Results 101 to 110 of about 29,586 (208)

COMPOSITIONAL AND PETROGENETIC FEATURES OF SCHISTOSE ROCKS OF IBADAN AREA, SOUTHWESTERN NIGERIA

Earth Sciences Research Journal, 2009
Amphibole and quartz schist which occur in association with migmatite gneiss, granitic gneiss and Pan African Older Granitebodies around Ibadan area, southwestern Nigeria, were studied with a view to elucidate their compositional characteristics andtheir
Oluwatoke O.O., Adeigbe O.C., Okunlola O.A.   +2 more
doaj  

Phyllosilicate Transitions in Ferromagnesian Soils: Short-Range Order Materials and Smectites Dominate Secondary Phases [PDF]

Analyses of X-ray diffraction (XRD) patterns taken by the CheMin instrument on the Curiosity Rover in Gale crater have documented the presence of clay minerals interpreted as smectites and a suite of amorphous to short-range order materials termed X-ray ...
Azua, B., Feldman, A. D., Hausrath, E. M., Peretyazhko, T. S., Rampe, E. B., Tschauner, O.   +5 more
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Experimental phase equilibria constraints on pre-eruptive storage conditions of the Soufreiere Hills magma [PDF]

, 1998
Aspinall, Devine, Devine, Devine, Donovan, Fine, Geschwind, J. Barclay, J. D. Devine, J. Gardner, M. D. Murphy, M. J. Rutherford, M. R. Carroll, Martel, Moore, Moore, Murphy, Newman, R. S. J. Sparks, Rutherford, Young, Young   +21 more
core   +1 more source

Stability of Actinolite on Venus [PDF]

Venus currently has a hostile surface environment with temperatures of ~460 C, pres-sures near 92 bars, and an atmosphere composed of super critical CO2 hosting a myriad of other potentially reactive gases (e.g., SO2, HCl, HF).
Doehne, C. J., Graham, A. R., Lew-is, J. A., McCubbin, F. M., Moore, G., Morris, R. V., Phillips, K., Rymut, J. E., Santos, A. R., Tu, V. M., Vander Kaaden, K. E.   +10 more
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Thermobarometric studies on the Levack Gneisses: Footwall rocks to the Sudbury Igneous Complex [PDF]

Granulite and amphibolite facies gneisses and migmatites of the Levack Gneiss Complex occupy a zone up to 8 km wide around the northern part of the Sudbury Igneous Complex (SIC).
James, R. S., Peredery, W., Sweeny, J. M.   +2 more
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The Mountain Pass Rare-Earth Deposits [PDF]

, 1954
Rare-earth minerals were discovered near Mountain Pass in northeastern San Bernardino County, Calif., in April 1949, and in the following year the Sulphide Queen carbonate body was found.
Olson, J. C., Pray, L. C.
core  

Early Cretaceous Surtseyan volcanoes of the Baño Nuevo Volcanic Complex (Aysén Basin, Eastern Central Patagonian Cordillera, Chile)

Geologica Acta, 2010
Tens of Surtseyan tuff cones are exposed in the Río Coichel valley, between Ñireguao and Estancia Baño Nuevo (Southern Chilean Andes). The Early Cretaceous products of the submarine eruptions rest on, or are interbedded with, shallow marine sandstones of
A. DEMANT, M. SUÁREZ, R. DE LA CRUZ, O. BRUGUIER   +3 more
doaj  

Geomechanical models of impact cratering: Puchezh-Katunki structure [PDF]

Impact cratering is a complex natural phenomenon that involves various physical and mechanical processes. Simulating these processes may be improved using the data obtained during the deep drilling at the central mound of the Puchezh-Katunki impact ...
Ivanov, B. A.
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The 1983-84 Suspensions of EDB Under FIFRA and the 1989 Asbestos Ban and Phaseout Rule Under TSCA: Two Case Studies in EPA's Use of Science [PDF]

This paper discusses EPA's acquisition and use of science in a decision under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA): the 1983-84 suspensions of ethylene dibromide (EDB); and in a decision under the Toxic Substances Control Act ...
Powell, Mark
core  

The Cretaceous-Tertiary (K/T) impact: One or more source craters? [PDF]

The Cretaceous-Tertiary (K/T) boundary is marked by signs of a worldwide catastrophe, marking the demise of more than 50 percent of all living species. Ever since Alvarez et al.
Koeberl, Christian
core   +1 more source