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  • 1
    Electronic Resource
    Electronic Resource
    Geology of the summit limestone of Mount Qomolangma (Everest) and cooling history of the Yellow Band under the Qomolangma detachment (2005)
    Melbourne, Australia : Blackwell Science Pty
    The @island arc 14 (2005), S. 0 
    Details
    ISSN: 1440-1738
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Abstract  Newly discovered peloidal limestone from the summit of Mount Qomolangma (Mount Everest) contains skeletal fragments of trilobites, ostracods and crinoids. They are small pebble-sized debris interbedded in micritic bedded limestone of the Qomolangma Formation, and are interpreted to have been derived from a bank margin and redeposited in peri-platform environments. An exposure of the Qomolangma detachment at the base of the first step (8520 m), on the northern slope of Mount Qomolangma was also found. Non-metamorphosed, strongly fractured Ordovician limestone is separated from underlying metamorphosed Yellow Band by a sharp fault with a breccia zone. The 40Ar–39Ar ages of muscovite from the Yellow Band show two-phase metamorphic events of approximately 33.3 and 24.5 Ma. The older age represents the peak of a Barrovian-type Eo-Himalayan metamorphic event and the younger age records a decompressional high-temperature Neo-Himalayan metamorphic event. A muscovite whole-rock 87Rb–86Sr isochron of the Yellow Band yielded 40.06 ± 0.81 Ma, which suggests a Pre-Himalayan metamorphism, probably caused by tectonic stacking of the Tibetan Tethys sediments in the leading margin of the Indian subcontinent. Zircon and apatite grains, separated from the Yellow Band, gave pooled fission-track ages of 14.4 ± 0.9 and 14.4 ± 1.4 Ma, respectively. These new chronologic data indicate rapid cooling of the hanging wall of the Qomolangma detachment from approximately 350°C to 130°C during a short period (15.5–14.4 Ma).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1738.2005.00499.x
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    Paper (German National Licenses)
    Fulltext
  • 2
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    (Table 1) 40Ar/39Ar geochronology at DSDP Hole 89-462A
    PANGAEA
    In:  Supplement to: Takigami, Yutaka; Amari, Sachiko; Ozima, Minoru; Moberly, Ralph (1986): 40Ar/39Ar geochronological studies of basalts from Hole 462A, Nauru Basin, Deep Sea Drilling Project Leg 89. In: Moberly, R; Schlanger, SO; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 89, 519-521, https://doi.org/10.2973/dsdp.proc.89.119.1986
    Details
    Publication Date: 2023-06-27
    Description: 40Ar/39Ar geochronological studies were performed on basalts taken from the bottom of Hole 462A. An age of 129.7 ± 4.6 Ma was obtained for two temperature fractions (800 and 1000°C) of Sample 462A-109-1, 106-108 cm. That age is between the age of the oceanic basement, as deduced from the magnetic anomaly data, and the age of interlayered sediment, as deduced from the sparse fossil content.
    Keywords: 89-462A; Age, 40Ar/39Ar Argon-Argon; Age, dated; Age, dated standard deviation; Argon-40; Calculated; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Estimated; Glomar Challenger; Leg89; North Pacific; Potassium; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 18 data points
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    DATA PANGAEA
  • 3
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    (Table 1) Step-heating degassing data for argon-39 in volcanic rock from DSDP Hole 58-443
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 58-443; Argon-36/Argon-39; Argon-36/Argon-39, standard deviation; Argon-39; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Leg58; North Pacific/BASIN; Sample code/label; Sample type; Temperature, technical
    Type: Dataset
    Format: text/tab-separated-values, 72 data points
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    DATA PANGAEA
  • 4
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    (Table 1) Step-heating degassing data for argon-39 in volcanic rock from DSDP Hole 60-458
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 60-458; Argon-36/Argon-39; Argon-36/Argon-39, standard deviation; Argon-39; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Leg60; North Pacific/TRENCH; Sample code/label; Sample type; Temperature, technical
    Type: Dataset
    Format: text/tab-separated-values, 36 data points
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    DATA PANGAEA
  • 5
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    (Table 1) Step-heating degassing data for argon-39 in volcanic rock from DSDP Hole 58-446A
