Investigation of the strength contrast at the Moho: A case study from the Oman Ophiolite

Geology

Volumn 38, Issue 8, 2010, Pages 679-682

  Homburg, Janelle M ^a   Hirth, Greg ^b   Kelemen, Peter B ^a  

^a Department of Earth and Environmental Sciences   (United States)

^b BROWN UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

DEFORMATION CONDITIONS; ELECTRON BACK SCATTER DIFFRACTION; FLOW LAW; GABBRONORITES; GEOTHERMOMETRY; GRAIN SIZE; HARZBURGITES; LOWER CRUST; OMAN OPHIOLITE; ORDERS OF MAGNITUDE; VISCOSITY CONTRAST;

DEFORMATION; FELDSPAR; IGNEOUS ROCKS; LITHOLOGY; OLIVINE; RHEOLOGY; SILICATE MINERALS; VISCOMETERS; VISCOSITY;

STRUCTURAL GEOLOGY;

CRUST-MANTLE BOUNDARY; DEFORMATION; DIKE; GABBRO; HARZBURGITE; LITHOLOGY; MOHO; OPHIOLITE; RHEOLOGY; VISCOSITY;

OMAN;

EID: 77955969242     PISSN: 00917613     EISSN: 00917613     Source Type: Journal    
DOI: 10.1130/G30880.1     Document Type: Article

References (32)

