Update search
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
NARROW
Format
Article Type
Journal
Publisher
Section
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Arctic region
-
Svalbard
-
Spitsbergen (1)
-
-
-
Asia
-
Altai Mountains
-
Gorny Altai (2)
-
-
Altai Russian Federation
-
Gorny Altai (2)
-
-
Central Asia
-
Kazakhstan
-
Kokchetav Kazakhstan (1)
-
-
-
Far East
-
China
-
Gansu China (1)
-
Henan China (1)
-
Qilian Mountains (1)
-
Xizang China
-
Lhasa Block (1)
-
-
-
Mongolia (1)
-
-
Himalayas (2)
-
Indian Peninsula
-
India (1)
-
Jammu and Kashmir
-
Ladakh (2)
-
-
-
Sayan
-
Western Sayan (1)
-
-
Tibetan Plateau (1)
-
Tien Shan (2)
-
-
Atlantic Ocean (1)
-
Canada
-
Western Canada
-
British Columbia
-
Pinchi Lake (1)
-
-
-
-
Caribbean region
-
West Indies
-
Antilles
-
Greater Antilles
-
Cuba (1)
-
-
-
Caribbean Mountain Range (1)
-
-
-
Central America
-
Guatemala
-
Motagua Fault (1)
-
-
-
Commonwealth of Independent States
-
Kazakhstan
-
Kokchetav Kazakhstan (1)
-
-
Russian Federation
-
Altai Russian Federation
-
Gorny Altai (2)
-
-
-
-
Diablo Range (2)
-
Europe
-
Alps
-
Allgau Alps (1)
-
Eastern Alps
-
Hohe Tauern (1)
-
-
Piedmont Alps
-
Dora Maira Massif (1)
-
-
Swiss Alps (1)
-
Western Alps
-
Cottian Alps
-
Dora Maira Massif (1)
-
-
-
-
Central Europe
-
Allgau Alps (1)
-
Austria
-
Hohe Tauern (1)
-
Tyrol Austria (1)
-
Vorarlberg Austria (2)
-
-
Germany
-
Bavaria Germany (1)
-
-
Switzerland
-
Swiss Alps (1)
-
Valais Switzerland
-
Zermatt Switzerland (2)
-
-
-
-
Southern Europe
-
Greece
-
Euboea (1)
-
Greek Aegean Islands
-
Cyclades
-
Syros (1)
-
-
Dodecanese (1)
-
-
Hellenides (1)
-
Sterea Ellas
-
Laurion Greece (1)
-
-
-
Italy
-
Ivrea-Verbano Zone (1)
-
Piemonte Italy
-
Dora Maira Massif (1)
-
-
-
-
Variscides (1)
-
Western Europe
-
Cottian Alps
-
Dora Maira Massif (1)
-
-
France
-
Brittany (1)
-
Corsica (1)
-
Morbihan France
-
Groix Island (2)
-
-
-
Scandinavia
-
Western Gneiss region (1)
-
-
United Kingdom
-
Great Britain
-
Wales
-
Caernarvonshire Wales
-
Lleyn Peninsula (1)
-
-
Gwynedd Wales
-
Lleyn Peninsula (1)
-
-
-
-
-
-
-
Llanos (1)
-
Mediterranean region
-
Aegean Islands
-
Greek Aegean Islands
-
Cyclades
-
Syros (1)
-
-
Dodecanese (1)
-
-
-
-
North America
-
North American Cordillera (1)
-
-
Oceania
-
Melanesia
-
New Caledonia (3)
-
-
-
Pacific Ocean (1)
-
Quesnellia Terrane (1)
-
South America
-
Andes
-
Central Andes (1)
-
-
Colombia (1)
-
Venezuela (2)
-
-
United States
-
Alaska
-
Ambler River Quadrangle (1)
-
Baird Mountains Quadrangle (1)
-
Brooks Range (1)
-
-
California
-
Central California (1)
-
Marin County California (1)
-
Mendocino County California (1)
-
San Benito County California (1)
-
Santa Clara County California (1)
-
Sonoma County California (1)
-
-
Vermont (3)
-
-
-
commodities
-
mineral deposits, genesis (1)
-
-
elements, isotopes
-
boron
-
B-11/B-10 (1)
-
-
chemical ratios (1)
-
halogens
-
fluorine (1)
-
-
isotope ratios (2)
-
isotopes
-
radioactive isotopes
-
Ar-40/Ar-39 (1)
-
Rb-87/Sr-86 (1)
-
-
stable isotopes
-
Ar-40/Ar-39 (1)
-
B-11/B-10 (1)
-
O-18 (1)
-
Rb-87/Sr-86 (1)
-
Sr-87/Sr-86 (1)
-
-
-
metals
-
alkali metals
-
rubidium
-
