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Ion microprobe (SHRIMP) dating of detrital zircon grains from quartzites of the Eckergneiss Complex, Harz Mountains (Germany): implications for the provenance and the geological history

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Abstract

The Eckergneiss Complex (EGC) is a geologically unique medium- to high-grade metamorphic unit within the Rhenohercynian domain of the Mid-European Variscides. A previously, poorly defined conventional lower U–Pb intercept age of about 560 Ma from detrital zircons of metasedimentary rocks has led to speculations about an East Avalonian affinity of the EGC. In order to unravel the provenance and to constrain the age of the sediment protolith, we carried out sensitive high-resolution ion microprobe U–Pb analyses on detrital zircons from five different EGC quartzite occurrences. The obtained age spectrum indicates a SW Baltica provenance of the detritus. Sveconorwegian ages between 0.9–1.2 Ga are particularly well represented by analyses from metamorphic recrystallization/alteration zones penetrating into igneous zircon. Cadomian (Pan-African) ages, which might reflect a metamorphic event, could not be substantiated. Instead, zircons of igneous origin yielded concordant Lower Devonian and Silurian ages of 410±10, 419±10, and 436±6 Ma (1σ), implying that sedimentation of the EG protolith must have taken place after 410±10 Ma. The lower age limit of the EGC metamorphism is constrained by 295 Ma intrusion ages of the adjacent, nonmetamorphosed Harzburg Gabbronorite and Brocken Granite. Sedimentation and metamorphism must thus have taken place between about 410 Ma and 295 Ma. Given that this time span coincides with most of the sedimentation within the virtually nonmetamorphosed (lowest grade) Rhenohercynian in the Harz Mountains, including the direct vicinity of the EGC, along with the high-grade metamorphism, the EGC can hardly be seen as uplifted local basement. A possible candidate for the root region is an easterly, concealed marginal segment of the Rhenohercynian domain of the Variscides, which is tectonically overridden and suppressed by the Mid-German Crystalline Rise during continent collision. However, based on the concept of strike-slip movement of Variscan terranes with different P–T–t histories as a result of postaccretion intraplate deformation, the EGC could also represent a fault-bounded complex with an origin located far east or south east of the present location.

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Notes

  1. Recalculated using the decay constants recommended by Steiger and Jäger (1977)

  2. Note that we have obtained 66 concordant ages, which means that we can state with a 95% certainty that a possible Archean component must be smaller that 8% (see Vermeesch 2004).

  3. See footnote 2.

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Acknowledegments

Dr. W. Wegener (Nationalpark Hochharz) and K. Surkau (Nationalpark Harz) are kindly acknowledged for permitting us to take rock samples from the EGC area. J. Richards, B. Stütze, and E. Thun are thanked for mineral separation. We would also like to thank J. Schlüter for leaving samples at our disposal and for many fruitful discussions. Critical comments on an earlier draft of the manuscript by A. Krohe and very constructive reviews of G. Zulauf and an anonymous reviewer are appreciated. We are also grateful to the Deutsche Forschungsgemeinschaft (project VI 88/2-1 to RV and TG) and the Deutsche Akademische Austauschdienst (scholarship no. A/99/07919 to NMG) for their financial support.

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Authors and Affiliations

  1. Mineralogisches Institut, Universität Münster, Corrensstr. 24, 48149, Münster, Germany

    Thorsten Geisler

  2. Mineralogisch-Petrographisches Institut der Universität Hamburg, Grindelallee 48, 20146, Hamburg, Germany

    Roland Vinx & Nergui Martin-Gombojav

  3. School of Applied Geology, Curtin University of Technology, GPO Box U 1987, Perth, 6845, WA, Australia

    Robert T. Pidgeon

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  1. Thorsten Geisler
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  2. Roland Vinx
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  3. Nergui Martin-Gombojav
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  4. Robert T. Pidgeon
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Correspondence to Thorsten Geisler.

