Browsing ELibrary by Title
- DSpace Home
- →
- Геология России
- →
- ELibrary
- →
- Browsing ELibrary by Title
JavaScript is disabled for your browser. Some features of this site may not work without it.
Browsing ELibrary by Title
Now showing items 12606-12625 of 21934
-
(1995)We report the results of an ion probe study of rare earth elements (REEs) in six unequilibrated enstatite chondrites. Oldhamite is confirmed as the major but not the only REE carrier in these meteorites. Data are also ...
-
(2003)The detailed examination of meteorites and interplanetary dust particles provides an opportunity to infer the origin of the organic matter found in primitive Solar System materials. If this organic matter were produced by ...
-
(1996)The meteorites of the Solar System can be divided into heliocentric and planetocentric. The heliocentric meteorites originated in the asteroid belt while the origin of the planetocentric meteorites is associated with the ...
-
(1997)We report results from an experimental study of sulfide chemistry during metamorphism on ordinary chondrite parent bodies. Artificial LL-chondrite material, composed of silicate, iron metal, and sulfide grains, was placed ...
-
(2000)The reasons for the similarity of the depleted abundances of V, Cr and Mn in the mantles of the Earth and Moon, which may throw light on the origin of the Moon, have been controversial. In order to test if a single-stage ...
-
(2003)Origin of the eukaryotic organisms (including the multicellular animals or Metazoa) is commonly considered to be related to growing oxygen content in the atmosphere up to a level that allows aerobic metabolism. Here it is ...
-
(1996)Previous investigations of the δ18O of the skeletons of Florida specimens of the reef coralMontastraea annularis have failed to produce the full temperature range suggested by calibration studies of other corals. Explanations ...
-
(1996)This study examines the relationship between the δ13C of the skeleton of a zooxanthellate coral (Montastraea annularis) growing on the Florida Reef Tract and environmental variables (insolation and temperature), physiological ...
-
(2003)As inferred from numerous available seismostratigraphic and lithological data [1, 2, and others], Phanerozoic epeiric seas experienced frequent and significant water-depth changes. Identification of regularities in these ...
-
(2002)Organic forms of nitrogen are widespread in the atmosphere and their deposition may constitute a substantive input of atmospheric N to terrestrial and aquatic ecosystems. Recent studies have expanded the pool of available ...
-
(2001)Some background information and few remarks of introduction are in order. Alfred Wegener hadthe broadest interests, having studied physics, meteorology and astronomy, but not especially geol-ogy, he mostly worked on ...
-
(1986)Pb, Nd and Sr isotopic compositions are reported for ultrapotassic rocks from a variety of tectonic settings. Olivine leucitites located within the Palaeozoic Lachlan Fold Belt of southeastern Australia have a range in ...
-
(1997)Owing to the association with diamonds, eclogite xenoliths have received disproportionate attention given their low abundance in kimberlites. Several hypotheses have been advanced for the origin of eclogite xenoliths, from ...
-
(1999)A detailed study was made of the oceanic 187Os/186Os variation through the Cenozoic by using a hydrogen peroxide leaching procedure on a pelagic clay core from the North Pacific (Long Lines-44 GPC3). A 6% H2O2 solution was ...
-
(1999)The osmium concentration ([Os]) and isotopic composition were determined in a set of 17 of the largest rivers of the world. [Os] varies between 4.6 and 52.1 pg/kg and the 187Os/188Os ratio varies between 0.64 and 2.94. ...
-
(2004)The oxidation of carbonate green rust, GR(CO32−), in NaHCO3 solutions at T = 25°C has been investigated through electrochemical techniques, FTIR, XRD, TEM and SEM. The used GR(CO32−) samples were made of either suspended ...
-
(1999)The oxidation rate of pyrite at pH 7, 25°C and at constant partial pressure of oxygen (0.21 and 0.177 atm) was measured in the presence of the Fe(III)-chelators NTA, oxalate, leucine, EDTA, citrate, IDA and the Fe(III)-reductant ...
-
(2002)The dependence of the ferric-ferrous ratio in silicate melts on oxygen fugacity was studied in the system SiO2(Qz)-NaAlSi3O8(Ab)-CaAl2Si2O8(An)-H2O using Mossbauer spectroscopy. Experiments were performed under water-saturated ...
-
(1985)Olivine leucitites from the Gaussberg volcano, Antarctica are primitive members of the lamproite group of ultrapotassic rocks. They are glass rich, have an Mg number of around 70, and carry spinel lherzolite xenoliths. ...
-
(1992)The oxygen fugacities of 48 mantle xenoliths from 5 localities in southern Siberia (USSR) and Mongolia have been determined. Ferric iron contents of spinels were measured by 57Fe Mssbauer spectroscopy and oxygen fugacities ...
Now showing items 12606-12625 of 21934