Rb-87/Sr-86 (1)
-
-
sodium (1)
-
-
alkaline earth metals
-
calcium (1)
-
magnesium (3)
-
strontium
-
Rb-87/Sr-86 (1)
-
Sr-87/Sr-86 (1)
-
-
-
aluminum (1)
-
gallium (1)
-
iron (1)
-
-
noble gases
-
argon
-
Ar-40/Ar-39 (1)
-
-
-
oxygen
-
O-18 (1)
-
-
-
geochronology methods
-
Ar/Ar (7)
-
K/Ar (2)
-
optical mineralogy (1)
-
U/Pb (1)
-
-
geologic age
-
Cenozoic
-
Quaternary
-
Holocene (1)
-
-
Tertiary
-
Neogene
-
Miocene (1)
-
-
Paleogene
-
Eocene
-
middle Eocene
-
Lutetian (1)
-
-
-
Oligocene (1)
-
-
-
-
Mesozoic
-
Cretaceous
-
Lower Cretaceous (1)
-
Upper Cretaceous
-
Turonian (1)
-
-
-
Franciscan Complex (4)
-
Jurassic
-
Upper Jurassic (1)
-
-
Triassic (2)
-
-
Paleozoic
-
Cambrian
-
Upper Cambrian (1)
-
-
Carboniferous (1)
-
Devonian (1)
-
Ordovician
-
Lower Ordovician
-
Arenigian (1)
-
Tremadocian (1)
-
-
-
-
Precambrian
-
upper Precambrian
-
Proterozoic (1)
-
-
-
-
igneous rocks
-
igneous rocks
-
plutonic rocks
-
ultramafics
-
peridotites
-
dunite (1)
-
-
pyroxenite (1)
-
-
-
volcanic rocks
-
andesites
-
boninite (1)
-
-
basalts
-
alkali basalts (1)
-
mid-ocean ridge basalts (1)
-
ocean-island basalts (1)
-
tholeiite (1)
-
-
pyroclastics (1)
-
-
-
ophiolite (2)
-
-
metamorphic rocks
-
metamorphic rocks
-
amphibolites (3)
-
eclogite (11)
-
metaigneous rocks
-
metabasalt (3)
-
metabasite (3)
-
serpentinite (4)
-
-
metasedimentary rocks
-
metachert (1)
-
metagraywacke (3)
-
-
metasomatic rocks
-
serpentinite (4)
-
-
metavolcanic rocks (4)
-
quartzites (1)
-
schists
-
blueschist (9)
-
glaucophane schist (4)
-
greenschist (3)
-
-
-
ophiolite (2)
-
-
minerals
-
carbonates
-
aragonite (4)
-
calcite (1)
-
dolomite (1)
-
magnesite (1)
-
-
halides
-
fluorides
-
clinohumite (1)
-
-
-
minerals (6)
-
native elements
-
diamond (1)
-
-
oxides
-
ilmenite (1)
-
-
phosphates
-
apatite (2)
-
-
silicates
-
asbestos (2)
-
chain silicates
-
amphibole group
-
alkalic amphibole (1)
-
clinoamphibole
-
actinolite (10)
-
arfvedsonite (2)
-
crossite (1)
-
cummingtonite (3)
-
glaucophane (63)
-
grunerite (1)
-
hornblende (3)
-
magnesioriebeckite (1)
-
pargasite (2)
-
richterite (1)
-
riebeckite (3)
-
tremolite (6)
-
tschermakite (2)
-
-
orthoamphibole
-
anthophyllite (1)
-
-
-
pyroxene group
-
clinopyroxene
-
augite (1)
-
jadeite (8)
-
omphacite (3)
-
-
-
-
framework silicates
-
feldspar group
-
plagioclase
-
albite (2)
-
-
-
silica minerals
-
coesite (4)
-
quartz (4)
-
-
-
orthosilicates
-
nesosilicates
-
clinohumite (1)
-
garnet group
-
grossular (1)
-
pyrope (1)
-
-
olivine group
-
olivine (1)
-
-
titanite group
-
titanite (1)
-
-
zircon group
-
zircon (1)
-
-
-
sorosilicates
-
epidote group
-
epidote (4)
-
zoisite (1)
-
-
lawsonite (10)
-
pumpellyite group
-
pumpellyite (2)
-
-
-
-
ring silicates
-
tourmaline group (1)
-
-
sheet silicates
-
chlorite group
-
chlorite (2)
-
-
clay minerals
-
hectorite (1)
-
saponite (1)
-
smectite (2)
-
vermiculite (1)
-
-
mica group
-
muscovite (4)
-
paragonite (2)
-
phengite (10)
-
-
serpentine group
-
chrysotile (1)
-
serpentine (2)
-
-
talc (5)
-
-
-
-
Primary terms
-
absolute age (9)
-
Arctic region
-
Svalbard
-
Spitsbergen (1)
-
-
-
Asia
-
Altai Mountains
-
Gorny Altai (2)
