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701.
We present some insight on the ionization structure of the circumstellar disks around Be type stars based on the study of
Balmer decrements for absorption-corrected emission lines. Owing to this analysis, three different ionization zones in the
envelope are proposed: the inner one, completely ionized, of about ∼ 5R*, an intermediate recombination zone extending up to ∼ [10 - 20]R*, and an outer extended zone of neutral H.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
702.
Using a recent determination of the X-ray luminosity function of galaxy clusters, accurate mass deposition rates and LX in cooling flow clusters from the literature, and reliable constraints on the star fomation episodes in cooling flows obtained
by our group, we quantify the relevance of such star formation in comparison with the SFR in the local universe. We conclude
that the SFR density in CF is ≲ 0.1% the total local reference.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
703.
This paper considers driven resonant nonlinear slow magnetohydrodynamic (MHD) waves in dissipative steady plasmas. A theory developed by Ruderman, Hollweg, and Goossens (1997) is used and extended to study the effect of steady flows on the nonlinear resonant behaviour of slow MHD waves in slow dissipative layers. The method of matched asymptotic expansions is used to describe the behaviour of the wave variables in the slow dissipative layer. The nonlinear analogue of the connection formulae for slow MHD waves obtained previously by Goossens, Hollweg, and Sakurai (1992) and Erdélyi (1997) in linear MHD, are derived. The effect of an equilibrium flow results partly in a Doppler shift of the available frequency for slow resonance and partly in the modification of the width of the dissipative layer. 相似文献
704.
M. J. López-González D. P. Murtagh P. J. Espy J. J. López-Moreno R. Rodrigo G. Witt 《Annales Geophysicae》1996,14(1):59-67
The temporal variation of OH* emission and weighted rotational temperature has been studied for high-latitude summer conditions. Observations for 60°N latitude show OH weighted temperatures that always exceed 145 K even during periods of noctilucent clouds. Using a one-dimensional model the effects in excited OH concentration produced by changes in temperature, eddy diffusion, and water concentration have been analysed. We are forced to conclude that there remains a discrepancy between the OH temperatures predicted by the model and that obtained from OH* measurements. An increase in OH* concentration from June to the beginning of August, followed by a slow decrease during August has been obtained in agreement with the measurements. The 16-day modulation present in the measurements was simulated in a simple manner by varying the temperature in the mesopause region. This variation produces periodic modulations in both OH* concentration and weighted temperature of 16 days. The results show the temperature leading the OH* column concentration by three days. This phase shift is also present in the observations. 相似文献
705.
706.
Prof. Dr. María E. de Civit Furlani Prof. Dr. María J. de Manchón Gutiérrez 《GeoJournal》1996,38(1):109-118
This article outlines three modalities of relation between literature and geography: the literary work as demonstrative element, the literary work as collective image, and the literary work as analogous process. The verification of the three modalities takes place through an approachment to the local literature using a geographical concept, namely region, and a particular area: the province of Mendoza, in western Argentina. Ten literary works of different genre were selected to which content analysis was applied. First the relevance of these representations at the initiation of geographical research is verified and then the way in which they stimulate the definition of problems and the formulation of hypotheses is addressed. 相似文献
707.
Nd and Sr isotopic data are reported for a granulite terrain in the Proterozoic Arunta Block of Central Australia. Sm-Nd data from a wide range of rock types define a crust formation age of 2,070±125 Ma and provide further evidence for voluminous crustal growth in the Proterozoic. An
Nd value of +1.5±0.8 indicates a depleted mantle source for this crustal segment and there is no evidence for a large component of significantly older sialic crust. Field relationships, geochemistry and Rb-Sr data for mafic and felsic granulites indicate that intracrustal differentiation and polyphase deformation were followed by granulite facies metamorphism (Rb depletion) at 1,800 Ma. Rb-Sr data for strongly retrogressed granulites define an age of 1,700 Ma which is interpreted as the time of retrograde biotite growth. Partial melting at the presently exposed crustal level and anatexis at deeper crustal levels were broadly coeval with the retrograde metamorphism. Sm-Nd and Rb-Sr isotopic systematics of minerals indicate that the terrain cooled slowly, did not experience significant uplift until 1,000 Ma and remained at temperatures above 320° C until the late Palaeozoic. The mineral data are consistent with geological relationships and petrological evidence for a prolonged period of isobaric cooling followed by uplift late in the metamorphic evolution of the terrain. The granulite protoliths appear to have formed in a rift which closed within 280 Ma of initial separation. Deformation and granulite facies metamorphism at 1,800 Ma are interpreted to be a consequence of collision between the continental blocks which defined the rift. Regional retrogression and granitoid magmatism at 1,700 Ma are attributed to underthrusting of the granulites by lower grade rocks in the final stages of collision. Subsequent events in the cooling and uplift history appear to have been controlled by the presence of long-lived major faults in the crust and a prolonged history of episodic compression in the continental lithosphere. The results of this study suggest that granulite terrains, in general, cannot be equated with lower continental crust but instead represent assemblages of (mainly) supracrustal rocks which in some instances have been involved in major collision events.Abbreviations
Opx
orthopyroxene
-
Cpx
clinopyroxene
-
Plag
plagioclase
-
Hb
hornblende
-
Ox
opaque oxide
-
Bi
biotite
-
Ap
apatite
-
Zir
zircon
-
Gt
garnet
-
2°CA
secondary clinoamphibole
-
Qtz
quartz
-
Ol
olivine
-
Sp
spinel
-
Se
serpentine
-
Ep
epidote
-
Kf
alkali feldspar
-
Mz
monazite
-
Sph
sphene
-
Sill
sillimanite
-
Rut
rutile
-
Cd
cordierite
-
Sphal
sphalerite
-
Ms
muscovite
-
Act
actinolite
-
Cc
calcite
-
Scap
scapolite
-
Cor
corundum
-
Xen
xenotime
-
Sapph
sapphirine
-
Ged
gedrite
-
All
allanite
-
Clh
clinohumite
-
Dol
dolomite
-
Mt
magnetite
-
Ghn
gahnite
-
Gal
galena 相似文献
708.
