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Ca-Mg isotopic decoupling in a Neoproterozoic alkaline province: tracing crustal recycling at the Yangtze Block margin
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DOI：10.1016/j.precamres.2026.108111.png)
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Abstract
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• The ∼ 870 Ma Pinghe alkaline complex exhibits a distinct decoupled Ca–Mg isotope signature. • Its elemental and Sr–Nd isotopic characteristics are consistent with those of global alkaline provinces. • Isotopic modeling indicates a magma source influenced by slab–derived, carbonate–rich hydrous melts. • The Micangshan province formed in a continental margin rift, not in an intraplate setting. • Combined Ca–Mg isotopes provide a robust tracer for carbonate recycling in mantle–derived magmas.
Keywords:
Ca–Mg isotopes
alkaline complex
slab-derived melts
carbonate recycling
Yangtze Block margin
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