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

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ID: 296008
2019
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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.
Reference Key
openalex_W2928196453 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Hao Wu, Jingwen Chen, Qiang Wang, Yunpeng Yu
Journal american journal of science
Year 2019
DOI
10.2475/02.2019.02
URL
https://doi.org/10.2475/02.2019.02
Keywords Keywords not found

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