Results 21 to 30 of about 188 (175)
Geosciences, 2019 Ultramafic magmas (MgO ≥ 18 wt%) are generally thought to be primary mantle melts formed at temperatures in excess of 1600 °C. Volatile contents are expected to be low, and accordingly, high-Mg magmas generally do not yield large explosive ...
Alessandra Correale +2 more
doaj +1 more source
Geologica Carpathica, 2019 The Teschenite Association Rocks (TAR) in the Outer Western Carpathian (OWC) flysch form a classic suite of alkaline intrusions where teschenite and picrite were first defined. They represent continental intraplate volcanism that produced a wide range of
Brunarska Irena, Anczkiewicz Robert
doaj +1 more source
Геодинамика и тектонофизика, 2021 The Geochemical and mineralogical studies showed, that harzburgites of the Chagan-Uzun massif are restites with a degree of partial melting 15–20 %, which formed at temperatures 1520–1420 °С under the conditions of the mid-oceanic ridge and transformed ...
V. A. Simonov +3 more
doaj +1 more source
Geologica Carpathica, 2014 The main products of volcanic activity in the teschenite-picrite association (TPA) are shallow, sub-volcanic intrusions, which predominate over extrusive volcanic rocks.
Szopa Krzysztof +2 more
doaj +1 more source
Petrogenesis and tectonic significance of mafic–ultramafic rocks from Southwest Yunnan, China
Comptes Rendus. Géoscience, 2020 This study focuses on the mafic–ultramafic lavas of the Early Carboniferous outcrop in Mangxin, southwestern Yunnan, China. Picrites with 26–32 wt% MgO and a quenched texture are the most significant components of this rock association.
Shi, Qing, Fang, Nianqiao
doaj +1 more source
The Salittu Formation in southwestern Finland, part II: Picritic-basaltic volcanism in mature arc environment [PDF]
Bulletin of the Geological Society of Finland, 2017 Svecofennian orogen that contain ultramafic rocks. New samples were collected from the picritic and basaltic rocks as well as spatially associated gabbroic rocks, and their major and trace element compositions are presented and discussed here.
M. Nironen
doaj +1 more source
Hot or Fertile Origin for Continental Break-Up Flood Basalts: Insights from Olivine Systematics
Lithosphere, 2022 The break-up of supercontinents is often temporally and spatially associated with large outpourings of basaltic magmas in the form of large igneous provinces (LIPs) and seaward dipping reflectors (SDRs).
Jackson Stone Borchardt, Cin-Ty Lee
doaj +1 more source
CRYSTALLIZATION CONDITIONS OF OLIVINE IN DUNITES THE GULI MASSIF, SIBERIAN PLATFORM [PDF]
МинералогияCrystallization conditions of olivine in dunites of the Guli massif (Siberian Platform) are established using petrological, geochemical, mineralogical and thermobarogeochemical methods.
V.A. Simonov +3 more
doaj +1 more source
Picrites of the Kamchatka–Koryak Region
Russian Journal of Pacific GeologyBased on new data on tectonic evolution of Kamchatka and Koryakia (NE Russia) chemical composition of ultramafic volcanics (picrites) are characterized. Ultramafic rocks of the studied territory are divided into two petrochemical types: 1) comparable with normal (N-MORB) and transitional to enriched (T-MORB) basaltoids of the ocean and 2) comparable ...
Z. G. Badredinov, B. A. Markovsky
openaire +2 more sources
Yankuang ceshi, 2022 BACKGROUND Selenium (Se) is one of the essential trace elements for humans, and an important way for humans to obtain and supplement selenium is by eating natural selenium-enriched agricultural products. The geochemical characteristics of selenium in the
ZHAO Chen +6 more
doaj +1 more source