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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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North Africa
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Morocco
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Rif
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Beni Bouchera (1)
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Asia
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Altai-Sayan region (1)
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Far East
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China
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Xinjiang China
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Junggar (1)
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Mongolia (3)
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Krasnoyarsk Russian Federation
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Taymyr Dolgan-Nenets Russian Federation
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Norilsk region (1)
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Sayan (1)
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Siberian Platform (1)
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Tuva Russian Federation
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Sangilen Mountains (1)
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Caledonides (1)
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Commonwealth of Independent States
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Russian Federation
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Chelyabinsk Russian Federation
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Ilmen Mountains (1)
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Krasnoyarsk Russian Federation
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Taymyr Dolgan-Nenets Russian Federation
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Norilsk region (1)
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Murmansk Russian Federation
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Kola Peninsula (1)
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Siberian Platform (1)
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Tuva Russian Federation
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Sangilen Mountains (1)
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Urals
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Southern Urals
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Europe
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Murmansk Russian Federation
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Kola Peninsula (1)
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Southern Europe
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Iberian Peninsula
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Spain
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Betic Cordillera (1)
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South America
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Brazil
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Mato Grosso Brazil (1)
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elements, isotopes
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isotope ratios (5)
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isotopes
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radioactive isotopes
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
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stable isotopes
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Hf-177/Hf-176 (5)
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Nd-144/Nd-143 (4)
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
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Sr-87/Sr-86 (4)
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Lu/Hf (2)
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metals
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alkaline earth metals
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strontium
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Sr-87/Sr-86 (4)
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hafnium
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Hf-177/Hf-176 (5)
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lead
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
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manganese (1)
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rare earths
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neodymium
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Nd-144/Nd-143 (4)
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geochronology methods
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Ar/Ar (2)
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Lu/Hf (2)
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Rb/Sr (1)
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Sm/Nd (1)
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U/Pb (8)
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geologic age
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Cenozoic
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Tertiary
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Neogene
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Miocene
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lower Miocene (1)
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Mesozoic
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igneous rocks
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carbonatites (1)
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feldspathoid rocks (1)
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kimberlite (1)
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plagiogranite (4)
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ultramafics
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volcanic rocks
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wehrlite (1)
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metamorphic rocks
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minerals
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silicates
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orthosilicates
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nesosilicates
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zircon group
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zircon (9)
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sheet silicates
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mica group
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biotite (1)
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wehrlite (1)
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Primary terms
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absolute age (10)
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Africa
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North Africa
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Morocco
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Rif
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Beni Bouchera (1)
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-
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-
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Asia
-
Altai-Sayan region (1)
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Far East
-
China
-
Xinjiang China
-
Junggar (1)
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-
-
Mongolia (3)
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-
Krasnoyarsk Russian Federation
-
Taymyr Dolgan-Nenets Russian Federation
-
Norilsk region (1)
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-
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Sayan (1)
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Siberian Platform (1)
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Tuva Russian Federation
