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May 9, 2023MineralsOpen Access

Zircon U–Pb Dating and Geochemical Characteristics of Chahannuo Gabbros in the Northern Margin of Qaidam Basin, Northern Tibetan Plateau

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Authors

WDWei DuLPLei PeiRLRuibao Li

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Overview

Geochemical analysis reveals a 255.0 Ma crystallization age in Chahannuo gabbros, indicating continental arc magmatism driven by northward Paleo-Tethyan subduction.

Key Points

  • To establish the crystallization age, petrogenesis, and tectonic setting of the Chahannuo gabbros in the northern margin of the Qaidam Basin.
  • Conducted petrological and whole-rock geochemical analyses of Chahannuo gabbro samples.
  • Performed laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) zircon U–Pb dating to determine crystallization timing.
  • LA-ICP-MS zircon U–Pb dating yielded a crystallization age of 255.0 ± 0.9 Ma, confirming late Permian Indosinian magmatic activity.
  • Gabbros showed calc-alkaline affinity with low SiO2 and Fe2O3, high Al2O3, elevated MgO, Cr, Ni, and high Mg#, accompanied by LREE/LILE enrichment and HREE/HFSE depletion.
  • Samples exhibited low Nb/La ratios, low Ti contents, no pronounced negative Eu anomalies, and elevated Rb/Sr, Th/Nd, and Th/La ratios, reflecting an enriched mantle source modified by slab fluids and minor crustal contamination.

Cite This Study

Du et al. (2023) studied this question.

synapsesocial.com/papers/6a8c2da97220baec05bbb708https://doi.org/10.3390/min13050651
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