Exhumed mantle at Taww (NE, Oman Mountains)

Description

This data set contains supplementary information to the manuscript "Exhumed Mantle at the Birth of the Neo-Tethys Ocean: A Permian Magma-Poor Rifted Margin in the Sultanate of Oman", submitted to Tectonics in April 2026. Data include (i) a list of sample locations; (ii) geochemistry results; (iii) zircon U-Pb age results; (iv) Cathodoluminescence images of analyzed zircons; and (v) discrimination diagram for basalts and gabbros.

Steps to reproduce

(i) Sample location is based on field work (ii) Major and trace elements: Rock samples are cut to remove the weathered and altered part of the rock samples before the analyses. These fresh samples were then crushed and powdered to ~200 μm using an agate mortar. Whole-rock major element compositions were determined using an AXIOSMAX X-ray fluorescence (XRF) spectrometer. The detailed analytical procedure is explained in Li et al. (2014). About 0.6 g of powdered sample was mixed with ~6 g of Li₂B₄O₇ flux and fused to produce homogeneous glass discs for analysis. Whereas the trace and REE concentrations were obtained using an Agilent 7500a inductively coupled plasma mass spectrometer (ICP-MS) at the State Key Laboratory of Tibetan Plateau Earth System, Environment and Resources, Institute of Tibetan Plateau Research, Chinese Academy of Sciences. For this purpose, ~0.05 g of sample powder was dissolved in a mixture of HNO₃ and HF within sealed Teflon beakers at 190°C for 36 h prior to measurement. Standard GBW series were used for calibration of major element data. During trace element analysis, a Rh solution served as an internal standard to monitor instrumental drift, while international reference materials GBW were used for external calibration and drift correction. Analytical uncertainties are observed within 1% for major elements and 5% for trace and rare-earth elements. (iii) Zircon U-Pb geochronology Zircon grains were analyzed at Institute of Tibetan Plateau Research, Chinese Academy of Sciences (ITPCAS), Beijing, China. Protocol of analyzes is provided in the submitted manuscript. (iv) CL images Polished samples were scanned under a JSM-IT300 scanning electron microscope at Institute of Tibetan Plateau Research, Chinese Academy of Sciences (ITPCAS), Beijing, China for acquiring Cathodoluminescence images (CL). The CL images uncovered the internal structure of zircon grains and provide assistance in selecting the analytical spots for U–Pb geochronology.

Institutions

• Sultan Qaboos University

  Muscat, Muscat

Categories

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