Early Carboniferous metamorphism of the Neoproterozoic South Tien Shan-Karakum basement: New geochronological results from Baisun and Kyzylkum, Uzbekistan

D. Konopelko, Yu S. Biske, K. Kullerud, I. Ganiev, R. Seltmann, W. Brownscombe, R. Mirkamalov, B. Wang, I. Safonova, P. Kotler, V. Shatov, M. Sun, J. Wong

Research output

Abstract

Paleozoic evolution of the western Tien Shan, which is built up on the basement of the Karakum continent, is poorly constrained compared to the better investigated Tien Shan terranes along the margin of the Tarim Craton. We present magmatic, metamorphic and detrital zircon ages for the regionally metamorphosed Baisun block and the metasediments comprising the Karakum basement in the westernmost parts of the South Tien Shan terrane. Age spectra of detrital zircon from metasediments of the Baisun metamorphic block and the western South Tien Shan show remarkable similarities over the vast area extending for ca. 500 km and are characterized by major Neoproterozoic peak at 1200–600 Ma and smaller peaks at 2300–1700 and 2700–2400 Ma. The 570–540 Ma ages of the youngest grains define late Neoproterozoic (Ediacaran) – early Cambrian maximum depositional ages of the metasediments. Comparison of the obtained age spectra with those published for the adjacent Tien Shan terranes indicate that the detrital zircon grains in the studied Ediacaran sediments were derived from the southern Precambrian continents of Karakum and Tarim while transport from the Northern Tien Shan was limited. The age of the Barrovian metamorphism in the Baisun block is constrained by ages of anatectic granites in the range 352–340 Ma, corresponding to early Carboniferous. These ages well match the 340–330 Ma ages, established for the adjacent Lolabulak and Garm metamorphic blocks. Based on the regional distribution of suture zones we suggest that during the Carboniferous the relatively small tectonic blocks of the South Gissar comprised an archipelago, located between the larger continents of Karakum and Tarim and possibly connected with the Paleotethys Ocean. The archipelago scenario can explain hot and rapid metamorphic and tectonic processes, documented in the South Gissar, similar to the ongoing collision along the Australia – SE Asia junction.

Original languageEnglish
Pages (from-to)275-286
Number of pages12
JournalJournal of Asian Earth Sciences
Volume177
DOIs
Publication statusPublished - 15 Jun 2019

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metamorphism
metasediment
terrane
Ediacaran
zircon
archipelago
tectonics
suture zone
craton
Precambrian
Paleozoic
collision
ocean
sediment
continent

Scopus subject areas

  • Geology
  • Earth-Surface Processes

Cite this

Konopelko, D. ; Biske, Yu S. ; Kullerud, K. ; Ganiev, I. ; Seltmann, R. ; Brownscombe, W. ; Mirkamalov, R. ; Wang, B. ; Safonova, I. ; Kotler, P. ; Shatov, V. ; Sun, M. ; Wong, J. / Early Carboniferous metamorphism of the Neoproterozoic South Tien Shan-Karakum basement : New geochronological results from Baisun and Kyzylkum, Uzbekistan. In: Journal of Asian Earth Sciences. 2019 ; Vol. 177. pp. 275-286.
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abstract = "Paleozoic evolution of the western Tien Shan, which is built up on the basement of the Karakum continent, is poorly constrained compared to the better investigated Tien Shan terranes along the margin of the Tarim Craton. We present magmatic, metamorphic and detrital zircon ages for the regionally metamorphosed Baisun block and the metasediments comprising the Karakum basement in the westernmost parts of the South Tien Shan terrane. Age spectra of detrital zircon from metasediments of the Baisun metamorphic block and the western South Tien Shan show remarkable similarities over the vast area extending for ca. 500 km and are characterized by major Neoproterozoic peak at 1200–600 Ma and smaller peaks at 2300–1700 and 2700–2400 Ma. The 570–540 Ma ages of the youngest grains define late Neoproterozoic (Ediacaran) – early Cambrian maximum depositional ages of the metasediments. Comparison of the obtained age spectra with those published for the adjacent Tien Shan terranes indicate that the detrital zircon grains in the studied Ediacaran sediments were derived from the southern Precambrian continents of Karakum and Tarim while transport from the Northern Tien Shan was limited. The age of the Barrovian metamorphism in the Baisun block is constrained by ages of anatectic granites in the range 352–340 Ma, corresponding to early Carboniferous. These ages well match the 340–330 Ma ages, established for the adjacent Lolabulak and Garm metamorphic blocks. Based on the regional distribution of suture zones we suggest that during the Carboniferous the relatively small tectonic blocks of the South Gissar comprised an archipelago, located between the larger continents of Karakum and Tarim and possibly connected with the Paleotethys Ocean. The archipelago scenario can explain hot and rapid metamorphic and tectonic processes, documented in the South Gissar, similar to the ongoing collision along the Australia – SE Asia junction.",
keywords = "Baisun Block, Carboniferous metamorphism, Neoproterozoic basement, South Tien Shan (Tianshan), Uzbekistan, Zircon ages",
author = "D. Konopelko and Biske, {Yu S.} and K. Kullerud and I. Ganiev and R. Seltmann and W. Brownscombe and R. Mirkamalov and B. Wang and I. Safonova and P. Kotler and V. Shatov and M. Sun and J. Wong",
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Early Carboniferous metamorphism of the Neoproterozoic South Tien Shan-Karakum basement : New geochronological results from Baisun and Kyzylkum, Uzbekistan. / Konopelko, D.; Biske, Yu S.; Kullerud, K.; Ganiev, I.; Seltmann, R.; Brownscombe, W.; Mirkamalov, R.; Wang, B.; Safonova, I.; Kotler, P.; Shatov, V.; Sun, M.; Wong, J.