Appendix

Appendix

SHRIMP data of detrital zircon grains from five quartzite samples of the EGC

Spot

U (ppm)

Th (ppm)

Pb (ppm)

204Pb/206Pb

207Pb/206Pb

±1σ

208Pb/232Th

±1σ

207Pb/235U

±1σ

206Pb/238U

±1σ

206Pb/238U age (Ma)

±1σ

207Pb/235U age (Ma)

±1σ

207Pb/206Pb age (Ma)

±1σ

208Pb/232Th age (Ma)

±1σ

Best age estimatea (Ma)

±1σ

Sample 99-38

 Z1-1

128

86

46

0.00011

0.1057

0.0009

0.0904

0.0017

4.691

0.087

0.3220

0.0050

1,799

24

1,766

16

1726

16

1,750

32

1,745

14

 Z1-2

166

62

62

0.00017

0.1083

0.0009

0.1031

0.0022

5.322

0.096

0.3563

0.0054

1,964

26

1,872

15

1,772

14

1,983

40

–

–

 Z12-1

825

43

71

0.00058

0.0618

0.0014

0.0324

0.0052

0.758

0.032

0.0889

0.0030

549

18

573

19

668

47

644

101

961

55

 Z12-2

1017

86

118

0.00079

0.0675

0.0012

0.0266

0.0038

1.105

0.044

0.1188

0.0040

723

23

756

21

853

38

530

75

–

–

 Z12-3

1,196

339

135

0.00109

0.0637

0.0014

0.0317

0.0016

0.944

0.040

0.1075

0.0036

658

21

675

21

732

47

631

31

–

–

 Z14-1

202

78

31

0.00192

0.0696

0.0039

0.0394

0.0034

1.298

0.090

0.1353

0.0046

818

26

845

40

916

116

780

67

–

–

 Z15-1

103

85

11

0.00022

0.0591

0.0027

0.0285

0.0009

0.740

0.038

0.0908

0.0015

560

9

563

22

571

100

568

17

566

6

 Z15-2

216

153

22

0.00014

0.0584

0.0013

0.0288

0.0006

0.746

0.021

0.0926

0.0014

571

8

566

12

545

48

574

12

–

–

 Z16-1

92

62

19

0.00013

0.0894

0.0017

0.0568

0.0014

2.294

0.060

0.1861

0.0030

1,100

16

1,210

19

1,413

36

1,117

27

–

–

 Z18-1

652

256

188

0.00028

0.0988

0.0008

0.0724

0.0027

3.732

0.132

0.2739

0.0091

1560

46

1,578

28

1,602

15

1,413

50

1,599

14

 Z18-2

350

156

91

0.00031

0.0983

0.0011

0.0695

0.0027

3.296

0.121

0.2432

0.0082

1,403

42

1,480

29

1,592

21

1,358

51

–

–

 Z20-1

204

122

61

0.00117

0.0954

0.0023

0.0683

0.0032

3.408

0.149

0.2590

0.0088

1,485

45

1,506

34

1,536

45

1,335

61

1,511

34

 Z2-1

728

268

132

0.00006

0.0755

0.0004

0.0519

0.0009

1.857

0.031

0.1784

0.0026

1,058

14

1,066

11

1,081

11

1,022

17

1,073

10

 Z21-1

195

122

16

0.00236

0.0563

0.0063

0.0204

0.0018

0.527

0.064

0.0680

0.0024

424

14

430

42

463

249

409

35

419

10

 Z21-2

192

120

15

0.00063

0.0616

0.0042

0.0223

0.0013

0.567

0.046

0.0668

0.0023

417

14

456

30

660

148

446

26

–

–

 Z25-1

1,079

1,038

270

0.00000

0.0829

0.0002

0.0628

0.0009

2.428

0.037

0.2124

0.0031

1,242

17

1,251

11

1,267

6

1,230

18

1,267

6

 Z26-1

248

170

21

0.00354

0.0439

0.0066

0.0179

0.0016

0.391

0.062

0.0646

0.0023

404

14

335

45

0

28

360

31

410

10

 Z26-2

242

164

19

0.00182

0.0465

0.0051

0.0185

0.0014

0.428

0.051

0.0667

0.0023

416

14

362

36

37

234

371

27

–

–

