calcium aluminum inclusions

Oxygen isotopes in calcium^aluminum-rich inclusions from …

Calcium^aluminum-rich inclusions (CAIs) from primitive chondritic meteorites were among the ¢rst-formed solids in the solar nebula V4.6 Ga, and therefore bear important physical and chem-ical information about the earliest stages of solar system evolution. CAIs

Calcium-Aluminum-Rich Inclusions from Enstatite …

Abstract The primary mineral asselages and initial ^(26)Al/^(27)Al ratios of rare calcium-aluminum–rich inclusions (CAIs) from enstatite (E) chondrites are similar to those of CAIs from other chondrite classes. CAIs from all chondrite classes formed under oxidizing

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FORMATION TIMESCALES OF WARK-LOVERING RIMS AROUND CALCIUM-ALUMINUM RICH INCLUSIONS.

Introduction: Calcium-Aluminum-rich Inclusions (CAIs) are thought to be the first solids to form in the early Solar System [1-4]. These inclusions are sur-rounded by mono- and bi-mineralic rim sequences, called the “Wark-Lovering” (WL) rims [5], which are

Calcium-aluminum-rich inclusions in enstatite …

Like calcium-aluminum-rich inclusions (CAIs) from carbonaceous and ordinary chondrites, enstatite chondrite CAIs are composed of refractory minerals such as spinel, perovskite, Al, Ti-diopside, melilite, hibonite, and anorthitic plagioclase, which may be partially to

Clean Steel: Part Three :: Total Materia Article

The addition of calcium to steel which contains such inclusions changes the composition of these inclusions from pure alumina to CaO-containing calcium aluminates. As it can be see from Figure 1, the, melting point of the calcium aluminates will decrease as the CaO content increases, until liquid oxide phases occur at about 22% of CaO, i.e., when the CaO.2Al 2 O 3 compound is first exceeded at

Transient Inclusion Evolution During Modifiion of …

Inclusion compositions Table II gives the bulk analyses of the heats after calcium treatment (as discussed in Part I, Al2O3 inclusions were present after aluminum deoxidation).

Transient Inclusion Evolution During Modifiion of …

In this work, the inclusions were compounds of calcium and aluminum with oxygen and sulfur. Because the valence of calcium and aluminum in the inclusions is ?xed, inclusion compositions can be represented on ternary Al-Ca-S plots without losing any

Metamorphosed calcium-aluminum-rich inclusions in …

Although CKs are described as calcium-aluminum-rich inclusion (CAI)-poor objects, the abundance of CAIs in the 18 CK3-6 we analyzed ranges from zero to approximately 16.4%. During thermal metamorphism, some of the fine-grained CAIs recrystallized as irregular asselages of plagioclase + Ca-rich pyroxene ± olivine ± Ca-poor pyroxene ± magnetite.

An isotopic and petrologic study of calcium-aluminum …

Russell, S. S.; Huss, G. R.; Fahey, A. J.; Greenwood, R. C.; Hutchison, Robert and Wasserburg, G. J. (1998). An isotopic and petrologic study of calcium-aluminum-rich

Calcium-aluminum-rich inclusions with fractionation …

Calcium-aluminum-rich inclusions with fractionation and unknown nuclear effects (FUN CAIs): I. Mineralogy, petrology, and oxygen isotopic compositions 374 Krot, A.N.

Calcium-aluminum-rich inclusions from enstatite …

25/8/2000· 1. Science. 2000 Aug 25;289(5483):1330-3. Calcium-aluminum-rich inclusions from enstatite chondrites: indigenous or foreign? Guan Y(1), Huss GR, MacPherson GJ, Wasserburg GJ. Author information: (1)Department of Mineral Sciences, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560-0119, USA. . Lunatic Asylum, Division of Geological and Planetary …

Meteorite photos, Meteorites, Enstatite''s, CAI''s, Calcium …

Devon Island Many of the surface features on Mars are attributed to periglacial (ice, snow) and possibly, fluvial (valley-forming) processes. One terrestrial environment that may be an analog is the Houghton crater at Devon Island loed high in the Canadian Arctic.

