Results 1 to 10 of about 127 (117)

GEOCHRONOLOGY OF ULTRAMAFIC LAMPROPHYRE DIKES IN THE TOMTOR COMPLEX

Геодинамика и тектонофизика
This work studies thin ultramafic lamprophyre (UML) dikes associated with the Tomtor alkaline-ultramafic massif (Arctic Siberia). 40Ar/39Ar dating yielded an emplacement age of 710 Ma for the dikes.
S. V. Malyshev, E. A. Gladkochub, A. A. Karimov, A. V. Ivanov, A. M. Pasenko, A. A. Shalamova, D. R. Sitkina, A. V. Travin, N. V. Bryanskiy   +8 more
doaj   +2 more sources

New insights from field observations of the Younger giant dyke complex and mafic lamprophyres of the Gardar Province on Tuttutooq island, South Greenland

GEUS Bulletin, 2021
The Gardar Province of south Greenland is defined by the products of alkaline igneous magmatism during the Mesoproterozoic. The most laterally extensive Gardar intrusions are a series of giant dyke complexes best exposed on the Tuttutooq archipelago.
Lot Koopmans, Robert A. Webster, Rory Changleng, Lucy Mathieson, Alasdair J. Murphy, Adrian A. Finch, William McCarthy   +6 more
doaj   +1 more source

GEOCHEMICAL FEATURES OF DIKE AILLIKITES AND ALKALINE ROCKS OF THE BOLSHETAGNINSKY MASSIF (URIK-IYA GRABEN, EAST SAYAN REGION)

Геодинамика и тектонофизика, 2022
The ICP-MS determinations have been made on microelement content of ~650–640 Ma ultramafic lamprophyre-aillikite dikes and alkaline silicate rocks and carbonatites from the Bolshetagninsky ijolite-syenite massif, spatially overlapped in the northern Urik-
V. B. Savelieva, E. P. Bazarova, Yu. V. Danilova, B. S. Danilov   +3 more
doaj   +1 more source

Petrology, Age, and Rift Origin of Ultramafic Lamprophyres (Aillikites) at Mount Webb, a New Alkaline Province in Central Australia

Geochemistry, Geophysics, Geosystems, 2023
Diamond exploration over the past decade has led to the discovery of a new province of kimberlitic pipes (the Webb Province) in the Gibson Desert of central Australia.
Z. J. Sudholz, T. H. Reddicliffe, A. L. Jaques, G. M. Yaxley, M. Haynes, A. Gorbatov, K. Czarnota, C. Frigo, R. Maas, B. Knowles   +9 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

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

Carboniferous continental margin mafic-ultramafic sheeted dyke complex in the West Magnitogorsk zone (Southern Urals)

Известия высших учебных заведений: Геология и разведка, 2019
In the West of the aHochthon of Magnitogorsk zone thrusted onto the Precambrian complexes of the Uraltau zone, the Devonian island-arc complexes overlap stratigraphicalry the Ordovician and Silurian chert-basalt sequences and serpentine melange.
A. V. Ryazantsev, L. A. Novikov, A. A. Razumovskij   +2 more
doaj   +1 more source

Cenozoic Exhumation Across the High Plains of Southeastern Colorado from (U-Th)/He Thermochronology [PDF]

Lithosphere
Colorado’s High Plains stand at anomalously high elevations (~1300–2100 m) for their continental interior setting, but when and why this region became elevated is poorly understood.
Sabrina J. Kainz, Lon D. Abbott, Rebecca M. Flowers, Aidan Olsson, Skye Fernandez, James R. Metcalf   +5 more
doaj   +1 more source

Some notes on the IUGS classification of lamprophyric rocks

Mineralogia
The lamprophyric rocks are uncommon volatile-rich melanocratic porphyritic rocks which contain only mafic phenocrysts. The felsic minerals are confined in the groundmass. They occur as dikes, sills and diatremes.
Kamvisis Ioannis, Phani Pothuri Ramesh Chandra   +1 more
doaj   +1 more source

A few thoughts on the diamondiferous nature of lamprophyres from Wajrakarur Kimberlite Field, Southern India

Mineralogia
Lamprophyre Clan Rocks (LCRs) such as lamprophyres, lamproites and kimberlites are reported from many parts of the cratonic areas in India, especially the diamondiferous Eastern Dharwar Craton (EDC).
Phani P. Ramesh Chandra, Kamvisis Ioannis   +1 more
doaj   +1 more source