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Mussett, Alan E; Barker, Peter F (1983): (Table 1) Apparent ages from 40Ar/39Ar heating steps for DSDP Hole 72-516F basalts. PANGAEA,, Supplement to: Mussett, AE; Barker, PF (1983): 40Ar/39Ar age spectra of basalts, Deep Sea Drilling Project Site 516. In: Barker, PF; Carlson, RL; Johnson, DA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 72, 467-470,

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Submarine basalts are difficult to date accurately by the potassium-argon method. Dalrymple and Moore (1968) and Dymond (1970), for example, showed that, when the conventional K-Ar method is used, pillow lavas may contain excess 40Ar. Use of the 40Ar/39Ar step-heating method has not overcome the problem, as had been hoped, and has produced some conflicting results. Ozima and Saito (1973) concluded that the excess 40Ar is retained only in high temperature sites, but Seidemann (1978) found that it could be released at all temperatures. Furthermore, addition of potassium, from seawater, to the rock after it has solidified can result in low ages (Seidemann, 1977), the opposite effect to that of excess 40Ar. Thus, apparent ages may be either greater or less than the age of extrusion. Because of this discouraging record, the present study was approached pragmatically, to investigate whether self-consistent results can be obtained by the 40Ar/39Ar step-heating method.
Latitude: -30.276500 * Longitude: -35.285000
Date/Time Start: 1980-03-11T00:00:00 * Date/Time End: 1980-03-11T00:00:00
Minimum Elevation: -1313.0 m * Maximum Elevation: -1313.0 m
72-516F * Latitude: -30.276500 * Longitude: -35.285000 * Date/Time: 1980-03-11T00:00:00 * Elevation: -1313.0 m * Penetration: 1270.6 m * Recovery: 690.1 m * Location: South Atlantic/CONT RISE * Campaign: Leg72 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 127 cores; 1092.5 m cored; 9 m drilled; 63.2 % recovery
Blanks indicate not measured. 40Ar/30Ar, 39Ar/36Ar, and 37Ar/36Ar ratios corrected for mass discrimination and interfering isotopes.
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Sample code/labelSample labelMussett, Alan EODP sample designation
2PiecePieceMussett, Alan E
3CommentCommentMussett, Alan EIrradiation number
4Heating stepHeating stepMussett, Alan E
5Temperature, technicalT tech°CMussett, Alan E#0 = fusion
6ArgonAr%Mussett, Alan ERadiogenic; # = a zero measured 36Ar caused these results
7Argon-3939Ar%Mussett, Alan EReleased; = percentage of total released over steps measured
8CorrectioncorrMussett, Alan EInterfering isotopes
9Argon-40/Argon-3640Ar/36ArMussett, Alan E# = a zero measured 36Ar caused these results
10Argon-39/Argon-3639Ar/36ArMussett, Alan E# = a zero measured 36Ar caused these results
11Argon-37/Argon-3637Ar/36ArMussett, Alan E# = a zero measured 36Ar caused these results
12Age, datedAge datedkaMussett, Alan EApparent
13Age, standard deviationAge std dev±Mussett, Alan EApparent
499 data points

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