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  • 1
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    Rare gases from stepwise heating of lunar rock 12013 (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: He, Ne, Ar and Xe from stepwise heating of Apollo 12 lunar rock 12013, discussing radiogenic and spallation components and He 3 and Ne 21 cosmic ray exposure ages
    Keywords: SPACE SCIENCES
    Type: ; ADEMIE DES SCIENCES
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  • 2
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    Noble gases and the early history of the Earth: Inappropriate paradigms and assumptions inhibit research and communication (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The development of models as tracers of nobel gases through the Earth's evolution is discussed. A new set of paradigms embodying present knowledge was developed. Several important areas for future research are: (1) measurement of the elemental and isotopic compositions of the five noble gases in a large number of terrestrial materials, thus better defining the composition and distribution of terrestrial noble gases; (2) determinations of relative diffusive behavior, chemical behavior, and the distribution between solid and melt of noble gases under mantle conditions are urgently needed; (3) disequilibrium behavior in the nebula needs investigation, and the behavior of plasmas and possible cryotrapping on cold nebular solids are considered.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Inst. Workshop on the Early Earth: The Interval from Accretion to the Older Archean; p 37-38
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  • 3
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    Non-atmospheric noble gases from CO(sub 2) well ga (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: In recent years a number of studies of both terrestrial and extraterrestrial material has allowed the piecing together of a picture of events occurring in the early solar system (4.5 Gyr ago), including the formation of the earth. However, before this picture can be completed with an appropriate amount of detail it will be necessary to make further advances. One of the areas where knowledge is lacking is the chemical and isotopic composition of the earth as a whole. The lack of knowledge has less to do with the capabilities of modern techniques than with the availability of samples to study. About 99.6 percent of the earth's mass is contained in the mantle and core, leaving less that 1 percent in the crust and atmosphere. Although the crust is derived from the mantle it has undergone extensive changes and it is therefore difficult (although not impossible) to use crustal material to study events occurring 4.5 Gyr ago. More information about the early earth could be obtained from studies of the mantle but it is difficult to obtain mantle material, because the mean thickness of the crust is 17 km, much greater than even the deepest mines or drill shafts. The two types of available mantle samples are discussed.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Nineteenth Lunar and Planetary Science Conference. Press abstracts; p 8-9
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  • 4
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    Argon-40-argon-39 dating of Apollo sample 15555. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An age of 3.33 (plus or minus 0.05) b.y. was obtained for Apollo 15 sample 15555 by argon-40-argon-39 dating. The age of rock 15555, a basalt from the rim of Hadley Rille, establishes an upper limit to the age of the rille. The basalt flows filling the Hadley Rille section of the Imbrium basin postdate the formation of the basin - as measured by the Apollo 14 samples of the Fra Mauro formation - by at least 500 m.y. Therefore, the mare basalts cannot be simple impact melts but rather must result from some igneous activity on the moon.
    Keywords: SPACE SCIENCES
    Type: Science; 175; Jan. 28
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  • 5
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    Studies of K-Ar dating and xenon from extinct radioactivities in breccia 14318; implications for early lunar history (1974)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The lunar breccia 14318 is one of three Apollo-14 breccias containing substantial amounts of parentless xenon from the spontaneous fission of extinct Pu-244. The argon and xenon contained in this breccia were studied by stepwise heating of pristine and neutron-irradiated samples. The isotopic composition of xenon from fission, determined by an improved method, is shown to be from Pu-244. Concentrations of this fissiogenic xenon are in substantial excess (15-fold) of what could be produced by spontaneous fission of U-238. The breccia is found to contain abundant trapped argon with an Ar-40/Ar-36 ratio of roughly 14. Otherwise, the argon is radiogenic and gives a convincing K-Ar age of 3.69 plus or minus 0.09 b.y. by the stepwise Ar-40/Ar-39 method, nearly in agreement with ages for other Apollo-14 breccias.
    Keywords: SPACE SCIENCES
    Type: Geochimica et Cosmochimica Acta; 38; Mar. 197
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  • 6
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    K/Ar dating of lunar soils. IV - Orange glass from 74220 and agglutinates from 14259 and 14163 (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Total fusion Ar-40 - A-39 analyses of orange glass from lunar soil 74220 combined with the sums of earlier stepwise heating data by other workers have yielded a precise K/Ar isochron with a slope corresponding to an age of 3.66 + or - 0.03 G.y. for the orange glass. The result is in marginal agreement with Huneke's (1978) age of 3.60 + or - 0.04 G.y. for 74220 glass. The Ar systematics in the agglutinates from 14259 and 14163 are dominated by volume correlated argon. Step-wise heating analyses yield data which define experimentally reproducible linear arrays in Ar-40/Ar-36 vs. K-40/Ar-36 diagrams. The slopes of these arrays correspond formally to very old ages, but it is not clear, however, that such ages have any physical significance.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 17, 1980 - Mar 21, 1980; Houston, TX
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  • 7
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    K/Ar dating of lunar soils. III - Comparison of Ar-39/Ar-40 and conventional techniques: 12032 and the age of Copernicus (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 14, 1977 - Mar 18, 1977; Houston, TX
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  • 8
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    Ar-40/Ar-39 studies of lunar breccias (1974)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Results of argon dating of lunar breccias from Apollo 14, 15, and 16 samples are presented. Basic chronological information was obtained on samples of 14270, 15362, 15455, and 63335,3; these samples averaged about 4 billion years in age. 14301 and 14313 were never isotopically homogenized and therefore do not yield ages. However, trapped argon in these breccias consists of two components, with one component rich in Ar-40 and fractionating at low temperatures during stepwise heating experiments.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 18, 1974 - Mar 22, 1974; Houston, TX
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  • 9
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    K/Ar dating of lunar soils. II (1976)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: An attempt is made to identify those K/Ar techniques which extract the most reliable chronological information from lunar soils and to define the situations in which the best data are obtainable. Results are presented for determinations of the exposure and K/Ar ages of five lunar soil samples, which were performed by applying correlation techniques for a two-component argon structure to stepwise-heated and neutron-irradiated aliquots of grain-sized separates. It is found that ages deduced from Ar-40/surface-correlated Ar-36 vs K-40/surface-correlated Ar-36 and analogous plots of data from grain-sized separates appear to be the best available K/Ar ages of submature to mature lunar soils, that ages deduced from Ar-40 vs Ar-36 and analogous plots which assume a uniform K content can be significantly in error, and that stepwise-heating (Ar-40)-(Ar-39) experiments yield useful information only for simple immature soils where the K-Ar systematics are dominated by a single component.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 15, 1976 - Mar 19, 1976; Houston, TX
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  • 10
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    Rare gases in cyclosilicates and cogenetic minerals (1984)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The cyclosilicate minerals, beryl, tourmaline, and cordierite, typically contain large amounts of He-4 and Ar-40 which are not in situ radiogenic products. In the study of excess rare gases in cyclosilicates, one of the most enigmatic observations is the age effect, a qualitative tendency for geologically older samples to contain more excess He-4 and Ar-40 than younger samples. The present investigation is concerned with measurements regarding the abundance and isotopic composition of all five rare gases in a number of cyclosilicates as well as in their cogenetic minerals. The significance of the obtained data is discussed. The data indicate that cyclosilicates sample the rare gases present in the environment in which they crystallize. This 'sampling' involves major elemental fractionations which are variable but mineral specific. Cyclosilicates can, therefore, be used to probe the isotopic ratios and elemental compositions.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 7891-790
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