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Browsing ELibrary by Title
Now showing items 7701-7720 of 21934
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(2001)Gases recovered from their location of formation (for example, gas recovered from drill cuttings) are enriched in C2+ components relative to gases recovered from reservoir production or testing streams. Because reservoir ...
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(2002)A new high-pressure polymorph of merrillite with the structure of trigonal γ-Ca3(PO4)2 was found in the shock-produced veins of the Suizhou meteorite, where it coexists with ringwoodite, majorite, NaAlSi3O8-hollandite, and ...
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(2002)Natural hydrofracturing caused by overpressure plays an important role in geopressure evolution and hydrocarbon migration in petroliferous basins. Its mechanism is quite well understood in the case of artificial hydraulic ...
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(2001)We present the first observations of natural mass-dependent fractionation of the isotopic composition of molybdenum (Mo), using multi-collector inductively coupled plasma mass spectrometry. Variations in the isotopic ...
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(2003)Knowledge of the formation conditions of Francevillian uranium and manganese ore deposits as well as natural fission reactors sheds light on the early evolution of the atmosphere between 1950 and 2150 Ma ago. The model ...
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(1999)A conceptual model for the adsorption of linear, flexible weak polyelectrolytes on oxide surfaces is applied to the adsorption and conformation of natural organic matter (NOM) on hematite. The polyelectrolytic nature of ...
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(1988)A study of the numerous primary microinclusions found in apatite crystals from the Mushugay-Khuduk carbonatite complex (Mongolia) established the presence of natural phosphate-sulfate melts and their basic characteristics. ...
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(2003)The oxidation rates of natural realgar and amorphous synthetic AsS by dissolved oxygen were evaluated using mixed flow reactors at pH 7.2 to 8.8 and dissolved oxygen contents of 5.9 to 16.5 ppm over a temperature range of ...
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(2004)Microbial and thermogenic methane migrates towards the seabed where some is utilised during microbially-mediated anaerobic oxidation. Excess methane escapes as gas seeps, which occur in a variety of geological contexts in ...
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(2005)The natural speciation of Mn (0.19 g/kg), Ni (46 mg/kg), and Zn (42 mg/kg) in the argillic horizon (120 cm depth, pH = 5.6) of an Ultisol from a paddy soil in northern Taiwan was investigated by advanced X-ray synchrotron ...
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(2004)Combined use of synchrotron-based X-ray fluorescence (SXRF), diffraction (XRD), and absorption (EXAFS) with an X-ray spot size as small as five micrometers allows us to examine noninvasively heterogeneous soils and sediments. ...
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(1989)There are reports of a potassic igneous rock complex that is new for the region west of Lake Ladoga and includes two facies - intrusive (hypabyssal) and diatreme-forming, with similar chemical and mineralogical composition. ...
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(2002)Multiple-collector inductively coupled plasma mass spectrometry has been used for the precise measurement of the isotopic composition of Se in geological samples. Se is chemically purified before analysis by using cotton ...
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(2003)Vaterite, a rare hexagonal CaCO3 Polymorph, was identified in precipitates forming at a supraglacial sulfur spring, in Borup Fiord Pass, northern Ellesmere Island, Canadian High Arctic. Vaterite occurs in a precipitate ...
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(2004)Eclogites from the Earth's mantle found in kimberlites provide important information on craton formation and ancient geodynamic processes because such eclogites are mostly Archean in age. They have equilibrated over a range ...
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(2001)The phenomenon of antiordering, i.e., preferred Al occupation of the T-2o position of the albite structure, was observed in a two-phase feldspar from Pektusan Volcano, Primorie. This paper reports the results of the computer ...
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(1988)The paper demostrates that the atmospheric glow phenomenon can be attributed to instability of droplets in a haze (or rain or drizzle) or thawed ice crystals (or rime) in an electric field. The instability results from an ...
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(1994)Using a data bank containing over 325 major-element analyses of biotite minerals from many localities around the world, it is demonstrated that biotite compositions depend largely upon the nature of magmas from which they ...
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(2000)Ophiolites and black shales cut by granitoids associate closely within the Ospino-Kitoi area of the Eastern Sayan. This object is unique in that the diverse rocks occurring in this territory including ultrabasic rocks, ...
Now showing items 7701-7720 of 21934