Exhumation of ultrahigh-pressure rocks beneath the Hornelen segment of the Nordfjord-Sogn Detachment Zone, western Norway

Bulletin of the Geological Society of America

Volumn 119, Issue 9-10, 2007, Pages 1232-1248

  Johnston, Scott ^a   Hacker, Bradley R ^a   Ducea, Mihai N ^b  

^a UNIVERSITY OF CALIFORNIA   (United States)

^b The University of Arizona   (United States)

Author keywords

Exhumation; Hornelen Region; Low angle detachment; Nordfjord Sogn Detachment Zone; Ultrahigh pressure rocks; Western Norway

Indexed keywords

CARBONIFEROUS-DEVONIAN BASINS; DUCTILE-BRITTLE DETACHMENT; QUARTZ PETROFABRICS; THERMOBAROMETRY; ULTRAHIGH-PRESSURE ROCKS;

DEFORMATION; GARNETS; GEOCHRONOLOGY; QUARTZ; STRAIN RATE; STRUCTURAL GEOLOGY; TECTONICS;

PETROLOGY;

DEFORMATION; DETACHMENT FAULT; EXHUMATION; GEOCHRONOLOGY; METAMORPHIC ROCK; SHEAR ZONE;

EURASIA; EUROPE; HORNELEN BASIN; NORDFJORD; NORTHERN EUROPE; NORWAY; SCANDINAVIA; SOGN OG FJORDANE;

EID: 34648816677     PISSN: 00167606     EISSN: 00167606     Source Type: Journal    
DOI: 10.1130/B26172.1     Document Type: Article

References (90)

