Publication Date:
2023-07-10
Description:
As largest and best-exposed paleo-fast-spread oceanic crust on land, the Samail ophiolite in the Sultanate of Oman represents an ideal natural laboratory for investigating processes at fast-spreading mid-ocean ridges. We studied a layered gabbro sequence from the middle of the plutonic crust showing dm-scale modal layering with olivine abundance gradually decreasing from layer base to top (Wadi Somerah, Sumail block). Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) was performed in order to obtain trace element contents and rare earth elements (REE) in particular. Analyses were performed at the Institut für Geowissenschaften (Christian-Albrechts-Universität zu Kiel, Germany) using a 193 nm ArF excimer laser ablation system (GeoLasPro HD, Coherent) coupled to an Agilent 7900s ICP-MS. Analyses were performed as point measurements with 16 Hz pulse rate, 18 Jcm-2 fluence and a crater diameter of 120 µm on plagioclase, and 10 Hz, 12 Jcm-2 and a crater diameter of 32 µm on clinopyroxene. Differences in core and rim compositions of clinopyroxene reveal significant zonation with higher REE contents in the rim. Crystallization temperatures calculated using the REE-thermometer of Sun and Liang (2017; doi:10.1007/s00410-016-1326-9) vary between 1230 and 1300°C.
Keywords:
193 nm ArF excimer laser ablation system (GeoLasPro HD, Coherent) coupled to Agilent 7900s ICP-MS; Analysis; Calcium; calculated using the REE (rare earth element) thermometer of Sun and Liang (2017); Cerium; Crystallisation temperature; Crystallisation temperature, standard deviation; DEPTH, sediment/rock; Drilling/coring; Dysprosium; Erbium; Europium; Event layer type; Formation of Layered Gabbros; Gadolinium; Holmium; Lanthanum; Layer number; Lower Oceanic Crust; Lutetium; Minerals; Neodymium; Number of measurements; OM10-Sam; Oman; Oman Ophiolite; Promethium; Samarium; Sample code/label; Terbium; Thulium; Wadi Somerah, Sumail block; Ytterbium; Yttrium; Zirconium
Type:
Dataset
Format:
text/tab-separated-values, 600 data points
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