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Some Mare Basalts Dated by Two or More Methods

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Apollo 11

(10072 high-K)

Ar-Ar

Ar-Ar

Ar-Ar

Ar-Ar

Ar-Ar

Ar-Ar

Rb-Sr

Sm-Nd whole rock

whole rock

plagioclase

plagioclase

ilmenite

pyroxene

7 isochron

6 isochron 3.49 +/- 0.05

3.52 +/- 0.04

3.57 +/- 0.05

3.56 +/- 0.06

3.58 +/- 0.05

3.55 +/- 0.05

3.57 +/- 0.05

3.57 +/- 0.03

 

 

Apollo 12

(12051 quartz)

Ar-Ar

Ar-Ar

Ar-Ar

Ar-Ar

Rb-Sr

Rb-Sr whole rock

whole rock

whole rock

whole rock

7 isochron

4 isochron 3.13 +/- 0.05

3.12 +/- 0.07

3.23 +/- 0.05

3.25 +/- 0.06

3.19 +/- 0.10

3.09 +/- 0.04

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Apollo 15

(15555 olivine)

Ar-Ar

Ar-Ar

Ar-Ar

Ar-Ar

Ar-Ar

Ar-Ar

Ar-Ar

Rb-Sr

Rb-Sr

Rb-Sr whole rock

whole rock

whole rock

whole rock

whole rock

plagioclase

pyroxene

6 isochron

6 isochron

7 isochron 3.29 +/- 0.05

3.25 +/- 0.06

3.28 +/- 0.06

3.24 +/- 0.06

3.19 +/- 0.02

3.27 +/- 0.02

3.24 +/- 0.09

3.23 +/- 0.08

3.27 +/- 0.09

3.25 +/- 0.04

 

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Apollo 17

(75075 high-Ti)

Ar-Ar

Ar-Ar

Ar-Ar

Ar-Ar

Ar-Ar

Rb-Sr

Sm-Nd whole rock

whole rock

whole rock

plagioclase

plagioclase

8 isochron

4 isochron 3.71 +/- 0.04

3.66 +/- 0.05

3.61 +/- 0.04

3.69 +/- 0.02

3.67 +/- 0.02

3.76 +/- 0.12

3.70 +/- 0.07

 

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The Oldest Lunar Rocks

 

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Apollo 17

(76535 troctolite)

Sm-Nd

Rb-Sr

K-Ar

Ar-Ar

Ar-Ar

Ar-Ar

Ar-Ar 5 isochron

10 isochron

whole rock

whole rock

whole rock

whole rock

plagioclase 4.26 +/- 0.06

4.51 +/- 0.07

4.27 +/- 0.08

4.16 +/- 0.04

4.19 +/- 0.02

4.20 +/- 0.03

4.19 +/- 0.02

 

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Apollo 17

(77215 norite breccia clast)

Sm-Nd

Rb-Sr

Ar-Ar

Ar-Ar

Ar-Ar

Ar-Ar 5 isochron

8 isochron

plagioclase

whole rock

whole rock

whole rock 4.37 +/- 0.07

4.33 +/- 0.04

3.92 +/- 0.03

3.99 +/- 0.03

3.97 +/- 0.03

3.90 +/- 0.03

 

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Apollo 17

(78236 norite)

Sm-Nd

Sm-Nd

Rb-Sr

Ar-Ar 9 isochron

3 isochron

3 isochron

plagioclase 4.34 +/- 0.05

4.43 +/- 0.05

4.29 +/- 0.02

4.36

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