1. Andersen, T.B, 1998, Extensional tectonics in the Caledonides of southern Norway, an overview: Tectonophysics, v. 285, p. 333-351, doi: 10.1016/S0040-1951(97)00277-1.
2. 39Ar phengite cooling ages from the Caledonides of western Norway: Journal of the Geological Society of London, v. 155, p. 297-309.
3. Andersen, T.B., and Jamtveit, B., 1990, Uplift of deep crust during orogenic extensional collapse: A model based on field studies in the Sogn-Sunnfjord region of western Norway: Tectonics, v. 9, p. 1097-1111.
4. Andersen, T.B., Osmundsen, P.T., and Jolivet, L., 1994, Deep crustal fahdcs and a model for the extensional collapse of the southwest Norwegian Caledonides: Journal of Structural Geology, v. 16, p. 1191-1203, doi: 10.1016/0191-8141(94)90063-9.
5. Andersen, T.B., Skjerlie, K.P., and Furnes, H., 1990, The Sunnfjord Melange, evidence of Silurian ophiolite accretion in the West Norwegian Caledonides: Journal of the Geological Society of London, v. 147, p. 59-68.
6. Baldwin, S.L., Monteleone, B.D., Webb, L.E., Fitzgerald, P.G., Grove, M., and Hill, E.J., 2004, Pliocene eclogite exhumation at plate tectonic rotes in eastern Papua New Guinea: Nature, v. 431, p. 263-267, doi: 10.1038/nature02846.
7. Beaumont, C., Jamieson, R.A., Nguyen, M.H., and Lee, B., 2001, Himalayan tectonics explained by extrusion of a low-viscosity crustal channel coupled to focused surface denudation: Nature, v. 414, p. 738-742, doi: 10.1038/414738a, doi: 10.1038/414738a.
8. Bingen, B., Austrheim, H., Whitehouse, M.J., and Davis, W.J., 2004, Trace element signature and U-Pb geochronology of eclogite-facies zircon, Bergen Arcs, Caledonides of W Norway: Contributions to Mineralogy and Petrology, v. 147, p. 671-683.
9. Braathen, A., 1999, Kinematics of post-Caledonian polyphase brittle faulting in the Sunnfjord region, western Norway: Tectonophysics, v. 302, p. 99-121, doi: 10.1016/S0040-1951(98)00281-9.
10. Braathen, A., Osmandsen, P.T, and Gabrielsen, R.H., 2004, Dynamic development of fault rocks in a crustal-scale detachment; an example from western Norway: Tectonics, v. 23, no. 4, p. TC4010, doi: 10.1029/ 2003TC001558, doi: 10.1029/2003TC001558.
11. Bryhni, I., 2000, Berggrunnskart NORDFJORDEID 1218 I, M 1:50,000: Foreløgip utgave Norges geologiske undersøkelse.
12. Bryhni, I., and Grimstad, E., 1970, Supracrustal and infracrustal rocks in the gneiss region of the Caledonides west of Breimsvatn: Norges Geologiske Undersökelse, v. 266, p. 105-140.
13. Bryhni, I., and Lutro, O., 2000a, Berggmunskart EIKEFJORD 1118 H, M 1:50,000: Foreløgip utgave Norges geologiske undersøkelse.
14. Bryhni, I., and Lutro, O., 2000b, Berggrunnskart FIMLANDSGREND 1218 II, M 1:50,000: Foreløgip utgave Norges geologiske undersøkelse.
15. Bryhni, I., and Lutro, O., 2000c, Berggrunnskart NAUSTDAL 1218 III, M 1:50,000: Foreløgip utgave Norges geologiske undersøkelse.
16. Bryhni, I., and Lyse, K., 1985, The Kalvåg Mélange., Norwegian Caledonides, in Gee, D.G., and Sturt, B.A., eds., The Caledonide Orogen - Scandinavia and Related Areas: John Wiley and Sons [Chichester], p. 417-427.
17. Carswell, D.A., Brueckner, H.K., Cuthbert, S.J., Mehta, K., and O'Brien, P.J., 2003, The timing of stabilisation and the exhumation rate for ultra-high pressure rocks in the Western Gneiss Region of Norway: Journal of Metamorphic Geology, v. 21, p. 601-612, doi: 10.1046/ j.1525-1314.2003.00467.x.
18. Carswell, D.A., and Cuthbert, S.J., 2003, Ultra-high pressure metamorphism in the Western Gneiss Region of Norway: EMU Notes in Mineralogy, v. 5, p. 51-73.
19. Chauvet, A., and Séranne., M., 1994, Extension-parallel folding in the Scandinavian Caledonides: Implications for late-orogenic processes: Tectonophysics, v. 238, p. 31-54, doi: 10.1016/0040-1951(94)90048-5.
20. Chemenda, A.I., Burg, J.-P., and Mattauer, M., 2000, Evolutionary model of the Himalaya-Tibet system: Geopoem based on new modelling, geological and geophysical data: Earth and Planetary Science Letters, v. 174, p. 397-409, doi: 10.1016/S0012-821X(99)00277-0.
