40 Ar/ 39 Ar ages of lunar impact glasses: Relationships among Ar diffusivity, chemical composition, shape, and size
نویسندگان
چکیده
منابع مشابه
THE EXTENDED LAW OF CORRESPONDING - STATES AND THE INTERMOLECULAR POTENTIALS FOR Ar-Ar, Ar-Kr AND Kr-Kr
An inversion procedure is used to obtain from the extended principle of corresponding - states the pair interaction potentials for argon, krypton and its mixture over a tetnperature range from absolute zero to the onset of ionization. The experimentally-reduced viscosity collision integrals obtained from the corresponding - states correlation have been inverted directly to give the reduced...
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Eighty-nine basaltic lava flows from the northwest wall of Haleakala caldera preserve a concatenated paleomagnetic record of portions of the Matuyama–Brunhes (M–B) reversal and the preceding Kamikatsura event as well as secular variation of the full-polarity reversed and normal geomagnetic field. They provide the most detailed volcanic record to date of the M–B transition. The 24 flows in the t...
متن کاملAr-ar Impact Ages of Shocked Ll Chondrites
Introduction: Due to the relatively low closure temperature of feldspar, Ar-Ar ages of shocked meteorites typically record the age of an impact, not the formation age. Ar-Ar dating of lunar rocks has shown an increase in the impact rate around 3.9Ga [1], and many eucrites [2] and H chondrites [3] give similar ages, but with a larger spread than in the lunar case. Although only a small number of...
متن کاملthe extended law of corresponding - states and the intermolecular potentials for ar-ar, ar-kr and kr-kr
an inversion procedure is used to obtain from the extended principle of corresponding - states the pair interaction potentials for argon, krypton and its mixture over a tetnperature range from absolute zero to the onset of ionization. the experimentally-reduced viscosity collision integrals obtained from the corresponding - states correlation have been inverted directly to give the reduced-inte...
متن کاملAr ages and 40 Ar ) concentrations of fine - grained sediment fractions from North Atlantic Heinrich layers
New KrAr ages based on ArrAr incremental heating of -2and 2–20-mm size fractions of the well-characterized, carbonate-bearing Heinrich layers of core V28-82 in the eastern North Atlantic are 846–1049 Ma, overlapping with conventional KrAr ages from the same Heinrich layers on the Dreizack seamounts of 844–1074 Ma. This agreement suggests the equivalence of the methods in fine-grained terrigenou...
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ژورنال
عنوان ژورنال: Geochimica et Cosmochimica Acta
سال: 2015
ISSN: 0016-7037
DOI: 10.1016/j.gca.2015.04.013