Prof. Dr. Patrick O'Brien

My main research area is the deciphering of processes occurring during continental collision and associated mountain building. High mountains such as the Himalayas, Rockies or Andes are an impressive active demonstration of the power of the processes acting during collision of the lithospheric plates on Earth's surface. Geophysical evidence indicates thicknesses of crustal rocks of well above 60 km in these regions - crustal thicknesses much greater than the normally expected 30-40 km found in continental interiors. An increasing number of metamorphic complexes reveal mineralogical evidence, such as the presence of coesite, diamond or exsolved pyroxene in garnet (former majorite) of even greater burial depths implying deep subduction of continental crust. Rocks in the deep root zones of present-day mountain belts or in subduction zones will be undergoing mineralogical and textural changes - metamorphism - due to changes in the temperature and pressure of their surroundings. However, these rocks are too deeply buried for us to extract them by deep drilling - the deepest boreholes at present reach depths of only 9-14 km (KTB, Windischeschenbach, Germany, and Kola Peninsula, Russia) - and so our only guides to the processes acting in the deep crust of mountain belts are the results of theoretical models or, more importantly, the 'eye-witnesses' themselves, i.e. metamorphic rocks exposed by processes of extension and/or erosion in ancient and modern collision belts. Such rocks contain an encoded record of the magnitude and duration of material and energy transport resulting from plate collision. The task of the petrologist is to identify and extract such evidence from the most reliable 'eye-witnesses' and thus reconstruct rates of burial/exhumation, heating/cooling and mineral growth/breakdown as well as determine the extremes of pressure and temperature experienced by the rocks. This key information about rates and extremes from Mother Nature's experiments provides the critical boundary conditions without which theoretical modelling would only be of limited use.

Submitted or in press

ISI-listed peer review publications

*** >100 cites; ** >50 cites; * >25 cites (Google scholar citations, Thompson ISI all databases)

O'Brien, P.J. (2019): Tso Morari coesite eclogite: pseudosection predictions v. the preserved record and implications for tectonometamorphic models. In: Zhang LF, Zhang Z, Schertl H-P & Wei CJ (eds) HP-UHP metamorphism and tectonic evolution of orogenic belts. Geological Society, London, Special Issue, 474, doi.org/10.1144/SP474.16

O'Brien, P.J. (2019): Eclogites and other high-pressure rocks in the Himalaya: a review. In: Treloar PJ & Searle MP (eds) Himalayan Tectonics: A Modern Synthesis. Geological Society, London, Special Publication, 483, doi.org/10.1144/SP483.13

Ferrero, S., O'Brien, P.J., Borghini, A., Wunder, B., Wälle, M., Günter, C. & Ziemann, M.A. (2018): A treasure chest of nanogranitoids: an archive to investigate crustal melting in the Bohemian Massif. In: Ferrero S, Lanari P, Goncalves P & Grosch EG (eds), Metamorpphic Geology: Microscale to Mountain Belts. Geological Society, London, Special Publications, 478. doi.org/10.1144/SP478.19

Borghini A, Ferrero S, Wunder B, Laurent O, O'Brien PJ, Ziemann MA (2018) Granitoid melt inclusions in orogenic peridotite and the origin of garnet clinopyroxenite. Geology, doi.org/10.1130/G45316.1

Ferrero S, Wunder B, Ziemann MA, Wälle M, O'Brien PJ (2016) Carbonatitic and granitic melts produced under conditions of primary immiscibility during anatexis in the lower crust. Earth and Planetary Science Letters,  454, 121-131

Rehman H, Lee HY, Chung SL, Khan T, O'Brien PJ, Yamamoto H (2016) Source and mode of the Permian Panjal Trap magmatism: evidence from zircon U-Pb and Hf isotopes and trace element data from the Himalayan ultrahigh-pressure rocks. Lithos doi:10.1016/j.lithos.2016.06.001

Ferrero S, Ziemann MA, Angel RJ, O'Brien PJ, Wunder B (2016) Kumdykolite, kokchetavite, and cristobalite crystallized in nanogranites from felsic granulites, Orlica-Snieznik Dome (Bohemian Massif): not an evidence for ultrahigh-pressure conditions. Contributions  to Mineralogy and Petrology, 171, 

Wilke FDH, O'Brien PJ, Schmidt A, Ziemann MA (2015) Subduction, peak and multistage exhumation metamorphism: traces from one coesite-bearing eclogite, Tso Morari, western Himalaya. Lithos, 231, 77-91

