Zobrazeno 1 - 9
of 9
pro vyhledávání: '"C. H. Simonds"'
Autor:
C. H. Simonds, Susan W. Kieffer
Publikováno v:
Journal of Geophysical Research: Solid Earth. 98:14321-14337
The controversy that raged through the 1950s to 1970s over similarities and differences between meteorite impact and volcanic processes is revisited. We propose that there are quantitative similarities in erosion caused by high-speed ejecta produced
Autor:
G. W. Pearce, C. H. Simonds
Publikováno v:
Journal of Geophysical Research. 79:2953-2959
The Apollo 16 crystalline rocks have a greater average percentage of metallic iron than any other lunar material and are the most reduced in terms of their metallic iron/total iron ratio. They have greater metal content than the mare basalts, the onl
Autor:
R. J. Floran, C. H. Simonds, M. R. Dence, J. L. Warner, W. C. Phinney, R. A. F. Grieve, M. J. Rhodes, Bor-ming Jahn
Publikováno v:
Geophysical Research Letters. 3:49-52
Chemical, petrographic, isotopic and field studies of igneous-textured rocks within the Manicouagan structure indicate that they are the product of impact melting. Features of the melt sheet include a high degree of textural variation combined with c
Publikováno v:
Journal of Geophysical Research. 83:2773
It is suggested, on the basis of previous theoretical studies of shock waves, that the Manicouagan melt formed in 1 or 2 s in a 5-km-radius hemisphere near the point of impact. The melt and the less shocked debris surrounding it flowed downward and o
Publikováno v:
Geophysical Research Letters. 10:599-599
Autor:
Susan W. Kieffer, C. H. Simonds
Publikováno v:
Reviews of Geophysics. 18:143
A survey of published descriptions of 32 of the largest, least eroded terrestrial impact structures shows that the amount of melt at craters in crystalline rocks is approximately two orders of magnitude greater than that at craters in sedimentary roc
Publikováno v:
Journal of Geophysical Research. 83:2799
Rb-Sr isotopic data for mineral separates from a rock of the Manicouagan impact melt sheet define an isochron of age T = 214 + or - 5 (2 sigma) m.y. which agrees with the K-Ar age of 210 + or - 8 (2 sigma) calculated by Wolfe (1971). The initial Sr-8
Publikováno v:
Journal of Geophysical Research. 83:2789
Calculations for the heat transfer between superheated silicate melt and evenly dispersed 1-mm cold clasts indicate that most of the thermal gradients are smoothed out in 100 s and that the rate of equilibrium is sufficiently high so that clasts whos