Zobrazeno 1 - 10
of 46
pro vyhledávání: '"O. A. SCHAEFFER"'
Publikováno v:
Annals of the New York Academy of Sciences. 119:347-350
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2c3e1c11276835ea72b664bfbefac63a
https://doi.org/10.1111/j.1749-6632.1965.tb47444.x
https://doi.org/10.1111/j.1749-6632.1965.tb47444.x
Publikováno v:
Geophysical Research Letters. 5:219-222
Concentrations of argon-39 produced by cosmic rays in the metal in 30 meteorites are remarkably similar, but they are slightly higher than expected for the present solar-cycle-averaged flux of cosmic rays. This supports the idea suggested by Eddy (19
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d37a10d93e47002f251576d8abfdc51f
https://doi.org/10.1029/gl005i003p00219
https://doi.org/10.1029/gl005i003p00219
Autor:
O. A. Schaeffer, G. Heusser
Publikováno v:
Earth and Planetary Science Letters. 33:420-427
Cosmic-ray-produced 37 Ar ( t 1/2 = 35 days), and 39 Ar ( t 1/2 = 269 years) in the Fe-Ni phase of meteorites have been studied in connection with their implications for the radial gradient of cosmic ray particles. For the chondrite, Can˜on City, wh
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::99238110bf11ef4ef2291c4e98681682
https://doi.org/10.1016/0012-821x(77)90093-0
https://doi.org/10.1016/0012-821x(77)90093-0
Publikováno v:
Earth and Planetary Science Letters. 31:358-368
The crystallization ages of a suite of Apollo 17 basalts from four different stations have been measured using the Ar-39 to Ar-40 stepwise heating technique. The rocks analyzed include all principal petrographic types found at Apollo 17 landing site.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c3556c004c86d6dee1dc8b1fc86cd781
https://doi.org/10.1016/0012-821x(76)90117-5
https://doi.org/10.1016/0012-821x(76)90117-5
Publikováno v:
Planetary and Space Science. 29:1109-1118
The space erosion of stony meteorites has been determined to be 650μm 106y−1, while that of iron meteorites has been determined to be 22 μm 106y−1. The erosion rates are based on flux and size distributions of small particles in the solar syste
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6be9f26c0467428dffc78045a06f7ea0
https://doi.org/10.1016/0032-0633(81)90010-6
https://doi.org/10.1016/0032-0633(81)90010-6
Autor:
William C. Burnett, O. A. Schaeffer
Publikováno v:
Estuarine and Coastal Marine Science. 11:605-611
In order to evaluate the influence of the ocean dumping of sewage sludge upon the organic carbon fraction of sediments of the New York Bight, a study of carbon isotopic variations in surface sediments from the area has been completed. On the basis of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::38e0ff8b6a5fbc2a2b9401a168ff1dc8
https://doi.org/10.1016/s0302-3524(80)80013-2
https://doi.org/10.1016/s0302-3524(80)80013-2
Autor:
Liaquat Husain, O. A. Schaeffer
Publikováno v:
Geophysical Research Letters. 2:29-32
From a stepwise-heating experiment on neutron-irradiated samples of whole rock and a plagioclase separate, an Ar-40/Ar-39 age of 4.26 plus or minus 0.02 G.y. was determined for the Apollo 17 troctolite 76535. This rock is believed to have formed as a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::54eadffba9b67bbfaeb6ad422d9dacdc
https://doi.org/10.1029/gl002i001p00029
https://doi.org/10.1029/gl002i001p00029
Autor:
O. A. Schaeffer
Publikováno v:
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences. 285:137-143
We have heard earlier in this Discussion Meeting that from the systematics of Sr and Pb isotopes in lunar samples, it is possible to ascertain that the Moon had a solid crust about 4.6 Ga ago, that is, very soon after the formation of the solar syste
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::341e49e2dd917009e4ea667781960752
https://doi.org/10.1098/rsta.1977.0049
https://doi.org/10.1098/rsta.1977.0049
Autor:
O A Schaeffer
Publikováno v:
Annual Review of Physical Chemistry. 13:151-170
A review is presented of the radioactive and stable nuclides produced in meteorites by cosmic rays. The question of constancy of cosmic rays in time and space is considered along with the exposure ages of meteorites. (D.L.C.)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::09f4614d74cea861bfeeab917285373d
https://doi.org/10.1146/annurev.pc.13.100162.001055
https://doi.org/10.1146/annurev.pc.13.100162.001055
Autor:
O. A. Schaeffer, D. Heymann
Publikováno v:
Journal of Geophysical Research. 70:215-224
The cosmic ray exposure ages of six octahedrites and of the iron phase of one mesosiderite have been measured. Five of these meteorites are dated falls. From the results there is support for our previous suggestion of two major collisions in space, o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ae640943a70c0aa45af77cf2f694384b
https://doi.org/10.1029/jz070i001p00215
https://doi.org/10.1029/jz070i001p00215