Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

Bohrmann, Gerhard; Kuhs, Werner F; Klapp, Stephan A; Techmer, Kirsten S; Klein, Helmut; Murshed, Mangir M; Abegg, Friedrich (2007): Hydrate, ice and quartz content of eight holes of Leg 204 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.690903, Supplement to: Bohrmann, G et al. (2007): Appearance and preservation of natural gas hydrate from Hydrate Ridge sampled during ODP Leg 204 drilling. Marine Geology, 244(1-4), 1-14, https://doi.org/10.1016/j.margeo.2007.05.003

Always quote citation above when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

Abstract:
The state of preservation of natural gas hydrate samples, recovered from 6 sites drilled during ODP Leg 204 at southern summit of Hydrate Ridge, Oregon Margin, has been investigated by X-ray diffraction (XRD) and cryo-scanning-electron-microscopy (cryo-SEM) techniques. A detailed characterization of the state of decomposition of gas hydrates is necessary since no pressurized autoclave tools were used for sampling and partial dissociation must have occurred during recovery prior to the quench and storage in liquid nitrogen. Samples from 16 distinct horizons have been investigated by synchrotron X-ray diffraction measurements at HASYLAB/ Hamburg. A full profile fitting analysis (“Rietveld method”) of synchrotron XRD data provides quantitative phase determinations of the major sample constituents such as gas hydrate structure I (sI), hexagonal ice (Ih) and quartz. The ice content (Ih) in each sample is related to frozen water composed of both original existing pore water and the water from decomposed hydrates. Hydrate contents as measured by diffraction vary between 0 and 68 wt.% in the samples we measured. Samples with low hydrate content usually show micro-structural features in cryo-SEM ascribed to extensive decomposition. Comparing the appearance of hydrates at different scales, the grade of preservation seems to be primarily correlated with the contiguous volume of the original existing hydrate; the dissociation front appears to be indicated by micrometer-sized pores in a dense ice matrix.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 44.575314 * Median Longitude: -125.145995 * South-bound Latitude: 44.568430 * West-bound Longitude: -125.152500 * North-bound Latitude: 44.586300 * East-bound Longitude: -125.119830
Date/Time Start: 2002-07-13T12:45:00 * Date/Time End: 2002-08-24T19:15:00
Event(s):
204-1244C * Latitude: 44.586300 * Longitude: -125.119830 * Date/Time Start: 2002-07-13T12:45:00 * Date/Time End: 2002-07-16T05:30:00 * Elevation: -895.1 m * Penetration: 333.5 m * Recovery: 315.5 m * Location: North Pacific Ocean * Campaign: Leg204 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 39 cores; 332 m cored; 1.5 m drilled; 95 % recovery
204-1245B * Latitude: 44.585980 * Longitude: -125.149100 * Date/Time Start: 2002-08-06T07:15:00 * Date/Time End: 2002-08-09T15:45:00 * Elevation: -869.7 m * Penetration: 473.7 m * Recovery: 418.02 m * Location: North Pacific Ocean * Campaign: Leg204 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 53 cores; 471.7 m cored; 2 m drilled; 88.6 % recovery
204-1247B * Latitude: 44.577650 * Longitude: -125.151280 * Date/Time Start: 2002-08-22T06:45:00 * Date/Time End: 2002-08-24T19:15:00 * Elevation: -834.3 m * Penetration: 220 m * Recovery: 211.98 m * Location: North Pacific Ocean * Campaign: Leg204 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 27 cores; 217 m cored; 3 m drilled; 97.7 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
8 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text — use the following character encoding:

Datasets listed in this publication series

  1. Bohrmann, G; Kuhs, WF; Klapp, SA et al. (2007): (Table 1) Hydrate, ice and quartz content of ODP Hole 204-1244C. https://doi.org/10.1594/PANGAEA.690860
  2. Bohrmann, G; Kuhs, WF; Klapp, SA et al. (2007): (Table 1) Hydrate, ice and quartz content of ODP Hole 204-1245B. https://doi.org/10.1594/PANGAEA.690861
  3. Bohrmann, G; Kuhs, WF; Klapp, SA et al. (2007): (Table 1) Hydrate, ice and quartz content of ODP Hole 204-1247B. https://doi.org/10.1594/PANGAEA.690862
  4. Bohrmann, G; Kuhs, WF; Klapp, SA et al. (2007): (Table 1) Hydrate, ice and quartz content of ODP Hole 204-1248C. https://doi.org/10.1594/PANGAEA.690863
  5. Bohrmann, G; Kuhs, WF; Klapp, SA et al. (2007): (Table 1) Hydrate, ice and quartz content of ODP Hole 204-1249C. https://doi.org/10.1594/PANGAEA.690864
  6. Bohrmann, G; Kuhs, WF; Klapp, SA et al. (2007): (Table 1) Hydrate, ice and quartz content of ODP Hole 204-1249F. https://doi.org/10.1594/PANGAEA.690865
  7. Bohrmann, G; Kuhs, WF; Klapp, SA et al. (2007): (Table 1) Hydrate, ice and quartz content of ODP Hole 204-1250C. https://doi.org/10.1594/PANGAEA.690866
  8. Bohrmann, G; Kuhs, WF; Klapp, SA et al. (2007): (Table 1) Hydrate, ice and quartz content of ODP Hole 204-1250D. https://doi.org/10.1594/PANGAEA.690867