21. Corfu, F., and Andersen, T.B., 2002, U-Pb ages of the Dalsfjord Complex, SW Norway, and their beating on the correlation of allochthonous crystalline segments of the Scandinavian Caledonides: International Journal of Earth Sciences, v. 91, no. 6, p. 955-963, doi: 10.1007/ s00531-002-0298-3.
22. Cuthbert, S.J., 1991, Evolution of the Devonian Hornelen Basin, west Norway: New constraints from petrological studies of metamorphic clasts, in Morton, A.C., Todd, S.P., and Haughton, P.D.W., eds., Developments in Sedimentary Provenance Studies: Geological Special Publications, Geological Society, London, Special Publications, p. 343-360.
23. Cuthbert, S.J., Carswell, D.A., Krogh-Ravna, E.J., and Wain, A., 2000, Eclogites and eclogites in the Western Gneiss Region: Norwegian Caledonides: Lithos, v. 52, p. 165-195, doi: 10.1016/ S0024-4937(99)00090-0.
24. Cuthbert, S.J., Harvey, M.A., and Carswell, D.A., 1983, A tectonic model for the metamorphic evolution of the Basal Gneiss Complex, Western South Norway: Journal of Metamorphic Geology, v. 1, p. 63-90, doi: 10.1111/ j.1525-1314.1983.tb00265.x.
25. Dewey, J.F., Ryan, P.D., and Andersen, T.B., 1993, Orogenic uplift and collapse, crustal thickness, fabrics and metamorphic phase changes: The role of eclogites, in Prichard, H.M., Alabaster, T., Harris, N.B.W., and Neary, C.R., eds., Magmalic Processes and Plate Tectonics: Geological Society, London, Special Publications, v.76, p. 325-343.
26. Dodson, M.H., 1973, Closure temperature in cooling geochronological and petrological systems: Contributions to Mineralogy and Petrology, v. 40, p. 259-274, doi: 10.1007/BF00373790.
27. Ducea, M, Ganguly, L, Rosenberg, E.J., Patchett, P.J., Cheng, W., and Isachsen, C., 2003, Sm-Nd dating of spatially controlled domains of garnet single crystals: A new method of high-temperature chronology: Earth and Planetary Science Letters, v, 213, p. 31-42, doi: 10.1016/ S0012-821X(03)00298-X.
28. 39Ar provenance analysis in west-central Norway: Norwegian Journal of Geology, v. 85, p. 133-149.
29. Eide, E.A., Torsvik, T.H., and Andersen, T.B., 1997, Absolute dating of brittle fault movements: Late Permian and late Jurassic extensional fault breccias in western Norway: Term Nova, v. 9, p. 135-139.
30. Engvik, A.K., and Andersen, T.B., 2000, Evolution of Caledonian deformation fabrics under eclogite and amphibolite facies at Vårdalsneset, Western Gneiss Region, Norway: Journal of Metamorphic Geology, v. 18, p. 241-257, doi: 10.1046/j.1525-1314.2000.00252.x.
31. Ferry, J.M., and Spear, ES., 1978, Experimental calibration of the partitioning of Fe and Mg between biotite and garnet: Contributions to Mineralogy and Petrology, v. 66, p. 113-117, doi: 10.1007/BF00372150.
32. Foreman, R., Andersen, T.B., and Wheeler, J., 2005, Eclogite-facies polyphase deformation of the Drøsdal eclogite, Western Gneiss Complex, Norway, and implications for exhumation: Tectonophysics, v. 398, no. 1-2, p. 1-32, doi: 10.1016/j.tecto.2004.10.003.
33. 39Ar thermochronology: Journal of Structural Geology, v. 20, p. 765-781, doi: 10.1016/S0191-8141(98)00007-8.
34. Gee, D.G., Guezou, J.C., Roberts, D., and Wolff, F.C., 1985, The central-southern part of the Scandinavian Caledonides, in Gee, D.G., and Sturt, B.A., eds., The Caledonide Orogen-Scandinavia and Related Areas: John Wiley and Sons [Chichester], p. 109-133.
35. Ghent, E.D., and Stout, M.Z., 1981, Geobarometry and geothermometry of plagioclase-biotite-garnet-muscovite assemblages: Contributions to Mineralogy and Petrology, v. 76, p. 92-97, doi: 10.1007/BF00373688.
36. Glodny, J., Ring, U., Kühnm, A., Gleissner, P., and Franz, G., 2005, Crystallization and very rapid exhumation of the youngest Alpine eclogites (Tanem Window, Eastern Alps) from Rb/Sr mineral assemblage analysis: Contributions to Mineralogy and Petrology, v. 149, p. 699-715, doi: 10.1007/s00410-005-0676-5.
37. Graham, C.M., and Powell, R., 1984, A garnet-hornblende geothermometer: Calibration, testing, and application to the Pelona Schist, Southern California: Journal of Metamorphic Geology, v. 2, p. 13-31, doi: 10.1111/ j. 1525-1314.1984.th00282.x.