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 58-446A; Argon-36/Argon-39; Argon-36/Argon-39, standard deviation; Argon-39; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Leg58; North Pacific/Philippine Sea/BASIN; Sample code/label; Sample type; Temperature, technical
    Type: Dataset
    Format: text/tab-separated-values, 36 data points
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    DATA PANGAEA
  • 6
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    (Table 2) 40Ar-39Ar ages at DSDP Holes 60-458 and 60-459
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: -; 60-458; 60-459; Age, 40Ar/39Ar Argon-Argon; Age, dated; Age, dated standard deviation; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Leg60; North Pacific/SEDIMENT POND; North Pacific/TRENCH; Sample code/label; Standard deviation; Sum
    Type: Dataset
    Format: text/tab-separated-values, 20 data points
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    DATA PANGAEA
  • 7
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    (Table 2) Analytical data for step-heating experiments at DSDP Hole 58-445 and 58-446A
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: -; 58-445; 58-446A; Age, 40Ar/39Ar Argon-Argon; Age, dated; Age, dated standard deviation; Argon-37/Argon-36; Argon-37/Argon-36, error, relative; Argon-39; Argon-39/Argon-36; Argon-39/Argon-36, error, relative; Argon-40/Argon-36; Argon-40/Argon-36, error, relative; Calculated; Comment; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Leg58; North Pacific/BASIN; North Pacific/Philippine Sea/BASIN; Sample code/label; see reference(s); Temperature, technical
    Type: Dataset
    Format: text/tab-separated-values, 364 data points
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  • 8
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    (Table 3) Total fusion ages and isochron data at DSDP Leg 58 Holes
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: -; 58-443; 58-445; 58-446A; Age, 40Ar/39Ar Argon-Argon; Age, dated; Age, dated standard deviation; Argon-40/Argon-36; Argon-40/Argon-36, error, relative; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Event label; Glomar Challenger; Latitude of event; Leg58; Longitude of event; North Pacific/BASIN; North Pacific/Philippine Sea/BASIN; Number; Rock type; Sample code/label; see reference(s); Sum
    Type: Dataset
    Format: text/tab-separated-values, 60 data points
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    DATA PANGAEA
  • 9
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    (Table 1) Age analysis at DSDP Hole 57-439
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 57-439; Age, 40Ar/39Ar Argon-Argon; Age, dated; Age, dated standard deviation; Argon-37/Argon-36; Argon-39; Argon-39/Argon-36; Argon-39/Argon-36, error, relative; Argon-40/Argon-36; Argon-40/Argon-36, error, relative; Coefficient; Comment; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Leg57; Mineral name; North Pacific/TRENCH; Sample code/label; Temperature, technical
    Type: Dataset
    Format: text/tab-separated-values, 251 data points
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  • 10
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    Step-heating degassing data for argon-39 from volcanic rocks drilled in the Shikoku Basin and Mariana trench, DSDP Legs 58 and 60
    PANGAEA
    In:  Supplement to: Ozima, Minoru; Takigami, Yutaka (1980): Activation energy for thermal release of Ar from some DSDP submarine rocks. Geochimica et Cosmochimica Acta, 44(1), 141-144, https://doi.org/10.1016/0016-7037(80)90185-4
    Details
    Publication Date: 2023-06-27
    Description: From the experimental data on stepwise thermal release of neutron induced 39Ar (39K (n, p) 39Ar) from rocks and minerals, Arrhenius plots were constructed, which gave activation energies for the thermal release process. The activation energies for DSDP Leg 58 and Leg 60 submarine volcanic rocks range from 12 to 20 kcal/mol, whereas those for granodiorites and the K-feldspar separates have activation energies ranging from 37 to 48 kcal/mol. The smaller activation energies for the submarine volcanic rocks reflect the grain boundary diffusion process, while the thermal diffusion of 39Ar from granodiorites and K-feldspar is essentially controlled by a volume diffusion. The grain boundary diffusion for the submarine volcanic rocks suggests that K resides essentially in the grain boundaries.
    Keywords: 58-443; 58-446A; 60-458; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg58; Leg60; North Pacific/BASIN; North Pacific/Philippine Sea/BASIN; North Pacific/TRENCH
    Type: Dataset
    Format: application/zip, 3 datasets
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