 Z28-1

109

84

35

0.00050

0.1093

0.0028

0.0815

0.0037

4.051

0.185

0.2687

0.0094

1,534

48

1,644

37

1,788

46

1,584

69

–

–

 Z29-1

204

143

53

0.00115

0.0859

0.0025

0.0632

0.0029

2.646

0.126

0.2233

0.0076

1,299

40

1,314

35

1,337

57

1,238

55

1,311

35

 Z30-1

395

210

127

0.00036

0.0996

0.0009

0.0856

0.0031

4.025

0.144

0.2931

0.0098

1,657

49

1,639

29

1,616

17

1,661

58

1,620

17

 Z31-1

274

155

76

0.00075

0.0918

0.0016

0.0664

0.0028

3.126

0.125

0.2471

0.0083

1,423

43

1,439

31

1462

33

1,299

52

1,448

28

 Z32-1

24

19

7

0.00761

0.0943

0.0227

0.0631

0.0113

2.088

0.525

0.1607

0.0077

961

42

1,145

174

1,513

469

1,236

214

956

42

 Z34-1

1,195

430

127

0.00054

0.0691

0.0012

0.0309

0.0013

0.966

0.038

0.1014

0.0034

623

20

686

20

902

35

616

25

–

–

 Z34-2

1,076

373

164

0.00025

0.0725

0.0008

0.0455

0.0017

1.484

0.054

0.1485

0.0049

892

28

924

22

1,000

23

898

33

–

–

 Z35-1

113

66

24

0.00261

0.0728

0.0052

0.0502

0.0040

1.713

0.143

0.1708

0.0060

1,016

33

1,014

54

1,007

146

991

77

1,016

33

 Z36-1

160

139

34

0.00347

0.0678

0.0065

0.0428

0.0031

1.481

0.156

0.1583

0.0055

947

31

923

64

863

198

847

61

947

31

 Z37-1

350

143

102

0.00001

0.1048

0.0006

0.0880

0.0031

3.946

0.137

0.2731

0.0091

1556

46

1,623

28

1,711

11

1,704

57

–

–

 Z38-1

31

32

12

0.01463

0.0469

0.0295

0.0445

0.0117

1.116

0.711

0.1726

0.0085

1,027

47

761

355

49

1,055

879

226

1,028

47

 Z39-1

430

96

101

0.00097

0.0878

0.0014

0.0659

0.0039

2.710

0.106

0.2238

0.0075

1,302

39

1,331

29

1,379

32

1,289

73

1,350

26

 Z40-1

236

64

66

0.00125

0.0836

0.0022

0.0787

0.0053

2.972

0.134

0.2580

0.0087

1,480

45

1,401

34

1,282

51

1,530

100

1,391

35

 Z4-1

363

213

103

0.00061

0.0933

0.0012

0.0708

0.0027

3.258

0.122

0.2532

0.0085

1,455

44

1,471

29

1,494

25

1,382

51

1,486

23

 Z41-1

216

111

58

0.00169

0.0889

0.0027

0.0623

0.0035

2.862

0.139

0.2336

0.0079

1,353

41

1,372

36

1,402

59

1,222

67

1,368

36

 Z42-1

163

75

37

0.00149

0.0749

0.0032

0.0588

0.0038

2.089

0.120

0.2023

0.0069

1,188

37

1,145

40

1,066

85

1,154

72

1,169

35

 Z43-1

160

89

52

0.00131

0.1080

0.0030

0.0839

0.0045

4.142

0.194

0.2782

0.0095

1,582

48

1,663

38

1,766

51

1,629

84

1,661

38

 Z45-1

605

103

165

0.00032

0.0988

0.0008

0.0482

0.0029

3.759

0.132

0.2761

0.0092

1,572

46

1,584

28

1,601

15

951

56

1,599

14

 Z5-1

346

125

70

0.00003

0.0782

0.0005

0.0609

0.0011

2.121

0.037

0.1966

0.0030

1,157

16

1,156

12

1,153

14

1,195

21

1,155

11

 Z6-1

19

38

5

0.00107

0.0663

0.0105

0.0527

0.0029

1.650

0.270

0.1805

0.0046

1,070

25

989

104

816

336

1,038

56

1,070