38. 2O in subducting slabs: International Geology Review, v. 48, p. 1053-1066.
39. Hacker, B.R., Andersen, T.B., Root, D.B., Mehl, L., Mattinson, J.M., and Wooden, J.L., 2003, Exhumation of high-pressure rocks beneath the Solund Basin, Western Gneiss Region of Norway: Journal of Metamorphic Geology, v. 21, p. 613-629, doi: 10.1046/j.1525-1314.2003.00468.x.
40. Hacker, B.R., and Gans, P.B., 2005, Continental collisions and the creation of ultrahigh-pressure terranes: Petrology and thermochronology of nappes in the central Scandinavian Caledonides: Geological Society of America Bulletin, v. 117, no. 1-2, p. 117-134, doi: 10.1130/B25549.1.
41. Hacker, B.R., Yin, A., Christie, J.M., and Davis, G.A., 1992, Stress magnitude, strain rate, and rheology of extended middle crust inferred from quartz grain sizes in the Whipple Mountains, California: Tectonics, v. 11, p. 36-46.
42. Hacker, B.R., Yin, A., Christie, J.M., and Snoke, A.W., 1990, Differential stress, strain rate, and temperatures of mylonitization in the Ruby Mountains: Implications for the rate and duration of exhumation: Journal of Geophysical Research, v. 95, p. 8569-8580.
43. Hirth, G., Teyssier, C., and Dunlap, W.J., 2001, An evaluation of quartzite flow laws based on comparisons between experimentally and naturally deformed rocks: International Journal of Earth Sciences, v. 90, no. 1, p. 77-87, doi: 10.1007/s005310000152.
44. Hirth, G., and Tullis, J., 1992, Dislocation creep regimes in quartz aggregates: Journal of Structural Geology, v. 14, no. 2, p. 145-159, doi: 10.1016/0191-8141(92)90053-Y.
45. Hossack, J.R., 1984, The geometry of listric growth faults in the Devonian Basins of Sunnfjord, W. Norway: Journal of the Geological Society of London, v. 141, p. 629-637.
46. Johnston, S., Hacker, B.R., and Andersen, T.B., 2007, Exhuming Norwegian ultrahigh-pressure rocks: Overprinting extensional structures and the role of the Nordfjord-Sogn Detachment Zone: Tectonics (in press).
47. Johnston, S.M., 2006, Exhumation of Norwegian Ultrahigh-Pressure Rocks [Ph.D. thesis]: University of California, Santa Barbara, 132 p.
48. 39Ar muscovite thermochronology reveals excess Argon and 405-399 Ma age for the Nordfjord-Sogn Detachment Zone, Hornelen region, Norway: Eos (Transactions, American Geophysical Union), v. 87, p. T41E-08.
49. Johnston, S.M., Hacker, B.R., and Gehrels, G., 2003, Exhumation of Norwegian ultrahigh-pressure rocks: Zircon Geochronology and Tectonostratigraphy of the Hornelen Region: Eos (Transactions, American Geophysical Union), v. 84, no. 46, p. T32F-06.
50. Kohn, M.J., and Spear, F., 2000, Retrograde net transfer reaction insurance for pressure-temperature estimates: Geology, v. 28, p. 1127-1130, doi: 10.1130/0091-7613 (2000)28<1127:RNTRIF>2.0.CO;2.
51. Kohn, M.J., and Spear, F.S., 1990, Two new geobarometers for garnet amphibolites, with applications to southeastern Vermont: American Mineralogist, v. 75, p. 89-96.
52. Konopasek, J., 1998, Formation and destabilization of the high pressure assemblage garnet-phengite-paragonite (Krusne Hory Mountains, Bohemian Massif): The significance of the Tschermak substitution in the metamorphism of pelitic rocks: Lithos, v. 42, no. 34, p. 269-284, doi: 10.1016/S0024-4937(97)00046-7.
53. Krabbendam, M., and Dewey, J.F., 1998, Exhumation of UHP rocks by transtension in the Western Gneiss Region, Scandinavian Caledonides, in Holdsworth, R.E., Strachan, R.A., and Dewey, J.F., eds., Continental Transpressional and Transtensional Tectonics: Geological Society, London, Special Publications, p. 159-181.
54. Krogh, E.J., 1977, Evidence of Precambrian continent-continent collision in Western Norway: Nature, v. 267, p. 17-19, doi: 10.1038/267017a0.
55. Krogh, E.J., and Carswell, D.A., 1995, HP and UHP eclogites and garnet peridotites in the Scandinavian Caledonides, in Coleman, R.G., and Wang, X., eds., Ultrahigh Pressure Metamorphism: Cambridge University Press [Stanford], p. 244-298.