1. Andersen, D.J., Lindsley, D.H., and Davidson, P.M., 1993, QUILF: A Pascal program to assess equilibria among Fe-Mg-Mn-Ti oxides, pyroxenes, olivine and quartz: Computers & Geosciences, v. 19, p. 1333-1350, doi: 10.1016/0098-3004(93)90033-2.
2. Behn, M.D., and Kelemen, P.B., 2003, Relationship between seismic P-wave velocity and the composition of anhydrous igneous and meta-igneouscal properties of the lithosphere: Journal of Geophysical Research, v. 88, p. 4183-4214, doi: 10.1029/JB088iB05p04183.
3. Bell, D.R., Rossman, G.R., Maldener, J., Endisch, D., and Rauch, F., 2003, Hydroxide in olivine: A quantitative determination of the absolute amount and calibration of the IR spectrum: Journal of Geophysical Research, v. 108, 2105, doi: 10.1029/2001JB000679.
4. Brace, W.F., and Kohlstedt, D.L., 1980, Limits on lithostatic stress imposed by laboratory experiments: Journal of Geophysical Research, v. 85, p. 6248-6252, doi: 10.1029/JB085iB11p06248.
5. Burov, E.B., and Watts, A.B., 2006, The long-term strength of continental lithosphere: "Jelly sandwich" or "crème brûlée"?: GSA Today, v. 16, no. 1, p. 4-10, doi: 10.1130/1052-5173(2006)016<4:TLTSOC>2.0.CO;2.
6. Chen, W.P., and Molnar, P., 1983, Focal depths of intracontinental and intraplate earthquakes and their implications for the thermal and mechanical properties of the lithosphere: Journal of Geophysical Research, v. 88, p. 4183-4214, doi: 10.1029/JB088iB05p04183.
7. De Bresser, J.H.P., Ter Heege, J.H., and Spiers, C.J., 2001, Grain size reduction by dynamic recrystallization: Can it result in major rheological weakening?: International Journal of Earth Sciences, v. 90, p. 28-45, doi: 10.1007/s005310000149.
8. Dimanov, A., and Dresen, G., 2005, Rheology of synthetic anorthite-diopside aggregates: Implications for ductile shear zones: Journal of Geophysical Research, v. 110, B07203, doi: 10.1029/2004JB003431.
9. Goffe, B., Michard, A., Kienast, J.R., and Le Mer, O., 1988, A case of obduction-related high-pressure, low-temperature mean in upper crustal nappes, Arabian continental margin, Oman: P-T paths and kinematic interpretation: Tectonophysics, v. 151, p. 363-386, doi: 10.1016/0040-1951(88)90253-3.
10. Gómez Barreiro, J., Lonardelli, I., Wenk, H.R., Dresen, G., Rybacki, E., Ren, T., and Tomé, C.N., 2007, Preferred orientation of anorthite deformed experimentally in Newtonian creep: Earth and Planetary Science Letters, v. 264, p. 188-207, doi: 10.1016/j.epsl.2007.09.018.
11. Hacker, B.R., 1994, Rapid emplacement of young oceanic lithosphere: Argon geochronology of the Oman ophiolite: Science, v. 265, p. 1563-1565, doi: 10.1126/science.265.5178.1563.
12. Hirth, G., and Kohlstedt, D.L., 2003, Rheology of the upper mantle and the mantle wedge: A view from the experimentalists, in Eiler, J.M., ed., Inside the subduction factory: American Geophysical Union Geophysical Monograph 138, p. 83-105.
13. Holland, T.J.B., and Blundy, J., 1994, Nonideal interactions in calcic amphiboles and their bearing on amphibole-plagioclase thermometry: Contributions to Mineralogy and Petrology, v. 116, p. 433-447, doi: 10.1007/BF00310910.
14. Holloway, J.R., and Burnham, C.W., 1972, Melting relations of basalt with equilibrium water pressure less than total pressure: Journal of Petrology, v. 13, p. 1-29.
15. Jackson, J., 2002, Strength of the continental lithosphere: Time to abandon the jelly sandwich?: GSA Today, v. 12, no. 9, p. 4-10, doi: 10.1130/1052-5173(2002)012<0004:SOTCLT>2.0.CO;2.
16. Karato, S.-I., 1980, Dynamic recrystallization of olivine single crystals during high-temperature creep: Geophysical Research Letters, v. 7, p. 649-652, doi: 10.1029/GL007i009p00649.
17. Katayama, I., Jung, H., and Karato, S.-I., 2004, New type of olivine fabric from deformation experiments at modest water content and low stress: Geology, v. 32, p. 1045-1048, doi: 10.1130/G20805.1.
18. Lapworth, T., Wheeler, J., and Prior, D.J., 2002, The deformation of plagioclase investigated using of electron backscatter diffraction crystallographic preferred orientation data: Journal of Structural Geology, v. 24, p. 387-399, doi: 10.1016/S0191-8141(01)00057-8.
19. Maggi, A., Jackson, J.A., McKenzie, D., and Priestley, K., 2000, Earthquake focal depths, effective elastic thickness, and the strength of the continental lithosphere: Geology, v. 28, p. 495-498, doi: 10.1130/0091-7613(2000)28<495:EFDEET>2.0.CO;2.
20. Mainprice, D., and Silver, P.G., 1993, Interpretation of SKS-waves using samples from the subcontinental lithosphere: Physics of the Earth and Planetary Interiors, v. 78, p. 257-280, doi: 10.1016/0031-9201(93)90160-B.
21. Marshall, D.B., and McLaren, A.C., 1977, Deformation mechanisms in experimentally deformed plagioclase feldspars: Physics and Chemistry of Minerals, v. 1, p. 351-370, doi: 10.1007/BF00308845.
22. McKenzie, D., and Priestley, K., 2008, The influence of lithospheric thickness variations on continental evolution: Lithos, v. 102, p. 1-11, doi: 10.1016/j.lithos.2007.05.005.
23. Mehl, L., and Hirth, G., 2008, Plagioclase preferred orientation in layered mylonites: Evaluation of flow laws for the lower crust: Journal of Geophysical Research, v. 113, B05202, doi: 10.1029/2007JB005075.
24. Nicolas, A., and Boudier, F., 2008, Large shear zones with no relative displacement: Terra Nova, v. 20, p. 200-205, doi: 10.1111/j.1365-3121.2008.00806.x.
25. Priestley, K., Jackson, J., and McKenzie, D., 2008, Lithospheric structure and deep earthquakes beneath India, the Himalaya and southern Tibet: Geophysical Journal International, v. 172, p. 345-362, doi: 10.1111/j.1365-246X.2007.03636.x.
26. Rybacki, E., and Dresen, G., 2004, Deformation mechanism maps for feldspar rocks: Tectonophysics, v. 382, p. 173-187, doi: 10.1016/j.tecto.2004.01.006.
27. Tilton, G.R., Hopson, C.A., and Wright, J.E., 1981, Uranium-lead isotopic ages of the Samail ophiolite, Oman, with applications to Tethyan ocean ridge tectonics: Journal of Geophysical Research, v. 86, p. 2763-2775, doi: 10.1029/JB086iB04p02763.
28. Twiss, R.T., 1977, Theory and applicability of a recrystallized grain size paleopiezometer: Pure and Applied Geophysics, v. 115, p. 532-537, doi: 10.1007/BF01637105.
29. Van der Wal, D., Chopra, P., Martyn, D., and Gerald, J.F., 1993, Relationships between dynamically recrystallized grain size and deformation conditions in experimentally deformed olivine rocks: Geophysical Research Letters, v. 20, p. 1479-1482, doi: 10.1029/93GL01382.
30. Wenk, H.-R., and Christie, J.M., 1991, Comments on the interpretation of deformation textures in rocks: Journal of Structural Geology, v. 13, p. 1091-1110, doi: 10.1016/0191-8141(91)90071-P.
31. Wong, I.G., and Chapman, D.S., 1990, Deep intraplate earthquakes in the western United States and their relationship to lithospheric temperatures: Seismological Society of America Bulletin, v. 80, p. 589-599.
32. Yuan, X., Ni, J., Kind, R., Mechie, J., and Sandvol, E., 1997, Lithospheric and upper mantle structure of southern Tibet from a seismological passive source experiment: Journal of Geophysical Research, v. 102, p. 27,491-27,500, doi: 10.1029/97JB02379.