Journal of Metamorphic Geology

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Tectonometamorphic evolution of the Himalayan metamorphic core between the Annapurna and Dhaulagiri, central Nepal
Journal of Metamorphic Geology - Tập 14 Số 5 - Trang 635-656 - 1996
Jean‐Claude Vannay, K. V. Hodges
The metamorphic core of the Himalaya in the Kali Gandaki valley of central Nepal corresponds to a 5‐km‐thick sequence of upper amphibolite facies metasedimentary rocks. This Greater Himalayan Sequence (GHS) thrusts over the greenschist to lower amphibolite facies Lesser Himalayan Sequence (LHS) along the Lower Miocene Main Central Thrust (MCT), and it is separated from the overlying low‐gr...... hiện toàn bộ
Interlayer and Si content of phengite in HP–LT carpholite‐bearing metapelites
Journal of Metamorphic Geology - Tập 19 Số 5 - Trang 479-495 - 2001
Philippe Agard, Olivier Vidal, Bruno Goffé
AbstractPhengite occurring along with carpholite±lawsonite and/or chloritoid in HP–LT domains shows not only variable Si–(Mg+Fe) contents, but also variable interlayer contents (IC). To determine whether these chemical variations are coherently related to variation in P–T conditions on a regional scale, c. 100 r...... hiện toàn bộ
TheP–Tpath of the ultra‐high pressure Lago Di Cignana and adjoining high‐pressure meta‐ophiolitic units: insights into the evolution of the subducting Tethyan slab
Journal of Metamorphic Geology - Tập 27 Số 3 - Trang 207-231 - 2009
Chiara Groppo, Marco Beltrando, Roberto Compagnoni
AbstractThe Lago di Cignana ultra‐high‐pressure unit (LCU), which consists of coesite–eclogite facies metabasics and metasediments, preserves the most deeply subducted oceanic rocks worldwide. New constraints on the prograde and early retrograde evolution of this ultra‐high pressure unit and adjoining units provide important insights into the evolution of the Piemo...... hiện toàn bộ
Geochronology and geological evolution of metamorphic rocks in the Field Islands area, East Antarctica
Journal of Metamorphic Geology - Tập 1 Số 4 - Trang 277-303 - 1983
Lachlan E. Black, Patrick James, Simon L. Harley
Detailed geochronological, structural and petrological studies reveal that the geological evolution of the Field Islands area, East Antarctica, was substantially similar to that of the adjacent Archaean Napier Complex, though with notable differences in late and post Archaean times. These differences reflect the area's proximity to the Proterozoic Rayner Complex and consequent vulnerabilit...... hiện toàn bộ
METPET: Metamorphic petrology microcomputer programs
Journal of Metamorphic Geology - Tập 8 Số 3 - Trang 251-256 - 1990
David G. A. Ball, Pierre‐Yves F. Robin
METPET is a package of three interactive microcomputer (IBM PC or compatible) programs. FILEMAN is a utility program to create, edit and print ‘composition files’, i.e. files containing the records of chemical compositions of minerals or rocks, expressed in terms of primary chemical components. PROJECT recalculates selected compositions in terms of new (... hiện toàn bộ
Importance of fracturing during retro‐metamorphism of eclogites
Journal of Metamorphic Geology - Tập 17 Số 6 - Trang 637-652 - 1999
Straume, Austrheim
Presented textural and petrological data show that the deep to intermediate continental crust may fracture and that microfractures are the locus of fluid and mass transfer necessary for retrograde metamorphism. Kyanite eclogites from Ulsteinvik, Norway, underwent partial retrogression to granulite and amphibolite facies assemblages during near‐isothermal exhumation from depths equivalent t...... hiện toàn bộ
Partial transformation of gabbro to coesite‐bearing eclogite from Yangkou, the Sulu terrane, eastern China
Journal of Metamorphic Geology - Tập 15 Số 2 - Trang 183-202 - 1997
R. Y. Zhang, J. G. Liou
An ultra‐high‐pressure (UHP) metamorphic slab at Yangkou Beach near Qingdao in the Sulu region of China consists of blocks of eclogite facies metagabbro, metagranitoid, ultramafic rock and mylonitic orthogneisses enclosed in granitic gneiss. A gradational sequence from incipiently metamorphosed gabbro to completely recrystallized coesite eclogite formed at ultra‐high‐pressures was identifi...... hiện toàn bộ
Structural development and petrofabrics of eclogite facies shear zones, Bergen Arcs, western Norway: implications for deep crustal deformational processes
Journal of Metamorphic Geology - Tập 10 Số 2 - Trang 127-146 - 1992
T. M. Boundy, David M. Fountain, Håkon Austrheim
Caledonian eclogite facies shear zones developed from Grenvillian garnet granulite facies anorthosites and gabbros in the Bergen Arcs of western Norway allow direct investigation of the relations between macroscopic structures and crystallographic preferred orientation (CPO) in lower continental crust. Field relations on the island of Holsnøy show that the eclogites formed locally from gra...... hiện toàn bộ
Discrete ultrahigh‐pressure domains in the Western Gneiss Region, Norway: implications for formation and exhumation
Journal of Metamorphic Geology - Tập 23 Số 1 - Trang 45-61 - 2005
D. B. Root, Bradley R. Hacker, Phillip B. Gans, Mihai N. Ducea, Elizabeth A. Eide, J. L. Mosenfelder
AbstractNew eclogite localities and new 40Ar/39Ar ages within the Western Gneiss Region of Norway define three discrete ultrahigh‐pressure (UHP) domains that are separated by distinctly lower pressure, eclogite facies rocks. The sizes of the UHP domains range from c. 2500 to 100 km2... hiện toàn bộ
SHRIMP U–Pb dating of coesite‐bearing zircon from the ultrahigh‐pressure metamorphic rocks, Sulu terrane, east China
Journal of Metamorphic Geology - Tập 21 Số 6 - Trang 551-560 - 2003
J. Yang, J. L. Wooden, Chunxia Wu, F. L. Liu, Z. Q. Xu, Rupan Shi, Ikuo Katayama, J. G. Liou, S. Maruyama
AbstractThis paper provides further evidence for the ongoing discussion as to whether the Dabie UHPM belt formed in Triassic or Palaeozoic time, and whether the Sulu UHPM belt formed in Triassic or Neoproterozoic time. Combined use of laser Raman spectrometer (LR), cathodoluminescence imaging (CL), and ion probe U–Pb in‐situ dating (SHRIM...... hiện toàn bộ
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