Browsing ELibrary by Subject "Jurassic"
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Browsing ELibrary by Subject "Jurassic"
Now showing items 1-20 of 129
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(1999)Following accretion of southern Siberian microcontinents to the Siberian craton in the Early Paleozoic, five cycles of K-rich silicic magmatism, progressively decaying in volume, occurred on batholithic scales throughout ...
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(1995)Hydrous pyrolysis, using progressive heating from 150 to 365°C, is used to study the generation and isotopic composition of hydrocarbon gases and carbon dioxide. Different source rocks from the Draupne, Heather, Dunlin and ...
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(2001)13C-depleted E and Z n-tricos-10-enes are prominent biomarkers in an anaerobic microbial mat at Black Sea methane seeps. These n-alkenes co-occur with archaeal irregular C25 isoprenoid hydrocarbons, namely 2,6,10,15,19-p ...
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(1989)The first occurrences of lamproites in Soviet Union were identified on the Aldan Shield, in the region of the Murun Pluton and in the Central Aldan block. By the geological position of the lamproite bodies and the geological ...
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(2001)The discovery of hydrocarbon reservoirs in Upper Jurassic sediments in the central part of the Krasnoleninsk arch required stratification of these deposits and separation of its oil reservoirs; correlation of their sections ...
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(1988)We found natural lead-antimony alloys with very little or no tin, in heavy mineral concentrates from the Yukhotochka and the Tayezhka Creeks in the southeastern part of the Yukhta fault zone, central Aldan. The streams ...
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(2001)This paper discusses the petrography, petrochemistry and geochemistry of basalts of the Erdagou volcanic-cherty Formation in the Taukha terrane, Southern Sikhote-Alin. The mid-Jurassic (Callovian) age of the basalts is ...
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(2003)Mollusk migrations of various intensity in the Kimmeridgian to Valanginian time span were established in the Boreal Atlantic (West and East European Provinces), Boreal Pacific (Chukotka-Canadian and Boreal Pacific Provinces), ...
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(1996)Abundance and carbon isotope data from an Fe(CO3)OH component in apparent solid solution in oolitic goethites have been used to infer ancient atmospheric CO2 pressures. A test of the validity of these estimates might be ...
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(2002)Current chemostratigraphical studies of the Jurassic System primarily involve the use of one sedimentary component (marine organic carbon), one divalent transition metal substituted in carbonate (manganese), and two isotopic ...
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(2003)Paleobotanical characteristics based on studied plant macrofossils and miospores from Jurassic sediments of the Kansk coal basin are discussed. The studied samples characterize the formation stratotypes and borehole sections. ...
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(2003)Composite stratigraphic sections of Lower-Middle Jurassic (pre-Callovian) deposits, which have been studied in the northern, axial, and southern parts of the Greater Caucasus central segment are described. Stratotypes and ...
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(1988)The development of the Kurile island arc is though to have begun in the Late Cretaceous. In the Neogene deposits on northern and southern islands of this ridge, including Kunashir, there are well-rounded fragments of granite ...
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(2004)Felsic magmatism has occurred over a large region of East Asia since Jurassic times and has provided important mineral resources such as tin, tungsten, base metals and gold. The circum-Japan Sea region preserves various ...
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(1988)For the first time for eastern Yakutia, encompassing the Mesozoides of the Verkhoyansk clastic complex in the Baraya anticlinorium (BA), the Sartang synclinorium (SS) and the South Verkhoyansk synclinorium (SVS), the ...
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(1998)Data on Jurassic foraminifers from key localities in continents and oceans is analyzed. Their distribution range spans the stratigraphic interval from the Aalenian to the Tithonian equal to 32 million years. Among 23 ...
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(2000)Composition of the Jurassic (Hettangian-Tithonian) foraminiferal communities in three paleozoochores: Tethyan, Boreal-Atlantic, and Arctic, is considered. Foraminiferal taxons of all ranks (from species to orders) are ...
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(2001)Early Cretaceous vertebrates at Shestakovo were known since 1953, when 2 partial Psittacosaurus skeletons were found. Intensive excavations and screen-washing at Shestakovo 1 and 3 localities, carried out since 1995 by a ...
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(1998)A transgressive-regressive (T-R) curve for the Jurassic and Lower Neocomian of the West-Siberian sedimentary basin was constructed on a detailed chronostratigraphic basis. This curve is compared with the quantitative ...
Now showing items 1-20 of 129