* Ferrero, S., Wunder, B., Walczak, K., O'Brien, P.J., Ziemann, M.A. (2015): Preserved near-UHP melt from continental crust subducted to mantle depths. Geology, 43, 447-450 

Rehman, H.U., Tanaka, R., O'Brien, P.J., Kobayashi, K., Tsujimori, T., Nakamura, E., Yamamoto, H., Khan, T., Kaneko, Y. (2014): Oxygen isotopes in Indian Plate eclogites (Kaghan Valley, Pakistan): Negative delta O-18 values from a high latitude protolith reset by Himalayan metamorphism. Lithos, 208, 471-483

* Schertl, H-P., O'Brien, P.J. (2013). UHP-metamorphism: Minerals and microstructures. Elements, 9, 261-266

Scott, J.M., Konrad-Schmolke, M., O'Brien, P.J., Günter, C (2013). High-T, Low-P formation of rare olivine-bearing symplectites in Variscan eclogite. Journal of Petrology, 54, 1375-1398.

Wilke, F.D.H., Sobel, E.R., O’Brien, P.J., Stockli, D. (2012): Apatite fission track and (U-Th)/He ages from the Higher Himalayan Crystallines, Kaghan Valley, Pakistan: implications for an Eocene Plateau and Oligocene to Pliocene exhumation. Journal of Asian Earth Sciences, 59,14-23

Konrad-Schmolke, M., Zack, T., O'Brien, P.J., Barth, M. (2011): Fluid migration above a subducted slab -Thermodynamic and trace element modelling of fluid-rock interaction in partially overprinted eclogite facies rocks (Sesia Zone, Western Alps). Earth and Planetary Science Letters, 311, 287-298

** Schmidt, A., Mezger, K., O'Brien, P.J. (2011): The timing of eclogite formation in the ultrahigh-pressure rocks of the Sulu terrane: constraints from Lu-Hf garnet geochronology. Lithos,125, 743-756 doi: 10.1016/j.lithos.2011.04.004

*** Kotkova, J., O’Brien, P.J., Ziemann, M.A. (2011): Diamond and coesite discovered in Saxony-type granulite: solution to the Variscan garnet peridotite enigma. Geology, 39, 667-670 doi:10.1130/G31971.1

** Konrad-Schmolke, M., O’Brien, P.J., Zack, T. (2011): Fluid migration above a subducted slab – constraints on amount, pathways and major element mobility from partially overprinted eclogite-facies rocks (Sesia Zone, Western Alps). Journal of Petrology, 52, 457-486. doi:10.1093/petrology/egq087 

** Wilke, F.D.H., O’Brien, P.J., Gerdes, A., Timmerman, M.J., Sudo, M., Khan M.A. (2010): The multistage exhumation history of the Kaghan Valley UHP series, NW Himalaya, Pakistan from U-Pb and 40Ar/39Ar ages. European Journal of Mineralogy, 22, 703-719.

* Wilke, F.D.H., O’Brien, P.J., Altenberger, U., Konrad-Schmolke, M., Khan M.A. (2010): Multi-stage reaction history in different eclogite types from the Pakistan Himalaya and implications for exhumation processes. Lithos, 114, 70-85.

* O’Brien, P.J. & Ziemann, M.A. (2008): Preservation of coesite in exhumed eclogite: insights from Raman mapping. European Journal of Mineralogy, 20, 827-834

** Konrad-Schmolke, M., Zack, T., O’Brien, P.J. & Jacob, D. (2008); Combined thermodynamic and trace element modelling of garnet growth during subduction: examples from ultrahigh-pressure eclogites of the Western Gneiss Region, Norway. Earth and Planetary Science Letters, 272, 488-498.

** Konrad-Schmolke, M., O’Brien, P.J., De Capitani, C. & Carswell, D.A. (2008): Garnet growth at high- and ultra-high pressure conditions and the effect of element fractionation on mineral modes and compositions. Lithos, 103, 309-332.

** O’Brien, P.J. (2008): Challenges in high-pressure granulite metamorphism: reaction textures, compositional zoning, ages and tectonic interpretation with examples from the Bohemian Massif. Journal of Metamorphic Geology, 26, 235-251.

* Konrad-Schmolke, M., O’Brien, P.J. & Heidelbach, F. (2007): Compositional re-equilibration of garnet: the importance of sub-grain boundaries. European Journal of Mineralogy, 19, 431-438

** De Andrade, V., Vidal, O., Lewin, E., O’Brien, P.J. & Agard, P. (2006): Quantification of electron microprobe compositional maps of rock thin sections: an optimized method and examples. Journal of Metamorphic Geology, 24, 655-668.

