Seidemann, David E (1977): K-Ar dating of altered deep-sea igneous rocks from DSDP Legs 2, 34, and 35 [dataset publication series]. Department of Geology and Geophysics, Yale University, PANGAEA, https://doi.org/10.1594/PANGAEA.720975
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Abstract:
In an attempt to establish criteria for obtaining reliable K-Ar dates, conventional K-Ar studies of several Deep Sea Drilling Project sites were undertaken. K-Ar dates of these rocks may be subject to inaccuracies as the result of sea-water alteration. Inaccuracies may also result from the presence of excess radiogenic 40Ar trapped in rapidly cooled rocks at the time of their formation. The results obtained for DSDP Leg 34 basalts indicate that lowering of K-Ar dates, which is related to potassium addition by weathering, is a major cause of uncertainty in obtaining reliable K-Ar dates for deep-sea rocks. It could not be determined if the potassium addition to the basalts occurred at the time of formation, t_o, or continuously from t_o to the present. Calculations show that sediment cover is not a significant barrier to the diffusion of potassium into the basalt. 40Ar loss contributes, at least in part, to the lowering of the K-Ar date in rocks that have added potassium. The meaning of the K-Ar results obtained for DSDP Legs 35 and 2 basalts could not be unambiguously established. Because of the problems involved, caution must be used in interpreting the meaning of conventional K-Ar dates for deep-sea rocks.
Related to:
Seidemann, David E (1977): Effects of submarine alteration on K-Ar dating of deep-sea igneous rocks. Geological Society of America Bulletin, 88(11), 1660-1666, https://doi.org/10.1130/0016-7606(1977)88%3C1660:EOSAOK%3E2.0.CO;2
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: -23.176300 * Median Longitude: -82.612640 * South-bound Latitude: -63.680700 * West-bound Longitude: -101.524300 * North-bound Latitude: 32.862200 * East-bound Longitude: -52.215300
Date/Time Start: 1968-11-02T00:00:00 * Date/Time End: 1974-03-07T00:00:00
Event(s):
2-10 * Latitude: 32.862200 * Longitude: -52.215300 * Date/Time: 1968-11-02T00:00:00 * Elevation: -4712.0 m * Penetration: 459 m * Recovery: 76.3 m * Location: North Atlantic/CONT RISE * Campaign: Leg2 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 18 cores; 153.9 m cored; 18.2 m drilled; 49.6 % recovery
34-319A * Latitude: -13.017300 * Longitude: -101.524300 * Date/Time: 1974-01-05T00:00:00 * Elevation: -4290.0 m * Penetration: 157 m * Recovery: 14.6 m * Location: South Pacific/BASIN * Campaign: Leg34 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 8 cores; 59 m cored; 0 m drilled; 24.7 % recovery
34-321 * Latitude: -12.021500 * Longitude: -81.904000 * Date/Time: 1974-01-29T00:00:00 * Elevation: -4817.0 m * Penetration: 134.5 m * Recovery: 83.5 m * Location: South Pacific/BASIN * Campaign: Leg34 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 13 cores; 123.5 m cored; 0 m drilled; 67.6 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
5 datasets
Download Data
Datasets listed in this publication series
- Seidemann, DE (1977): (Table 4) K-Ar results from DSDP Hole 2-10. https://doi.org/10.1594/PANGAEA.720970
- Seidemann, DE (1977): (Table 2) K-Ar results from DSDP Hole 34-319A. https://doi.org/10.1594/PANGAEA.720971
- Seidemann, DE (1977): (Table 2) K-Ar results from DSDP Hole 34-321. https://doi.org/10.1594/PANGAEA.720972
- Seidemann, DE (1977): (Table 3) K-Ar results from DSDP Hole 35-322. https://doi.org/10.1594/PANGAEA.720973
- Seidemann, DE (1977): (Table 3) K-Ar results from DSDP Hole 35-323. https://doi.org/10.1594/PANGAEA.720974