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Research ArticleArticles

Spatial and temporal variations in the geochemistry of Cretaceous high-Sr/Y rocks in Central Tibet

Hao Wu, Jingwen Chen, Qiang Wang and Yunpeng Yu
American Journal of Science February 2019, 319 (2) 105-121; DOI: https://doi.org/10.2475/02.2019.02
Hao Wu
* School of Earth Sciences and Engineering, Hohai University, 8 Fochengxi Street, Nanjing, 210098, China
** State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
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  • For correspondence: wuhaojlu@126.com
Jingwen Chen
*** Gold Geological Party of Chinese Armed Police Force, Mudanjiang 157000, China
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Qiang Wang
** State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
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Yunpeng Yu
§ College of Earth Sciences, Jilin University, Changchun, 130061, China
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Abstract

Recent studies based on low-temperature chronology and sedimentology have proposed the existence of a proto-Tibetan Plateau (p-TP); however, the timing and mechanisms of its formation and evolution remain ambiguous. High-Sr/Y rocks are an important petrological indicator of thickening. Here, we compile geochemical data of Cretaceous rocks to interpret their petrogenesis and to constrain deep geodynamic processes. Geochemical characteristics, in combination with zircon Hf isotopic compositions, indicate that the high-Sr/Y rocks were derived from the partial melting of thickened juvenile lower crust, with or without contamination by mantle peridotite. Comparing geochronological and geochemical data, we observe a correlation between magma migration and the composition of high-Sr/Y rocks. Based on these observations, we propose a revised tectonomagmatic evolution model for central Tibet, involving crustal thickening, retreating delamination, and breakoff. Our research suggests that the rapid uplift of the p-TP was a consequence of the removal of isostatic load during the Mesozoic.

  • Proto-Tibetan Plateau
  • high-Sr/Y rocks
  • crustal thickening
  • retreating delamination
  • breakoff
  • rapid surface uplift
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American Journal of Science: 319 (2)
American Journal of Science
Vol. 319, Issue 2
1 Feb 2019
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Spatial and temporal variations in the geochemistry of Cretaceous high-Sr/Y rocks in Central Tibet
Hao Wu, Jingwen Chen, Qiang Wang, Yunpeng Yu
American Journal of Science Feb 2019, 319 (2) 105-121; DOI: 10.2475/02.2019.02

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Spatial and temporal variations in the geochemistry of Cretaceous high-Sr/Y rocks in Central Tibet
Hao Wu, Jingwen Chen, Qiang Wang, Yunpeng Yu
American Journal of Science Feb 2019, 319 (2) 105-121; DOI: 10.2475/02.2019.02
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  • Article
    • Abstract
    • INTRODUCTION
    • GEOLOGICAL BACKGROUND AND TECTONIC SETTING
    • PETROGENESIS OF CRETACEOUS HIGH-Sr/Y ROCKS
    • SPATIAL AND TEMPORAL VARIATIONS IN THE GEOCHEMISTRY OF HIGH-Sr/Y ROCKS
    • INTEGRATED TECTONIC MODEL
    • CONCLUSIONS
    • ACKNOWLEDGMENTS
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Keywords

  • Proto-Tibetan Plateau
  • high-Sr/Y rocks
  • crustal thickening
  • retreating delamination
  • breakoff
  • rapid surface uplift

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