** Konrad-Schmolke, M.; Handy, M.R.; Babist, J. & O’Brien, P.J. (2006): The Physico-Chemical Properties of a Subducted Slab from Garnet Zonation Patterns (Sesia Zone, Western Alps), Journal of Petrology, 47, 2123-2148

*** Kröner, A., Wilde, S.A., Zhao, G.C., O’Brien, P.J., Sun, M., Liu, D.Y., Wan, Y.S., Liu, S.W., Guo, J.H. (2006): Zircon chronology and metamorphic evolution of mafic dykes in the Hengshan Complex of North China: evidence for late Proterozoic extension and subsequent high pressure metamorphism in the North China Craton. Precambrian Research, 146, 45-67

* O’Brien, P.J. (2006) Type-locality granulites: high pressure rocks formed at eclogite-facies conditions. Mineralogy and Petrology, 86, 161-175.

*** Kröner, A., Wilde, S.A., O’Brien, P.J., Li, J.H., Passchier, C.W., Walte, N.P., Liu, D.Y. (2005): Field relationships, geochemistry, zircon ages and evolution of a late Archaean to Palaeoproterozoic lower crustal section in the Hengshan terrain of northern China. Acta Geologica Sinica (English Edition), vol. 79, p. 605-632

** Konrad-Schmolke, M., Handy, M.R., Babist, J. and O´Brien, P.J. (2005): Thermodynamic modelling of diffusion-controlled garnet growth. Contributions to Mineralogy and Petrology, 149, 181-195

*** O’Brien, P.J., Walte, N., Li, J.H.(2005): The petrology of two distinct granulite types in the Hengshan Mts, China, and tectonic implications. Journal of Asian Earth Sciences, 24, 615-627.

*** Carswell, D.A., Brueckner, H.K., Cuthbert, S.J., Mehta, K., 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, 21, 601-612.

*** Treloar, P.J., O’Brien, P.J., Parrish, R.R., Khan, M.A. (2003): Exhumation of early Tertiary, coesite-bearing eclogites from the Pakistan Himalaya. Journal of the Geological Society, London, 160, 367-376

** Carswell, D.A., Tucker, R.D., O’Brien, P.J., Krogh, T.E. (2003): Coesite Micro-Inclusions and the U-Pb Age of Zircons from the Hareidland Eclogite in the Western Gneiss Region of Norway. Lithos, 67, 181-190

*** O’Brien, P.J., Rötzler, J. (2003): High-Pressure Granulites: Formation, Recovery of Peak Conditions, and Implications for Tectonics. Journal of Metamorphic Geology, 21, 3-20

*** Guo, J.H., O’Brien, P.J., Zhai, M.G. (2002): High pressure granulites in the Sanggan area, North China craton: metamorphic evolution, P-T paths and geotectonic significance. Journal of Metamorphic Geology, 20, 741-756.

*** Möller, A., O’Brien, P.J., Kennedy, A., Kröner, A.(2002): Polyphase zircon in ultrahigh-temperature granulites (Rogaland, SW Norway): constraints for Pb diffusion. Journal of Metamorphic Geology, 20, 727-740.

*** O’Brien, P.J. (2001): Subduction followed by Collision: Alpine and Himalayan examples. In: Rubie, D.C. & van der Hilst, R. (eds), Processes and Consequences of Deep Subduction, Physics of the Earth and Planetary Interiors, 127, 277-291.

** Cooke, R.A.; O’Brien, P.J. (2001): Resolving the relationship between high P-T rocks and gneisses in collisional terranes: an example from the Gföhl gneiss-granulite association in the Moldanubian Zone, Austria. Lithos, 58, 33-54.

*** O’Brien, P.J.; Zotov, N.; Law, R.; Khan, M.A.; Jan, M.Q. (2001) Coesite in Himalayan eclogite and implications for models of India-Asia collision. Geology, v29, 435-438

** Li, J.H., Kröner, A., Qian, X.L., O’Brien, P.J. (2000) Tectonic evolution of an early Precambrian high-pressure granulite belt in the North China Craton. Acta Geologica Sinica, 74, 246-258.

** Cooke, R; O’Brien, P.J.; Carswell, D.A. (2000) Garnet zoning and the identification of equilibrium mineral compositions in high-pressure–temperature granulites from the Moldanubian Zone, Austria. Journal of Metamorphic Geology, 18, 551-569.

