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Table 2 Isotopic datings of xenocrysts and alkali basalt

From: Alkali basalts and enclosed ultramafic xenoliths near Ushuaia, Tierra Del Fuego, Argentina

Sample

K %

40K = ×10−8mol/g

40Arrad = ×10−10mol/g

40Aratm =  %

Age Ma

Analytical error = %

AK 4133 amphibole

1.75

5224

4617

79.10

146 ± 5

3.40

AK 4134 alkali feldspar

2.54

7582

5818

70.80

127 ± 4

3.50

AK 4137 whole rock

2.04

6089

0.296

91.10

8.30 ± 0.30

2.90

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