, Volume 154, Issue 1, pp 115-118
Date: 10 Feb 2007

Reply to Comment by F. Boudier and A. Nicolas on “Dating the geologic history of Oman’s Semail Ophiolite: insights from U–Pb geochronology” by C.J. Warren, R.R. Parrish, M.P. Searle and D.J. Waters

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We thank Boudier and Nicolas for renewing the long-standing discussion on the origin and emplacement of the Semail Ophiolite in Oman. The new U–Pb age data published by Warren et al. (2003, 2005), along with a wealth of previously published lithological, geochemical, structural and metamorphic data, allow the assessment of whether the Supra-Subduction Zone model or the Mid-Ocean Ridge model for ophiolite genesis and emplacement best fits the available reliable constraints.

The Mid-Ocean Ridge (MOR) model (e.g. Boudier and Coleman 1981; Boudier et al. 1988; Nicolas 1989) suggests that:

  1. The ophiolite originated at a Mid-Ocean Ridge.

  2. The detachment originated at or close to the spreading centre.

  3. The detachment was shallow-dipping, shown as only 10–15 km deep in its present position.

The Supra-Subduction (SSZ) model (e.g. Pearce et al. 1981; Searle and Malpas 1980, 1982; Searle and Cox 1999, 2002; Warren et al. 2003, 2005) alternatively suggests that:
  1. The ophiolite originated at a spread ...

Communicated by I. Parsons.