Journal of Analytical Science and Technology

Table 1 Ar isotope analyses of representative aliquots of basaltic rock

From: Improvement of ⁴⁰Ar/³⁹Ar age determinations for Quaternary basaltic rocks by eliminating the peak suppression effect

Sample ID	Previous protocol						Modified protocol
	564-06			564-11			642-02			642-06
	fAmp	±1 sd	% sd	fAmp	± 1 sd	% sd	fAmp	± 1 sd	% sd	fAmp	± 1 sd	% sd
⁴⁰Ar	67.0140	1.7411	2.6	67.8663	1.1595	1.71	86.1921	0.0603	0.07	116.0573	0.0834	0.07
³⁹Ar	8.5231	0.1577	1.85	9.4345	0.1515	1.61	10.7780	0.0672	0.62	19.9844	0.0997	0.05
³⁸Ar	0.1148	0.1500	130.66	0.1114	0.1744	156.62	0.0126	0.0627	497.12	0.4681	0.0662	14.15
³⁷Ar	2.7807	0.1111	3.99	3.1500	0.1296	4.12	7.6974	0.0599	0.78	10.4150	0.0550	0.53
³⁶Ar	0.1821	0.0078	4.29	0.1978	0.0072	3.62	0.2830	0.0026	0.93	0.3733	0.0035	0.93
Moles (⁴⁰Ar)	2.22E−15			2.25E−15			2.86E−15			3.85E−15
%⁴⁰Ar*	20.8			15.2			4.5			6.9
Ca/K	2.197			2.301			3.033			2.739
Age (Ka)	0.82			0.55			0.19			0.21
± 1 sd	0.17			0.13			0.04			0.03
% sd	20.37			23.25			20.69			13.41

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