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  • 115-711A; DRILL; Drilling/drill rig; Joides Resolution; Leg115; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean  (1)
  • Coordinating Committee
  • Inorganic, Organic and Physical Chemistry
  • 2000-2004  (2)
  • 1935-1939
  • 2003  (2)
Collection
Keywords
Publisher
Years
  • 2000-2004  (2)
  • 1935-1939
Year
  • 1
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    Geochemistry of Indian Ocean tephra and Afro-Arabian lavas (2003)
    PANGAEA
    In:  Supplement to: Ukstins Peate, Ingrid; Baker, Joel A; Kent, Adam J R; Al-Kadasi, Mohamed; Al-Subbary, Abdulkarim; Ayalew, Dereje; Menzies, Martin (2003): Correlation of Indian Ocean tephra to individual Oligocene silicic eruptions from Afro-Arabian flood volcanism. Earth and Planetary Science Letters, 211(3-4), 311-327, https://doi.org/10.1016/S0012-821X(03)00192-4
    Details
    Publication Date: 2024-01-09
    Description: Widespread silicic pyroclastic eruptions of the Oligocene Afro-Arabian flood volcanic province (ignimbrites and airfall tuffs) produced up to 20% of the total flood volcanic stratigraphy (〉6*10**4 km**3). Volumes of individual ignimbrites and tuffs exposed on land range from ~150 to 〉2000 km**3 and eight major units (15-100 m thick) were erupted in 〈2 Myr, placing these amongst the largest-magnitude silicic pyroclastic eruptions on Earth. They are compositionally distinctive time-stratigraphic markers which were deposited as co-ignimbrite ashfall deposits on a near-global scale around the time of the Oi2 cooling anomaly at ~30 Ma. Two ignimbrites from the lower part of the flood volcanic succession in Yemen have been correlated to: (a) the conjugate rifted margin of Ethiopia (〉500 km distant); and (b) to two deep sea ash layers sampled by ODP Leg 115 in the Indian Ocean ~2700 km to the southeast. This correlation is based on whole rock analyses of silicic units for isotope ratios (Pb, Nd) and rare earth element compositions, in conjunction with novel in situ Pb isotope laser ablation multicollector inductively coupled plasma mass spectroscopy analysis of groundmass and glass shards. Compositional diversity preserved on the scale of individual ash shards in these deep sea tephra layers record chemical heterogeneity present in the silicic magma chambers that is not evident in the welded on-land deposits. Ages of the ash layers can be established by correlation to precisely dated on-land ignimbrites, and current evidence suggests that while these eruptions may have exacerbated already changing climatic conditions, they both marginally post-date the Oi2 global cooling anomaly.
    Keywords: 115-711A; DRILL; Drilling/drill rig; Joides Resolution; Leg115; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 2
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    Evaporation Rate Study and NDMA Formation from UDMH/NO2 Reaction Products (2003)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: Laboratory samples of uns-dimethylhydrazine (UDMH) fuel/oxidizer (nitrogen dioxide) non-combustion reaction products (UFORP) were prepared using a unique permeation tube technology. Also, a synthetic UFORP was prepared from UDMH, N-nitrosodimethylamine (NDMA), dimethylammonium nitrate, sodium nitrite and purified water. The evaporation rate of UFORP and synthetic UFORP was determined under space vacuum (approx 10(exp -3) Torr) at -40 ?C and 0 ?C. The material remaining was analyzed and showed that the UFORP weight and NDMA concentration decreased over time; however, NDMA had not completely evaporated. Over 85% of the weight was removed by subjecting the UFORP to 10(-3) Torr for 7 hours at -40 ?C and 4 hours at 0 ?C. A mixture of dimethylammonium nitrate and sodium nitrite formed NDMA at a rapid rate in a moist air environment. A sample of UFORP residue was analyzed for formation of NDMA under various conditions. It was found that NDMA was not formed unless nitrite was added.
    Keywords: Inorganic, Organic and Physical Chemistry
    Type: JSC-CN-2366 , 20th JANNAF Safety and Environmental Protections Subcommittee (S and EPS) Joint Meeting; Mar 24, 2003 - Mar 27, 2003; Charlottesville, VA; United States|31st JANNAF Propellant Development and Characterization Subcommittee (PDCS) Joint Meeting; Mar 24, 2003 - Mar 27, 2003; Charlottesville, VA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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