-
-
Altai Russian Federation
-
Gorny Altai (2)
-
-
Central Asia
-
Kazakhstan
-
Kokchetav Kazakhstan (1)
-
-
-
Far East
-
China
-
Gansu China (1)
-
Henan China (1)
-
Qilian Mountains (1)
-
Xizang China
-
Lhasa Block (1)
-
-
-
Mongolia (1)
-
-
Himalayas (2)
-
Indian Peninsula
-
India (1)
-
Jammu and Kashmir
-
Ladakh (2)
-
-
-
Sayan
-
Western Sayan (1)
-
-
Tibetan Plateau (1)
-
Tien Shan (2)
-
-
Atlantic Ocean (1)
-
boron
-
B-11/B-10 (1)
-
-
Canada
-
Western Canada
-
British Columbia
-
Pinchi Lake (1)
-
-
-
-
Caribbean region
-
West Indies
-
Antilles
-
Greater Antilles
-
Cuba (1)
-
-
-
Caribbean Mountain Range (1)
-
-
-
Cenozoic
-
Quaternary
-
Holocene (1)
-
-
Tertiary
-
Neogene
-
Miocene (1)
-
-
Paleogene
-
Eocene
-
middle Eocene
-
Lutetian (1)
-
-
-
Oligocene (1)
-
-
-
-
Central America
-
Guatemala
-
Motagua Fault (1)
-
-
-
clay mineralogy (1)
-
continental drift (1)
-
crust (3)
-
crystal chemistry (4)
-
crystal structure (8)
-
dams (1)
-
data processing (2)
-
deformation (2)
-
Europe
-
Alps
-
Allgau Alps (1)
-
Eastern Alps
-
Hohe Tauern (1)
-
-
Piedmont Alps
-
Dora Maira Massif (1)
-
-
Swiss Alps (1)
-
Western Alps
-
Cottian Alps
-
Dora Maira Massif (1)
-
-
-
-
Central Europe
-
Allgau Alps (1)
-
Austria
-
Hohe Tauern (1)
-
Tyrol Austria (1)
-
Vorarlberg Austria (2)
-
-
Germany
-
Bavaria Germany (1)
-
-
Switzerland
-
Swiss Alps (1)
-
Valais Switzerland
-
Zermatt Switzerland (2)
-
-
-
-
Southern Europe
-
Greece
-
Euboea (1)
-
Greek Aegean Islands
-
Cyclades
-
Syros (1)
-
-
Dodecanese (1)
-
-
Hellenides (1)
-
Sterea Ellas
-
Laurion Greece (1)
-
-
-
Italy
-
Ivrea-Verbano Zone (1)
-
Piemonte Italy
-
Dora Maira Massif (1)
-
-
-
-
Variscides (1)
-
Western Europe
-
Cottian Alps
-
Dora Maira Massif (1)
-
-
France
-
Brittany (1)
-
Corsica (1)
-
Morbihan France
-
Groix Island (2)
-
-
-
Scandinavia
-
Western Gneiss region (1)
-
-
United Kingdom
-
Great Britain
-
Wales
-
Caernarvonshire Wales
-
Lleyn Peninsula (1)
-
-
Gwynedd Wales
-
Lleyn Peninsula (1)
-
-
-
-
-
-
-
faults (3)
-
folds (2)
-
foliation (2)
-
geochemistry (3)
-
geochronology (4)
-
geophysical methods (1)
-
heat flow (1)
-
igneous rocks
-
plutonic rocks
-
ultramafics
-
peridotites
-
dunite (1)
-
-
pyroxenite (1)
-
-
-
volcanic rocks
-
andesites
-
boninite (1)
-
-
basalts
-
alkali basalts (1)
-
mid-ocean ridge basalts (1)
-
ocean-island basalts (1)
-
tholeiite (1)
-
-
pyroclastics (1)
-
-
-
isotopes
-
radioactive isotopes
-
Ar-40/Ar-39 (1)
-
Rb-87/Sr-86 (1)
-
-
stable isotopes
-
Ar-40/Ar-39 (1)
-
B-11/B-10 (1)
-
O-18 (1)
-
Rb-87/Sr-86 (1)
-
Sr-87/Sr-86 (1)
-
-
-
lineation (1)
-
magmas (1)
-
mantle (2)
-
Mediterranean region
-
Aegean Islands
-
Greek Aegean Islands
-
Cyclades
-
Syros (1)
-
-
Dodecanese (1)
-
-
-
-
Mesozoic
-
Cretaceous
-
Lower Cretaceous (1)
-
Upper Cretaceous
-
Turonian (1)
-
-
-
Franciscan Complex (4)
-
Jurassic
-
Upper Jurassic (1)
-
-
Triassic (2)
-
-
metals
-
alkali metals
-
rubidium
-
Rb-87/Sr-86 (1)
-
-
sodium (1)
-
-
alkaline earth metals
-
calcium (1)
-
magnesium (3)
-
strontium
-
Rb-87/Sr-86 (1)
-
Sr-87/Sr-86 (1)
-
-
-
aluminum (1)
-
gallium (1)
-
iron (1)
-
-
metamorphic rocks
-
amphibolites (3)
-