In: Journal of Asian Earth Sciences, Vol. 177, 15.06.2019, p. 275-286.

Research output

TY - JOUR

T1 - Early Carboniferous metamorphism of the Neoproterozoic South Tien Shan-Karakum basement

T2 - New geochronological results from Baisun and Kyzylkum, Uzbekistan

AU - Konopelko, D.

AU - Biske, Yu S.

AU - Kullerud, K.

AU - Ganiev, I.

AU - Seltmann, R.

AU - Brownscombe, W.

AU - Mirkamalov, R.

AU - Wang, B.

AU - Safonova, I.

AU - Kotler, P.

AU - Shatov, V.

AU - Sun, M.

AU - Wong, J.

PY - 2019/6/15

Y1 - 2019/6/15

N2 - Paleozoic evolution of the western Tien Shan, which is built up on the basement of the Karakum continent, is poorly constrained compared to the better investigated Tien Shan terranes along the margin of the Tarim Craton. We present magmatic, metamorphic and detrital zircon ages for the regionally metamorphosed Baisun block and the metasediments comprising the Karakum basement in the westernmost parts of the South Tien Shan terrane. Age spectra of detrital zircon from metasediments of the Baisun metamorphic block and the western South Tien Shan show remarkable similarities over the vast area extending for ca. 500 km and are characterized by major Neoproterozoic peak at 1200–600 Ma and smaller peaks at 2300–1700 and 2700–2400 Ma. The 570–540 Ma ages of the youngest grains define late Neoproterozoic (Ediacaran) – early Cambrian maximum depositional ages of the metasediments. Comparison of the obtained age spectra with those published for the adjacent Tien Shan terranes indicate that the detrital zircon grains in the studied Ediacaran sediments were derived from the southern Precambrian continents of Karakum and Tarim while transport from the Northern Tien Shan was limited. The age of the Barrovian metamorphism in the Baisun block is constrained by ages of anatectic granites in the range 352–340 Ma, corresponding to early Carboniferous. These ages well match the 340–330 Ma ages, established for the adjacent Lolabulak and Garm metamorphic blocks. Based on the regional distribution of suture zones we suggest that during the Carboniferous the relatively small tectonic blocks of the South Gissar comprised an archipelago, located between the larger continents of Karakum and Tarim and possibly connected with the Paleotethys Ocean. The archipelago scenario can explain hot and rapid metamorphic and tectonic processes, documented in the South Gissar, similar to the ongoing collision along the Australia – SE Asia junction.

AB - Paleozoic evolution of the western Tien Shan, which is built up on the basement of the Karakum continent, is poorly constrained compared to the better investigated Tien Shan terranes along the margin of the Tarim Craton. We present magmatic, metamorphic and detrital zircon ages for the regionally metamorphosed Baisun block and the metasediments comprising the Karakum basement in the westernmost parts of the South Tien Shan terrane. Age spectra of detrital zircon from metasediments of the Baisun metamorphic block and the western South Tien Shan show remarkable similarities over the vast area extending for ca. 500 km and are characterized by major Neoproterozoic peak at 1200–600 Ma and smaller peaks at 2300–1700 and 2700–2400 Ma. The 570–540 Ma ages of the youngest grains define late Neoproterozoic (Ediacaran) – early Cambrian maximum depositional ages of the metasediments. Comparison of the obtained age spectra with those published for the adjacent Tien Shan terranes indicate that the detrital zircon grains in the studied Ediacaran sediments were derived from the southern Precambrian continents of Karakum and Tarim while transport from the Northern Tien Shan was limited. The age of the Barrovian metamorphism in the Baisun block is constrained by ages of anatectic granites in the range 352–340 Ma, corresponding to early Carboniferous. These ages well match the 340–330 Ma ages, established for the adjacent Lolabulak and Garm metamorphic blocks. Based on the regional distribution of suture zones we suggest that during the Carboniferous the relatively small tectonic blocks of the South Gissar comprised an archipelago, located between the larger continents of Karakum and Tarim and possibly connected with the Paleotethys Ocean. The archipelago scenario can explain hot and rapid metamorphic and tectonic processes, documented in the South Gissar, similar to the ongoing collision along the Australia – SE Asia junction.

KW - Baisun Block

KW - Carboniferous metamorphism

KW - Neoproterozoic basement

KW - South Tien Shan (Tianshan)

KW - Uzbekistan

KW - Zircon ages

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U2 - 10.1016/j.jseaes.2019.03.025

DO - 10.1016/j.jseaes.2019.03.025

M3 - Article

AN - SCOPUS:85063902645

VL - 177

SP - 275

EP - 286

JO - Journal of Asian Earth Sciences

JF - Journal of Asian Earth Sciences

SN - 1367-9120

ER -