Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Planets, study

Ferguson E E, Fehsenfeld F C, Dunkin D B, Schmeltekopf A L and Schiff FI I 1964 Laboratory studies of helium ion loss processes of interest in the ionosphere Planet Space Scl. 12 1169-71... [Pg.825]

Thus, astronomers also suffer from the three-body problem when they try to study the motion of the planets round the sun. They are lucky in that the gravitational force between bodies A and B goes as... [Pg.109]

Pressure-induced phase transitions in the titanium dioxide system provide an understanding of crystal structure and mineral stability in planets interior and thus are of major geophysical interest. Moderate pressures transform either of the three stable polymorphs into the a-Pb02 (columbite)-type structure, while further pressure increase creates the monoclinic baddeleyite-type structure. Recent high-pressure studies indicate that columbite can be formed only within a limited range of pressures/temperatures, although it is a metastable phase that can be preserved unchanged for years after pressure release Combined Raman spectroscopy and X-ray diffraction studies 6-8,10 ave established that rutile transforms to columbite structure at 10 GPa, while anatase and brookite transform to columbite at approximately 4-5 GPa. [Pg.19]

Recent space-probe and earth-based spectroscopic studies of the planet Venus suggest how much remains to be learned about the other planets. Earlier estimates of the surface temperature of Venus placed it near 60°C. The more detailed studies show, however, that two characteristic temperatures can be identified, —40°C and 430°C. The lower temperature is attributed to light emitted front high altitude cloud tops. The higher temperature is likely to be the average surface temperature. [Pg.445]

A collision with a Mars-sized object may have resulted in the formation of the Earth s moon. Our moon is by no means the largest satellite in the solar system, but it is unusual in that it and the moon of Pluto are the largest moons relative the mass of the planets they orbit. Geochemical studies of returned lunar samples have shown that close similarities exist between the bulk composition of the moon and the Earth s mantle. In particular, the abimdances of sidero-... [Pg.24]

Overall, the Earth is unique compared to any other planet we know of in its remarkable perfection in supporting life. The integrated systems that allow this to happen started with events occurring billions of years ago. Keeping this historical perspective in mind while studying present-day Earth systems will help complete the picture of the planet. [Pg.28]

Studies in chemistry or any realm of science commonly consist of a series of directed examinations of parts of nature s realm called systems. A system is an identifiable fragment of the world that is recognizable and that has attributes that one can identify in terms of form and/or function. We can give examples at any level of size and complexity and in essentially any context. Indeed, a dog is a system at a pet show whereas the human heart is a system to the cardiologist a tumor cell is a system to the cancer specialist a star or planet or galaxy is a system to an astronomer a molecule or a collection of molecules is a system to a chemist and an atom or group of atoms is a system to a physicist. A system is, then, whatever we focus our attention upon for study and examination. [Pg.3]

Beattie P (1993a) The generation of uraiuum series disequilibria by partial melting of spinel peridotite Constraints from partitioiung studies. Earth Planet Sci Lett 117 379-391... [Pg.119]

Jones JH (1995) Experimental trace element partitioning. In Ahrens TJ (ed) Rock physics and phase relations A handbook of physical constants Am Geophys Union Reference Shelf 3 73-104 Kennedy AK, Lofgren GE, Wasserburg GJ (1993) An experimental study of trace element partitioning between olivine orthopyroxene and melt in chondrales equilibrium values and kinetic effects. Earth Planet Sci Lett 115 177-195... [Pg.122]

Schmidt KH, Bottazzi P, Vannucci R, Mengel K (1999) Trace element partitioning between phlogopite, clinopyroxene, and leucite lamproite melt. Earth Planet Sci Lett 168 287-299 Shaimon RD (1976) Revised effetive ionic radii and systematic studies of interatomic distances in halides and chalcogenides. Acta Cryst A32 751-767... [Pg.123]

Lnndstrom CC, Gill J, Williams Q, Hanan BB (1998a) Investigating solid mantle upwelling beneath midocean ridges using U-series disequilibria. II. A local study at 33°S Mid-Atlantic Ridge. Earth Planet Sci Lett 157 167-181... [Pg.209]

O Hara MJ (1968) The bearing of phase equilibria studies in synthetic and natural systems on the origin and evolution of basic and ultrabasic rocks. Earth Sci Rev 4 69-133 O Nions RK, McKenzie D (1993) Estimates of mantle thorium/uranium ratios from Th, U and Pb isotope abundances in basaltic melts. Phil Trans Royal Soc 342 65-77 Oversby V, Gast PW (1968) Lead isotope compositions and uranium decay series disequilibrium in reeent volcanic rocks. Earth Planet Sci Lett 5 199-206... [Pg.210]

Olafsson M, Eggler DH (1983) Phase relations of amphibole, amphibole-carbonate, and phlogopite-carbonate peridohte petrologic constraints on the asthenosphere. Earth Planet Sci Lett 64 305-315 Olson P, Schubert G, Anderson C, Goldman P (1988) Plume formahon and lithosphere erosion a comparison of laboratory and numerical experiments. J Geophys Res 93 15065-15084 Pearson DG, Shirey SB, Carlson RW, Boyd FR, Nixon PH (1995) Stabilisahon of Archean lithospheric manhe A Re-Os isotope isotope study of peridohte xenoliths. Earth Planet Sci Lett 134 341-357... [Pg.246]