25

 Z8-1

471

299

110

0.00052

0.0800

0.0012

0.0615

0.0023

2.292

0.088

0.2078

0.0069

1,217

37

1,210

27

1,197

30

1,206

43

1,205

25

Sample 0-40

 Z10-1

1,276

417

225

0.00002

0.0743

0.0002

0.0531

0.0008

1.786

0.028

0.1743

0.0026

1,036

14

1,040

10

1,050

7

1,046

16

1,048

6

 Z1-1

213

89

39

0.00018

0.0694

0.0009

0.0497

0.0011

1.684

0.035

0.1759

0.0027

1,045

15

1,002

13

911

26

979

22

1,045

15

 Z11-1

160

93

34

0.00642

0.0727

0.0051

0.0147

0.0031

1.525

0.114

0.1520

0.0025

912

14

940

46

1,007

144

295

61

1,089

49 b

 Z11-2

3,477

371

377

0.00062

0.0758

0.0004

0.0271

0.0009

1.153

0.018

0.1103

0.0016

675

9

779

9

1,089

10

541

18

–

–

 Z14-1

876

204

162

0.00014

0.0789

0.0004

0.0561

0.0010

2.014

0.032

0.1852

0.0027

1,095

15

1,120

11

1,169

9

1,104

19

–

–

 Z15-1

119

85

27

0.00002

0.0803

0.0011

0.0628

0.0013

2.253

0.050

0.2036

0.0032

1,195

17

1,198

16

1,203

27

1,231

24

1,197

15

 Z17-1

103

21

15

0.00449

0.0765

0.0085

0.0508

0.0105

1.181

0.143

0.1119

0.0041

684

24

792

67

1,108

224

1,001

202

–

–

 Z18-1

681

145

115

0.00089

0.0761

0.0012

0.0476

0.0026

1.714

0.066

0.1634

0.0055

976

30

1,014

25

1,097

32

939

50

1,031

24

 Z19-1

535

121

88

-0.00004

0.0854

0.0006

0.0625

0.0022

1.927

0.068

0.1636

0.0055

977

31

1,090

24

1,324

13

1,225

43

–

–

 Z2-1

166

24

31

0.00011

0.0809

0.0009

0.0496

0.0024

2.125

0.042

0.1906

0.0029

1,125

16

1,157

14

1,218

21

978

47

–

–

 Z3-1

73

42

21

0.00022

0.0923

0.0015

0.0789

0.0021

3.299

0.080

0.2593

0.0042

1,486

22

1,481

19

1,473

31

1,536

39

1,482

19

 Z4-1

402

95

113

0.00129

0.0909

0.0017

0.0776

0.0049

3.281

0.132

0.2618

0.0088

1,499

45

1,476

31

1,444

35

1,510

91

1,464

31

 Z7-1

42

17

13

0.00006

0.0989

0.0020

0.0853

0.0034

3.841

0.107

0.2816

0.0049

1,600

25

1,601

22

1,604

37

1,654

63

1,601

22

 Z8-1

384

21

94

0.00004

0.0912

0.0005

0.0657

0.0040

3.219

0.053

0.2562

0.0038

1,470

20

1,462

13

1,450

10

1,286

76

1,454

10

 Z9-1

61

22

11

0.00019

0.0697

0.0029

0.0516

0.0034

1.701

0.080

0.1769

0.0030

1,050

16

1,009

30

920

86

1,017

65

1,047

16

Sample 0-12

 Z1-1

131

50

27

0.00008

0.0756

0.0012

0.0615

0.0017

2.100

0.049

0.2015

0.0032

1,184

17

1,149

16

1,084

31

1,207

33

1,162

15

 Z2-1

312

235

25

0.00034

0.0507

0.0015

0.0220

0.0005

0.489

0.017

0.0700

0.0011

436

7

404

12

227

68

441

10

436

5

 Z2-2

449

290

34

0.00002

0.0555

0.0010

0.0222

0.0004

0.535

0.013

0.0700

0.0011

436

6

435

9

431

40

444

9

–

–

 Z3-1

69

29

14

0.00031

0.0731

0.0023

0.0561

0.0026

1.961

0.072

0.1945

0.0032

1,146

17

1,102

25

1,017

62

1,104

50

1,138

17