*** Kröner, A; O’Brien, P.J.; Nemchin, A.A., Pidgeon, R.T. (2000) Zircon ages for high pressure granulites from South Bohemia, Czech Republic, and their connection to Carboniferous high temperature processes. Contributions to Mineralogy and Petrology, 138, 127-142.

O’Brien, P.J.; McConnell, J.D.C. (1999) An enigmatic report of unmixing of calcic plagioclase to oligoclase and anorthite finally resolved. European Journal of Mineralogy, 11, 915-918.

** Janák, M.; Hurai, V.; Ludhová, L.; O’Brien, P.J.; Horn, E.E. (1999) Dehydration melting and devolatilization during exhumation of high-grade metapelites: the Tatra Mountains, Western Carpathians. Journal of Metamorphic Geology, 17, 379-395.

** O’Brien, P.J. (1999) Asymmetric zoning profiles in garnet from HP-HT granulite and implications for volume and grain boundary diffusion. Mineralogical Magazine, 63, 227-238.

*** O’Brien, P.J. (1997): Garnet zoning and reaction textures in overprinted eclogites, Bohemian Massif, European Variscides: a record of their thermal history during exhumation. Lithos, 41, 119-133

** O’Brien, P.J.; Duyster, J.; Grauert, B.; Schreyer, W.; Stöckhert, B.; Weber, K. (1997): Crustal evolution of the KTB drill site: from oldest relics to the late Hercynian granites. Journal of Geophysical Research, 102 (B8), 18203-18220.

*** O’Brien, P.J.; Kröner; A.; Jaekel, P.; Hegner, E.; Źelażniewicz, A.; Kryza. R.(1997) Petrological and isotopic studies on Palaeozoic high pressure granulites, Góry Sowie (Owl) Mts., Polish Sudetes. Journal of Petrology, 38, 433-456

*** Carswell, D.A.; O’Brien, P.J.; Wilson, R.N. & Zhai, M. (1997): Thermobarometry of phengite-bearing eclogites in the Dabie Mountains of central China. Journal of Metamorphic Geology, 15, 239-252.

** Janák, M.; O’Brien, P.J.; Hurai, V.; Reutel, C. (1996): Metamorphic evolution and fluid composition of garnet-clinopyroxene amphibolites from the Tatra Mountains, Western Carpathians. Lithos, 39, 57-79

*** O’Brien, P.J.; Vrána, S. (1995): Eclogites with a short-lived granulite facies overprint in the Moldanubian Zone, Czech Republic: petrology, geochemistry and diffusion modelling of garnet zoning. Geologische Rundschau, 84, 473-488.

*** O’Brien, P.J. & Carswell, D.A. (1993): The tectonometamorphic evolution of the Bohemian Massif: evidence from High Pressure metamorphic rocks. Geologische Rundschau, 82, 531-555

*** Carswell, D.A. & O’Brien, P.J. (1993): Thermobarometry and geotectonic significance of High Pressure granulites: examples from the Moldanubian Zone of the Bohemian Massif in Lower Austria. Journal of Petrology, 34, 427-459

** O’Brien, P.J. (1993): Partially retrograded eclogites of the Münchberg Massif, Germany: records of a multistage Variscan uplift history in the Bohemian Massif. Journal of Metamorphic Geology, 11, 241-260

** O’Brien, P.J., Röhr, C, Okrusch, M., Patzak, M. (1992): Eclogite facies relics and a multistage breakdown in metabasites of the KTB pilot hole, NE Bavaria: implications for the Variscan tectonometamorphic evolution of the NW Bohemian Massif. Contributions to Mineralogy and Petrology, 112, 261-278.

* Okrusch, M.; Matthes, S.; Klemd, R.; O’Brien, P.J.; Schmidt, K. (1991): Eclogites at the Northwestern Margin of the Bohemian Massif: a Review. European Journal of Mineralogy, 3, 707-730.

* Carswell, D.A.; Möller; C.; O’Brien, P.J. (1989): Origin of sapphirine symplectites in metabasites from Mitterbachgraben, Dunkelsteinerwald granulite complex, Lower Austria. European Journal of Mineralogy, 1, 455-466.

** O’Brien, P.J. (1989): The petrology of retrograded eclogites of the Oberpfalz Forest, northeastern Bavaria, West Germany. In: Meissner, R. and Gebauer, D. (Eds.) The Evolution of the European Continental Crust: Deep Drilling, Geophysics, Geology and Geochemistry. Tectonophysics, 157, 195-212

Reviewed editorial, comment-reply, book, and non-ISI publications

O’Brien, P.J. (2006): The age of deep, steep continental subduction in the NW Himalaya: relating zircon growth to metamorphic history. Comment and Reply. Earth and Planetary Science Letters, 245, 814-816.

