X-ray study of the graphite-bearing rocks from the Pestpaksha ore occurrence and structural features of graphiteLithology and Mineral Resources - Tập 46 - Trang 363-368 - 2011
S. A. Volkova, O. M. Il’icheva, O. B. Kuznetsov
Graphite-bearing rocks and graphites from the Precambrian metamorphic sequence of the Pestpaksha ore occurrence, Murmansk district, have been studied by the X-ray method. It was determined that the rocks have a complex polycomponent composition. Graphite is associated with garnet-quartz, pyroxene-amphibole, and biotite-quartz with an admixture of pyrrhotite, kyanite, chlorite, and other minerals. ...... hiện toàn bộ
The Lithogenic Nature of Some Gold Deposits in Carbonaceous–Terrigenous SequencesLithology and Mineral Resources - Tập 37 - Trang 239-250 - 2002
S. G. Parada
Carbonaceous–terrigenous sequences hosting the largest gold deposits in Russia are divided for the first time into two lithochemical (normal potassic and anomalous sodic) rock types. It is shown that the type of terrigenous rock alkalinity is governed by peculiarities of the tectonic evolution of sedimentary-rock basins and stages of lithogenesis. The alkalinity type reflects the character of ore-...... hiện toàn bộ
Continental margins as global oil and gas accumulation belts: The West Pacific beltLithology and Mineral Resources - Tập 45 - Trang 465-485 - 2010
A. I. Konyukhov
Most present-day oil- and gas-bearing (petroliferous) basins are localized in one of the five global oil and gas accumulation belts confined to continent-ocean transition zones that existed in the Mesozoic and Cenozoic. Two meridional belts are located in the western and eastern peripheral zones of the Pacific Ocean with intense tectonic activity during the major part of the Mesozoic and Cenozoic....... hiện toàn bộ
Composition and Formation Conditions of Lower Eocene Shallow-Marine Carbonates in Southern ArmeniaLithology and Mineral Resources - Tập 56 - Trang 438-459 - 2021
P. A. Fokin, E. Yu. Zakrevskaya, L. G. Sahakyan, T. E. Grigoryan
Nummulite facies are known to be a good indicator of Eocene shallow-water paleoenvironments. Nummulitic limestones are widespread in the Lower Eocene of Armenia—the Tethys/northern Peri-Tethys transition zone, but they are studied insufficiently so far. The objective of this work was an integrated study of Lower Eocene deposits in the typical Urtsadzor section (Ararat region, Armenia): detailizati...... hiện toàn bộ
Metapelites of the Valyukhta Formation as indicators of the Riphean residual weathering crust, Patom HighlandLithology and Mineral Resources - Tập 42 - Trang 15-20 - 2007
V. N. Sharov, Yu. I. Sizykh
Bimodal metapelites of complex (sedimentary-epigenetic) origin were found at the base of the Upper Riphean Zhuya Group, which disconformably overlies the Lower-Middle Riphean Kadalikan Group. The substrate of these rocks is represented by relatively low-aluminous mudstones of the Valyukhta Formation, which bear evidence of physical disintegration replaced upsection by chemical decomposition. The a...... hiện toàn bộ
Mineralogy, Mossbauer Characteristics, and K-Ar Isotopic Age of Glauconite from the Lower Cambrian Sediments, Western LithuaniaLithology and Mineral Resources - Tập 40 - Trang 353-363 - 2005
T. S. Zaitseva, I. M. Gorokhov, T. A. Ivanovskaya, B. B. Zvyagina, N. N. Mel’nikov, O. V. Yakovleva
The paper presents results of lithological-mineralogical, Mossbauer, and isotope-geochronological study of globular phyllosilicates (glauconite and illite) from the Lower Cambrian Virbalis Formation in western Lithuania. K-Ar dates of these minerals (382 and 374 Ma) do not correspond to stratigraphic positions of the studied samples and indicate the loss of radiogenic 40Ar, probably, in Middle Dev...... hiện toàn bộ