- 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
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
North Africa
-
Algeria
-
Ahaggar (3)
-
Kabylia (1)
-
-
-
-
Asia
-
Himalayas
-
Mount Everest (1)
-
-
Indian Peninsula
-
Nepal (1)
-
-
Main Central Thrust (1)
-
-
Europe
-
Southern Europe
-
Greece
-
Greek Aegean Islands
-
Cyclades (1)
-
-
-
Italy
-
Lombardy Italy (1)
-
Piemonte Italy (1)
-
Sesia-Lanzo Zone (1)
-
-
-
-
Mediterranean region
-
Aegean Islands
-
Greek Aegean Islands
-
Cyclades (1)
-
-
-
-
Mediterranean Sea
-
East Mediterranean
-
Aegean Sea (1)
-
-
-
South America
-
Peru (1)
-
-
-
elements, isotopes
-
metals
-
alkaline earth metals
-
magnesium (1)
-
-
-
-
geochronology methods
-
fission-track dating (1)
-
-
geologic age
-
Cenozoic
-
Tertiary (1)
-
-
Mesozoic
-
Cretaceous
-
Upper Cretaceous (1)
-
-
-
Paleozoic
-
Permian (1)
-
-
Precambrian
-
Archean (1)
-
upper Precambrian
-
Proterozoic (2)
-
-
-
-
igneous rocks
-
igneous rocks
-
carbonatites (1)
-
-
-
metamorphic rocks
-
metamorphic rocks
-
eclogite (2)
-
gneisses (3)
-
granulites
-
kinzigite (1)
-
-
metaigneous rocks
-
metabasite (1)
-
-
metasedimentary rocks
-
metapelite (3)
-
-
migmatites (1)
-
mylonites
-
blastomylonite (1)
-
-
schists
-
blueschist (1)
-
-
-
-
minerals
-
oxides
-
spinel (1)
-
-
phosphates
-
apatite (1)
-
-
silicates
-
chain silicates
-
aenigmatite group
-
sapphirine (1)
-
-
-
orthosilicates
-
nesosilicates
-
garnet group (2)
-
kyanite (1)
-
sillimanite (1)
-
staurolite (1)
-
-
-
ring silicates
-
cordierite (1)
-
milarite group
-
osumilite (1)
-
-
-
sheet silicates
-
mica group
-
biotite (1)
-
phengite (1)
-
-
-
-
-
Primary terms
-
Africa
-
North Africa
-
Algeria
-
Ahaggar (3)
-
Kabylia (1)
-
-
-
-
Asia
-
Himalayas
-
Mount Everest (1)
-
-
Indian Peninsula
-
Nepal (1)
-
-
Main Central Thrust (1)
-
-
Cenozoic
-
Tertiary (1)
-
-
crust (1)
-
Europe
-
Southern Europe
-
Greece
-
Greek Aegean Islands
-
Cyclades (1)
-
-
-
Italy
-
Lombardy Italy (1)
-
Piemonte Italy (1)
-
Sesia-Lanzo Zone (1)
-
-
-
-
faults (1)
-
folds (1)
-
geochronology (1)
-
igneous rocks
-
carbonatites (1)
-
-
inclusions
-
fluid inclusions (1)
-
-
intrusions (1)
-
Mediterranean region
-
Aegean Islands
-
Greek Aegean Islands
-
Cyclades (1)
-
-
-
-
Mediterranean Sea
-
East Mediterranean
-
Aegean Sea (1)
-
-
-
Mesozoic
-
Cretaceous
-
Upper Cretaceous (1)
-
-
-
metals
-
alkaline earth metals
-
magnesium (1)
-
-
-
metamorphic rocks
-
eclogite (2)
-
gneisses (3)
-
granulites
-
kinzigite (1)
-
-
metaigneous rocks
-
metabasite (1)
-
-
metasedimentary rocks
-
metapelite (3)
-
-
migmatites (1)
-
mylonites
-
blastomylonite (1)
-
-
schists
-
blueschist (1)
-
-
-
metamorphism (4)
-
orogeny (2)
-
Paleozoic
-
Permian (1)
-
-
paragenesis (2)
-
petrology (3)
-
phase equilibria (3)
-
plate tectonics (4)
-
Precambrian
-
Archean (1)
-
upper Precambrian
-
Proterozoic (2)
-
-
-
South America
-
Peru (1)
-
-
structural analysis (1)
-
structural geology (1)
-
tectonics (2)
-
tectonophysics (2)
-
Partial melting and P-T evolution of eclogite-facies metapelitic migmatites from the Egere terrane (Central Hoggar, South Algeria)
Abstract Central Hoggar, within the Tuareg shield to the east of the West African craton, is known for its complexity owing to the interplay of the Eburnean and Pan-African orogenies. The Tidjenouine area in the Laouni terrane belongs to the LATEA metacraton and displays spectacular examples of granulite-facies migmatitic metapelites. Here, we present a detailed petrological study coupled with in situ U–Pb zircon dating by laser-ablation inductively coupled plasma mass spectrometry (ICP-MS) that allows us to constrain the relative role of the Eburnean and Pan-African orogenies and hence to constrain how the LATEA Eburnean microcontinent has been partly destabilized during the Pan-African orogeny; that is, its metacratonic evolution. These metapelites have recorded different metamorphic stages. A clockwise P–T evolution is demonstrated on the basis of textural relationships, modelling in KFMASH and FMASH systems and thermobarometry. The prograde evolution implies several melting reactions involving the breakdown of biotite and gedrite. Peak metamorphic P–T conditions of 860±50 °C and 7–8 kbar (M 1 ) were followed by a decrease of pressure to 4.3±1 kbar and of temperature to around 700 °C, associated with the development of migmatites (M 2 ). After cooling, a third thermal phase at c . 650 °C and 3–4 kbar (M 3 ) occurred. U–Pb zircon laser ablation ICP-MS analysis allows us to date the protolith of the migmatites at 2151±8 Ma, the granulite-facies and migmatitic metamorphisms (M 1 –M 2 ) at 2062±39 Ma and the medium-grade metamorphic assemblage (M 3 ) at 614±11 Ma. This last event is coeval with the emplacement of large Pan-African granitic batholiths. These data show that the main metamorphic events are Eburnean in age. The Pan-African orogeny, in contrast, is associated mainly with medium-grade metamorphism but also mega-shear zones and granitic batholiths, characterized by a high temperature gradient. This can be considered as typical of a metacratonic evolution.