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. The Oman Drilling Project (OmanDP), performed under theInternational Continental Scientific Drilling Program (ICDP), is aninternational scientific research project that undertook drilling at a range of sites in the Semail ophiolite (Oman) to collect core samples spanning the stratigraphy of the ophiolite, from the upper oceanic crust down to the basal thrust. The cores were logged to International Ocean Discovery Program (IODP) standards aboard the D/V Chikyu. During ChikyuOman2018 Leg 3 (July–August 2018), participants described cores from the crust–mantle transition (CM) sites. The main rock types recovered at these sites weregabbros, dunites and harzburgites, rocks typically forming the base of theoceanic crust and the shallow mantle beneath present-day spreading centres.In addition to the core description, selected samples were analysed by X-ray fluorescence spectrometry (XRF) for their chemical compositions, including major, minor and some trace elements. To complement these standard procedures, we developed newapproaches to measure ultra-trace element concentrations using a procedureadapted from previous works to prepare fine-grained pressed powder pelletscoupled with laser ablation-inductively coupled plasma mass spectrometry (LA-ICP-MS) analysis using instrumentation aboard the D/V Chikyu. First, three (ultra)mafic reference materials were investigated to test and validate our procedure (BHVO-2, BIR-1a and JP-1), and then the procedure was applied to a selection of gabbro and dunite samples from the CM cores toexplore the limitations of the method in its current stage of development.The obtained results are in good agreement with preferred values for thereference materials and with subsequent solution replicate analyses of the same samples performed in shore-based laboratories following Leg 3 for theCM samples. We describe this procedure for the determination of 37 minor and (ultra-)trace elements (transition elements and Ga, Li and Large-Ion Lithophile Elements (LILE), Rare Earth Elements (REE), High-Field-Strength Elements (HFSE), U, Th, and Pb) in mafic and ultramafic rocks. The presented method has the major advantage that it allows the determination at sea of the(ultra-)trace element concentrations in a “dry”, safe way, without usingacid reagents. Our new approach could be extended for other elements ofinterest and/or be improved to be adapted to other rock materials duringfuture ocean drilling operations aboard the D/V Chikyu and other platforms.

scientific drilling

Ship-board determination of whole-rock (ultra-)trace element concentrations by laser ablation-inductively coupled plasma mass spectrometry analysis of pressed powder pellets aboard the D/V &amp;lt;i&amp;gt;Chikyu&amp;lt;/i&amp;gt;