O’Brien, P.J. (2005), "Metamorphic Rocks: PTt - Paths", In: Encyclopedia of Geology (Richard C. Selley, L. Robin M. Cocks and Ian R. Plimer, eds.), Elsevier, Oxford, Vol. 3, pp. 409-417

*** Möller, A., O’Brien, P.J., Kennedy, A., Kröner, A. (2003): Linking growth episodes of zircon and metamorphic textures to zircon chemistry: an example from the ultra-high temperature granulites of Rogaland (SW Norway). In: Vance, D., Müller, W., Villa, I.M. (eds), Geochronology: Linking the Isotopic Record with Petrology and Textures, Geological Society London, Special Publication 220, 65-81.

*** Massonne, H.-J. & O’Brien, P.J. (2003): The Bohemian Massif and the NW Himalayas, In: Carswell, D.A. & Compagnoni, R. (eds.), Ultrahigh Pressure Metamorphism, EMU Notes in Mineralogy, 5, European Mineralogical Union, Eötvös University Press, Budapest, 145-187.

Takasu, A., Hirajima, T., Medaris, L.G. Jr., O’Brien, P.J. (editors), (2003). Sixth international eclogite conference. Eclogites and related high and ultrahigh pressure metamorphic rocks, Preface. Lithos, 70, vii-x

* Kröner. A., Zhao, G.C., Wilde, S.A., Zhai, M.G., Passchier, C.W., Sun, M., Guo, J.H., O’Brien, P.J., Walte, N. (2002). A Late-Archean to Palaeoproterozoic lower to upper crustal section in the Hengshan-Wutaishan area of North China. Guidebook for Penrose Conference Field Trip, 63pp

*** O’Brien, P.J. (2000) The fundamental Variscan problem: high-temperature metamorphism at different depths and high-pressure metamorphism at different temperatures. In: Franke, W., Haak, V., Onken, O. & Tanner, D. (eds.) Orogenic Processes: quantification and modelling in the Variscan Belt. Geological Society, London, Special publications, 179, 369-386

Treloar, P.J.; O’Brien, P.J. (1998) Introduction. In: Treloar, P.J. & O’Brien, P.J. (Eds.) What Drives Metamorphism and Metamorphic Reactions? Geological Society, London, Special Publications, 138, 1-5.

O’Brien, P.J. (1997) Granulite facies overprints of eclogites: short-lived events deduced from diffusion modeling. In: Qian, X., You, Z., Jahn, B-M., Halls, H.C. (Eds.) Precambrian Geology and Metamorphic Petrology, Proceedings of the 30th International Geological Congress, vol 17, part II, 157-171.

Brown, M.; O’Brien, P.J. (1997) Evolution of metamorphic belts: a changing view. In: Qian, X., You, Z., Jahn, B-M., Halls, H.C. (Eds.) Precambrian Geology and Metamorphic Petrology, Proceedings of the 30th International Geological Congress, vol 17, part II, 217-231.

O’Brien, P.J.; Vrána, S. (1997): The eclogites in the Monotonous Series of the Moldanubian zone and the theory of thermal pulses: a reply. Geologische Rundschau, 86, 716-719

Spears, D.A.; O’Brien, P.J. (1995): Origin of British Tonsteins and Tectonomagmatic Implications. Zentralblatt für Geologie und Paläontologie Teil I, 491-497.

O’Brien, P.J. (1994): The formation of sapphirine and orthopyroxene during overprinting of Mariánské Lázne Complex eclogites. Zentralblatt für Geologie und Paläontologie, Teil I, 827-836.

Janák, M.; Bezák, V.; Broska, I.; Fritz, H.; Kahan, Š.; Kohút, M.; Neubauer, F.; O’Brien, P.J.; Onstott, T.C.; Reichwalder, P.; Uher, P. (1993): Deformation, metamorphism and granitoid magmatism in the Tatry Mts. (Central Western Carpathians, Tatric unit): records of Variscan and Alpine orogeny. In: Pre-Alpine Events in the Western Carpathians' Realm (PAEWCR) Conference, Stará Lesná, Slovakia, Sept 1993, Excursion Guide, 51-61.

