Zobrazeno 1 - 10
of 34
pro vyhledávání: '"I. Alekseev"'
Publikováno v:
Geology of Ore Deposits. 62:629-637
A complex of accessory W-bearing tantalo-niobates (columbite-(Fe), columbite-(Mn), tantalite-(Mn), microlite group minerals, and Ta-bearing rutile) involving “wolframoixiolite” has been found for the first time in Li–F granite and ongonite of t
Autor:
Yu. B. Marin, V. I. Alekseev
Publikováno v:
Geology of Ore Deposits. 62:719-730
—The problem of the origin of “white granite” in the Kester harpolith of the Arga–Ynnakh–Khaya Pluton is discussed. The morphology, occurrence, and nature of the intrusive contacts of the Kester harpolith prove its magmatic origin. The petr
Autor:
Yu. B. Marin, V. I. Alekseev
Publikováno v:
Geology of Ore Deposits. 61:654-662
The pyrochlore-group minerals in ongonite and zwitter of the Verkhneurmiysky granite pluton in the Badzhal district, Russian Far East are reported. The composition, genesis, and crystallization sequence are characterized. Three rare species of pyroch
Autor:
S. Verbitskii, R. Pronishin, Iu. Verbitskii, M. Chuba, I. Keleman, A. Stets'kiv, N. Stepanenko, I. Iliesh, I. Alekseev, N. Simonova
Publikováno v:
Zemletriaseniia Severnoi Evrazii [Earthquakes in Northern Eurasia]. :32-42
The seismic observations in the Carpathian region in 2013, which were conducted, as before, by two organizations from two states: in Ukraine, by the seismicity department of the Carpathian region of the Institute of Geophysics of the National Academy
Publikováno v:
Fossil Record. 22:111-118
A new fossil species of the silvanid flat bark beetle genus Cathartosilvanus Grouvelle is described and illustrated from Baltic amber. Cathartosilvanus siteiterralevis sp. nov. differs from recent and fossil congeners in the distinct, sharp denticle
Publikováno v:
Fossil Record. 22:65-72
The holotype of Dignomus regiomontanus Alekseev, 2014, from the Eocene Baltic amber (Tertiary, Paleogene), is re-examined and re-described. Dignoptinus gen. nov. is proposed to place this species. Bruchoptinus Reitter, 1884, and Pseudoptinus Reitter,
Publikováno v:
Doklady Earth Sciences. 490:65-67
The phenomenon of an abnormally high concentration of tantalum (5.3–17.9% of Ta2O5) in accessory cassiterite from lithium–fluoric granites of the Arga-Ynnakh-Khaysky massif in East Yakutia is described. The significant isomorphic capacity of the
Publikováno v:
Russian Journal of Pacific Geology. 13:120-131
The by-products of the Far East Sn deposits related to Li–F granites include trace elements. The petrography and mineral composition of the Sn-bearing metasomatites of the Verkhneurmiysky ore cluster (VUOC) of the Amur region (feldspatites, greisen
Publikováno v:
Geology of Ore Deposits. 60:698-707
Niobium minerals in zwitter and lithium–fluorine granite of the Verkhneurmiysky granitic massif in the Amur River region—fergusonite-(Y), euxenite-(Y), samarskite-(Yb), aeschynite, Nb-bearing wolframite— have been described and the similarity o
Autor:
V. I. Alekseev, A. Bukejs
Publikováno v:
Fossil Record 24(2): 223-231
Fossil Record, Vol 24, Pp 223-231 (2021)
Fossil Record, Vol 24, Pp 223-231 (2021)
Acritus sutirca sp. nov. is described and illustrated from Eocene Baltic amber on the basis of one adult male specimen. As the first extinct member of the subfamily Abraeinae (Histeridae) and the smallest known fossil histerid specimen, this material