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
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‐grade
Teth...
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
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 the nec...
Interlayer and Si content of phengite in HP–LT carpholite‐bearing metapelites
Journal of Metamorphic Geology - Tập 19 Số 5 - Trang 479-495 - 2001
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
rock samples were sampled in metapelites metamorphosed at conditions varying
from 350 °C...
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
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 42–37 Ma with a systematic younging of structures
northward...
Mixing properties of phengitic micas and revised garnet‐phengite thermobarometers
Journal of Metamorphic Geology - Tập 20 Số 7 - Trang 683-696 - 2002
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, although the Gibbs
energies of mus...
Serpentinites of the Zermatt‐Saas ophiolite complex and their texture evolution
Journal of Metamorphic Geology - Tập 22 Số 3 - Trang 159-177 - 2004
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‐pressure overprint,
meso‐Alpine greensc...
Eclogitization of the Monviso ophiolite (W. Alps) and implications on subduction dynamics
Journal of Metamorphic Geology - Tập 30 Số 1 - Trang 37-61 - 2012
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 either as a fossilized subduction channel,
with tectonic blocks d...
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
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 Piemontese–Ligurian
palaeo‐subduction ...
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
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 continuity with which metamorphic P–T histories are
retrieved tod...
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
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 exhumation, several phengite generations were
differentiated, on the ...
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