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Browsing ELibrary by Title
Now showing items 9226-9245 of 21936
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(1990)The problem of the heat source for island-arc volcanic activity is still unexplainable in the context of an assumed continuous subduction process. Adopting the general idea that the evolution of island-arc systems is an ...
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(1996)A set of modern marine sediments was analyzed to evaluate the role of sulfurization as a mechanism for biomarker preservation during early diagenesis. The set consisted of sediments accumulating within various oxic to ...
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(1987)Based on certain theoretical assumptions, the authors conducted surveys within the Daldyn kimberlite field, Daldyn-Alakit district, Yakutia, in the Udachnaya, the Dal'nyaya and the Zarnitsa pipes. A survey was conducted ...
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(2003)Phytol (the ester-linked side-chain of chlorophyll-a) is perhaps the most studied biomarker of those found in modern aquatic environments. This paper reviews recent studies of phytol degradation and provides an update on ...
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(2000)The Jurassic stratotype and reference sections in the Irkutsk basin located along the Angara River and its tributaries are studied along with remains of fossil plants sampled in the bed-by-bed manner. Paleobotanical data ...
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(1987)Picrite was found in outcrops as sills no thicker than one meter and with marginal chill zones. It is massive porphyritic rock with a dark-green to black color. Whitish phenocrysts of olivine and green, more euhedral ...
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(2004)The compositional structure of kimberlite fields is among the blank spots in the geology of kimberlite volcanism. Identification of pipe clusters within a kimberlite field is based on the geographic principle only, i.e., ...
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(2001)The classification of natural glasses as a principal problem is particularly related to pitchstone, obsidian and perlite. On the basis of more then 140 chemical and petrological analyses from both literature and own work ...
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(2002)Empirical rate equations such as R=k(1-c/ceq)n in the dissolution of minerals are common in nature, e.g. limestone. The quantity c is the concentration of a major ion contained in the mineral, and ceq its concentration at ...
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(2002)The development of outgrowths or pits of various shapes on coated grains is explained via a quantitative model of grain growth/dissolution kinetics coupled to evolving grain geometry (morphological dynamics). Grain-coating ...
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(2002)Previous studies from PKP(AB–DF) differential travel times at large distances suggest that the central part of the inner core is very anisotropic. These differential times, however, can be affected greatly by strong ...
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(2004)Study is given to association of PGE minerals from the Maior Brook placer in the Filippa zoned massif of the Ural-Alaskan type. The massif rocks feeding placers (dunites, wehrlites, and clinopyroxenites) are seriously ...
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(2001)Assimilation experiments have been performed using a crustal contaminant and several basaltic compositions in order to study the morphologies of plagioclase crystals produced in the course of the assimilation reactions. A ...
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(2003)The lattice preferred orientation (LPO) of an anorthosite (composed of andesine) sampled from a highly deformed anorthositic mylonite (Grenville Province, Quebec) was measured by TOF neutron diffraction and SEM-EBSD. The ...
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(2002)Plagioclase-rich chondrules (PRCs) in the reduced CV chondrites Efremovka, Leoville, Vigarano and Grosvenor Mountains (GRO) 94329 consist of magnesian low-Ca pyroxene, Al-Ti-Cr-rich pigeonite and augite, forsterite, ...
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(2004)The aim of this work within the WP 3.1 of the COST 271 Action is the characterization of the variability introduced in the F-region ionosphere by -Planetary Wave Signatures- (PWS) and -Gravity Wave Signatures- (GWS). Typical ...
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(2003)The past several years have seen dramatic developments in the study of planetary magnetic fields, including a wealth of new data, mainly from the Galilean satellites and Mars, together with major improvements in our ...
Now showing items 9226-9245 of 21936