ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    facet.materialart.
    Unknown
    Evidence for an approximately 4.5 aeon age of plagioclase clasts in a lunar highland breccia (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Argon from neutron-irradiated mineral separates and whole rock samples of a metamorphosed breccia (65015) from Apollo 16 has been analyzed with a large number of gas extraction steps in order to obtain a high resolution in the apparent ages and to identify the gas released from different sources. The results on plagioclase show a Ar-40/Ar-39 plateau age of 3.98 b.y. which is attributed to the time of metamorphism, and an age of about 4.5 b.y. in the high-temperature fraction. Correlation of the release pattern with Ar-37 instead of Ar-39 permits the association of the approximate 4.5 b.y. age with relict plagioclasts which were demonstrated in previous petrographic and Rb-Sr studies as being unequilibrated. This result suggests that it is possible to identify lithic components which represent the early lunar crust.
    Keywords: SPACE SCIENCES
    Type: Nature; 248; Mar. 15
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Determination of an internal super 87 Rb-super 87 Sr isochron for the Olivenza chondrite. (1969)
    In:  Other Sources
    Details
    Publication Date: 2011-08-12
    Description: Rb-Sr isotopic determinations for Olivenza olivine-hypersthene chondrite, noting isotopic ratio vs age
    Keywords: SPACE SCIENCES
    Type: ; ST. OF RADIO AND ELE
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 3
    facet.materialart.
    Unknown
    The relative isotopic abundance of K super 40 in terrestrial and meteoritic samples. (1966)
    In:  Other Sources
    Details
    Publication Date: 2019-05-30
    Description: Relative isotopic abundance of potassium 40 in terrestrial and meteoritic samples
    Keywords: SPACE SCIENCES
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 4
    facet.materialart.
    Unknown
    Rb-Sr systematics of Luna 20 and Apollo 16 samples. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: For the soils of two lunar highland sites from which samples were returned by the Luna 20 probe and the Apollo 16 mission, Rb-Sr data are presented. For comparison, the results of some additional analyses of Apollo 15 soils are also given. All these soils indicate that an early lunar differentiation process occurred in the interval of 4.3-4.6 b.y. and resulted in the formation of a crust rich in K, Rb, U, and Th.
    Keywords: SPACE SCIENCES
    Type: Earth and Planetary Science Letters; 17; Dec. 197
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 5
    facet.materialart.
    Unknown
    A response to a comment on U-Pb systematics in lunar basalts. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: SPACE SCIENCES
    Type: Earth and Planetary Science Letters; 19; 2, Ju; June 197
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 6
    facet.materialart.
    Unknown
    The age and petrography of two Luna 20 fragments and inferences for widespread lunar metamorphism. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Ages were determined by the Ar-40/Ar-39 method on two metaclastic rocks returned from the lunar highlands north of Mare Fecunditatis by the Luna 20 probe. Both samples gave very well-defined argon retention ages of 3.90 plus or minus 0.04 AE which are indistinguishable from each other within a resolution of 0.02 AE. Both fragments, 22006 and 22007, are highly recrystallized polymict breccias; there is no evidence of radiogenic Ar-40, and the age almost surely dates the time of recrystallization. The cosmic ray exposure ages of these fragments are similar and high: 900 million years for 22006, 1300 million years for 22007. 22007 also contains substantial trapped argon with a high Ar-40/Ar-36. The Luna 20 results greatly extend the area of the moon's surface exhibiting a well-defined record of metamorphism at 3.9 AE. So far, lunar history in the interval from 4.6 to 3.9 AE is not preserved in the ages of surface rocks. This obliteration suggests lunar-wide metamorphic conditions occurring or terminating at this time as a result of major impacts.
    Keywords: SPACE SCIENCES
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 7
    facet.materialart.
    Unknown
    U-Th-Pb analyses of soil from the Sea of Fertility. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Analyses have been made of lead, uranium, and thorium in two soil samples from the Luna 16 mission. Lead was found to be distinctly radiogenic, but significantly less radiogenic than other lunar soils. The Th/U ratio was found to be 3.8, and the uranium concentration was the lowest so far found for lunar soils.
    Keywords: SPACE SCIENCES
    Type: Earth and Planetary Science Letters; 13; Jan. 197
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 8
    facet.materialart.
    Unknown
    Gas retention and cosmic-ray exposure ages of a basalt fragment from Mare Fecunditatis. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The Ar40-Ar39 gas retention age and the Ar38-Ar37 cosmic ray exposure age have been determined on a total rock sample of the basalt fragment B-1 returned from Mare Fecunditatis by the Luna 16 mission. This sample shows a large low-temperature loss of radiogenic Ar40 but defines a reasonably good high-temperature plateau at 3.45 plus or minus 0.04 b.y. This is presumed to identify the period of igneous activity in Mare Fecunditatis. This activity is found to be later than that in the area of Mare Tranquilitatis, but earlier than that in the area of Oceanus Procellarum and Mare Imbrium. The cosmic-ray exposure age was found to be 475 m.y.
    Keywords: SPACE SCIENCES
    Type: Earth and Planetary Science Letters; 13; Jan. 197
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 9
    facet.materialart.
    Unknown
    Uranium-bearing minerals of lunar rock 12013. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The U distribution in rock 12013 was studied by fission track and elemental mapping techniques. Major U-bearing phases are whitlockite, apatite, zircon, and phase beta, which is a Zr-Ti mineral rich in Fe, Nb, Y, REE, and containing up to 3.6% UO2, 4.7% ThO2 and 4.2% PbO. Calculated microprobe ages for phase beta average 4.0 b.y. and are in reasonable agreement with Rb-Sr and K-Ar ages. Phase beta plays a significant role in the U-Th-Pb systematics of rock 12012 and may play a similar role in the model ages of lunar soil.
    Keywords: SPACE SCIENCES
    Type: Earth and Planetary Science Letters; 12; Oct. 197
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 10
    facet.materialart.
    Unknown
    Lunar neutron stratigraphy. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Study of the isotopic composition of gadolinium and samarium in four soil and seven drill stem samples returned by the Apollo 15 mission. The results show the possibility to date sedimentary processes on the lunar surface for time scales of around 100 million years because of the particular dependence of neutron capture reactions on depth. The neutron flux has a distinct peak as a function of depth. This peak appears to lie below the level of shallow cratering for time scales of less than one billion years and consequently forms a readily identified marker layer of both depth and time.
    Keywords: SPACE SCIENCES
    Type: Earth and Planetary Science Letters; 15; June 197
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...