Sigmarsson O, Condomines M, Fomcade S (1992) A detailed Th, Sr and O isotope study of Hekla differentiation processes in an Icelandic Volcano. Contrib Mineral Petrol 112 20-34 Sigmarsson O, Condomines M, Fourcade S (1992) Mantle and crustal contribution in the genesis of recent basalts from off-rift zones in Iceland constraints from Th, Sr and O isotopes. Earth Planet Sci Lett 110 149-162... [Pg.247]

Vigier N, Bourdon B, Joron J-L, Allegre CJ (1999) U-Th-Ra disequilibria in Ardoukoba tholeiitic basalts (Asal rift) timescales of ciystallization. Earth Planet Sci Lett 174 81-98 Watson S, McKenzie D (1991) Melt generation by plumes a study of Hawaiian volcanism. J Petrol 32 501-537... [Pg.247]

Chappell J (1974) Geology of coral terraces, Huon Peninsula, New Gttinea A study of (Quaternary tectonic movements and sea-level changes. Geol Soc Am Bttll 85 553-570 Chappell J (1996) Reconciliation of late (Quaternary sea levels derived from coral terraces at Huon Peninsttla with deep sea oxygen isotope records. Earth Planet Sci Lett 141 227-236... [Pg.400]

Harmon RS, Schwarcz HP, O Neil JR (1979) D/H ratios in speleothem fluid inclusions A grride to variatiorrs in the isotopic compositions of meteoric precipitation Earth Planet Sci Lett 42 254-266 Harmon RS, Thompson P, Schwarcz HP, Ford DC (1975a) Late Pleistocene paleoclimates of North America as irrferred from stable isotope studies of speleothems. Quat Res 9 54-70 Harmon RS, Thompson P, Schwarcz HP, Ford DC (1975b) Uranium-series dating of speleothems. Nat Speleolo cal Soc Bull 37 21-33... [Pg.455]

Kharkar DP, Thomson J, Turekian KK, Forster WO (1976) Uranium and thorium series nuclides in plankton from the Caribbean. Limnol Oceanogr 21 294-299 Krishnaswami S, Lai D, Somayajulu BLK, Weiss R, Craig H (1976) Large-volume in situ filtration of deep Pacific waters mineralogical and radioisotope studies. Earth Planet Sci Lett 32 420-429 Livingston HD, Cochran JK (1987) Determination of transuranic and thorium isotopes in ocean water in solution and in filterable particles. J Radioanal Nucl Chem 115 299-308 Masque P, Sanchez-Cabeza JA, Braach JM, Palacios E, Canals M (2002) Balance and residence times of °Pb and 4 o in surface waters of the northwestern Mediterranean Sea. Cont Shelf Res 22 2127-2146 Matsumoto E (1975) Th-234-U-238 radioactive disequilibrium in the surface layer of the oceans. Geochim Cosmochim Acta 39 205-212... [Pg.490]

Krishnaswami S, Lai D, Somayajulu BLK (1976) Large-volume in-situ filtration of deep Pacific waters Mineralogical and radioisotope studies. Earth Planet Sci Lett 32 420-429 Krishnaswami S, Mangini A, Thomas JH, Sharma P, Cochran JK, Turekian KK, Parker PD (1982) °Be and Th isotopes in manganese nodules and adjacent sediments nodule growth histories and nuclide behavior. Earth Planet Sci Lett 59 217-234... [Pg.526]

Marcantonio F, Anderson RF, Higgins S, Stute M, Schlosser P, Kubik PW (2001b) Sediment focusing in the central equatorial Pacific Ocean. Paleoceanography 16(3) 260-267 Marcantonio F, Kumar N, Stute M, Anderson RF, Seidl MA, Schlosser P, Mix A (1995) A comparative study of accumulation rates derived by He and Th isotope analysis of marine sediments. Earth Planet. Sci. Letters 133 549-555... [Pg.527]

Thiel K, Vorwerk R, Saager R, Stupp HD (1983) U fission tracks and U-series diseqttilibria as a means to study recent mobilization of ttranittm in archean pyritic conglomerates. Earth Planet Sci Lett 65 249-262... [Pg.575]

See other pages where Planets, study is mentioned: [Pg.17]    [Pg.3872]    [Pg.175]    [Pg.17]    [Pg.3872]    [Pg.175]    [Pg.28]    [Pg.76]    [Pg.440]    [Pg.632]    [Pg.116]    [Pg.1]    [Pg.5]    [Pg.11]    [Pg.1322]    [Pg.35]    [Pg.153]    [Pg.155]    [Pg.53]    [Pg.575]    [Pg.3]    [Pg.19]    [Pg.121]    [Pg.170]    [Pg.173]    [Pg.173]    [Pg.175]    [Pg.208]    [Pg.245]    [Pg.527]   
See also in sourсe #XX -- [ Pg.1707 ]



SEARCH



Planets

© 2024 chempedia.info