 | | Journal (article/letter/editorial) | | MINERALOGIST, VOL. 51, JANUARY-FEBRUARY, 1966 KAMACITE AND TAENITE SUPERSTRUCTURES AND A METASTABLE TETRAGONAL...oJ W,iscon sin, M adison, W'iscon sin. Assrnacr Kamacite and taenite in iron meteorites have cubic superstructures...seemingly has the same chemical composition as kamacite. This is consideredto be a transitional state...transformation of -y-phasealloy into a-phase alloy (kamacite). INrnooucrroN X-ray powder photographs have...drilled samplesyielded the simple cubic patterns of kamacite (a Fe-Ni ailoy) and/or taenite (7 Fe-Ni alloy) |  | | Journal (article/letter/editorial) | | Engineering, Lehigh University, Bethlehem. PA 18015. USA (Received June 16, 1992; accepted in revisedjbrm...Widmanstatten pattern of two iron meteorites (Grant and Carlton) was studied using high spatial resolution analytical...subsequent decomposition during cooling of the meteorite occurs over a wide temperature range and a broad...micro-structure of tetrataenite (FeNi) precipitates in a kamacite (cy) matrix. These precipitates have a relatively...and are in equilibrium with the matrix phase, kamacite, of -4 wt% Ni. The growth of tetrataenite in low |  | | Journal (article/letter/editorial) | | study of the plessite structure in the Carlton iron meteorite L. S. LM, J. I. GOLDSTEINand D. B. WILLIAMS...the range of plessite structures observed in the Carlton fine octahedrite. Compositional and structural...presence of y-taenite rods, 10-200 nm wide, in an a-kamacite matrix. Scanning transmission electron microscope...martensite during the cooling history of the meteorite. It is quite probable that the martensite decomposition...optically as a micro-Widmanstltten pattern of kamacite plates and residual taenite. At high enough temperatures |  | | Journal (article/letter/editorial) | | 160 Governors Drive, Amherst, Massachusetts 01003, USA 2Materials Characterization Department, Sandia National...Box 5800, MS 0886, Albuquerque, New Mexico 87185, USA *Corresponding author. E-mail: jig0@ecs.umass.edu...Abstract–Plessite is a mixture of body-centered cubic (bcc) kamacite (α), face-centered cubic (fcc) taenite (γ), and/or...diffraction (EBSD) analysis in five ataxites, the Carlton IAB-IIICD iron, and zoneless plessite metal in...a number of different orientations of the bcc kamacite phase in the plessite microstructure. These orientations |  | | Journal (article/letter/editorial) | | phase diagram with pressnre; (3) t,he average meteorite composition; (4) the radius of the parent body...ataxiles, and the decrease in Ni concentration in the kamacite near the a/y boundary arc all explained in terms...be d~~~~~~ated .A full explanation of how the meteorite structures formed could in the laboratory. contribute...composition are the important factors determi~n~ the meteorite structure. Temperature affects the nucleation...pressure, and thernlal history of the parent meteorite body. The main purpose of this study has been |  | | Journal (article/letter/editorial) | | conventional fee twin relationship, individual kamacite and taenite cells in the cloudy zone have the...Widmanstiitten plates of kamacite (a Fe-Ni) in a matrix of taenite (y Fe-Ni). Kamacite nucleates and grows...and OGILVIE, 1965; KAUFMAN and COHEN, 1956). The kamacite and taenite both increase in Ni content as cooling...enriched in Ni. As kamacite growth continues below 500°C the taenite borders with kamacite continue to be...be enriched in Ni. When meteorite specimens are polished and etched these taenite regions show progressive |  | | Journal (article/letter/editorial) | | (1993) OMeteoritical Society, 1993. Printed in the USA. Genesis of the IIICD iron meteorites: Evidence...University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA 1Also associated with the Hawaii Center for Volcanology...inclusions in the HICD iron meteorites Maltahohe, Carlton and Dayton suggest that their mineralogy and mineral...meteorites have led to the recognition of 13 iron meteorite groups (e.g., Malvin et al., 1984). Eleven of...they have been referred to as the magmatic iron meteorite groups (e.g., Wasson et al., 1980). In contrast |  | | Journal (article/letter/editorial) | | obtained Cu data on 104 irons, 2 I pa&sites, and 3 meteorite phases previously studied by E. Scott. We show...defined the properties of 13 independent iron meteorite groups. Each of these groups appears to have originated...were tared. Two replicates were run for each meteorite except in cases of limited sample mBss or of established...established pairing with a previously analyzed meteorite. Only turnings of Hu~ing and hiiyweathered samples...independent iron meteorites and a mesoslderlte. Meteorite Alikatnima Alla" Hills Allan Hills Allan Hills |  | | Journal (article/letter/editorial) | | J. M. Herndon and M. W. Rowe Texas A&M University College Station, Texas 77843 E. E. Larson University...the magnetic susceptibility in more than 900 meteorite samples from collections throughout the Soviet...for us by Judith A. Holm, Department of English, Texas A&M University. Translated copies of these papers...