Tarim and North China cratons linked to northern Gondwana through switching accretionary tectonics and collisional orogenesis

Yigui Han, Guochun Zhao, Peter A. Cawood, Min Sun, Paul R. Eizenhöfer, Wenzhu Hou, Xiaoran Zhang, Qian Liu

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Accretionary and collisional orogenesis in the Tarim and North China cratons during Paleozoic time can be correlated with events associated with the assembly and subsequent incipient dispersal of Gondwana. Zircon U-Pb and Hf isotopic data from the northern margins of the two cratons and neighbors have revealed comparable eHf(t)-time patterns. Zircons with magmatic ages of 500-400 Ma display a large spread and decreasing eHf(t) values with time, whereas 400-310 Ma zircons have dominantly positive eHf(t) values and an overall increasing trend. The marked shift of the zircon Hf array at ca. 400 Ma was most likely related to a major tectonic switch from advancing to retreating accretionary orogenesis, corresponding to the development of regional extension. The commencement of subduction at 500 Ma and establishment of an advancing accretionary orogen along the preexisting passive margin was synchronous with early Paleozoic continental collisional events along the southern margins of the two cratons. The temporal agreement of these events, and their accordance with collision and/or accretion events during Gondwana assembly, suggest that the Tarim and North China cratons likely collided with the northern Australia margin of East Gondwana at ca. 500 Ma. They subsequently dispersed from Gondwana in the Early Devonian, coinciding with switching accretionary tectonics along the northern margins of the two cratons that were possibly induced by the slab rollback of the subducting paleo- Asian Ocean plate.

Original languageEnglish
Pages (from-to)95-98
Number of pages4
JournalGeology
Volume44
Issue number2
DOIs
Publication statusPublished - 2016
Externally publishedYes

Keywords

  • Orogenic belt
  • Hf isotopic
  • Zircon

Cite this

Han, Yigui ; Zhao, Guochun ; Cawood, Peter A. ; Sun, Min ; Eizenhöfer, Paul R. ; Hou, Wenzhu ; Zhang, Xiaoran ; Liu, Qian. / Tarim and North China cratons linked to northern Gondwana through switching accretionary tectonics and collisional orogenesis. In: Geology. 2016 ; Vol. 44, No. 2. pp. 95-98.
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Tarim and North China cratons linked to northern Gondwana through switching accretionary tectonics and collisional orogenesis. / Han, Yigui; Zhao, Guochun; Cawood, Peter A.; Sun, Min; Eizenhöfer, Paul R.; Hou, Wenzhu; Zhang, Xiaoran; Liu, Qian.

In: Geology, Vol. 44, No. 2, 2016, p. 95-98.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - Tarim and North China cratons linked to northern Gondwana through switching accretionary tectonics and collisional orogenesis

AU - Han, Yigui

AU - Zhao, Guochun

AU - Cawood, Peter A.

AU - Sun, Min

AU - Eizenhöfer, Paul R.

AU - Hou, Wenzhu

AU - Zhang, Xiaoran

AU - Liu, Qian

PY - 2016

Y1 - 2016

N2 - Accretionary and collisional orogenesis in the Tarim and North China cratons during Paleozoic time can be correlated with events associated with the assembly and subsequent incipient dispersal of Gondwana. Zircon U-Pb and Hf isotopic data from the northern margins of the two cratons and neighbors have revealed comparable eHf(t)-time patterns. Zircons with magmatic ages of 500-400 Ma display a large spread and decreasing eHf(t) values with time, whereas 400-310 Ma zircons have dominantly positive eHf(t) values and an overall increasing trend. The marked shift of the zircon Hf array at ca. 400 Ma was most likely related to a major tectonic switch from advancing to retreating accretionary orogenesis, corresponding to the development of regional extension. The commencement of subduction at 500 Ma and establishment of an advancing accretionary orogen along the preexisting passive margin was synchronous with early Paleozoic continental collisional events along the southern margins of the two cratons. The temporal agreement of these events, and their accordance with collision and/or accretion events during Gondwana assembly, suggest that the Tarim and North China cratons likely collided with the northern Australia margin of East Gondwana at ca. 500 Ma. They subsequently dispersed from Gondwana in the Early Devonian, coinciding with switching accretionary tectonics along the northern margins of the two cratons that were possibly induced by the slab rollback of the subducting paleo- Asian Ocean plate.

AB - Accretionary and collisional orogenesis in the Tarim and North China cratons during Paleozoic time can be correlated with events associated with the assembly and subsequent incipient dispersal of Gondwana. Zircon U-Pb and Hf isotopic data from the northern margins of the two cratons and neighbors have revealed comparable eHf(t)-time patterns. Zircons with magmatic ages of 500-400 Ma display a large spread and decreasing eHf(t) values with time, whereas 400-310 Ma zircons have dominantly positive eHf(t) values and an overall increasing trend. The marked shift of the zircon Hf array at ca. 400 Ma was most likely related to a major tectonic switch from advancing to retreating accretionary orogenesis, corresponding to the development of regional extension. The commencement of subduction at 500 Ma and establishment of an advancing accretionary orogen along the preexisting passive margin was synchronous with early Paleozoic continental collisional events along the southern margins of the two cratons. The temporal agreement of these events, and their accordance with collision and/or accretion events during Gondwana assembly, suggest that the Tarim and North China cratons likely collided with the northern Australia margin of East Gondwana at ca. 500 Ma. They subsequently dispersed from Gondwana in the Early Devonian, coinciding with switching accretionary tectonics along the northern margins of the two cratons that were possibly induced by the slab rollback of the subducting paleo- Asian Ocean plate.

KW - Orogenic belt

KW - Hf isotopic

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