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NARROW
GeoRef Subject
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Asia
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tellurides (1)
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Primary terms
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absolute age (8)
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Africa
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Southern Africa
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Karoo Basin (1)
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South Africa (2)
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Asia
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Central Asia
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Kazakhstan
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Aktyubinsk Kazakhstan (1)
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Far East
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China
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Japan
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Kurgan Russian Federation (1)
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biogeography (2)
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carbon
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Cenozoic
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Quaternary
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upper Pleistocene
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Chordata
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Vertebrata
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Iberian Peninsula
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Monograptina (1)
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Southern Urals
Typomorphic and Technological Characteristics of Quartz of the Mica-Pegmatite Formation on the Example of the Berkutinskaya Vein (South Urals)
Mineral Associations of Concentrates from Gold-Bearing Placers of the Miass Placer Zone (South Urals) and Possible Primary Sources of Gold
Geochemistry of Accessory Apatite from the Cu–Ni–Sulfide-Bearing Ultramafic–Mafic Rocks of the Khudolaz Complex (South Urals) as a Monitor of Magmatic and Metasomatic Processes
Zaykovite, Rh 3 Se 4 , a new mineral from the Kazan placer, South Urals, Russia
Tracing structural relicts of the ikaite-to-calcite transformation in cryogenic cave glendonite
Scroll-like and platy molybdenite-3 R from the Ufaley metamorphic block, South Urals: EBSD, XRD, SEM, EPMA and ICP-MS study
Crystal chemistry and origin of REE-bearing mukhinite from carbonate veins of the Svetlinsky gold deposit, South Urals, Russia
Five million years of high atmospheric CO 2 in the aftermath of the Permian-Triassic mass extinction
Neoproterozoic Deposits of the Bashkir Mega-Anticlinorium (Southern Urals): State of the Art in Regional Stratigraphy
Characterization and assessment of the potential toxicity/pathogenicity of Russian commercial chrysotile
Petrotectonic origin of mafic eclogites from the Maksyutov subduction complex, south Ural Mountains, Russia
ABSTRACT The Maksyutov complex is a mid- to late-Paleozoic high- to ultrahigh-pressure (HP-UHP) eclogite-bearing subduction zone terrane in the south Ural Mountains. Previous reports of radial fractures emanating from quartz inclusions in garnet, omphacite, and glaucophane, cuboid graphite pseudomorphs after matrix diamond, and microdiamond aggregates preserved in garnet identified by Raman spectroscopy indicate that parts of the complex were subjected to physical conditions of ~600 °C and >2.8 GPa for coesite-bearing rocks, and >3.2 GPa for diamond-bearing rocks. Peak UHP eclogite-facies metamorphism took place at ca. 385 Ma, and rocks were exhumed through retrograde blueschist-facies conditions by ca. 360 Ma. Bulk analyses of 18 rocks reflect the presence of mid-oceanic-ridge basalt (MORB), oceanic-island basalt (OIB), and island-arc tholeiite (IAT) basaltic and andesitic series plus their metasomatized equivalents. To more fully constrain the petrotectonic evolution of the complex, we computed isochemical phase equilibria models for representative metabasites in the system Na 2 O-CaO-K 2 O-FeO-MgO-Al 2 O 3 -SiO 2 -H 2 O-TiO 2 based on our new bulk-rock X-ray fluorescence (XRF) data. Both conventional Fe-Mg exchange thermometry and phase equilibrium modeling result in higher peak equilibrium temperatures than were previously reported for the complex. Pseudosection analysis provides minimum P-T conditions of 650–675 °C and 2.4–2.6 GPa for peak assemblages of the least retrogressed Maksyutov eclogites, whereas Fe-Mg exchange thermometry yields temperatures of 750 ± 25 °C for a pressure of 2.5 GPa. We interpret our new P-T data to reflect a thermal maximum reached by the eclogites on their initial decompression-exhumation stage, that defines a metamorphic field gradient; the relict coesite and microdiamond aggregates previously reported testify to pressure maxima that define an earlier prograde subduction zone gradient. The eclogitic Maksyutov complex marks underflow of the paleo-Asian oceanic plate and does not represent subduction of the Siberian cratonal margin.