eclogite (11)
-
metaigneous rocks
-
metabasalt (3)
-
metabasite (3)
-
serpentinite (4)
-
-
metasedimentary rocks
-
metachert (1)
-
metagraywacke (3)
-
-
metasomatic rocks
-
serpentinite (4)
-
-
metavolcanic rocks (4)
-
quartzites (1)
-
schists
-
blueschist (9)
-
glaucophane schist (4)
-
greenschist (3)
-
-
-
metamorphism (25)
-
metasomatism (4)
-
mineral deposits, genesis (1)
-
mineralogy (3)
-
minerals (6)
-
noble gases
-
argon
-
Ar-40/Ar-39 (1)
-
-
-
North America
-
North American Cordillera (1)
-
-
Oceania
-
Melanesia
-
New Caledonia (3)
-
-
-
orogeny (2)
-
oxygen
-
O-18 (1)
-
-
Pacific Ocean (1)
-
paleogeography (2)
-
Paleozoic
-
Cambrian
-
Upper Cambrian (1)
-
-
Carboniferous (1)
-
Devonian (1)
-
Ordovician
-
Lower Ordovician
-
Arenigian (1)
-
Tremadocian (1)
-
-
-
-
paragenesis (3)
-
petrology (13)
-
phase equilibria (12)
-
plate tectonics (13)
-
pollution (1)
-
Precambrian
-
upper Precambrian
-
Proterozoic (1)
-
-
-
reservoirs (1)
-
sedimentary petrology (1)
-
sedimentary rocks
-
clastic rocks
-
conglomerate (1)
-
sandstone (2)
-
-
-
sedimentation (4)
-
sediments
-
clastic sediments
-
dust (1)
-
sand (1)
-
-
-
South America
-
Andes
-
Central Andes (1)
-
-
Colombia (1)
-
Venezuela (2)
-
-
spectroscopy (2)
-
stratigraphy (1)
-
structural analysis (3)
-
structural geology (2)
-
tectonics (6)
-
tectonophysics (1)
-
United States
-
Alaska
-
Ambler River Quadrangle (1)
-
Baird Mountains Quadrangle (1)
-
Brooks Range (1)
-
-
California
-
Central California (1)
-
Marin County California (1)
-
Mendocino County California (1)
-
San Benito County California (1)
-
Santa Clara County California (1)
-
Sonoma County California (1)
-
-
Vermont (3)
-
-
weathering (2)
-
-
sedimentary rocks
-
flysch (1)
-
sedimentary rocks
-
clastic rocks
-
conglomerate (1)
-
sandstone (2)
-
-
-
-
sediments
-
sediments
-
clastic sediments
-
dust (1)
-
sand (1)
-
-
-
GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
glaucophane
Mineral precipitation sequence from multi-stage fluids released by eclogite during high-pressure metamorphism
Boron coordination in omphacite and glaucophane derived from inter-mineral B isotope fractionation in natural rocks
Boninitic blueschists record subduction initiation and subsequent accretion of an arc–forearc in the northeast Proto-Tethys Ocean
Clastic Sedimentary Rocks and Sedimentary Mélanges: Potential Naturally Occurring Asbestos Occurrences (Amphibole and Serpentine)
Asbestiform Minerals of the Franciscan Assemblage in California with a Focus on the Calaveras Dam Replacement Project
Tso Morari coesite eclogite: pseudosection predictions v. the preserved record and implications for tectonometamorphic models
Abstract Ultrahigh-pressure eclogites of the Tso Morari area, NW Himalaya (Ladakh, India), have been intensively investigated petrographically and petrologically with surprisingly different results. Metamorphic subduction paths based on mineral isopleths in pressure–temperature pseudosections in some studies claim concave (to the temperature axis) pressure–temperature paths predicting significant Ca–Mg–Fe garnet growth in the lawsonite and glaucophane fields: a prediction