Chinese Science Bulletin

, Volume 52, Issue 20, pp 2847–2853 | Cite as

In situ Re-Os isotope ages of sulfides in Hannuoba peridotitic xenoliths: Significance for the frequently-occurring mantle events beneath the North China Block

Articles Geochemistry
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Abstract

In situ Re-Os isotopes of sulfides in peridotitic xenoliths from Cenozoic Hannuoba basalts were analyzed by LAM-MC-ICPMS. The suifides developed two types of occurrences including silicate-enclosed and interstitial. In the enclosed sulfides, 187Os/188Os vary from 0.1124 to 0.1362 and 187Re/188Os from 0.0026 to 1.8027. In the interstitial ones, 187Os/188Os have a range from 0.1174 to 0.1354 and 187Re/188Os from 0.0365 to 1.4469. The oldest age, calculated by T RD for the enclosed sulfides, is 2.1 Ga. An isochron age of 2.3±1.2 Ga is obtained by five grains of enclosed sulfides and primitive mantle. The sulfides used have lower Re-Os isotopic ratio than primitive mantle. Meanwhile, an isochron age of 645±225 Ma is given by all interstitial sulfides and the enclosed sulfides with higher Re-Os isotopic ratio due to Re addition after mantle formation. In addition, the model age of 1.3 Ga recorded by one interstitial sulfide, having similar T DM and T RD, should be meaningful to deep thermal event. The coexistence of different ages, revealed by in situ Re-Os isotope, indicates frequently-occurring mantle events beneath Hannuoba area.

Keywords

In situ analysis Re-Os isotope peridotitic xenoliths lithospheric mantle Hannuoba 
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Copyright information

© Science in China Press 2007

Authors and Affiliations

  • Yu ChunMei 
    • 1
  • Zheng JianPing 
    • 1
    • 2
  • Griffin W. L. 
    • 3
  1. 1.Faculty of Earth SciencesChina University of GeosciencesWuhanChina
  2. 2.State Key Laboratory of Geological Processes and Mineral ResourceChina University of GeosciencesWuhanChina
  3. 3.GEMOC ARC National Key Center, Department of Earth and Planetary SciencesMacquarie UniversitySydneyAustralia

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