Creep mechanisms in the lithospheric mantle inferred from deformation of iron-free forsterite aggregates at 900–1200 °C

Accepted Manuscript Creep mechanisms in the lithospheric mantle inferred from deformation of iron-free forsterite aggregates at 900–1200 °C

Julien Gasc, Sylvie Demouchy, Fabrice Barou, Sanae Koizumi, Patrick Cordier PII: DOI: Reference:

S0040-1951(19)30119-2 https://doi.org/10.1016/j.tecto.2019.04.009 TECTO 128081

To appear in:

Tectonophysics

Received date: Revised date: Accepted date:

1 November 2018 4 April 2019 8 April 2019

Please cite this article as: J. Gasc, S. Demouchy, F. Barou, et al., Creep mechanisms in the lithospheric mantle inferred from deformation of iron-free forsterite aggregates at 900–1200 °C, Tectonophysics, https://doi.org/10.1016/j.tecto.2019.04.009

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Experi mental Conditi ons and Results

Starting Material

Static Annealing

Deformation Experiments

Sample Name

SM

NF1000-0

NF900-1

NF9 501

NF1000-1

NF1 0002

NF1050-1

Temperatur e (°C)

NA

1,0 00

900

950

1,0 00

1,00 0

1,0 50

Sleeve Type

NA

Ag

Ag

Ag

Cu

Cu

Initial Length (mm)

NA

NA

7.2 5

10. 20

10. 35

Strain (%)

NA

NA

3.9

3.1

Duration (s)

NA

14, 400

9,3 08

D E

Max Strength (MPa)

NA

NA

Yield Stress (MPa)

NA

Apparent E at Yield (GPa)

NA

NF1 2001

1,1 10

1,1 10

1,20 0

Cu

Ni

Ni

Ni

10. 55

10. 42

9.4 8

10.3 5

I R

T P

2.8

A M

3.6

10. 4

12. 4

5.0

10.0

6,5 02

5,1 54

8,19 8

12, 668

14, 024

6,9 17

11,0 22

1,8 70

1,5 10

1,1 70

1,34 0

1,1 40

840

870

480

NA

557

586

662

706

603

434

600

152

NA

112 .2

93. 5

83. 2

69.6

63. 9

20. 2

48. 6

32.1

T P E

C C

A

U N 9.60

NF1110-2

SC

NF1110-1

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# Grains

1,5 66

1,0 35

1,1 51

1,0 77

4,6 25

5,9 70

1,5 44

14, 009

4,5 01

4,1 85

5,97 0

1,5 64

11, 984

823

4,8 76

4,6 28

6,4 31

6,0 54

13,3 50

951

J index

1.1 637

1.2 680

1.2 526

1.2 472

1.0 618

1.0 509

1.1 838

1.0 236

1.0 782

1.0 871

1.04 81

1.1 568

1.0 532

1.3 567

1.0 657

1.0 82

1.0 449

1.0 432

1.02 35

1.3 568

J index 1PPG

1.0 877

1.1 285

1.1 105

1.1 335

1.0 314

1.0 259

1.0 949

1.0 154

1.0 335

1.0 364

1.02 62

1.0 857

1.0 394

1.2 434

1.0 453

1.0 263

1.0 246

1.01 18

1.1 569

Average Grain Size (µm)

3.1 15

3.2 85

3.0 85

2.6 60

3.2 50

Mean Aspect Ratio

1.9 25

1.9 30

1.8 45

2.0 55

1.9 20

Mean Shape Factor

1.3 90

1.3 85

1.3 90

1.4 30

Mean GOS (°)

0.2 10

0.2 00

0.2 45

0.3 40

T P E

D E

I R

2.78 0

2.9 25

1.91 0

M

1.4 25 0.3 75

C C

A

43

3.1 20

2.7 25

2.86 0

2.0 85

2.1 25

1.9 40

2.16 5

1.40 0

1.5 00

1.4 40

1.3 95

1.48 5

0.26 0

1.3 10

1.3 75

0.5 65

0.70 5

C S U

N A

T P 1.0 407

NU

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