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| multiple cosmic-ray exposure history of the Vaca Muerta mesosiderite Ken-ichi BAJO* and Keisuke NAGAO...material of a silicate–metal mixture from the Vaca Muerta mesosiderite as well as pyroxene and plagioclase...thermal event, probably at the formation of the Vaca Muerta parent body (VMPB). The presence of fissiogenic...materials approximately 4 Gyr ago. The Vaca Muerta meteorite was excavated from the VMPB 140 Myr ago...event approximately 3.8 Gyr ago. INTRODUCTION Vaca Muerta is classified as a mesosiderite, a breccia of |
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| variable from meteorite to meteorite and sometimes also exhibit variations in the same meteorite. Uranium...motivation of this work was to identify in a given meteorite as many U-rich phases as possible which could...plutonium and/or determine the thermal history of the meteorite. The decay of 2”Pu (an extinct radionuclide with...probably plutonium) were fractionated during the meteorite formation. In the present study, we concentrated...and Storzer (1975) first suggested measuring meteorite cooling rates by taking advantage of the different |
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| 31, 1985 37 Table 1 Uranium values in iron meteorite troilite and graphite. Accuracy based on simultaneously...technique might leave acidresistant minerals like zircon undissolved and Chen and Wasserburg(1983b)who wam...from the CR-39 I sneezed), but small quantities of zircon up to 1 mm in cross section have been reported...by Fleischer et al. (1965), but the sizes ofthe zircon fragments corresponding to the U concentration...can be made. The following, however, is clear: 1) Zircon is an occasional constituent of meteoritic troilite |
 | | Book |
| hands. At the Agua olgada quarry, Atacama Region, Chile, rutile is found in agmatite veinlets that contain...recently been reported from the Borborema pegmatitic province in Rio Grande do Norte, Brazil (Beurten et al...Agua Colgada quarry, Freirina, Atacama Region, Chile. Specimen is about 6 cm tall. RJL3431 Formation...L5; and the Vaca Muerta, Taltal, Atacama, Chile, mesosiderite. In the Vaca Muerta meteorite the rutile...large rutile grains. In contrast, the Allegan meteorite contains rutile disseminated as grains within |
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| minerals analyzed, only four (apatite. perovskite, zircon, ZrO.) show uranium contents > I ppm. Perovskite...technique (Wagner 1973) was used, with the large zircon KN279 (Table 3) as standar d material. Figures...ilmenite ilmenite calcite zircon (+zrO.) zircon zircon (+zrO.) zircon zircon zircon K D D C C K D D D D D...for one sample, 0.004-0.007 ppb U for another. Zircon contains between 8.0 and 20.4 ppm V (delayed neutron...sample, and 56 ± 2 ppm V for a zircon from Noeniput (NW Cape Province, South Africa). These elevated |
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| microscopist, Gustav Tschermak, and the outstanding meteorite collection of that day, the Vienna collection...meteorites. Table 1 traces the development of meteorite mineralogy over the following seventy years. It...extracted sulfur with alcohol from the Cold Bokkeveld meteorite, and later investigators extracted it from other...weathering. In 1955, therefore, to specializein meteorite mineralogy might well have beenconsideredthe refugeol...then, as is illustrated in Table 2.The number of meteorite minerals has more than doubled in the last ten |
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| elsevier.com/locate/gca Mechanisms of radon loss from zircon: Microstructural controls on emanation and diffusion...upon heating for crushed aliquots of three large zircon crystals from three localities: Mud Tank (Australia)...(REC) varies over 5 orders of magnitude in zircon. For low U zircon, Mud Tank, there are variations in REC...fission tracks, however, all REC values for Mud Tank zircon are within error of one another. Bancroft and Malawi...to annealing temperature. Results from Mud Tank zircon suggest that partial annealing of fission tracks |
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| Structural and compositional properties of iron meteorite groups ___________ The geochemical behavior of...ABBREVIATIONS The following abbreviations for the meteorite classes are used throughout the tables and elsewhere;...percent) ; all others (<0.01 percent). A list of meteorite minerals is provided, and a tabulation of elemental...minerals are quartz and aluminosilicates; the common meteorite minerals are anhydrous, whereas hydrated minerals...actual extraterrestrial abundances; irons dominate meteorite finds since they are resistant to weathering and |
 | | Book (edition) |
| 1565 °C. 1450° C. Chromite Hematite Ilmenite Zircon and Zirconosilicates. The principal which contain...zirconium, in eruptive rocks, are : — minerals Zircon, ZrSi04 Eucolite (eudialvte), perhaps (Na,Ca...rosenhuschite, lavenite, and others of doubtful Zircon alone is of common occurrence, but eudialyte and...certain classes of rocks. The melting point of zircon is 2550°. Many minerals have Titanosilicates and...Monazite, a syenites, where it is often mistaken for zircon. phosphate of the cerium group of metals, occurs |
 | | Book |
| provide an introduction to meteorite science and a handbook on meteorite classification. Insofar as I...These chapters would have been useful chiefly to meteorite researchers looking for a quick summary of group...quantitative meteorite studies declined during 1970-1973 as a result of the diversion of meteorite researchers'...efforts to the study of lunar samples. The rate of meteorite research activity is now increasing as researchers...during the past decade regarding problems of meteorite origin and classification. A complete list would |
 | | Book |
| provide an introduction to meteorite science and a handbook on meteorite classification. Insofar as I...These chapters would have been useful chiefly to meteorite researchers looking for a quick summary of group...quantitative meteorite studies declined during 1970-1973 as a result of the diversion of meteorite researchers'...efforts to the study of lunar samples. The rate of meteorite research activity is now increasing as researchers...during the past decade regarding problems of meteorite origin and classification. A complete list would |
