40Ar/39Ar, U-Pb, and Sm-Nd constraints on the timing of metamorphic events in the Maksyutov Complex, southern Ural Mountains
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40Ar/39Ar, U-Pb, and Sm-Nd constraints on the timing of metamorphic events in the Maksyutov Complex, southern Ural Mountains. / Beane, R. J.; Connelly, J. N.
In: Journal of the Geological Society, Vol. 157, No. 4, 2000, p. 811-822.Research output: Contribution to journal › Journal article › Research › peer-review
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T1 - 40Ar/39Ar, U-Pb, and Sm-Nd constraints on the timing of metamorphic events in the Maksyutov Complex, southern Ural Mountains
AU - Beane, R. J.
AU - Connelly, J. N.
PY - 2000
Y1 - 2000
N2 - New 40Ar/ 39Ar, U-Pb, and Sm-Nd data from 13 metamorphic samples constrain the formation and exhumation of the high-pressure Maksyutov Complex in the southern Uralide orogen. The Maksyutov Complex records the highest-pressure metamorphism in the southern Uralides, and is part of the thrust stack that composes the footwall beneath the Main Ural Fault. The new isotopic data from eclogite in the Lower Unit of the Maksyutov Complex include 40Ar/ 39Ar data from phengite, U-Pb data from rutile and apatite and Sm-Nd data from garnet, clinopyroxene, rutile and apatite. These data indicate that eclogite-facies metamorphism occurred in the Mid-Devonian Epoch (c. 380 Ma), corresponding with eastward subduction of the East European craton beneath the Magnitogorsk island arc. After partial exhumation, the Lower unit was juxtaposed c. 360 Ma (based on 40Ar/ 39Ar white mica data) with the Middle and Upper units at mid-crustal levels during the development of a D 3 shear zone within the subduction zone. By the Late Carboniferous Epoch, the Maksyutov Complex was exhumed to upper-crustal levels, compatible with sedimentologic evidence that at this time the foreland thrust and fold belt began to form, and material was shed off it into the foreland basin.
AB - New 40Ar/ 39Ar, U-Pb, and Sm-Nd data from 13 metamorphic samples constrain the formation and exhumation of the high-pressure Maksyutov Complex in the southern Uralide orogen. The Maksyutov Complex records the highest-pressure metamorphism in the southern Uralides, and is part of the thrust stack that composes the footwall beneath the Main Ural Fault. The new isotopic data from eclogite in the Lower Unit of the Maksyutov Complex include 40Ar/ 39Ar data from phengite, U-Pb data from rutile and apatite and Sm-Nd data from garnet, clinopyroxene, rutile and apatite. These data indicate that eclogite-facies metamorphism occurred in the Mid-Devonian Epoch (c. 380 Ma), corresponding with eastward subduction of the East European craton beneath the Magnitogorsk island arc. After partial exhumation, the Lower unit was juxtaposed c. 360 Ma (based on 40Ar/ 39Ar white mica data) with the Middle and Upper units at mid-crustal levels during the development of a D 3 shear zone within the subduction zone. By the Late Carboniferous Epoch, the Maksyutov Complex was exhumed to upper-crustal levels, compatible with sedimentologic evidence that at this time the foreland thrust and fold belt began to form, and material was shed off it into the foreland basin.
KW - Ar/ Ar
KW - Eclogite
KW - Maksyutov
KW - U-Pb
KW - Ural Mountains
U2 - 10.1144/jgs.157.4.811
DO - 10.1144/jgs.157.4.811
M3 - Journal article
AN - SCOPUS:0033949830
VL - 157
SP - 811
EP - 822
JO - Journal of the Geological Society
JF - Journal of the Geological Society
SN - 0016-7649
IS - 4
ER -
ID: 334860852