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... 3 -Deep gabbro sills below the Moho (Fig. 5): The MTZ of the Oman ophiolite commonly includes a number of gabbros sills surrounded by dunites. The gabbros sills have millimeter-scale to tens of centimeter-scale modal layering that closely resembles layering in lower crustal gabbros of the ophiolite. These layered gabbros with wehrlite intrusions are thought to be in the ...
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... 3 -Deep gabbro sills below the Moho (Fig. 5): The MTZ of the Oman ophiolite commonly includes a number of gabbros sills surrounded by dunites. The gabbros sills have millimeter-scale to tens of centimeter-scale modal layering that closely resembles layering in lower crustal gabbros of the ophiolite. These layered gabbros with wehrlite intrusions are thought to be in the ...
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Citations
... Although interpreting some of the field observations and geochemical features in peridotites and associated chromitites adequately, these models do not provide a plausible explanation for the existence of diamonds and other UHP minerals in these ultramafic rock suites that clearly originated near the Transition Zone in the mantle. The IGCP649 project undertook systematic sampling of peridotites-chromitites in different ophiolites with diverse ranges of ages and geochemical affinities, such as ophiolite in China, Cyprus, Cuba, New Caledonia and Oman，to document the extent of diamond occurrence in the mantle (Yang et al., 2015b(Yang et al., , 2016(Yang et al., , 2017Yang and Shen, 2018;Niu et al., 2020). Using the newly discovered occurrence of natural diamonds and UHP minerals in ophiolitic peridotites and chromitites, and the geochemical compositions of these unusual minerals and their host rocks, we aimed to test some of the fundamental questions about mantle compositional heterogeneity, crust-mantle recycling, and petrogenetic evolution of the mantle lithosphere based on a global study of ophiolites-the only readily available samples of mantle rocks at the surface on Earth. ...
... In 2019, the IGCP 649 workshop was the last year of our IGCP 649 project, and it was successfully held on November, 12-22, 2019, in Muscat, Sultanate of Oman. The workshop consisted of a two-day conference and an eight-day post-conference field trip investigating the ophiolite and chromitites in Fanja-Al -Khodh-Somarah, Ibra and Maqsad area, southwest of Muscat, Wadi Al Jizzi volcanics, copper and chromite (Niu et al., 2020). mines in Sohar area, northern Oman, and chromitites, carbonatite and ultramafic lamprophyre in eastern Oman ophiolite. ...
... The classic ophiolite sequence is well exposed at the Semail ophiolite, showing a complete oceanic crustmantle section from residual peridotite, layered gabbro, sheeted dyke complex and effusive basaltic layer and sea sediments. The entire sequence at Semail is 12 km thick (Niu et al., 2020). In addition to holding workshops and field excursions, the IGCP-649 project has also organized many scientific sessions on ophiolites and chromitites in world wellknown international conferences, e.g., Goldschmidt Conference (2015,2017,2019), Annual Meeting of Geological Society of America (2015America ( , 2017, the International Geological Congress (2016, 2020 now postponed), and published several special issues of the journals, such as Gondwana Research (2015), Lithosphere (2018), Earth Sciences (2019), as well as abstract volumes (2015, 2016, 2017, 2018 and this volume) in the journal Acta Geologica Sinica. ...
Geotourism is a form of natural area tourism that focuses on geology and natural heritage of the land. Geoconservation and geological heritage are considered now as a new challenge for geological research which concentrate on the preservation of sites of geological value. Oman is considered by geologists and geotourists as an open geologic book and a big wonderful outdoor geological Museum with unique geological features. The country offers many geological features which are spectacular or unique. The geological stories can be found everywhere in Oman, where one can explore the fascinating geology in one of the most varied and diverse landscapes – from gravel to sand to salt, Oman has a landscape, outcrop, archaeological sites, local culture and fascinating human stories or formation to suit everyone. Therefore, the country attracts more and more geosciences students to study geology in the field, as well as tourists to enjoy the spectacular scenery. As a consequence, thereof geological heritage is in danger of being destroyed due to lack of awareness, and the need to protect unique geological sites and landscapes.KeywordsSustainabilityGeotourismSamail ophioliteOman