at odds with abundant epidote/clinozoisite and sodic-calcic amphibole inclusions in garnet interiors more probable along a convex path. One study deduced strong heating still at high pressures and proposed a felsic diapir rising through the mantle wedge: an explanation strongly at odds with well-documented glaucophane cores to barroisite replacing matrix omphacite requiring a cold exhumation most likely back up the subduction channel. In addition, matrix magnesite rimmed by dolomite suggests pressures well into the coesite (if not diamond) stability field: something neglected in most studies. Despite the application of modern analytical and thermodynamic modelling tools, the peak conditions attained by Tso Morari ultrahigh-pressure rocks are often poorly deduced and at odds with simple observations. Is this problem perhaps hindering the reliable identification of new ultrahigh-pressure terranes?
The metamorphic evolution and tectonic significance of the Sumdo HP–UHP metamorphic terrane, central-south Lhasa Block, Tibet
Abstract The Lhasa terrane, forming one of the main tectonic components of the Himalayan–Tibetan orogen, has received a lot of attention as it records multiple episodes of plate spreading, subduction and collision within the realm of the Paleo-Tethys Ocean. A review of the mineralogical, petrological, geochemical and geochronological data of eclogites, associated blueschists and garnet-bearing mica schists from the Sumdo high- and ultrahigh-pressure metamorphic (HP/UHP) complex in the central/southern part of the Lhasa terrane, is present here so that the origin and tectono-metamorphic evolution of this important suture can be deduced. By re-evaluating the original published P – T conditions for the metamorphic rocks of the Sumdo Complex, we consider that the Sumdo Complex has experienced low temperature HP/UHP metamorphic conditions, characteristic of fast subduction (and exhumation) in a typical oceanic subduction zone setting. The original wide spread in the maximal peak P – T conditions could be reduced in size due to thus far unknown inconsistencies in the usage of applied geothermobarometric techniques. The remaining spread in the maximal P – T conditions ( c. 200°C/10 kbar) of the HP/UHP regions can be explained by a mechanism that the rocks from individual tectonic slices were subducted to different depths and followed by juxtaposition on their way back to the surface. A re-consideration of the isotopic ages of eclogites from the Sumdo Complex demonstrates that the opening of the Paleo-Tethys Ocean, located in between the two major components of the Lhasa terrane, was initiated prior to c. 280 Ma and the eclogite facies metamorphism is likely to be of late Permian ( c. 260 Ma) to early Triassic age (245–225 Ma), recording different ages of subduction from individual slices of the oceanic crust. The closure of the Paleo-Tethys Ocean resulted, no earlier than 210 Ma, in the final collision between the northern and southern Lhasa blocks. This final collision event may have been triggered by the initial subduction of the Bangong–Nujiang Tethys Ocean in the north.
