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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Far East
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China
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South China Block (1)
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Middle East
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Iran
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Sanandaj-Sirjan Zone (3)
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Turkey
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Anatolia (1)
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Zagros (3)
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elements, isotopes
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isotope ratios (1)
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isotopes
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stable isotopes
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Hf-177/Hf-176 (1)
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metals
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hafnium
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Hf-177/Hf-176 (1)
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geochronology methods
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U/Pb (1)
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U/Th/Pb (1)
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geologic age
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Cenozoic
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Quaternary
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Holocene (1)
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Mesozoic
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Cretaceous
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Upper Cretaceous (1)
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Paleozoic (1)
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Precambrian
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Archean (1)
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upper Precambrian
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Proterozoic
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Neoproterozoic (1)
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igneous rocks
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igneous rocks
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plutonic rocks
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granites (1)
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metamorphic rocks
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metamorphic rocks
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gneisses
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orthogneiss (1)
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mylonites (1)
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schists (1)
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minerals
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silicates
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orthosilicates
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nesosilicates
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garnet group (1)
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zircon group
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zircon (2)
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sheet silicates
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mica group (1)
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Primary terms
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absolute age (2)
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Asia
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Far East
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China
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South China Block (1)
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Middle East
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Iran
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Sanandaj-Sirjan Zone (3)
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Turkey
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Anatolia (1)
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Zagros (3)
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Cenozoic
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Quaternary
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Holocene (1)
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crust (2)
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deformation (2)
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faults (3)
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folds (2)
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foliation (1)
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igneous rocks
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plutonic rocks
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granites (1)
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isotopes
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stable isotopes
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Hf-177/Hf-176 (1)
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-
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Mesozoic
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Cretaceous
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Upper Cretaceous (1)
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metals
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hafnium
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Hf-177/Hf-176 (1)
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metamorphic rocks
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gneisses
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orthogneiss (1)
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mylonites (1)
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schists (1)
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Mohorovicic discontinuity (1)
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paleogeography (1)
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Paleozoic (1)
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plate tectonics (3)
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Precambrian
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Archean (1)
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upper Precambrian
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Proterozoic
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Neoproterozoic (1)
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seismology (1)
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structural analysis (1)
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tectonics
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neotectonics (1)
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New detrital zircon U–Pb insights on the palaeogeographic origin of the central Sanandaj–Sirjan zone, Iran
Structural and kinematic analyses of the basement window within the hinterland fold-and-thrust belt of the Zagros orogen, Iran
Gondwanan Eoarchean–Neoproterozoic ancient crustal material in Iran and Turkey: zircon U–Pb–Hf isotopic evidence
Crustal-scale cross-sections across the NW Zagros belt: implications for the Arabian margin reconstruction
Exhumation of old rocks during the Zagros collision in the northwestern part of the Zagros Mountains, Iran
Arabia-Eurasia convergence is accommodated in the Zagros Mountains of southwestern Iran and in the seismic belts of the central Caspian, Alborz, and Kopeh Dagh of northern Iran. The Zagros is a NW-trending fold-and-thrust belt made up of a 6–15-km-thick sedimentary pile, which overlies the Precambrian metamorphic basement. During the Zagros orogeny, some of the Precambrian basement and Lower Paleozoic strata were exhumed from depth and are now exposed in the Golpayegan region in the northwestern part of the Zagros Mountains. The tectonic evolution of the Golpayegan region and the exhumation of the old rocks are interpreted as the product of three major sequential geotectonic events. (1) Major thrusts formed during shortening and exposure of the basement rocks in the Aligudarz block. The rock units are strongly imbricated and sheared, which suggest a high amount of cumulative shortening in the northern Zagros. (2) NE-SW–trending extensional faults (e.g., Eastern Mute, Western Mute, and Mahallat faults) formed during lateral extensional movement after middle Miocene time. In this event, a set of NE-SW–trending horsts and grabens was formed. In the horsts (e.g., Hassan-Robat, Mute, and Mahallat horsts), the Precambrian basement rocks and Lower Paleozoic strata are exposed. (3) Strike-slip movements began that remain active today. Strike-slip motions are well documented for the late Pliocene–Quaternary period. In the Golpayegan region, the Shazand and Dehagh faults cut through the NE-trending normal faults and through Quaternary deposits. Drainages are displaced by ~4 km of dextral movement along the Shazand fault and near the city of Golpayegan.