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Now showing items 12297-12316 of 39126
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(2002)Analyses of REE were conducted on phosphatic concretions and various types of associated organic matter in eight, key latest Neoproterozoic–earliest Cambrian, inner- to outer-shelf, marine phosphatic successions that are ...
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(1987)Rare earth element (REE) patterns of plutonic rocks across the Cretaceous Peninsular Ranges batholith vary systematically west to east, transverse to its long axis and structural trends and generally parallel to asymmetries ...
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(2001)The adsorption experiments of rare-earth elements (REE) onto δ-MnO2 and Fe oxyhydroxide precipitates suspended in aqueous NaCl solutions have been conducted. The distribution coefficients, Kd(REE: precipitate/solution) ...
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(2000)This is a report of the first unambiguous discovery of rare earth elements (REE) in iron sulfide (FeS) in an ordinary chondrite. The content and the pattern of REE as well as the reduced state of the chondrules with the ...
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(1998)Carbonatites from the Khibina Alkaline Massif (360–380 Ma), Kola Peninsula, Russia, contain one of the most diverse assemblages of REE minerals described thus far from carbonatites and provide an excellent opportunity to ...
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(2002)A newly compiled global reef database indicates that the 5–6 Myr long Frasnian (Late Devonian) metazoan reef episode had relatively low diversity compared to Middle Devonian highs (with over 200 genera of calcitic rugose ...
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(2001)In this study we focus on precise lead isotope analysis by thermal ionization mass spectrometry (TIMS) with silica gel technique. We present extensive measurements of SRM981 and SRM982 standards, of chemically pure Pb and ...
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(2002)The paper presents the results of long-term complex investigation of lacustrine and fluvial-lacustrine sediments in the Baturino coal quarry (Chelyabinsk district, south Transurals region). Three units, the Chumlyak (lower ...
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(1999)A reference section of the Upper Permian deposits of the Tethyan basin in southeastern Mongolia is defined. The brachiopod zonation of the deposits is described. Two zones corresponding to one transgressive phase are united ...
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(1999)Materials of geological, paleontological (small mammals and freshwater mollusks), paleopedological, palynological, paleomagnetic and magnetic studies are considered to characterize the Log Krasnyi loess-and-soil formation ...
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(2000)This paper describes an effort in developing reference systems to be used in high temperature subcritical and supercritical aqueous solutions for assessing the viability and accuracy of high-temperature pH sensors. Each ...
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Refined magnetostratigraphic position of the Shyrokyne unit in loess sequences from Central Ukraine (Днепропетровский национальный университет им. Олеся Гончара, 2019)The youngest geomagnetic polarity reversal, the Matuyama–Brunhes boundary (MBB), which occurred 780 kyr ago, is a “golden spike” in the age calibration of sediment sequences. The use of palaeomagnetic method as a stratigraphic ...
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(2004)The aim of this paper is to determine a relationship between the wavenumbers of the first OH-stretching overtones (W2OH) and the wavenumbers of the OH-stretching fundamentals (WOH) to help to interpret the near-infrared ...
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(1997)A large and representative collection of clay-size dioctahedral mica minerals differing in their chemical compositions has been studied by infrared (IR) spectroscopy in the OH stretching vibration region. Decomposition of ...
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(1997)A new model for the interpretation of dioctahedral mica infrared (IR) spectra in the OH stretching vibration region is proposed. It is based on the analysis of the main factors responsible for the observed sequence of the ...
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(2004)In the analysis of petroleum reservoirs, one of the most challenging problems is to use inverse theory in the search for an optimal parameterization of the reservoir. Generally, scientists approach this problem by computing ...
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REFINING GONDWANA AND PANGEA PALAEOGEOGRAPHY: ESTIMATES OF PHANEROZOIC NON-DIPOLE (OCTUPOLE) FIELDS (2002)Reliable Phanerozoic paleopoles have been selected from the stable parts of the Gondwana continents and, upon appropriate reconstruction, have been combined in an apparent polar wander (APW) path, which can be compared ...
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(1998)The eustatic component of relative sea-level change provides a measure of the amount of ice transferred between the continents and oceans during glacial cycles. This has been quantified for the period since the Last Glacial ...
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(2005)We report isotope analyses of helium, neon, argon, and xenon using different extraction techniques such as stepwise dynamic and static crushing, and high-resolution stepwise heating of three mantle xenoliths from Réunion ...
Now showing items 12297-12316 of 39126