Dr. A. Embey-Isztin G. Dobosi Dr. G. Noske-Fazekas E. Árva-Sós 《Mineralogy and Petrology》1989,40(3):183-196
Summary A new occurrence of basalt (minimum K/Ar age 57.9 ± 2.2 m.y.) is reported from Budaliget, near Budapest. Major and minor element concentrations show that the basalts are alkaline and potassic in nature ranging from olivine tholeiite to moderately undersaturated basanite. High mg-values and concentrations of Ni and Cr indicate that some of the samples may represent primary compositions. High pressure accidental xenoliths, xenocrysts and cognate megacrysts are frequent and the chemical zoning patterns of olivine and pyroxene phenocrysts indicate a complex evolution and polibaric conditions for the crystallization. The discovery of the new basalt occurrence is important from a geodynamical point of view: prior to the last two major geodynamical events (Plio-Pleistocene rifting with associated alkali basaltic volcanism and collision of microplates with associated Miocene calk-alkaline volcanism) the continental lithosphere below NE Transdanubia may have experienced another rifting period in the Paleocene or Upper Cretaceous.With 7 Figures 相似文献
709.
Lawrence M. Anovitz Allan H. Treiman Eric J. Essene Bruce S. Hemingway Edgar F. Westrum Victor J. Wall Ramón Burriel Steven R. Bohlen 《Geochimica et cosmochimica acta》1985,49(10):2027-2040
Low temperature adiabatic calorimetry and high temperature differential scanning calorimetry have been used to measure the heat-capacity of ilmenite (FeTiO3) from 5 to 1000 K. These measurements yield S2980 = 108.9 J/(mol · K). Calculations from published experimental data on the reduction of ilmenite yield Δ2980(I1) = ?1153.9 kJ/(mol · K). These new data, combined with available experimental and thermodynamic data for other phases, have been used to calculate phase equilibria in the system Fe-Ti-O. Calculations for the subsystem Ti-O show that extremely low values of are necessary to stabilize TiO, the mineral hongquiite reported from the Tao district in China. This mineral may not be TiO, and it should be re-examined for substitution of other elements such as N or C. Consideration of solid-solution models for phases in the system Fe-Ti-O allows derivation of a new thermometer/oxybarometer for assemblages of ferropseudobrookite-pseudobrookitess and hematite-ilmenitess. Preliminary application of this new thermometer/oxybarometer to lunar and terrestrial lavas gives reasonable estimates of oxygen fugacities, but generally yields subsolidus temperatures, suggesting re-equilibration of one or more phases during cooling. 相似文献
710.
J. L. García Casquero N. A. I. M. Boelrijk J. Chacón H. N. A. Priem 《International Journal of Earth Sciences》1985,74(2):379-384
A Rb-Sr whole-rock investigation of suites of samples from two orthogneiss bodies in the Almendralejo area of the Oporto-Portalegre-Badajoz-Córdoba belt points to an Ordovician age for the granitic magmatism: about 470 Ma for the Almendralejo Gneiss (peralkaline metagranite) and about 425 Ma for the Ribera del Fresno Gneiss (leucocratic subaluminous metagranite), both with high initial87Sr/86Sr ratios. This points to a post-Ordovician (Hercynian) age for the metamorphism and tectonic deformation that affected the area, including the gneisses, and rules out the alleged Cadomian or even older age.
Zusammenfassung Die Rb-Sr-Gesamtgesteinsanalysen von Probeserien zweier orthogneisischer Körper der Almendralejo-Region des Oporto-Portalegre-Badajoz-Córdoba-Gürtels weisen auf ein ordovizisches Alter des granitischen Magmas hin: rund 470 Ma für den Almendralejo-Gneis (peralkaliner Metagranit) und rund 425 Ma für den Ribera del Fresno-Gneis (leukokratischer Metagranit), beide bei einem hohen initialen87Sr/86Sr. Diese Ergebnisse deuten auf ein post-ordovizisches (herzynisches) Alter der Metamorphose und der tektonischen Deformation hin, die das Gebiet, einschließ-lich des Gneises, beeinflußt haben. Sie schließen ein vermeintliches kadomisches oder älteres Alter aus.
Résumé Une étude par Rb-Sr sur roche totale de séries d'échantillons de deux massifs d'orthogneiss de la région d'Almendralejo, dans la ceinture Oporto-Portalegre-Badajoz-Cordoue, indique un âge ordovicien pour le magmatisme granitique: environ 470 Ma pour le gneiss d'Almendralejo (métagranite peralcalin) et environ 425 Ma pour le gneiss de Ribera del Fresno (métagranite leucocrate subalumineux), tous deux avec des rapports initiaux87Sr/86Sr élevés. Ces résultats indiquent un âge post-ordovicien (hercynien) pour le métamorphisme et la déformation tectonique qui ont affecté la région, y compris les gneiss, et éliminent l'hypothèse proposée par ailleurs d'un âge cadomien ou même plus ancien.
— — — Rb/Sr : 425 -- ( ) 470 ( ) 87Sr/86Sr . - ( ) , , . , .相似文献