Results 21 to 30 of about 141 (134)

Geochemical and Isotopic Constraints on Long‐Lived Source Enrichment and Mantle Evolution in Paleoproterozoic Cratonic Lamprophyres

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 6, June 2026.
Abstract The cratonic lithospheric mantle records complex metasomatic processes and is frequently tapped by alkaline magmatism, offering a unique opportunity to trace the progressive evolution of the mantle. In the present contribution, we investigate a newly identified calc‐alkaline lamprophyre field from the Neoarchean Jonnagiri Schist Belt, Eastern ...
Sourav Naskar, Rohit Pandey, Nils Björn Baumann, N. V. Chalapathi Rao, George Mathew, J. Amal Dev, J. K. Tomson   +6 more
wiley   +1 more source

The Rudnik Mts. volcano-intrusive complex (central Serbia): An example of how magmatism controls metallogeny

Geologia Croatica, 2016
This study reports and discusses new radiometric ages, petrographical and volcanological observations and whole rock geochemical data of the rocks of the Rudnik Mts. volcano-intrusive complex. The complex hosts a Pb-Zn-Ag deposit and belongs to the Serbo-
Vladica Cvetković, Kristina Šarić, Zoltán Pécskay, Axel Gerdes   +3 more
doaj   +1 more source

Episodic Rifting of a Large Igneous Province Concentrated Along a Microcontinent Boundary

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 4, April 2026.
Abstract Many large igneous provinces (LIPs) comprise once contiguous magmatic products that are now fragmented across multiple tectonic plates. Emplacement of these voluminous magmatic products is commonly coeval with, or shortly followed by, fragmentation into constituent domains.
Jeremy L. Asimus, Hugo K. H. Olierook, Sally A. Gibson, Joanne M. Whittaker, Jacqueline A. Halpin, Nathan R. Daczko, Millard F. Coffin, Daniel E. Heaton, Anthony A. P. Koppers, Kaj Hoernle, Folkmar Hauff, Ivan Belousov   +11 more
wiley   +1 more source

DURATION OF GRANITOID MAGMATISM IN PERIPHERAL PARTS OF LARGE IGNEOUS PROVINCES (BASED ON 40AR/39AR ISOTOPIC STUDIES OF ALTAI PERMIAN-TRIASSIC GRANITOIDS)

Геодинамика и тектонофизика, 2017
In large igneous provinces (LIP) of fold areas, granitoid rocks are dominant, while mantle-derivated rocks play a subordinate role in rock formation. If magma emissions are impulsive, it may take 25–30 million years for a LIP to form and take shape.
O. A. Gavryushkina, A. V. Travin, N. N. Kruk   +2 more
doaj   +1 more source

Лампроїт [Lamproit]

, 2016
ЛАМПРОЇ́Т – багата калієм і магнієм лапрофірова гірська порода вулканічного або гіпабісального походження. Термін увів 1923 швейцар. мінералог П. Ніґґлі. Зазвичай порода пред­ставлена одним або декількома мінералами: олівіном, клінопіроксеном , титановміс. флогопітом, лейцитом, а... ⚠️ Цей запис містить лише бібліографічні метадані.
openaire   +3 more sources

Southern Urals lamproites: the problems of terminology, age, and geodynamic interpretation

Литосфера, 2017
We have studied mineral and chemical composition of lamproites from Kalymbaevsky Complex the Middle Trias. These lamproites were developed in Magnitogorsk and Eastern-Urals megazones of the Southern Urals.
S. V. Pribavkin
doaj   +2 more sources

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

Neogene-Quaternary magmatic activity and its geodynamic implications in the Central Mediterranean region

Annals of Geophysics, 1997
The petrogenesis and time/space distribution of the magmatism associated with the formation of the Northern and Southern Tyrrhenian basins, together with the directions and ages of lithospheric extension and/or spreading north and south of the 410N ...
G. Serri
doaj   +1 more source

Evolution of the Source Mineralogy and Lithospheric Controls on Magmatism During the Northeast Atlantic Continental Breakup

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 2, February 2026.
Abstract The mid‐Norwegian Margin, part of the North Atlantic Igneous Province (NAIP), is a well‐studied volcanic rifted margin formed during the breakup between Greenland and Eurasia ∼56 Ma, with the largest accumulation of magmatic material hosted by the Vøring Margin section.
Emily H. Cunningham, Sarah Lambart, Pengyuan Guo, Sayantani Chatterjee, Christian Tegner, Autumn Hartley, Ashley M. Morris, Sverre Planke, Christian Berndt, Carlos A. Alvarez Zarikian, Peter Betlem, Henk Brinkhuis, Marialena Christopoulou, Eric C. Ferré, Irina Y. Filina, Joost Frieling, Dustin T. Harper, Morgan T. Jones, Jack Longman, John M. Millett, Geoffroy T. F. Mohn, Reed P. Scherer, Natalia Varela, Weimu Xu, Stacy L. Yager   +24 more
wiley   +1 more source

Reconciling Seismic and Thermo‐Chemical Models of Cratonic Lithosphere

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 2, February 2026.
Abstract Most published global and regional shear‐wave (VS ${V}_{\mathrm{S}}$) velocity models of cratons include a VS ${V}_{\mathrm{S}}$ increase with depth below the Moho, with a maximum at 100–150 km depth. This feature has long been debated, as it appears to require either (implausible) temperature decreases with depth, or substantial, layered ...
Sefira Davison, Sergei Lebedev, Yihe Xu, Sally Gibson, Chiara Civiero, Javier Fullea   +5 more
wiley   +1 more source