Light δD apatites reveal deep origin water in North China Craton intracontinental granites and basalts

Chuan-Mao Yang, Yi-Gang Xu (), Xiao-Ping Xia (), Jin-Hui Yang, Xiao-Long Huang, Christopher J. Spencer, Jin-Feng Sun and Qing Yang
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Chuan-Mao Yang: Chinese Academy of Sciences
Yi-Gang Xu: Chinese Academy of Sciences
Xiao-Ping Xia: Yangtze University
Jin-Hui Yang: Chinese Academy of Sciences
Xiao-Long Huang: Chinese Academy of Sciences
Christopher J. Spencer: Queen’s University
Jin-Feng Sun: University of the Chinese Academy of Sciences
Qing Yang: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Water is essential to the formation of intracontinental granites, but its origin remains elusive. Here we address this scientific problem by analyzing D/H isotopes of apatites, hydrous minerals in Jurassic and Early Cretaceous granites and basalts from eastern North China Craton, where water was previously interpreted as derived from subducting slab. Results reveal extremely low δD values in pristine Early Cretaceous granitic (−203‰ to −127‰) and basaltic (−197‰ to −107‰) apatites, contrasting with relatively high δD values (−137‰ to −47‰) in Jurassic granites. Given the depth-dependent D/H isotopic fractionation during slab dehydration and high-water contents in coeval primitive mafic magmas, the Early Cretaceous magma water is attributed to the stagnant slab within the mantle transition zone. Secular change in the depth of water aligns with steepening of subducting Paleo-Pacific plate from Jurassic to Early Cretaceous, demonstrating the potential of apatite H isotopes in tracing water origin in granites and basalts.

Date: 2024
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DOI: 10.1038/s41467-024-53133-4

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