56. Kylander-Clark, A., Hacker, B.R., Johnson, C.M., Beard, B.L., Mahlen, N.J., and Lapen, T.J., 2007, Coupled Lu-Hf and Sm-Nd geochronology constrains prograde and exhumation histories of high- and ultrahigh-pressure eclogites from western Norway: Chemical Geology (in press).
57. Labrousse, L., Jolivet, L., Andersen, T.B., Agard, P., Maluski, H., and Schärer, U., 2004, Pressure-temperature-time-deformation history of the exhumation of ultra-high pressure rocks in the Western Gneiss region, Norway: Geological Society of America Special Paper, v. 380, p. 155-185.
58. Lutro, O., and Bryhni, I., 2000, Bevggrunnskart FLORØ 1118 III, M 1:50,000: Foreløgip utgave Norges geologiske undersøkelse.
59. Milnes, A.G., Wennberg, O.P., Skår, Ø., and Koestler, A.G., 1997, Contraction, extension, and timing in the South Norwegian Caledonides: The Sognefjord transect, in Burg, J.-P., and Ford, M., eds., Orogeny through Time: Geological Society, London, Special Publications, p. 123-148.
60. Norton, M.G., 1987, The Nordfjord-Sogn detachment, W. Norway: Norsk Geologisk Tidsskrift, v. 67, p. 93-106.
61. Osmundsen, P.T., Andersen, T.B., Markussen, S., and Svendby, A.K., 1998, Tectonics and sedimentation in the hanging wall of a major extensional detachment: The Devonian Kvamshesten Basin, western Norway: Basin Research, v. 10, p. 213-234.
62. Parrish, R.R., Gough, S.J., Searle, M., and Waters, D., 2006, Plate velocity exhumation of ultrahigh-pressure eclogites in the Pakistan Himalaya: Geology, v. 34, no. 11, p. 989-992, doi: 10.1130/G22796A.1, doi: 10.1130/G22796A.1.
63. Powell, R., and Holland, T.J.B., 1988, An internally consistent dataset with uncertainties and correlations: 3. Applications to geobarometry, worked examples and a computer program: Journal of Metamorphic Geology, v. 6, p. 173-204, doi: 10.1111/j.1525-1314.1988.tb00415.x.
64. Ratschbacher, L., Hacker, B.R., Calvert, A., Webb, L.E., Grimmer, J.C., McWilliams, M., Ireland, T.R., Dong, S., and Hu, J., 2003, Tectonics of the Qinling (central China): Tectonostratigraphy, geochronology, and deformation history: Tectonophysics, v. 366, p. 1-53, doi: 10.1016/ S0040-1951(03)00053-2.
65. Ratschbacher, L., Sperner, B., Meschede, M., and Frisch, W., 1994, Computer techniques and applications: A program library for quantitative structural analysis: Tübinger Geowissenschaftliche Arbeiten, v. 21, p. 1-73.
66. Ravna, E.J.K., and Terry, M.P., 2004, Geothermobarometry of UHP and HP eclogites and schists: An evaluation of equilibria among garnet-clinopyroxene-loyanite-phengite-coesite/quartz: Journal of Metamorphic Geology, v. 22, no. 6, p. 579-592.
67. Roberts, D., and Gee, D.G., 1985, An introduction to the structure of the Scandinavian Caledonides, in Gee, D.G., and Sturt, B.A., eds., The Caledonide Orogen-Scandinavia and Related Areas: John Wiley and Sons [Chichester], p. 55-68.
68. Roberts, D., and Sturt, B.A., 1980, Caledonian deformation in Norway: Journal of the Geological Society of London, v. 137, no. 3, p. 241-250.
69. Robinson, P., 1995, Extension of Trollheimen tectono-stratigraphic sequence in deep synclines near Molde and Brattvåg, Western Gneiss Region, southern Norway: Norsk Geologisk Tidsskrift, v. 75, p. 181-198.
70. Root, D.B., Hacker, B.R., Gans, P., Eide, E., Ducea, M., and Mosenfelder, J., 2005, Discrete ultrahigh-pressure domains in the Western Gneiss Region, Norway: Implications for formation and exhumation: Journal of Metamorphic Geology, v. 23, p. 45-61, doi: 10.1111/j.1525-1314.2005.00561.x.
71. Root, D.B., Hacker, B.R., Mattinson, J.M., and Wooden, J.L., 2004, Young age and rapid exhumation of Norwegian ultrahigh-pressure rocks: An ion microprobe and chemical abrasion stody: Earth and Planetary Science Letters, v. 228, p. 325-341, doi: 10.1016/j.epsl.2004.10.019.
72. Schåer, U., 1980, U-Pb and Rb-Sr dating of a polymetamorphic nappe terrain: the Caledonian Jotun Nappe, southern Norway: Earth and Planetary Science Letters, v. 49, p. 205-218, doi: 10.1016/ 0012-821X(80)90065-5.
73. Schmid, S.M., and Casey, M., 1986, Complete fabric analysis of some commonly observed quartz c-axis patterns: Geophysical Monograph, v. 36, p. 263-286.
