Results 101 to 110 of about 13,641 (263)
Carbonatite shows on the quartz deposits “Vein 175” (Ufalei block, the Southern Urals)
Литосфера, 2017 The subject of the study are manifestations of carbonatites in the quartz deposit “Vein № 175” - the largest deposit of granular quartz of Ufalei block in the Southern Urals.
Larisa Y. Kabanova +3 more
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REE minerals in Catalão II, Goias, Brazil [PDF]
, 2012 National audienceThe REE minerals pyroxenites and sövites of Catalão II show a substantial enrichment in REE from the magmatic stage. The activity of carbonate and CO32-/ PO43- ratio have played an important role in the formation of REE-carbonate ...
Bilal, Essaïd +3 more
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Calcite-saturated natrocarbonatites: composition, crystal morphology, and weathering
VolcanicaInterpretation of calcite-dominated fossil carbonatite volcanoes is complicated by the instability of many igneous carbonatite materials on Earth’s surface.
Michael Anenburg, Izzan Nur Aslam
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The East Greenland rifted volcanic margin [PDF]
Geological Survey of Denmark and Greenland Bulletin, 2011 The Palaeogene North Atlantic Igneous Province is among the largest igneous provinces in the world and this review of the East Greenland sector includes large amounts of information amassed since previous reviews around 1990.The main area of igneous ...
C. Kent Brooks
doaj
Melting of carbonated pelites at 8-13GPa: generating K-rich carbonatites for mantle metasomatism [PDF]
, 2018 The melting behaviour of three carbonated pelites containing 0-1wt% water was studied at 8 and 13GPa, 900-1,850°C to define conditions of melting, melt compositions and melting reactions.
Grassi, Daniele, Schmidt, Max
core
ZONATION OF PHLOGOPITE OF CARBONATITE-PEGMATITES OF THE BULDYM DEPOSIT OF THE VISHNEVYE MOUNTAINS (SOUTH URALS) [PDF]
Минералогия, 2017 In a plate 19 cm in size from the columnar crystal of phlogopite Buldym deposit in the Southern Urals, we studied the composition of alternating greenish-brown, yellowish-brown and darker brown areas by electron-probe microanalysis.
V.I. Popova +3 more
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Magmatic Longevity of Laacher See Volcano (Eifel, Germany) Indicated by U-Th Dating of Intrusive Carbonatites [PDF]
, 2017 Uranium-series dating of carbonatitic ejecta clasts constrains the crystallization and differentiation timescales of the Laacher See volcano, which erupted 6·3 km3 of magma (dense rock equivalent) during one of the largest Late Quaternary eruptions in ...
Cooper, Kari M. +4 more
core
Geological rhythms and cometary impacts [PDF]
Time series analysis reveals two dominant, long-term periodicities approximately equal to 32 and 260 million years in the known series of geological and biological upheavals during the Phanerozoic Eon.
Rampino, M. R., Strothers, R. B.
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Tremor signals reveal the structure and dynamics of the Oldoinyo Lengai magmatic plumbing system
Communications Earth & EnvironmentEarth’s only active carbonatite volcano Oldoinyo Lengai, Tanzania, is a peculiar endmember of volcanism in a young rift segment. Targeted by many petrological studies due to its effusive, cold carbonatite eruptions, its subsurface structure has only been
Miriam Christina Reiss +3 more
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Геодинамика и тектонофизикаThe Ilmen-Vishnevogorsky and Buldym carbonatite complexes occurring in the Southern Urals represent linear deformed carbonatite complexes. Their origin, as well as the age and geodynamic conditions remain the subject of debate.
I. L. Nedosekova
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