O’Brien, P.J. (1993): Münchberg Massif eclogites: multiple metamorphic overprints and implications for P-T-t paths. Zeitschrift für Geologische Wissenschaften, 21, 217-224

O’Brien, P.J. (1991). High Pressure Metamorphism in the NW Bohemian Massif: Comparisons and Contrasts between the Moldanubian Zone, Münchberg Massif, ZEV, ZTT and Erzgebirge. KTB Report 91-1, 1-12.

** O’Brien, P.J., Carswell, D.A.; Gebauer, D. (1990): Eclogite Formation and Distribution in the European Variscides. In: Carswell, D.A. (Ed.) Eclogite Facies Rocks. Blackie & Son Ltd., Glasgow, 204-224.

O’Brien, P.J. (1989): A study of retrogression in eclogites of the Oberpfalz Forest, north-east Bavaria, West Germany, and their significance in the tectonic evolution of the Bohemian Massif. In: Daly, J.S.; Cliff, R.A. and Yardley, B.W.D. (Eds.) Evolution of Metamorphic Belts. Geological Society London, Special Publication No. 43, 507-512.

Excursion guides

O’Brien, P.J. (2009): Granulite type location: Saxonian Granulitgebirge, Germany. In: Schulmann, K (ed): Granulites and Granulites: partial melting and crustal rheology of orogenic lower crust, pre- and post-conference excursion guides.

O’Brien, P.J. & Oberhänsli, R. (2008): Petrology of Prydz Bay granulites. In: Hubberton, H.-W. (ed). The expedition of the research vessel "Polarstern" to the Antarctic in 2007 (ANT-XXIII/9). Berichte zur Polar- und Meeresforschung = Reports on polar and marine research, 583, 102-106

O’Brien, P.J.; Kryza, R., (2001): 79. Jahrestagung der DMG, 9-14.9.2001, Potsdam. Exkursion 1. The Variscan basement of the Polish Sudetes. European Journal of Mineralogy, 13 (Beih), 213-229.

O’Brien, P.J. (1999); Field excursion guide "Sesia Zone and Monte Mucrone (with a brief introduction into the geology of the European Alps)". Processes and Consequences of Deep Subduction, 5-11.9.1999, Verbania, Italy, 19pp.

Franke, W.; O’Brien, P.J.; Stein, E. (1998): Münchberg klippe and Saxothuringian par-autochthon. In: The NW part of the Bohemian Massif: Saxothuringian Zone and Tepla-Barrandian Block. International Conference 'Palaeozoic orogenesis and crustal evolution of the European lithosphere', Pre-conference excursion 28-30.9.1998, Charles University, Prague, p3-15.

O’Brien, P.J. . (1996): “Eclogites and related rocks of the Münchberg Massif”, EMPG-VI excursion, 13.4.1996, pp18.

Jelinek, E., O’Brien, P.J., Stedra, V., Bowes, D.R., & Medaris, L.G. (1995): “Mariánské Lázně Complex”, Combined excursion of the Metamorphic Studies Group, U.K., Faculty of Science, Charles University und Czech Geological Survey, Prague, p35-59.

O’Brien, P.J. (1995): “The metamorphic geology of the northwestern Bohemian Massif”, Combined excursion of the Metamorphic Studies Group, U.K., Faculty of Science, Charles University and Czech Geological Survey, Prague, pp54.

O’Brien, P.J. (1990): International conference on Palaeozoic Orogens in Central Europe, Excursion Guide Bohemian Massif. Stop 11, Winklarn, "Polymetamorphic peridotites, Pyroxenites, eclogites and metapelites", p160-163

Okrusch, M., Matthes, S., Klemd, R., O’Brien, P.J., & Schmidt, K. (1989): Third International Eclogite Conference, post-conference excursion guide "Eclogites at the northwestern margin of the Bohemian Massif, p1-50

O’Brien, P.J. (1986). The Geology of the Bohemian Massif. Journal of the University of Sheffield Geological Society, 8, 229-239

Theses

O’Brien, P.J. (1999): Die Quantifikation orogener Prozesse anhand von Druck-Temperatur- Zeit-Pfaden in Eklogiten und Granuliten: Beispiele aus der Böhmischen Masse. Habilitationsschrift, Universität Bayreuth

O’Brien, P.J. (1989): The petrology of eclogites and related rocks from the Bavarian Margin of the Bohemian Massif, West Germany. Ph.D. Thesis, Univ. Sheffield (2 volumes) Book Reviews“Pre-Mesozoic Geology in the Alps” by J.F. von Raumer and F. Neubauer. Mineralogical Magazine, 58, 526-527 (1994).