Geology
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Item Dataset for "Anomalous 33S in the lunar mantle"(2023) Dottin III, James; Kim, Sang-Tae; Wing, Boswell; Farquhar, James; Shearer, CharlesThis item includes the sulfur isotope data reported in the journal article titled "Anomalous 33S in the lunar mantle" that is planned for publication in JGR: Planets.Item Isotopic Evidence for Multiple Recycled Sulfur Reservoirs in the Mangaia Mantle Plume(American Geophysical Union, 2020-10-06) Dottin, James Wosley III; Labidi, Jabrane; Jackson, Matthew G.; Woodhead, Jon; Farquhar, JamesMangaia, an ocean island in the Cook-Austral volcanic chain, is the type locality for the HIMU mantle reservoir and has also been shown to exhibit evidence for recycled sulfur with anomalous δ34S and Δ33S that has been attributed an Archean origin. Here we report bulk S-isotope data from sulfide inclusions in olivine and pyroxene phenocrysts from one of the previously analyzed and four additional Mangaia basalts to further test for the prevalence of anomalous S in the HIMU mantle source feeding Mangaia. We document compositions that range from −5.13‰ to +0.21‰ (±0.3 2σ), +0.006‰ to +0.049‰ (±0.016 2σ), −0.81‰ to +0.69‰ (±0.3 2σ) for δ34S, Δ33S, and Δ36S, respectively. These data extend the range of measured compositions and suggest S-isotope heterogeneity in the HIMU mantle source at Mangaia. We show that S-isotope compositions of bulk sulfide in olivine is not in isotopic equilibrium with bulk sulfide in pyroxene from the same samples and that samples from a confined area (M4, M10, M12, and M13) in the northern central part of the island show a distinct covariation for δ34S and Δ33S. This isotopic variation (forming an array) suggests mixing of sulfur from two sources that were captured at different stages of crystallization by phenocrysts in the Mangaia HIMU sulfur endmember.Item Data set for "Sulfur isotope evidence for a geochemical zonation of the Samoan mantle plume"(2021-03-28) Dottin III, James; Labidi, Jabrane; Jackson, Matthew; Farquhar, JamesThe contents of this file are new sulfur isotope data that were collected for the manuscript "Sulfur isotope evidence for a geochemical zonation of the Samoan mantle plume" that will be published in 'Geochemistry, Geophysics, Geosystems (G_Cubed)'.Item Data set for "Isotopic evidence for multiple recycled sulfur reservoirs in the Mangaia mantle plume"(ProQuest, 2020-07) Dottin III, James; Labidi, Jabrane; Jackson, Matthew; Woodhead, Jon; Farquhar, JamesIn compliance with AGU's journal, "Geochemistry, Geophysics, Geosystems" we have uploaded the data collected for our manuscript titled "Isotopic evidence for multiple recycled sulfur reservoirs in the Mangaia mantle plume".Item Evidence for oxidation at the base of the nakhlite pile by reduction of sulfate salts at the time of lava emplacement (Data set)(Geochimica et Cosmochimica Acta, 2018-08-02) Dottin, James III; Labidi, Jabrane; Piccoli, Philip; Farquhar, James; McKeegan, Kevin; Liu, Ming-ChangAttached are the data associated with the published manuscript "Evidence for oxidation at the base of the nakhlite pile by reduction of sulfate salts at the time of lava emplacement".Item Multiple sulfur isotopic composition of main group pallasites support genetic links to IIIAB iron meteorites (Data set)(Geochimica et Cosmochimica Acta, 2018-01-31) Dottin III, James; Farquhar, James; Labidi, Jabrane