 Z4-1

27

14

6

0.00048

0.0771

0.0047

0.0611

0.0045

2.263

0.150

0.2129

0.0043

1,244

23

1,201

47

1,124

121

1,199

86

1,242

22

 Z4-2

140

75

36

0.00009

0.0852

0.0010

0.0716

0.0015

2.835

0.057

0.2414

0.0037

1,394

19

1,365

15

1,320

22

1,398

29

1,361

15

Sample 0-100

 Z14-1

314

143

51

0.00018

0.0720

0.0009

0.0500

0.0010

1.515

0.031

0.1526

0.0023

915

13

937

13

987

25

986

20

–

–

 Z14-2

70

23

21

0.00011

0.0964

0.0017

0.0858

0.0034

3.892

0.099

0.2928

0.0048

1,656

24

1,612

21

1,555

33

1,664

64

1,621

20

 Z15-1

297

99

53

0.00007

0.0751

0.0007

0.0534

0.0011

1.824

0.034

0.1761

0.0027

1046

15

1,054

12

1,071

18

1,051

21

1,055

12

 Z2-1

64

72

21

0.00013

0.0909

0.0016

0.0785

0.0017

3.312

0.083

0.2642

0.0043

1,511

22

1,484

20

1,445

33

1,528

31

1,491

19

 Z3-1

137

60

39

0.00149

0.0927

0.0031

0.0703

0.0047

3.212

0.164

0.2512

0.0086

1,445

44

1,460

39

1,483

64

1,374

89

1,456

39

 Z4-1

387

147

107

0.00083

0.0928

0.0016

0.0719

0.0033

3.278

0.129

0.2561

0.0086

1,470

44

1,476

31

1,484

32

1,404

63

1,480

27

 Z7-1

99

36

20

0.00272

0.0786

0.0056

0.0536

0.0062

1.843

0.155

0.1701

0.0060

1,013

33

1,061

55

1,162

142

1,056

120

1,015

33

 Z8-1

178

35

43

0.00103

0.0862

0.0024

0.0567

0.0065

2.752

0.129

0.2314

0.0079

1,342

41

1,343

35

1,344

54

1,114

125

1,343

35

Sample 99-20

 Z1-1

215

86

66

0.00007

0.1007

0.0007

0.0855

0.0017

4.023

0.071

0.2896

0.0044

1,640

22

1,639

14

1,638

13

1,658

31

1,638

12

 Z1-2

244

121

79

0.00007

0.1012

0.0005

0.0886

0.0015

4.159

0.069

0.2981

0.0045

1,682

22

1,666

14

1,646

10

1,716

28

1,651

10

 Z13-1

124

49

25

0.00136

0.0785

0.0036

0.0518

0.0042

1.979

0.121

0.1829

0.0063

1,083

35

1,108

41

1,159

92

1,021

80

1,088

34

 Z14-1

462

141

85

0.00005

0.0791

0.0004

0.0541

0.0010

1.995

0.033

0.1829

0.0027

1,083

15

1,114

11

1,175

11

1,065

19

–

–

 Z14-2

445

111

79

0.00002

0.0779

0.0005

0.0584

0.0011

1.912

0.032

0.1780

0.0027

1,056

15

1,085

11

1,144

13

1,147

22

–

–

 Z16-1

29

20

8

0.00870

0.0651

0.0195

0.0391

0.0109

1.480

0.455

0.1650

0.0071

985

39

922

188

777

528

776

213

985

39

 Z17-1

115

87

25

0.00265

0.0708

0.0050

0.0474

0.0031

1.662

0.137

0.1703

0.0060

1,014

33

994

52

951

145

935

60

1,012

33

 Z18-1

1,380

415

205

0.00019

0.0825

0.0006

0.0456

0.0016

1.654

0.058

0.1455

0.0048

876

27

991

22

1,256

14

901

31

–

–

 Z2-1

85

48

17

0.00303

0.0451

0.0084

0.0299

0.0058

1.034

0.200

0.1663

0.0061

992

34

721

100

0

41

595

113

977

34

 Z21-1

191

46

42

0.00097

0.0874

0.0024

0.0737

0.0050

2.461

0.114

0.2042

0.0069

1,198

37

1,261

33

1,369

52

1,438

95

