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
Metamorphism in Archaean greenstone belts: calculated fluid compositions and implications for gold mineralization
Journal of Metamorphic Geology - Tập 9 Số 2 - Trang 141-150 - 1991
Roger Powell, Thomas Will, G. Neil Phillips
An inescapable consequence of the metamorphism of greenstone belt sequences is the release of a large volume of metamorphic fluid of low salinity with chemical characteristics controlled by the mineral assemblages involved in the devolatilization reactions. For mafic and ultramafic sequences, the composition of fluids released at upper greenschist to lower amphibolite facies conditions for...... 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
Mixing properties of phengitic micas and revised garnet‐phengite thermobarometers
Journal of Metamorphic Geology - Tập 20 Số 7 - Trang 683-696 - 2002
R.M. Coggon, T. J. B. Holland
AbstractMixing properties for muscovite–celadonite–ferroceladonite solid solutions are derived from combining available experimental phase equilibrium data with tabulated thermodynamic data for mineral end‐members. When a partially ordered solution model is assumed, the enthalpy of mixing among the end‐members muscovite–celadonite–ferroceladonite is nearly ideal, a...... hiện toàn bộ
Petrology, geochronology, and tectonics of shear zones in the Zermatt–Saas and Combin zones of the Western Alps
Journal of Metamorphic Geology - Tập 20 Số 2 - Trang 263-281 - 2002
Ian Cartwright, A. C. Barnicoat
AbstractMetre to tens‐of‐metre wide, steeply dipping, greenschist facies shear zones that cut blueschists and eclogites of the Combin and Zermatt–Saas Zones at Täschalp and in adjacent areas of the western Alps were sites of extensive recrystallization driven by fluid flow and deformation. Rb–Sr data imply that these shear zones formed at...... hiện toàn bộ
Serpentinites of the Zermatt‐Saas ophiolite complex and their texture evolution
Journal of Metamorphic Geology - Tập 22 Số 3 - Trang 159-177 - 2004
Zhang Li, Meinert Rahn, Kurt Bucher
AbstractThe Zermatt‐Saas serpentinite complex is an integral member of the Penninic ophiolites of the Central Alps and represents the mantle part of the oceanic lithosphere of the Tethys. Metamorphic textures of the serpentinite preserve the complex mineralogical evolution from primary abyssal peridotite through ocean‐floor hydration, subduction‐related high‐pressu...... hiện toàn bộ
Eclogitization of the Monviso ophiolite (W. Alps) and implications on subduction dynamics
Journal of Metamorphic Geology - Tập 30 Số 1 - Trang 37-61 - 2012
Samuel Angiboust, Ryan Langdon, Philippe Agard, David J. Waters, Christian Chopin
AbstractTo constrain deep (40–100 km) subduction dynamics, extensive P–T data are provided on the eclogitic Monviso ophiolite derived from the subducted Liguro‐Piemontese oceanic lithosphere (which was exhumed, together with associated continental units, before the Alpine collision). The Monviso ophiolite has so far been interpreted eithe...... hiện toàn bộ
How continuous and precise is the record of P–T paths? Insights from combined thermobarometry and thermodynamic modelling into subduction dynamics (Schistes Lustrés, W. Alps)
Journal of Metamorphic Geology - Tập 30 Số 3 - Trang 323-346 - 2012
Alexis Plunder, Philippe Agard, Benoît Dubacq, Christian Chopin, Mathieu Bellanger
AbstractPressure–temperature (P–T) paths as complete as possible and with a precision on the km‐scale or less are needed to further improve the knowledge of deformation, re‐equilibration processes and element/fluid transfer, in particular along subduction zones. This contribution attempts to (i) critically evaluate the precision and conti...... 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
Exhumation of the Schistes Lustrés complex: in situ laser probe 40Ar/39Ar constraints and implications for the Western Alps
Journal of Metamorphic Geology - Tập 20 Số 6 - Trang 599-618 - 2002
Philippe Agard, Patrick Monié, Laurent Jolivet, Bruno Goffé
AbstractThe Schistes Lustrés (SL) suture zone occupies a key position in the Alpine chain between the high‐pressure (HP) Brianconnais domain and the ultrahigh‐pressure (UHP) Dora Maira massif, and reached subduction depths ranging from c. 40–65 km (Cottian Alps). In order to constrain the timing of HP metamorphism and subsequent exhumatio...... hiện toàn bộ
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