Results 71 to 80 of about 5,323 (197)
Geosciences, 2018 This article is devoted to the geology of titanium-rich varieties of the Petyayan-Vara rare-earth dolomitic carbonatites in Vuoriyarvi, Northwest Russia. Analogues of these varieties are present in many carbonatite complexes. The aim of this study was to
Evgeniy Kozlov +3 more
doaj +1 more source
Alkaline magmatism and REE resources: a European overview, and links to Canada [PDF]
, 2014 In recent years, the European Union (EU) has prioritised the issue of critical raw materialsa – those materials which are important for the economy, but have risks to their supply.
Deady, Eimear +5 more
core
Lava channel formation during the 2001 eruption on Mount Etna: evidence for mechanical erosion [PDF]
, 2005 We report the direct observation of a peculiar lava channel that was formed near the base of a parasitic cone during the 2001 eruption on Mount Etna. Erosive processes by flowing lava are commonly attributed to thermal erosion.
Carmelo Ferlito +13 more
core +1 more source
The Gronnedal-Ika carbonatite-syenite complex, South Greenland: Carbonatite formation by liquid immiscibility [PDF]
, 2005 The Gronnedal-Ika complex is dominated by layered nepheline syenites which were intruded by a xenolithic syenite and a central plug of calcite to calcite-siderite carbonatite. Aegirine-augite, alkali feldspar and nepheline are the major mineral phases in the syenites, along with rare calcite.
HALAMA, RALF +3 more
openaire +2 more sources
The role of high- and low-temperature ocean crust alteration for the marine calcium budget [PDF]
, 2007 Calcium (Ca) is a key element for the understanding of the chemical evolution of the ocean and for the global climate on long geological time scales.
Amini, Marghaleray
core
Responsible sourcing of critical metals [PDF]
, 2017 This is the author accepted manuscript. The final version is available from Mineralogical Society of America via the DOI in this recordMost critical raw materials, such as the rare earth elements (REE), are starting products in long manufacturing supply ...
Alain Rollat +15 more
core +1 more source
MICA COMPOSITION REFLECTING CONDITIONS OF AILLIKITE FORMATION IN ZIMA COMPLEX OF EASTERN SIBERIA
Геодинамика и тектонофизикаFour types of mica were identified in the macrocryst and fine porphyry aillikites from the Yarma zone of the Urik-Ija graben considering specific features of morphology, chemical composition, zonation and crystallization conditions.
V. B. Savelyeva +4 more
doaj +1 more source
An Overview of the Carbonatites from the Indian Subcontinent
Open Geosciences, 2020 Carbonatites are carbonate-rich rocks of igneous origin. They form the magmas of their own that are generated in the deep mantle by low degrees of partial melting of carbonated peridotite or eclogite source rocks.
Randive Kirtikumar, Meshram Tushar
doaj +1 more source
NEW DATA ON PYROCHLORE FROM THE TATARKA DEPOSIT (YENISEI RIDGE, RUSSIA) [PDF]
Минералогия, 2017 Large pyrochlore crystals (up to 6 cm) from ores of the Tatarka deposit are studied, as well as their compositional zoning and relations with associated minerals.
V.I. Popova +8 more
doaj
Anais da Academia Brasileira de Ciências, 2001 The Araxá complex (16 km²) comprises carbonatites forming a central core and a complex network of concentric and radial dykes as well as small veins; additionally, it includes mica-rich rocks, phoscorites and lamprophyres.
GIANBOSCO TRAVERSA +7 more
doaj +1 more source