Results 61 to 70 of about 147 (81)

Ultramafic Xenoliths From Aillikites in the Tarim Large Igneous Province: Implications for Alaskan-Type Affinity and Role of Subduction

Lithos, 2021
Abstract The Tarim large igneous province (TLIP) located in northwestern China is characterized by a relatively long duration of magmatism and complex lithology as compared to other global LIPs. Previous studies correlated these features to the interaction between mantle plume and subducted slab. However, no direct subduction-related magmatic records
Santosh M, Zhiguo Cheng, Zhaochong Zhang
exaly   +2 more sources

U–PB (ID-TIMS) AGE OF GARNET FROM AILLIKITES OF KOLA ALKALINE PROVINCE

Доклады Российской академии наук. Науки о Земле, 2023
U–Pb (ID-TIMS) geochronological studies of garnet from aillikites of the Kandalaksha dyke swarm (Kola alkaline province) were carried out. The obtained estimate of the U–Pb age of the garnet (374 ± 3 MA) coincides with the interval (373–377 MA) of the main stage of alkaline magmatism of the Kola province (LIP).
M. V. Stifeeva, E. B. Salnikova, A. A. Nosova, A. B. Kotov, A. A. Vozniak, D. A. Dimitrova   +5 more
openaire   +1 more source

The C and O isotopes in calcites from aillikites and carbonatites of the Beloziminsky and Tomtor massifs (Siberia, Russia)

2021
<p>The BelayaZima (645-622 Ma) (Ashchepkov et al., 2020) and Tomtor 700 and ~400 Ma) (Vladykin et al., 2016) ultrabasic alkaline rocks (AR) and carbonatites  (CA)  massifs (UMARC) are located on the SW and NW borders of the Siberian platform, respectively.</p><p>Mass-spectrometer ...
Victor Ponomarchuk, Sergey Zhmodik, Igor Ashchepkov, Dmitry Belyanin, Olga Kiseleva, Alexander Pyryaev   +5 more
openaire   +1 more source

Olivine in Ultramafic Lamprophyres: Chemistry, Crystallisation, and Melt Sources of Siberian Pre- and Post-Trap Aillikites

Contributions To Mineralogy and Petrology, 2018
We studied olivines from the Devonian pre-trap (the Ilbokich occurrence) and the Triassic post-trap (the Chadobets occurrence) carbonate-rich ultramafic lamprophyres (UMLs) in the southwestern portion of the Siberian craton. On the basis of detailed investigations of major, minor, and trace-element distributions, we have reconstructed the main ...
Anna Nosova, Alexey Vladimirovich Kargin, A V Lapin   +2 more
exaly   +2 more sources

Water contents and hydrogen isotope compositions of amphibole in aillikites from the Tarim large igneous province, NW China: Insight into Earth’s deep water cycle

Geological Society of America Bulletin, 2023
Water is known to play a crucial role in the generation of many large igneous provinces (LIP) worldwide, but the amount and origin of the water in their sources is still under debate. To address this question, this paper presents in situ major-, trace-element, and Sr isotope data coupled with bulk-mineral O-H-He isotope analyses of amphibole in a suite
Changhong Wang, Zhaochong Zhang, Andrea Giuliani, Hongze Bo, Lukáš Krmíček, Xiaoguang Li   +5 more
openaire   +1 more source

The first discovery of the paleoproterozoic aillikite dykes in Sarmatia: geochemistry and petrogenesis

Doklady Rossijskoj akademii nauk. Nauki o Zemle
The aillikite dykes of carbonate-biotite composition, intersecting the Paleoproterozoic banded iron formations, were discovered in the Kursk block of Sarmatia for the first time. Their age is 2.10–2.07 Ga. The aillikite dykes have undergone epidote-amphibolite facies metamorphism (550 °С, 2–3 kbar), they are deformed and fouled; primary magmatic ...
K. A. Savko, A. V. Samsonov, S. V. Tsybulyaev, N. S. Bazikov, E. H. Korish, R. A. Terentiev   +5 more
openaire   +1 more source

ASTER Spectral Analysis of Ultramafic Lamprophyres (Carbonatites and Aillikites) Within the Batain Nappe, Northeastern Margin of Oman: A Proposal Developed for Spectral Absorption

International Journal of Remote Sensing, 2013
We developed a scientific proposal on spectral absorption in remote sensing and a new image-processing method that is purely based on multispectral satellite image spectra to map ultramafic lamprophyre and carbonatite occurrences. The proposed method provides a simple, yet efficient, tool that will help exploration geologists.
Sobhi Nasir, Sankaran Rajendran
exaly   +2 more sources

Petrology of the Abloviak Aillikite dykes, New Québec: evidence for a Cambrian diamondiferous alkaline province in northeastern North America

Canadian Journal of Earth Sciences, 2000
A dozen ultramafic lamprophyre dykes have been identified in the eastern part of Ungava Bay, Québec. The dark grey dykes are composed of macrocrysts of olivine and phlogopite featuring tetraferriphlogopite rims. These minerals are included in a matrix consisting of fine-grained phlogopite, olivine, spinel, and interstitial carbonate.
Stéphane Digonnet, Normand Goulet, James Bourne, Ross Stevenson, Doug Archibald   +4 more
openaire   +1 more source

The newly discovered neoproterozoic aillikite occurrence in Vinoren (Southern Norway)

2020
During the period 750-600 Ma ago, prior to the final break-up of the supercontinent Rodinia, the crust of both the North American Craton and Baltica was intruded by significant amounts of rift-related magmas originating from the mantle. In the Proterozoic crust of Southern Norway, the 580 Ma old Fen carbonatite-ultramafic complex is a representative of
Zozulya, Dmitry R., Kullerud, Kare, Ribacki, Enrico (Dr.), Altenberger, Uwe (Dr.), Sudo, Masafumi (Dr.), Savchenko, Yevgeny E.   +5 more
openaire   +1 more source

The newly discovered Jurassic Tikiusaaq carbonatite-aillikite occurrence, West Greenland, and some remarks on carbonatite–kimberlite relationships

Lithos, 2009
Abstract We discuss mineral chemistry data and report ten high-precision U–Pb (zircon, baddeleyite, pyrochlore, and perovskite) and Rb–Sr phlogopite ages for the newly discovered Tikiusaaq carbonatite intrusion and associated ultramafic dykes from the North Atlantic craton, West Greenland.
Sebastian Tappe, Agnete Steenfelt, Larry M. Heaman, Antonio Simonetti   +3 more
openaire   +1 more source