THE INCLUSION STUDY AND THE DETERMINATION OF ALUMINUM AND INSOLUBLE CALCIUM …

Figures 4 and 5 shows metallographic images of the disposition of calcium aluminate inclusions in samples studied, as well as inclusions: globular (Fig.4) and irregular (Fig.5). Distribution of nuer of inclusions of aluminum, calcium and calcium 0 5 10 15 20

Chronology of the early Solar System from chondrule …

A. N., Hutcheon, I. D. & Ulyanov, A. A. Lead isotopic ages of chondrules and calcium-aluminum-rich inclusions. Science 297, 1678–1683 (2002) ADS CAS Article Google Scholar

Morphology Control for Al2O3 Inclusion Without Ca …

Therefore, based on the above thermodynamic analysis, slag washing during the converter tapping, accompanied with two-step Al-adding process and appropriate top-slag refining process, is proposed as a methodology of Al 2 O 3-inclusion control for high-aluminum steel as an alternative to the conventional calcium-wire-feeding process.

CAI - calcium-aluminum-rich inclusion | AcronymAttic

"Lead isotopic ages of chondrules and calcium-aluminum-rich inclusions. Science 297 (5587): 1678–83. doi:10. 1126/science. 1073950. This reveals a dark matrix eedded throughout with mm-sized, lighter-colored chondrules, tiny stony spherules found only in meteorites and not in earth rock (thus it is a chondritic meteorite).

[PDF] The Absolute Chronology and Thermal Processing …

22/8/2020· Dating the First Solids The solar system''s first solids: calcium-aluminum–rich inclusions and chondrules are found in meteorites and provide a direct record of the dynamics of the solar protoplanetary disk that led to the formation of the solar system. Previous results indie that chondrules formed 1 to 2 million years after the inclusions—an age difference that has been used in

Calcium-aluminum-rich inclusions with fractionation …

Calcium-aluminum-rich inclusions with fractionation and unknown nuclear effects (FUN CAIs): I. Mineralogy, petrology, and oxygen isotopic compositions By Alexander N. Krot, Kazuhide Nagashima, Gerald J. Wasserburg, Gary R. Huss, Dimitri A. Papanastassiou, …

Flash heating of calcium‐aluminum‐rich inclusions, …

From the Editors Flash heating of calcium-aluminum-rich inclusions Our solar system was born at -4.56 Ga ago through accretion of hydrogen gas and dust grains of a molecular cloud, and the inner region of the solar nebula experienced high temperatures in the early stage of its evolution. The achievement of high temperatures caused evaporation of pre-existing condensed materials and subsequent

Calcium-Aluminum—Rich Inclusions from Enstatite Chondrites: …

Calcium-Aluminum—Rich Inclusions from Enstatite Chondrites: Indigenous or Foreign? Yunbin Guan,1 Gary R. Huss,2,3 Glenn J. MacPherson,1 Gerald J. Wasserburg2 The primary mineral asselages and initial 26Al/27Al ratios of rare calcium-aluminum—rich

Study of the Nature of Non-Metallic Inclusions in Samples of Aluminum …

Vol. 7, No. 4, 2004 Study of the Nature of Non-Metallic Inclusions in Samples of Aluminum and Silicon Killed 519 Low Carbon Steels, Collected in the Refining Treatment and Continuous Casting Stages the inclusions present in the final samples of the treatment of

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New Theory on Formation of Solar System''s First Sf | …

A new study proposes two early solar system solids — chondrules and calcium-aluminum rich inclusions — formed at the same time. A new view of the solar system''s early days proposes that the

Tungsten and hafnium distribution in calcium–aluminum …

Tungsten and hafnium distribution in calcium–aluminum inclusions (CAIs) from Allende and Efremovka Munir Humayun a,b,*, Steven B. Simon c, Lawrence Grossman c,d a National High Magnetic Field Laboratory, Florida State University, 1800 E. Paul Dirac Drive, Tallahassee, FL 32310, USA

Chemical Processes in Igneous Calcium-Aluminum-rich Inclusions…

Calcium-,aluminum-rich inclusions (CAIs) and Al-rich chondrules reflect multiple processes in many different en-vironments. In this chapter, we consider constraints on high-temperature processes from the perspective of phase equilib-ria and dynamic

THE NON METALLIC INCLUSION STUDY IN CAR STEEL SAMPLES AND DETERMINATION OF ALUMINUM AND CALCIUM …

inclusions, and one Al and Ca inclusions (Fig. 4). Out of the Spark diagram it can be concluded that the Ca inclusions are uniform distributed in the volume of the sample and the most intense was the spark nuer 420, while for aluminum the most intense one