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Now showing items 1-20 of 170
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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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(2006)The Early to Middle Jurassic Talkeetna Arc section exposed in the Chugach Mountains of south–central Alaska is 5–18?km wide and extends for over 150?km. This accreted island arc includes exposures of upper mantle to volcanic ...
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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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(2006)Paleontological study of Upper Jurassic and Lower Cretaceous sediments recovered by boreholes in the Agan-Vakh and Nadym-Vengapur interfluves clarified environments of their deposition. As is shown, influx of siliciclastic ...
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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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(2003)The Jurassic/Cretaceous boundary interval in the northern hemisphere is characterized by the widespread occurrence of black shales. About 60% of all petroleum source rocks comprise sediments of late Jurassic and early ...
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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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(2006)During diagenesis of Jurassic and Cambrian oil source rock shales illite-smectite(-vermiculite) [I-S(-V)] is transformed to illite-tobelite-smectite(-vermiculite) [I-T-S(-V)]. This transformation of S layers to T layers ...
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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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(2004)Cladistic analysis of the Middle Jurassic ammonite radiation shows how the Aalenian-age ancestral stock, known variously as the Hammatocerataceae or Hammatoceratinae, gave rise to numerous new groups in Bajocian times. ...
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(2004)Hymenopteran fossils from Daohugou, Inner Mongolia, China are assigned to 17 families. These include, in decreasing order of importance, Ephialtitidae, Xyelidae, Siricidae, Xyelydidae, Anaxyelidae, Karatavitidae s.l., ...
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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 ...
Now showing items 1-20 of 170