Figure 8. Structural map of eastern Oman, depicting post-mid-Eocene
structures. Compiled after Béchennec et al. (1986), Villey et al.
(1986a, 1986b), Le Métour et al. (1986a, 1986b), Rabu et al. (1986),
Wyns et al. (1992), Roger et al. (1991), Peters et al. (2001, 2005),
Moraetis et al. (2018), Callegari et al. (2020) and Levell et al.
(2021). The age of the undifferentiated faults is unknown. The Harding
Strain Ellipse (Harding, 1974) indicates a wrench-fault assemblage
geometry for NW-striking sinistral slip. Note that most mapped
structures conform to this geometry!
4.4. U-Pb dating of carbonates
Synkinematic carbonates from faults were analyzed with the U-Pb in-situ
LA-ICPMS method (e.g., Woodhead & Petrus, 2019; Carminati et al., 2020;
Ring & Bolhar, 2020; Roberts et al., 2020). Out of five carbonate
samples only two synkinematic carbonates produced reliable and precise
U-Pb LA-ICPMS ages (sample Baz 2 and HAB 1). Analytical data are
presented in Figure 9 and reported in tables 3 and S2. Sample Baz 2 was
collected from a sinistral fault from the Sultan Qaboos University
Campus (site 7b) and yields an U-Pb age of 22.31 ±2.15 Ma (2 SE). Sample
HAB 1 consists of synkinematic calcite from a dextral fault of Halban
(site 2), yielding an U-Pb age of 30.08 ±0.47 Ma (2 SE).