1,243

33

 Z22-1

66

34

18

0.00335

0.0649

0.0080

0.0586

0.0082

1.974

0.261

0.2207

0.0080

1,286

42

1,107

89

770

261

1151

156

1,268

42

 Z23-1

263

300

91

0.00068

0.1000

0.0014

0.0757

0.0027

3.815

0.146

0.2768

0.0094

1,575

47

1,596

31

1,623

26

1,474

51

1,614

24

 Z26-1

45

4

10

0.00803

0.0578

0.0197

–

–

1.235

0.431

0.1551

0.0066

929

37

817

198

521

612

–

320

930

37

 Z28-1

1182

630

271

0.00032

0.0829

0.0006

0.0656

0.0022

2.395

0.083

0.2096

0.0070

1227

37

1,241

25

1,266

13

1,284

43

1,263

12

 Z29-1

111

62

29

0.00120

0.0908

0.0036

0.0706

0.0041

2.762

0.155

0.2205

0.0077

1,285

40

1,345

42

1,443

76

1,378

77

–

–

 Z30-1

157

116

26

0.00059

0.0667

0.0027

0.0405

0.0019

1.362

0.078

0.1481

0.0051

890

29

873

33

830

86

803

38

885

28

 Z31-1

110

68

30

0.00280

0.0900

0.0051

0.0652

0.0047

2.629

0.184

0.2119

0.0075

1,239

40

1,309

52

1,426

108

1,277

89

1,248

39

 Z4-1

150

55

28

0.00120

0.0723

0.0045

0.0509

0.0050

1.682

0.125

0.1688

0.0059

1,005

32

1,002

48

994

126

1,004

97

1,005

32

 Z5-1

120

43

23

0.00164

0.0704

0.0040

0.0490

0.0046

1.645

0.116

0.1694

0.0059

1,009

32

988

44

940

117

966

88

1,005

32

 Z7-1

109

76

22

0.00440

0.0674

0.0088

0.0408

0.0045

1.367

0.191

0.1470

0.0053

884

30

875

82

850

274

809

88

884

30

 Z8-1

147

88

50

0.00219

0.0961

0.0042

0.0666

0.0051

3.743

0.222

0.2824

0.0098

1,603

49

1,581

48

1,551

83

1,302

96

1,590

44

 Z9-1

701

199

155

0.00098

0.0845

0.0013

0.0582

0.0028

2.425

0.093

0.2081

0.0069

1,219

37

1,250

28

1,305

29

1,143

54

1,274

27

  1. The U–Pb ratios were corrected for common lead using 204Pb and Broken Hill lead composition. The significant different errors of individual measurements are the consequence of different analytical conditions during both sessions (see text)
  2. aBold-marked age data were used to construct the probability curves in Figs. 4 and 6. They represent Concordia ages, which were determined according to the method of Ludwig (1998). In those cases, where more than one analysis on a single zircon grain yields discordant ages, the upper intercept age is given (italic font style)
  3. bRegression line was forced through the origin

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Geisler, T., Vinx, R., Martin-Gombojav, N. et al. Ion microprobe (SHRIMP) dating of detrital zircon grains from quartzites of the Eckergneiss Complex, Harz Mountains (Germany): implications for the provenance and the geological history. Int J Earth Sci (Geol Rundsch) 94, 369–384 (2005). https://doi.org/10.1007/s00531-004-0460-1

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  • DOI: https://doi.org/10.1007/s00531-004-0460-1

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