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Sangilen Mountains (1)
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-
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Cenozoic
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Tertiary
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Neogene
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Miocene
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lower Miocene (1)
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crust (2)
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Europe
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Fennoscandian Shield (1)
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Murmansk Russian Federation
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Kola Peninsula (1)
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Southern Europe
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Iberian Peninsula
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Spain
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Betic Cordillera (1)
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-
-
geochemistry (1)
-
igneous rocks
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carbonatites (1)
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feldspathoid rocks (1)
-
kimberlite (1)
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plutonic rocks
-
diorites
-
plagiogranite (4)
-
quartz diorites (1)
-
tonalite (2)
-
-
gabbros
-
olivine gabbro (1)
-
troctolite (1)
-
-
granites
-
leucogranite (1)
-
-
lamprophyres
-
camptonite (1)
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-
syenites
-
alkali syenites (1)
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nepheline syenite (1)
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-
ultramafics
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peridotites
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dunite (1)
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volcanic rocks
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basalts
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alkali basalts (1)
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inclusions (1)
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intrusions (7)
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isotopes
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radioactive isotopes
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
-
-
stable isotopes
-
Hf-177/Hf-176 (5)
-
Nd-144/Nd-143 (4)
-
Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
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Sr-87/Sr-86 (4)
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magmas (5)
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mantle (3)
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Mesozoic
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Cretaceous
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Upper Cretaceous (1)
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-
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metals
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alkaline earth metals
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strontium
-
Sr-87/Sr-86 (4)
-
-
-
hafnium
-
Hf-177/Hf-176 (5)
-
-
lead
-
Pb-206/Pb-204 (1)
-
Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
-
-
manganese (1)
-
rare earths
-
neodymium
-
Nd-144/Nd-143 (4)
-
-
-
-
metamorphic rocks
-
eclogite (1)
-
gneisses (1)
-
granulites (1)
-
metaigneous rocks
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metabasite (1)
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metagabbro (1)
-
-
metasedimentary rocks
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metapelite (1)
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-
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metamorphism (2)
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Paleozoic
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Cambrian (3)
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Carboniferous
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Lower Carboniferous (1)
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lower Paleozoic (2)
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Ordovician
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Upper Ordovician (1)
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Permian
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Middle Permian (1)
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paragenesis (1)
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phase equilibria (1)
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plate tectonics (5)
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Precambrian
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Archean
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Mesoarchean (1)
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upper Precambrian
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Proterozoic
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Neoproterozoic
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Ediacaran (1)
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Vendian (1)
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Paleoproterozoic (1)
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-
-
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South America
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Brazil
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Mato Grosso Brazil (1)
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-
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tectonics (1)
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Intrusive Complexes of the Late Neoproterozoic Island Arc Structure of the Lake Zone (Mongolia): Isotope Systematics and Sources of Melts
Rapid transition from oceanic subduction to postcollisional extension revealed by Carboniferous magmatism in East Junggar (NW China), southwestern Central Asian orogenic belt
Lu–Hf Isotope Composition of Zircon and Magma Sources of the Vendian–Early Paleozoic Granitoids in Tuva (by the Example of the Kaa-Khem and East Tannu-Ola Batholiths)
Geochemistry, Sm–Nd, Rb–Sr, and Lu–Hf Isotopes, Sources, and Conditions of Formation of Early Paleozoic Plagiogranitoids in the South of the Lake Zone in Western Mongolia
Composition and Age of Plagiogranitoids in the South of the Lake Zone (Western Mongolia)
In situ U-Pb zircon geochronology on metapelitic granulites of Beni Bousera (Betic-Rif system, N Morocco)
ABSTRACT Integration of geochronological analyses of in situ zircons with the petrological study of their microstructural growth microdomains (through petrography and phase diagram modeling) yields a more precise interpretation and understanding of any geological process than the study of ages from separate zircons. This is essential especially for those rocks affected by polymetamorphic histories. We present new in situ U-Pb zircon dating from metapelitic granulites exposed in the contact with the ultramafic massif of Beni Bousera (northern Morocco, Western Mediterranean). Geochronological data scatter from Paleoproterozoic (1508 ± 23 Ma) to Miocene (22.9 ± 0.7 Ma), though the majority of ages range between 100 and 400 Ma, with four main peak ages clustering around 390–319, 286–264, 193, and 105 Ma. The Middle Permian (ca. 286–264 Ma) and earliest Miocene (22.9 ± 0.7 Ma) ages are constrained from a thermobarometric point of view: The former ages represent the formation of the zircons at depth (higher pressure), and the latter ages represent the exhumation process (lower pressure). Combining these petrological results with previous geophysical and geodynamical studies from the literature in the area, we propose a four-step geodynamic model for the Beni Bousera orogenic peridotite since the end of the Paleozoic (i.e., Middle Permian) to the present, supporting an evolution linked to a subduction-related scenario since Late Cretaceous times.