(1967a,b, 1969a,b, 1971, 1972). The transliterated meteorite names occurring in the English translations frequently... 1969). (5) The lower the Ni-Fe content of a meteorite, the more closely grouped are the NRM and X intensities |  | | Journal (article/letter/editorial) | | extraordinarily large compared to those found in observed meteorite showers. There appears to be no connection between...North Chilean hexahe~~s, xspractice to which many meteorite researchers have conformed. In it more recent...Upon inquiry, we found that Harvard has no iron meteorite speoimen under this name, whereas Chimgo has only...illusions ; (2) Hexahedrites composed of several kamacite crystals, and containing relatively large schreibersite...the highest Ir concentration kndwn in an iron meteorite, 65 ppm; Sierra Gorda hw 48 ppm, and ~eiiilones |  | | Journal (article/letter/editorial) | | TREMORGIO (CANTON TICINO) AS A POSSIBLE QUARTERNARY METEORITE IMPACT CRATER IN THE SWISS ALPS Kurt Bachtiger...the author had, some years ago, the idea of a meteorite impact crater in the Quarternary, i.e. 20-50,000...some interpretations will be attempted. 171 K Meteorite Type (ppm) johnstown (whole rock) Di 853...Total Ar 39_Ar40 age (G.Y.) 4.38 4.07 maximum Meteorite minimum Bjurbole 4.12 3.46 3.96 3.98 1.62 ... An agglutinate is born when a primary micro-meteorite impact (velocity - 20 km/sec) melts a little surface |  | | Journal (article/letter/editorial) | | supported by NSF grant EAR 76-01146. THE SHAW METEORITE: EVIDENCE FOR AN IGNEOUS ORIGIN J.L. Berkley...Johnson Space Center, Houston, TX 77058 The Shaw meteorite has Lgroup chondritic bulk chemistry and mineralogy...is the dominant metallic phase; it is rimmed by kamacite that averages r - 20 microns in width. Conclusions:...crystallized first as taenite, which later precipitated kamacite on its borders at """ 660° C; the remaining taenite...to martensite at """ 380° C. A calculation of kamacite growth rates indicates a cooling rate of 700° |  | | Book | | METEORITE RESEARCH ASTROPHYSICS AND SPACE SCIENCE LIBRARY A SERIES OF BOOKS ON THE RECENT DEVELOPMENTS... Harvard College Observatory, Cambridge, Mass., USA C. DE JAGER, G. H. LUDWIG, University of Utrecht...NASA, Goddard Space Flight Center, Greenbelt, Md., USA R. LUST, Institut fiir Extraterrestrische Physik...L. I. SEDOV, NEWELL, NASA, Washington, D.C., USA Academy of Sciences of the USSR, Moscow, USSR Secretary...Holland VOLUME 12 METEORITE RESEARCH PROCEEDINGS OF A SYMPOSIUM ON METEORITE RESEARCH HELD IN VIENNA |  | | Book (edition) | | Little Planets in Motion of a Comet 67 88 Meteorite Falls lO Meteorites in the Laboratory 175 ...College Observatory. plate The Plainvicw meteorite from Texas. These two stones, fit together perfectly...inger.) plate 24. Flow marks on the Lafayette meteorite. The liquid glassy crust formed during the air...on the back, shown at the right. Part of the meteorite has been cut pi \ ii off. (U. 25. S. National...of Museum.) the Hugoton, Kansas, meteorite. This Stony meteorite, weighing 346 kg., was discovered by |  | | Book | | Publishing Scripta Company, Washington, DC 20005 USA. Acta Chemica Scandinavica, 1947-, Munksgaard, Noerre...Ohio 43214, USA. American Chemical Society, Journal, 1879-, Washington, DC 20036, USA. American Crystallographic...Penn- USA. American Journal of Science, 1818- Yale University, New Haven, Connecticut 06520, USA. PREFACE... PREFACE 1909 K Street NW, Washington, DC 20006, USA. Arkiv for Mineralogi och Geologi, 1949-, Almqvist...The Ohio State University, Columbus, Ohio 43210, USA. Chemical Geology, 1966-, An International -Journal |  | | Book (edition) | | abbreviations: Rep. (republic), prov. (province), co. (county), munic. (municipio), pref. (prefecture), dept...always included in text, except in the cases of the USA, UK, and the provinces Ontario and Quebec in Canada...Uintah County. Utah. and m (2.B. acanthite group). Monoclinic, C2/m, a,b,c Rio Blanco County. Colorado...Plat., Malawi, G 10 17 River Formation in Uintah County, Utah. Deer et al., v. 2A,483, 1997. Aenigmatite...phonolites, rhyolites, and their lavas in Sonoma County, California, in the Picture Gorge basalt, Wheeler |  | | Audio (Series) | | 1Cuapp, C. H., Geology of the igneous rocks of Essex County, Mass., U. 8. Geol. Survey Bull. 704, 1921. 2 Buss...an area of alkalic feldspars. Linden, St. Louis County, Minnesota. titanite X15. Fic. 54.—Inclusion...from Essex variously defined by different authors. County, Mass., but the rocks at the type locality are...62.—Hand specimen of a glomeroporphyry, Cook County, Minnesota. About one- half natural size. Fie...—Hand specimen of diabase gabbro, Cook size. County, Minnesota. About natural THE PETROGRAPHY |
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