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  • Astrophysics  (1)
  • Space Sciences (General)  (1)
  • supercritical properties  (1)
  • 1
    Electronic Resource
    Electronic Resource
    CaCl2-H2O in the supercritical and two-phase ranges (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 483-492 
    Details
    ISSN: 1572-9567
    Keywords: aqueous solution ; calcium chloride ; critical line ; supercritical properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Critical temperatures (T c ) and densities (πc) for aqueous CaCl2 solutions were measured using two different optical techniques, Measurements ofT c were made using sealed silica capillaries containing 0,3, 0,5, 1,0, and 2,0 molal CaCl2(aq)) solutions. TheT c values from these measurements are 661, 666, 678, and 738 K, respectively. Critical temperatures were also determined from measured homogenization temperatures and the observed mode of homogenization (i.e.. to the liquid or vapor phase or by fading of the meniscus) in synthetic fluid inclusions. Critical temperatures determined by the second method for 1.0, 2.0, and 3.0 molal CaCl2(aq) solutions are 680, 739, and 838 K. respectively. TheT c for 4.0 molal CaCl2(aq) was found to be in excess of 933 K, The capillary-tube measurements yield approximate values of the critical density ϱc, but do not give the critical pressureP c Approximate values ofT c ,. are available, however, from other sources.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01441914
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    Paper (German National Licenses)
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  • 2
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    Organic Compounds in Early Solar System Aqueous Fluids (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-27
    Description: thermally-metamorphosed ordinary chondrite regolith breccias (Monahans 1998, hereafter simply Monahans ( 5) and Zag (H3-6)) contain fluid inclusion-bearing halite (NaCl) crystals dated to be ~4.5 billion years old. Thus, compositional data on fluid inclusions in these halites will reveal unique information regarding the origin and activity of aqueous fluids in the early solar system, and especially their interactions with organic mate- rial. Our initial analyses of solid inclusions in Monahans halite has shown the presence of olivine, high- and low- Ca pyroxene, feldspars, magnetite, sulfides, phyllosilicates, zeolites, metal, phosphates and abundant organics. We age of carbon, carbonates and organics in these residues, and low but significant amino acids concentrations in Monahans and Zag halite.
    Keywords: Space Sciences (General)
    Type: JSC-E-DAA-TN68431 , Annual Meeting of the Meteoritical Society; Jul 08, 2019 - Jul 12, 2019; Sapporo; Japan
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Fluid Inclusions in Extraterrestrial Samples Fact or Fiction? (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: Over the years there have been numerous reports of liquid inclusions in meteorites. Roedder reviews the reported occurrences of liquid inclusions in meteorites and states that "silicate-melt inclusions are expectable and apparently ubiquitous, but the presence of actual liquid inclusions (i.e., with moving bubbles at room temperature) would seem almost impossible." The reason for this conclusion is that meteorites (presumably) form in space at high temperatures and very low pressures where liquid water (or carbon dioxide) is not stable. Perhaps the most infamous report of fluid inclusions in meteorites was that of Warner et al. In that study, the authors reported the presence of two-phase, liquid-vapor inclusions in a diogenite from Antarctica. This report of fluid inclusions generated considerable interest in the meteorite community, and caused many to question existing models for the origin of the diogenites. This interest was short-lived however, as later investigations of the same samples showed that the inclusions were most likely artifacts. Rudnick et al. showed that many of the inclusions in meteorites prepared at the Johnson Space Center contained a fluid that fluoresced strongly under the laser beam on the Raman microprobe. They interpreted this to indicate that the inclusions contained Almag oil used in the preparation of thin sections. Presumably, the Almag oil entered empty vesicles along fractures that were opened intermittently during cutting. Here, the occurrence of unambiguous fluid inclusions that could not have been introduced during sample preparation are described in samples from two different extraterrestrial environments. One environment is represented by the SNC (martian) meteorites ALH 84001 and Nakhla. The second environment is represented by the Monahans 1998 meteorite that fell recently in the USA.
    Keywords: Astrophysics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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