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Interplay between oceanic subduction and continental collision in building continental crust

Author

Listed:
  • Di-Cheng Zhu

    (China University of Geosciences)

  • Qing Wang

    (China University of Geosciences)

  • Roberto F. Weinberg

    (Monash University)

  • Peter A. Cawood

    (Monash University)

  • Sun-Lin Chung

    (National Taiwan University)

  • Yong-Fei Zheng

    (University of Science and Technology of China)

  • Zhidan Zhao

    (China University of Geosciences)

  • Zeng-Qian Hou

    (Chinese Academy of Geological Sciences)

  • Xuan-Xue Mo

    (China University of Geosciences)

Abstract

Generation of continental crust in collision zones reflect the interplay between oceanic subduction and continental collision. The Gangdese continental crust in southern Tibet developed during subduction of the Neo-Tethyan oceanic slab in the Mesozoic prior to reworking during the India-Asia collision in the Cenozoic. Here we show that continental arc magmatism started with fractional crystallization to form cumulates and associated medium-K calc-alkaline suites. This was followed by a period commencing at ~70 Ma dominated by remelting of pre-existing lower crust, producing more potassic compositions. The increased importance of remelting coincides with an acceleration in the convergence rate between India and Asia leading to higher basaltic flow into the Asian lithosphere, followed by convergence deceleration due to slab breakoff, enabling high heat flow and melting of the base of the arc. This two-stage process of accumulation and remelting leads to the chemical maturation of juvenile continental crust in collision zones, strengthening crustal stratification.

Suggested Citation

  • Di-Cheng Zhu & Qing Wang & Roberto F. Weinberg & Peter A. Cawood & Sun-Lin Chung & Yong-Fei Zheng & Zhidan Zhao & Zeng-Qian Hou & Xuan-Xue Mo, 2022. "Interplay between oceanic subduction and continental collision in building continental crust," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-34826-0
    DOI: 10.1038/s41467-022-34826-0
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    References listed on IDEAS

    as
    1. C. Brenhin Keller & Blair Schoene & Melanie Barboni & Kyle M. Samperton & Jon M. Husson, 2015. "Volcanic–plutonic parity and the differentiation of the continental crust," Nature, Nature, vol. 523(7560), pages 301-307, July.
    2. Gaochun Wang & Hans Thybo & Irina M. Artemieva, 2021. "No mafic layer in 80 km thick Tibetan crust," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    3. T. W. Sisson & S. Bronto, 1998. "Evidence for pressure-release melting beneath magmatic arcs from basalt at Galunggung, Indonesia," Nature, Nature, vol. 391(6670), pages 883-886, February.
    4. C. Brenhin Keller & Blair Schoene, 2012. "Statistical geochemistry reveals disruption in secular lithospheric evolution about 2.5 Gyr ago," Nature, Nature, vol. 485(7399), pages 490-493, May.
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