74. Sérann, M., and Séguret, M., 1987, The Devonian basins of western Norway: Tectonics and kinematics of extending crust: Geological Society of London Special Publication, v. 28, p. 537-548.
75. Smith, D.C., 1984, Coesite in clinopyroxene in the Caledonides and its implications for geodynamics: Nature, v. 310, p. 641-644, doi: 10.1038/ 310641a0.
76. Steel, R.J., Siedlicka, A., and Roberts, D., 1985, The Old Red Sandstone basins of Norway and their deformation: a review, in Gee, D. G., and Sturt, B. A., eds., The Caledonide Orogen-Scandinavia and Related Areas: John Wiley and Sons [Chichester], p. 293-316.
77. Stipp, M., Smenitz, H., Heilbronner, R., and Schmid, S.M., 2002a, Dynamic recrystallization of quartz; correlation between natural and experimental conditions: Geological Society, London, Special Publications, v. 200, p. 171-190.
78. Stipp, M., Stuenitz, H., Heilbronner, R., and Schmid, S.M., 2002b, The eastern Tonale fault zone; a "natural laboratory" for crystal plastic deformation of quartz over a temperature range from 250 to 700 degrees C: Journal of Structural Geology, v. 24, no. 12, p. 1861-1884, doi: 10.1016/S0191-8141(02)00035-4.
79. Stipska, P., and Powell, R., 2005, Constraining the P-T path of a MORB-type eclogite using pseudosections, garnet zoning and garnet-clinopyroxene thermometry; an example from the Bohemian Massif: Journal of Metamorphic Geology, v. 23, no. 8, p. 725-743, doi: 10.1111/ j.1525-1314.2005.00607.x.
80. Terry, M.P., Robinson, P., Hamilton, M.A., and Jercinovic, M.J., 2000, Monazite geochronology of UHP and HP metamorphism, deformation, and exhumation, Nordøyane, Western Gneiss Region, Norway: American Mineralogist, v. 85, p. 1651-1664.
81. Torsvik, T.H., Sturt, B.A., Swensson, E., Andersen, T.B., and Dewey, J.F., 1992, Palaeomagnetic dating of fault rocks: Evidence for Permian and Mesozoic movements along the Dalsfjord Fault, Western Norway: Geophysical Journal Internatioanl, v. 109, p. 565-580, doi: 10.1111/ j.1365-246X.1992.tb00118.x.
82. Twiss, R.J., 1977, Theory and applicability of a recrystallized grain size paleopiezometer: Pure and Applied Geophysics, v. 115, p. 227-244, doi: 10.1007/BF01637105.
83. Twiss, R.J., 1980, Static theory of size variation with stress for subgrains and dynamically recrystallized grains: U.S. Geological Survey Open-File Report, no. 80-625, p. 665-683.
84. Van Orman, J.A., Grove, TL., Shimizu, N., and Layne, G., 2002, Rare earth element diffusion in a natural pyrope single crystal at 2.8 GPa: Contributions to Mineralogy and Petrology, v. 142, p. 416-424.
85. Wain, A., 1997, New evidence for coesite in eclogite and gneisses; defining an ultrahigh-pressure province in the Western Gneiss region of Norway: Geology, v. 25, p. 927-930, doi: 10.1130/ 0091-7613(1997)025<0927: NEFCIE>2.3.CO;2.
86. Walsh, E.O., and Hacker, B.R., 2004, The fate of subducted continental margins: Two-stage exhumation of the high-pressure to ultrahigh-pressure Western Gneiss complex, Norway: Journal of Metamorphic Geology, v. 22, p. 671-689, doi: 10.1111/j.1525-1314.2004.00541.x.
87. Walsh, E.O., Hacker, B.R., Gans, P., Grove, M., and Gehrels, G., 2007, Protolith ages and exhumation histories of (ultra)high-pressure rocks across the Western Gneiss Region, Norway: Geological Society of America Bulletin, v. 119, no. 3/4, p. 289-301, doi: 10.1130/B25817.1, doi: 10.1130/B25817.1.
88. Wilks, S.J., and Cuthbert, S.J., 1994, The evolution of the Hornelen Basin detachment system, western Norway: Implications for the style of late orogenic extension in the southern Scandinavian Caledonides: Tectonophysics, v. 238, p. 1-30, doi: 10.1016/0040-1951(94)90047-7.
89. Young, D., 2005, Amphibolite to Ultrahigh-Pressure Transition in Western Norway [Ph.D. thesis]: University of California, Santa Barbara. 120 p.
90. Young, D.J., Hacker, B.R., Andersen, T.B., and Corfu, F., 2007, Prograde amphibolite facies to ultrahigh-pressure transition along Nordfjord: Implications for exhumation tectonics: Tectonics, v. 26, p. TC1007, doi: 10.1029/2004TC001781, doi: 10.1029/2004TC001781.