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Journal of Analytical Science and Technology

Table 5 40Ar/39Ar age spectrum data for aliquots of representative samples

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

 

Watt

Ca/K

Cl/K

36Ar/39Ar

%36Ar(Ca)

40Ar*/39Ar

Mol39Ar(× 10−16)

% step

Cum %

%40Ar*

Age (Ka)

± Age

141006-1, Run ID# 689-01 (J = 0.0002755 ± 0.0000008):

*689-01A

0.3

2.543

0.141

0.00279

12.3

1.0068

0.0076

4.4

4.4

58.2

500

98

*689-01B

0.8

1.810

-0.008

0.00099

24.7

1.0356

0.0709

40.7

45.1

82.5

515

11

*689-01C

1.2

3.183

-0.022

0.00137

31.5

1.0338

0.0396

22.7

67.8

78.9

514

18

*689-01D

1.7

8.023

-0.024

0.00247

44.0

1.1125

0.0166

9.5

77.3

73.1

553

42

*689-01E

2.5

6.900

-0.028

0.00253

36.9

1.0214

0.0283

16.2

93.5

68.4

508

29

*689-01F

3.5

17.215

0.232

0.00417

55.8

1.6478

0.0037

2.1

95.7

75.1

819

218

*689-01G

4.0

13.151

0.039

0.00556

31.9

0.6983

0.0056

3.2

98.9

38.3

347

119

*689-01H

4.7

12.711

0.364

0.02289

7.5

0.2635

0.0020

1.1

100

4

131

342

Integrated Age=

          

513

13

(*) Plateau Age =

          

515

9

141006-1, Run ID# 689-02 (J = 0.0002755 ± 0.0000008):

*689-02A

0.3

2.958

0.247

0.00221

18.1

1.0315

0.0080

4.3

4.3

65.9

513

87

*689-02B

0.8

1.812

0.001

0.00098

25.0

1.0513

0.0823

44.4

48.8

82.9

522

9

*689-02C

1.2

2.614

− 0.024

0.00122

29.0

1.0565

0.0368

19.9

68.7

80.5

525

19

*689-02D

1.7

5.688

0.009

0.00206

37.4

1.0581

0.0389

21

89.7

73.5

526

24

*689-02E

2.5

12.085

− 0.159

0.00452

36.1

1.0797

0.0097

5.3

94.9

55.7

537

74

*689-02F

3.5

12.451

0.003

0.00506

33.2

1.2264

0.0053

2.9

97.8

55

609

132

*689-02G

4.0

13.229

0.065

0.00546

32.8

1.2411

0.0040

2.2

100

53.2

617

181

Integrated Age =

          

528

12

(*) Plateau Age =

          

524

8

141006-1, Run ID# 689-03 (J = 0.0002755 ± 0.0000008):

689-03A

0.3

5.559

0.993

0.00712

10.5

1.0134

0.0025

0.5

0.5

35.1

504

249

689-03B

0.6

2.323

0.031

0.00285

11.0

0.8972

0.0401

8.5

8.5

54.5

446

18

*689-03C

1.1

1.699

− 0.028

0.00123

18.7

1.0487

0.1118

23.8

32.3

78

521

7

*689-03D

1.7

2.356

− 0.003

0.00147

21.6

1.0626

0.1462

31.1

63.5

75.7

528

6

*689-03E

2.5

4.685

0.000

0.00197

32.2

1.0509

0.0828

17.6

81.1

72.7

522

11

*689-03F

3.5

6.940

0.004

0.00251

37.4

1.0204

0.0645

13.7

94.8

68.7

507

13

*689-03G

4.0

9.741

− 0.128

0.00335

39.3

1.1082

0.0142

3

97.8

64.7

551

48

*689-03H

4.6

14.580

0.095

0.00432

45.6

1.0931

0.0103

2.2

100

61

543

68

Integrated Age =

         

516

5

(*) Plateau Age =

         

523

4

141006-2A, Run ID# 690-01 (J = 0.000273 ± 0.0000008):

690-01A

0.3

2.342

0.150

0.00351

9.0

-0.2883

0.0056

3.3

3.3

-44

-142

167

*690-01B

0.8

2.100

0.003

0.00093

30.6

0.3848

0.0586

34.2

37.5

66.9

190

16

*690-01C

1.2

2.407

0.011

0.00116

28.1

0.3814

0.0437

25.6

63.1

60.8

188

15

*690-01D

1.7

3.471

0.049

0.00151

31.1

0.4060

0.0364

21.3

84.4

57

200

18

*690-01E

2.5

8.860

− 0.013

0.00341

35.1

0.3906

0.0134

7.9

92.2

37.3

192

56

*690-01F

3.5

11.886

0.132

0.00309

52.0

0.4437

0.0094

5.5

97.7

50.2

219

77

*690-01G

4.0

16.954

− 0.050

0.00434

52.8

0.1473

0.0040

2.3

100

19.4

73

145

690-01H

4.7

17.297

− 1.371

0.00510

45.9

− 0.0825

0.0013

0.8

100

− 10.9

− 41

422

Integrated Age =

          

179

13

(*) Plateau Age =

       

96.7

  

192

9

141006-2A, Run ID# 690-02 (J = 0.000273 ± 0.0000008):

*690-02A

0.3

2.832

0.074

0.00215

17.8

0.4007

0.0055

3.6

3.6

43.5

197

116

*690-02B

0.8

2.563

0.002

0.00117

29.5

0.3555

0.0439

29

32.6

59.3

175

15

*690-02C

1.2

2.487

− 0.020

0.00104

32.2

0.3950

0.0414

27.3

59.9

65.4

195

17

*690-02D

1.7

4.289

0.014

0.00197

29.4

0.3286

0.0385

25.4

85.3

44.4

162

23

*690-02E

2.5

11.130

− 0.290

0.00440

34.2

0.2072

0.0112

7.4

92.6

19.3

102

68

*690-02F

3.5

14.029

− 0.306

0.00489

38.8

0.2804

0.0076

5

97.6

23.9

138

96

*690-02G

4.0

17.476

− 0.552

0.00561

42.1

0.0155

0.0036

2.4

100

1.6

8

169

690-02H

4.7

13.973

− 0.789

0.00401

47.1

− 0.3665

0.0014

0.9

100

− 133.7

− 181

423

Integrated Age =

          

166

13

(*) Plateau Age =

       

100

  

177

10

141006-2A, Run ID# 690-03 (J = 0.000273 ± 0.0000008):

*690-03A

0.6

2.866

0.027

0.00196

19.8

0.2779

0.0233

5.2

5.2

37.4

137

31

*690-03B

1.1

2.271

− 0.002

0.00128

23.9

0.3312

0.0882

19.6

24.7

53.4

163

11

*690-03C

1.7

2.263

− 0.005

0.00121

25.4

0.3457

0.1287

28.6

53.3

56.5

170

6

*690-03D

2.5

3.164

0.006

0.00137

31.2

0.3530

0.1065

23.6

77

55.9

174

8

*690-03E

3.5

4.796

− 0.063

0.00182

35.5

0.3560

0.0668

14.8

91.8

50.5

175

12

*690-03F

4.0

6.393

0.012

0.00204

42.3

0.4261

0.0281

6.2

98

54.9

210

25

*690-03G

4.6

6.719

0.132

0.00215

42.2

0.3207

0.0090

2

100

46.7

158

77

Integrated. Age =

          

171

5

(*) Plateau Age =

       

100

  

171

4

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