4.7 Article

A new cache of Eoarchaean detrital zircons from the Singhbhum craton, eastern India and constraints on early Earth geodynamics

期刊

GEOSCIENCE FRONTIERS
卷 10, 期 4, 页码 1359-1370

出版社

CHINA UNIV GEOSCIENCES, BEIJING
DOI: 10.1016/j.gsf.2019.02.001

关键词

U-Pb zircon ages; Hf isotopes; Singhbhum craton; Hadean; Eoarchean; Geodynamics

资金

  1. Ministry of Earth Sciences, New Delhi [1(245)/2014, MoES/P.O.(Geosci) 45/2015, GAP-738-28EVB]
  2. CSIR-NGRI projects [PSC0204]
  3. Australian Scientific Instruments and Geoscience Australia
  4. DAE-Raja Ramanna Fellowship

向作者/读者索取更多资源

The dominant geodynamic processes that underpin the formation and evolution of Earth's early crust remain enigmatic calling for new information from less studied ancient cratonic nuclei. Here, we present U-Pb ages and Hf isotopic compositions of detrital zircon grains from similar to 2.9 Ga old quartzites and magmatic zircon from a 3.505 Ga old dacite from the Iron Ore Group of the Singhbhum craton, eastern India. The detrital zircon grains range in age between 3.95 Ga and 2.91 Ga. Together with the recently reported Hadean, Eoarchean xenocrystic (up to 4.24 Ga) and modern detritus zircon grains from the Singhbhum craton, our results suggest that the Eoarchean detrital zircons represent crust generated by recycling of Hadean felsic crust formed at similar to 4.3-4.2 Ga and similar to 3.95 Ga. We observe a prominent shift in Hf isotope compositions at similar to 3.6-3.5 Ga towards super-chondritic values, which signify an increased role for depleted mantle and the relevance of plate tectonics. The Paleo-, Mesoarchean zircon Hf isotopic record in the craton indicates crust generation involving the role of both depleted and enriched mantle sources. We infer a short-lived suprasubduction setting around similar to 3.6-3.5 Ga followed by mantle plume activity during the Paleo-, Mesoarchean crust formation in the Singhbhum craton. The Singhbhum craton provides an additional repository for Earth's oldest materials. (C) 2019, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V.

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