Zobrazeno 1 - 10
of 234
pro vyhledávání: '"Ernst Zinner"'
Autor:
Rainer Wieler, Matthias M. M. Meier, Henner Busemann, Colin Maden, Heinrich Baur, Philipp R. Heck, Ernst Zinner, Frank Gyngard, Sachiko Amari, Manavi Jadhav, Teruyuki Maruoka
Publikováno v:
Meteoritics & Planetary Science. 53:2327-2342
We present He and Ne isotopes of individual presolar graphite grains from a low-density separate from Orgueil. Two grain mounts were analyzed with the same techniques but in a different sequence: The first one was measured with NanoSIMS followed by n
Publikováno v:
Geochimica et Cosmochimica Acta. 221:145-161
We report correlated Si, and Ti isotopic compositions and elemental concentrations of 238 presolar SiC grains from the Murchison CM2 meteorite. Combined with measurements of the C and N isotopic compositions of these 238 grains, 220 were determined t
Autor:
Ernst Zinner, M. E. Varela
Publikováno v:
Geochimica et Cosmochimica Acta. 221:358-378
The process/es involved in chondrule formation cover a wide range of mechanisms whose nature is still unknown. Our attention is focused on solar nebula processes mainly in untangling the origin of the initial liquid droplets that turn into chondrules
Publikováno v:
Geochimica et Cosmochimica Acta. 221:60-86
We report the morphology, microstructure, and isotopic composition of the largest SiC stardust grain known to have condensed from a supernova. The 25-μm diameter grain, termed Bonanza, was found in an acid-resistant residue of the Murchison meteorit
Autor:
Maria Eugenia Varela, Ernst Zinner
Publikováno v:
Meteoritics & Planetary Science. 50:2045-2066
Glass-bearing inclusions hosted by different mineral phases in SNC meteorites provide important information on the conditions that prevailed during formation of early phases and/or on the composition of the primary trapped liquids/melts of these rock
Publikováno v:
Geochimica et Cosmochimica Acta. 133:479-522
We studied presolar graphite grains from four density fractions, KE3 (1.65–1.72 g/cm3), KFA1 (2.05–2.10 g/cm3), KFB1 (2.10–2.15 g/cm3), and KFC1 (2.15–2.20 g/cm3), extracted from the Murchison (CM2) meteorite, with the ion microprobe. One of
Autor:
Guilherme Mallmann, Frank Gyngard, Peter Holden, Trevor Ireland, Sachiko Amari, Janaína N. Ávila, Maria Lugaro, Ernst Zinner
Publikováno v:
Geochimica et Cosmochimica Acta. 120:628-647
We report barium isotopic measurements in 12 large (7-58 mu m) stardust silicon carbide grains recovered from the Murchison carbonaceous chondrite. The C-, N-, and Si-isotopic compositions indicate that all 12 grains belong to the mainstream populati
Autor:
Kuljeet K. Marhas, Sachiko Amari, Teruyuki Maruoka, Ernst Zinner, Manavi Jadhav, Roberto Gallino
Publikováno v:
Geochimica et Cosmochimica Acta. 113:193-224
We report C, N, O, Si, Al–Mg, K, Ca, and Ti isotopic analyses of presolar graphite grains from the Orgueil CI chondrite. NanoSIMS isotopic measurements were made on 345 grains from seven density fractions, with grain sizes >1 lm: low-density grains
Publikováno v:
Geochimica et Cosmochimica Acta. 106:463-489
Raman analyses are reported of μm-sized areas of 103 individual carbonaceous presolar grains (“graphite grains”) from three different density fractions of the Murchison meteorite. Few of the grains (2 or 3 of each density fraction) have Raman sp
Publikováno v:
Meteoritics & Planetary Science. 47:832-852
– Although considerable progress has been made in unraveling the origin(s) of fayalitic olivines in dark inclusions (DIs), many questions remain still unresolved and/or controversial. We combine a chemical and petrographic study of the Allende dark