The Source of the Great Dyke, Zimbabwe, and Its Tectonic Significance: Evidence from Re‐Os Isotopes

  title={The Source of the Great Dyke, Zimbabwe, and Its Tectonic Significance: Evidence from Re‐Os Isotopes},
  author={Ronny Schoenberg and Thomas F. N{\"a}gler and Edwin Gnos and Jan D. Kramers and Balz S. Kamber},
  journal={The Journal of Geology},
  pages={565 - 578}
Re‐Os data for chromite separates from 10 massive chromitite seams sampled along the 550‐km length of the 2.58‐Ga Great Dyke layered igneous complex, Zimbabwe, record initial 187Os/188Os ratios in the relatively narrow range between 0.1106 and 0.1126. This range of initial 187Os/188Os values is only slightly higher than the value for the coeval primitive upper mantle (0.1107) as modeled from the Re‐Os evolution of chondrites and data of modern mantle melts and mantle derived xenoliths. Analyses… 

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