Sodium amphibole in the post-glaucophane high-pressure domain: The role of eckermannite
In-situ infrared spectroscopic studies of hydroxyl in amphiboles at high pressure
Experimental study along the magnesio-hornblende–glaucophane join
Experimental and infrared characterization of the miscibility gap along the tremolite-glaucophane join
Synthesis and characterization of amphiboles along the tremolite–glaucophane join
The lower-pressure stability of glaucophane in the presence of paragonite and quartz in the system Na 2 O-MgO-Al 2 O 3 -SiO 2 -H 2 O
Multiple growth mechanisms of jadeite in Cuban metabasite
Ordovician blueschist metamorphism as a reflection of accretion-collision events in the Central Asian orogenic belt
The Synthesis and Stability of Some End-Member Amphiboles
An experimental investigation of the reaction: glaucophane + 2 quartz = 2 albite + talc
The role of water in the synthesis of glaucophane
Early Cretaceous lawsonite eclogites and related high-pressure rocks occur as tectonic inclusions within serpentinite mélange south of the Motagua fault zone, Guatemala. Petrologic and microtextural analyses of mafic high-pressure rocks reveal three metamorphic stages linked to several deformational textures. The prograde stage represents an incipient eclogitization and is preserved in prograde garnet, along with an older S 1 –S 2 foliation. The prograde assemblage is garnet ( X Mg = ∼0.22) + omphacite (∼52 mol% jadeite) or jadeite (∼83 mol % jadeite) + lawsonite + chlorite + rutile + quartz ± phengite (3.6 Si p.f.u.); some rocks also have ilmenite and rare ferro-glaucophane. Lawsonite in garnet of some lawsonite eclogites contains rare pumpellyite inclusions. The presence of synmetamorphic brittle deformation, inclusions of pumpellyite, Fe 2+ -Mg distribution coefficients between omphacite inclusions and adjacent garnet with Ln( K D ) = 2.7–4.5, and garnet-clinopyroxene-phengite thermobarometry suggest that eclogitization initiated at temperature ( T ) = ∼300 °C and pressure ( P ) > 1.1 GPa, and continued to T = ∼480 °C and P = ∼2.6 GPa. In contrast, the retrograde eclogite-facies assemblage is characterized by reversely zoned garnet rims and omphacite ± glaucophane + lawsonite + rutile + quartz ± phengite (3.5 Si p.f.u.) along the S 3 foliation. Garnet-phengite-clinopyroxene thermobarometry yields P = ∼1.8 GPa and T = ∼400 °C. The youngest, blueschist-facies assemblage (glauco-phane + lawsonite + chlorite + titanite + quartz ± phengite) locally replaces earlier mineral assemblages along S 4 crenulations. The inferred prograde P - T trajectory lies near a geotherm of ∼5 °C km −1 , comparable to the calculated thermal and petrologic structure of the NE Japan subduction zone. These petrologic characteristics indicate: (1) the basalt-eclogite transformation may occur at T = ∼300 °C in cold subduction zones, (2) glaucophane-bearing prograde assemblages are rare during incipient eclogitization in cold subduction zones, and (3) the chlorite-consuming reactions that form Fe-Mg-Mn garnet are more effective than the lawsonite-consuming reaction that forms a grossular component. At depths of ∼100 km in cold subduction zones, dehydration embrittlement may be caused by such chlorite-consuming reactions.