Subject:	Earth and Planetary Sciences
Specific subject area:	Marine geosciences; mantle geochemistry; oceanic lithosphere formation
Type of data:	Table Image Graph Figure
How the data were acquired:	Basaltic samples (n = 52) were collected by the French submersible ``Nautile'' during the “Parisub” cruise (2010, R/V L'Atalante, Ifremer) across the EPR axis (15°40′N) between 105°28′W and 105°13′W. Volcanic glass chips were carefully handpicked under a binocular microscope and successively cleaned ultrasonically in both ultra-pure water and ethanol. Following digestion, major and trace element concentrations were obtained via an ICP-AES Jovin Yvon Ultima 2 and an HR-ICP-MS Thermo Element II, respectively at the, Pôle Spectrométrie Océan (PSO), Institut Universitaire Européen de la Mer (IUEM) in Brest. Isotopic compositions were obtained from a single digestion (after HCl leaching) of 500–750 mg of sample material. Sr isotopic compositions were analyzed using a Thermo Triton TI-MS, whereas Hf, Nd, and Pb isotope compositions were analyzed using a Thermo Neptune MC-ICP-MS located at, PSO, Ifremer–Brest.
Data format:	Analyzed
Description of data collection:	Raw data were corrected from instrumental mass bias fractionation using exponential mass fractionation laws and the following values for Pb, Sr, Nd, and Hf, respectively: 205Tl/203Tl = 2.388; 88Sr/86Sr = 8.375202; 146Nd/144Nd = 0.7219; and 179Hf/177Hf = 0.7325. Measured values were compared with international standards globally used for standard bracketing: NIST981: 208Pb/204Pb = 36.7007, 207Pb/204Pb = 15.4891, 206Pb/204Pb = 16.9656; JMC475: 176Hf/177Hf = 0.282157; LAJOLLA: 143Nd/144Nd = 0.511858 and JNDI: 143Nd/144Nd = 0.512115; and NBS987: 87Sr/86Sr = 0.710248. Accuracy and precision were verified by repeated measurement of these standards during the period of analysis. The standard values obtained were as follows: NBS987 (n = 10): 86Sr/87Sr = 0.710263 ± 16 (2sd); JNDI (n = 27): 143Nd/144Nd = 0.512076 ± 32 (2sd); LAJOLLA (n = 11): 143Nd/144Nd = 0.511857 ± 18 (2sd); NIST981 (n = 23): 208Pb/204Pb = 36.6652 ± 250 (2sd), 207Pb/204Pb = 15.4810 ± 96
	(2sd), 206Pb/204Pb = 16.9283 ± 86 (2sd); JMC475 (n = 26): 176Hf/177Hf = 0.282148 ± 16 (2sd). Additional details are provided in the Experimental design, materials, and methods section.
Data source location:	· East Pacific Rise (15.6°N; -105.4°W) · Pacific Ocean * The coordinates of each of the 52 samples are reported in the data table
Data accessibility:	Data provided in this study are available online at EarthChem https://doi.org/10.26022/IEDA/112071, as well as they are already included in the PetDB database. Secondary data used for comparative purposes are indicated in the figure captions along with the corresponding references from which the data were extracted.
Related research article:	[1] Mougel, B., Agranier, A., Hemond, C., & Gente, P. (2021). High-resolution isotopic variability across EPR segment 16°N: A chronological interpretation of source composition and ridge-seamount interaction. Geochemistry, Geophysics, Geosystems, 22, e2021GC009781. https://doi.org/10.1029/2021GC009781