Results 41 to 50 of about 858 (191)

The Picrite-Teschenite Sill of Lugar (Ayrshire) [PDF]

Quarterly Journal of the Geological Society of London, 1916
I. Introduction. The association of teschenite and ultrabasic rocks (picrite and peridotite) in a single rock-body has now been established for several occurrences in the lowlands of Scotland. The Barnton occurrence, near Edinburgh, has been described by Sir Archibald Geikie,1 by Mr. J. Henderson & Mr. J. G. Goodchild, and by Mr. H.
openaire   +1 more source

(Table 1) Composition of phases of alkali picrites from seafloor hights in the southwestern Greenland continental margin

, 2006
(Table 1) Composition of phases of alkali picrites from seafloor hights in the southwestern Greenland continental ...
A V Bobrov (6964214), Ovsyannikov, A O, A O Ovsyannikov (6964211), Bobrov, A V   +3 more
core   +1 more source

Melt inclusions in olivines from early Iceland plume picrites support high 3He/4He in both enriched and depleted mantle

, 2012
High 3He/4He ratios (up to 50 Ra) are present in near-primary picrite flows from Baffin Island and West Greenland (BIWG) that span a range of compositions from depleted to relatively enriched in incompatible trace elements [Starkey, N.A., Stuart, F.M ...
Larsen, L.M., Fitton, J.G., Stuart, F.M., Starkey, Natalie A., Fitton, J. Godfrey, Starkey, N.A., Stuart, Finley M., Larsen, Lotte M.   +7 more
core   +1 more source

Paleomagnetism of the Scourie Dykes, Lewisian Foreland, NW Scotland: Constraints on Early Paleoproterozoic Paleogeography of Kenorland

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 10, October 2026.
Abstract The Scourie dyke swarm in the Lewisian foreland of northwest Scotland provides key constraints on the Paleoproterozoic evolution of the North Atlantic craton. High‐precision U‐Pb geochronology identifies two distinct intrusive phases at ∼2.41–2.38 Ga and ∼2.00 Ga.
M. Mirzaei, V. A. Kravchinsky, F. Alizadeh, L. Heaman, A. Goguitchaichvili   +4 more
wiley   +1 more source

Typification of platinim metal bearing picrites from the north-west of Kansk greenstone belt (East Sayan)

Известия Томского политехнического университета: Инжиниринг георесурсов, 2018
The objects of the study are mafic-ultramafic complexes of Kulibinsk potential ore unit, including intrusive bodies of kingashsk complex and metavolcanic rocks of kuliginskaya and kuzinskaya series; the studied objects are located at the north-west edge ...
Alexey Ivanovich Chernyshov, Nikita Anatolievich Babintsev   +1 more
doaj   +2 more sources

Geodynamic process and its geologic manifestations in the continents

Геофизический журнал, 2018
The data on the composition of the mantle and crust, results of experimental studies on melting under the pressure interval 0,5—0,7 GPa and temperatures 500—2000 °C have been integrated.
O. Usenko
doaj   +1 more source

Evaluating Forced Versus Plume‐Induced Subduction Initiation for the Talkeetna‐Bonanza Arc System: Implications for Permo‐Triassic Paleogeography of the North American Cordillera

Tectonics, Volume 45, Issue 9, September 2026.
Abstract The mechanisms by which new subduction zones form remain highly debated. Here we use Permo‐Triassic strata to evaluate potential mechanisms for initiation of the Talkeetna‐Bonanza Arc of the northern North American Cordillera. New mapping and analysis of Permian and Upper Triassic strata on the Alaska Peninsula suggest a period of uplift ...
Brandon M. Keough, Michael P. Eddy, Kenneth D. Ridgway   +2 more
wiley   +1 more source

The Blue Hills Intrusive Complex in Southern Namibia—relationships between carbonatites and monticellite picrites

, 1999
Geochemical and petrological investigations were carried out on ultrabasic silicate and carbonatite magmatic rocks from the Blue Hills Intrusive Complex (southern Namibia).
G.P Brey, S Kurszlaukis, L Franz, Brey, G. P., Franz, L., Kurszlaukis, S.   +5 more
core   +1 more source

(Ultra)high‐Pressure Metamorphism in Sedimentary Versus Basaltic Rocks: Insights From a Variscan Mélange in the South Carpathians

Journal of Metamorphic Geology, Volume 44, Issue 8, Page 585-610, September 2026.
ABSTRACT Reconstructing the pressure–temperature–time (P–T–t) evolution of (ultra)high‐pressure rocks is essential for constraining subduction and collisional dynamics. Subduction zones are often investigated using basic eclogites, whereas nonbasic high‐pressure rocks remain comparatively understudied, potentially hindering a comprehensive ...
Otavio S. G. Silva, Bruno V. Ribeiro, Gavril Săbău, Fabricio Caxito, Paulo A. de Paiva‐Silva, Pierre Lanari, George Luvizotto, Mahyra Tedeschi   +7 more
wiley   +1 more source

Compositional Variation of Picrites in the Emeishan Large Igneous Province Modulated by Water in the Mantle Plume

, 2022
Initiation of large igneous provinces (LIPs) and temporal and spatial variations in their chemical compositions provide unique opportunities to understand mantle dynamics.
J. Liu, Gu, X. Y., E. Hanski, H. Sun, Sun, H., H. Chen, T. Kuritani, Q. K. Xia, Hanski, E., X. Y. Gu, Xia, Q. K., Kuritani, T., Chen, H., Liu, J.   +13 more
core   +1 more source