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Now showing items 41-60 of 120
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(2003)The cause of the late Paleozoic (ca. 355 255 Ma) ice age remains uncertain. A lowering of atmospheric carbon dioxide levels near the beginning of this time period occurred in response to the rise of land plants and likely ...
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(2004)Correlation and synthesis of published and new structural, paleomagnetic and geochronological data from Central Asia show the important role of strike-slip faulting in their evolution. The pattern of major strike-slip ...
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(2006)In the past twenty years 18 Cu - Ni sulfide deposits and occurrences were discovered in the Chinese Tianshan and Altay orogenic belts in northern Xinjiang, China. There are several belts and ore districts along several ...
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(2006)Coalfields in North China contain six to seven coal seams in the Permo-Carboniferous strata. The coal seams are underlain by the Ordovician limestone. Large-scale dewatering or depressurizing of the karst aquifer was ...
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(1997)The decision of March 9, 1992, of the Bureau of the Interdepartmental Stratigraphic Committee to change the position of the Carboniferous-Permian boundary, and, hence, of the upper Gzhelian boundary, in the general ...
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(2002)The Middle Carboniferous bryozoans of the Russian Platform are revised to extend the taxonomic composition of the bryozoan assemblage of the Moscovian Stage up to 55 species (five new) and 29 genera, belonging to 16 families, ...
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(1996)A study was made of Carboniferous deltaic deposits from Verkhoyan. The study was based on an analysis of the composition and typomorphic characteristics of the mineral parageneses in the deposits. This was accompanied by ...
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(2001)A carbon and sulfur isotope mass balance model has been constructed for calculating the variation of atmospheric O2 over Phanerozoic time. In order to obtain realistic O2 levels, rapid sediment recycling and O2-dependent ...
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(1995)It has been shown that molecular nitrogen (N2) in natural gas accumulations can result from thermal maturation of coal and other forms of sedimentary organic matter. The present paper investigates the loss of coal nitrogen ...
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(1989)The authors have discovered in the Katanga-Tetere interfluve extensive reserves of mordenite, produced by post-sedimentary transformation of ashy tuffs of intermediate composition. The particle-size distribution of the ash ...
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(2004)Morphological and histological aspects of conodont element regeneration are considered on the basis of material from the Late Devonian and Early Carboniferous. It is shown that the regeneration mechanism of conodonts ...
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(2001)The systematic position of a peculiar group of Angaran gymnosperms usually treated as "cordaites" is discussed. The systematics of these plants related to coniferophytes remains uncertain because of their extreme peculiarity. ...
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(2006)The Sentasi and the Wokensala intrusions are I type granites in west Zhungeer Sawuer region, Xinjiang. They are the partial alkali rocks and formed at the late of Early Carboniferous in the extendable period or compressible ...
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(2001)Three new species of Carboniferous brachiopods from the orders Spiriferida and Spiriferinida are described. There species belong to three different families: Anthracospirifer solenensis belongs to the Spiriferidae (subfamily ...
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(1985)Episodic volcanism favors, as shown by examples from Europe, the USA, and Brazil, the formation of organic-rich sediments (hydrocarbon source rocks). The examples examined from Europe comprise the Lower Carboniferous ...
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(2003)Paleomagnetic measurements were made on samples from Silurian, Devonian, Carboniferous and Permian aged rocks from the Omulevka terrane, northeast Russia. The Omulevka terrane is a fragment of continental margin that forms ...
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(1989)Gabbro-monzodiorite plutons in different parts of Mongolia are lumped together with the granitoid bodies intruding them into the gabbro-monzonite-granosyenite, monzonite-granosyenite-granite and other rock associations, ...
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(1998)Four new species of schwagerinids are described from the Carboniferous/Permian of the Fore-Urals (Perm Region): Rugosofusulina larga, R. gubachica (Rugosofusulinidae), Sphaeroschwagerina visherensis (Pseudoschwagerinidae), ...
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(2001)Three new schwagerinid species of the genus Praepseudofusulina, i.e., P. gemma, P. bullula, and P. arsenii, are described from the Upper Carboniferous (Gzhelian Stage, Daixina bosbytauensis-Globifusulina robusta Zone) of ...
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(1990)The silver-gold sulfide investigated by the authors, uytenbogaardtite, was discovered in part of a gold-bearing quartz vein in the oxidation zone of one gold-silver deposit in western Uzbekistan, where the primary ore is ...
Now showing items 41-60 of 120