF THE CHADOBETS ALKALINE ULTRAMAFIC CARBONATITE COMPLEX (SIBERIAN CRATON): NEW U-Pb AND Ar-Ar DATA

Геодинамика и тектонофизика, 2021
The Chadobets alkaline ultramafic carbonatite complex is located on the Siberian craton within the southern boundary of the Permian-Triassic plume activity.
I. R. Prokopyev, A. G. Doroshkevich, A. V. Malyutina, A. E. Starikova, A. V. Ponomarchuk, D. V. Semenova, S. A. Kovalev, I. A. Savinsky   +7 more
doaj   +1 more source

Geodynamic and Isotopic Constraints on the Genesis of Kimberlites, Lamproites and Related Magmas From the Finnish Segment of the Karelian Craton

Geochemistry, Geophysics, Geosystems, 2022
Despite the scientific and economic significance of kimberlites and related magmas, their origin is unclear. Here, we address this issue using whole‐rock and perovskite‐derived Sr‐Nd‐Hf isotopes for the three occurrences of kimberlite, lamproites and ...
Hayden Dalton, Andrea Giuliani, Janet Hergt, David Phillips, Hugh O’Brien, Maxim D. Ballmer, Roland Maas, Jon Woodhead   +7 more
doaj   +1 more source

Mesozoic magmatic evolution of the Laiyuan complex: Tracing the crust-mantle and lithosphere-asthenosphere interactions in the central North China Craton

Frontiers in Earth Science, 2023
The Laiyuan complex in the central North China Craton (NCC) incorporating different magmatic suites offers an excellent opportunity to investigate the lithospheric evolution and cratonic destruction. However, the petrogenesis and tectonic implications of
Fei Xue, M. Santosh, M. Santosh, Toshiaki Tsunogae, Fan Yang, Hongbing Tan, Guohui Chen, Chao Li, Yunchou Xu   +8 more
doaj   +1 more source

Integrating Ultramafic Lamprophyres into the IUGS Classification of Igneous Rocks: Rationale and Implications [PDF]

Journal of Petrology, 2005
RECEIVED JULY 16, 2004; ACCEPTED MARCH 16, 2005ADVANCE ACCESS PUBLICATION APRIL 29, 2005We introduce a modification to the current IUGS classificationsystem for igneous rocks to include ultramafic lamprophyres, whicharecurrentlyentirelyomitted.Thisisdonebyincludinganewstepinthe sequential system, after the assignment of pyroclastic rocks ...
SEBASTIAN TAPPE, STEPHEN F. FOLEY, GEORGE A. JENNER, BRUCE A. KJARSGAARD   +3 more
openaire   +1 more source

Petrogenetic processes in the ultramafic, alkaline and carbonatitic magmatism in the Kola Alkaline Province: a review [PDF]

, 2005
Igneous rocks of the Devonian Kola Alkaline Carbonatite Province (KACP) in NW Russia and eastern Finland can be classified into four groups: (a) primitive mantle-derived silica-undersaturated silicate magmas; (b) evolved alkaline and nepheline syenites; (
Balaganskaya, Elena, Demaiffe, Daniel, Beard, Andrew D., Demaiffe, D., Beard, Andrew, Downes, Hilary, Balaganskaya, E., Beard, Andy, Liferovich, R., Liferovich, Ruslan   +9 more
core   +1 more source

KIMBERLITE-LIKE ROCKS OF THE URIK-IYA GRABEN, EASTERN SAYAN REGION: MINERAL COMPOSITION, GEOCHEMISTRY AND FORMATION CONDITIONS

Геодинамика и тектонофизика, 2020
The study of the Bol’shaya Tagna alkaline-carbonatite massif and adjacent areas was focused on the mineral and chemical compositions of minerals, the distribution of petrogenic and trace elements in pyroxene-free alkaline picrites in veins and dikes ...
V. B. Savel'eva, Yu. V. Danilova, E. P. Bazarova, B. S. Danilov   +3 more
doaj   +1 more source

Filling the Gap in the Classification of Phlogopite-Bearing Ultramafic Rocks [PDF]

, 2018
In recent years, the many new occurrences reported in the literature of ultramafic rocks that have phlogopite as a major constituent and do not fall into the categories of kimberlites, lamproites, and lamprophyres have highlighted the need for a ...
FREDDO, IVAN, Maurizio Mazzucchelli, Giovanardi, Tommaso, Mazzucchelli, Maurizio, Tommaso Giovanardi, Ivan Freddo   +5 more
core   +1 more source