EMMR25 Mineralogy: Ol + opx + chlorite + cpx + amphibole + serpentine + opaque

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1 GSA Data Repository Marshall et al., 2017, The role of serpentinite derived fluids in metasomatism of the Colorado Plateau (USA) lithospheric mantle: Geology, Appendix DR1: Sample descriptions Samples that have an asterisk (e.g. EMMR7*) are samples that do not have thin sections. Phase assemblages in these samples were identified using crushed mineral separates, and are less reliable. Moses Rock Diatreme: Collected by Authors: EMMR4 Mineralogy: Serpentine + amphibole + chlorite + opaque Location: N, W EMMR7* Mineralogy: Ol + opx + cpx + Al spinel + chlorite Location: N, W EMMR25 Mineralogy: Ol + opx + chlorite + cpx + amphibole + serpentine + opaque Location: N, W Collected by Prof. Douglas Smith: MR ATG 13 (Sample collected by Anna T. Gavasci) Mineralogy: ol + opx + cpx + serpentine + Al spinel Location: N, W Green Knobs Diatreme: Collected by Authors: EMGN2

2 Mineralogy: Ol + opx + cpx + Al Spinel + serpentine EMGN7* Mineralogy: Ol + opx + cpx + chlorite + spinel EMGN9 Mineralogy: Ol + opx + chlorite + opaque + amphibole + serpentine EMGN10 Mineralogy: Ol + serpentine + amphibole + opx + chlorite + opaque EMGN13* Mineralogy: Ol + opx + chlorite + serpentine + amph? EMGN17 Mineralogy: Ol + opx + cpx + serpentine + chlorite EMGN21 Mineralogy: Ol + opx + chlorite + serpentine + opaque. EMGN23 Mineralogy: Ol + opx + chlorite + opaque + amphibole EMGN24 Mineralogy: Ol + opx + serpentine + amphibole + chlorite + opaques + clinohumite + carbonate EMGN27 Mineralogy: Ol + opx + serpentine + amphibole + carbonate + chlorite + cpx + opaques

3 EMGN33* Mineralogy: Ol + opx + chlorite + spinel Collected by Prof. Douglas Smith: N15 GN Mineralogy: Antigorite + olivine + carbonate + cpx + clinohumite + opaques Previous studies also using this sample: Smith, 1979; Smith, N16 GN Mineralogy: Ol + Al spinel + cpx + opx + serpentine Previous studies also using this sample: Smith and Levy, 1976; Roden et al., 1990; Roden and Shimizu, 1993; Smith, 2013; Behr and Smith, 2016; Marshall et al., N17 GN Mineralogy: Ol + opx + cpx + chlorite + serpentine + amphibole + opaque + magnesite Previous studies also using this sample: Smith and Levy, 1976; Smith, 1979; Roden and Shimizu, 1993; Smith, 2013; Behr and Smith, 2016; Marshall et al., N23 GN Mineralogy: Ol + opx + chlorite + cpx + amphibole + clinohumite + opaque + magnesite + antigorite Previous studies also using this sample: Smith, 1979; Roden et al., 1990; Roden and Shimizu, 1993; Smith, 2013; Behr and Smith, 2016; Marshall et al., N51 GN Mineralogy: Ol + Antigorite + chlorite + carbonate + opx + cpx + clinohumite N55 GN Mineralogy: Ol + opx + cpx + sp + amph + serpentine + garnet + chlorite Previous studies also using this sample: Smith and Levy, 1976; Smith, 1979; Marshall et al., N57 GN Mineralogy: Ol + opx + chlorite + serpentine + amphibole + cpx + carbonate Previous studies also using this sample: Smith, 1979.

4 N61 GN Mineralogy: Ol + opx + cpx + Al spinel +amph Previous studies also using this sample: Smith and Levy, 1976; Roden et al., 1990; Roden and Shimizu, 1993; Marshall et al., N71 GN Mineralogy: Ol + opx + chlorite + amphibole + serpentine + cpx + carbonate + opaque Previous studies also using this sample: Smith, 1979; Roden et al., 1990; Roden and Shimizu, N106 GN Mineralogy: Ol + opx + cpx + chlorite + amphibole + opaques + spinel + garnet + antigorite Previous studies also using this sample: Behr and Smith, 2016; Marshall et al., N126 GN Mineralogy: Ol + opx + cpx + Al spinel + serpentine Previous studies also using this sample: Smith, 1977; Marshall et al., N143 GN Mineralogy: Ol + serpentine + opx + cpx + carbonate + chlorite N178 GN Mineralogy: Ol + opx + cpx + chlorite + Cr spinel + phlogopite (trace) Previous studies also using this sample: Smith, 2010; Smith, 2013; Behr and Smith, 2016; Marshall et al., N182 GN* Mineralogy: Ol + serpentine + chlorite + opx N234 GN* Mineralogy: Serpentine N363 GN* Mineralogy: Serpentine + carbonate

5 References Behr, W.M., and Smith, D., 2016, Deformation in the mantle wedge associated with Laramide flatslab subduction: Geochemistry Geophysics Geosystems, v. 17, p Marshall, E.W., Lassiter, J.C., Barnes, J.D., Luguet, A., and Lissner, M., 2017, Mantle melt production during the 1.4 Ga Laurentian magmatic event: Isotopic constraints from Colorado Plateau mantle xenoliths: Geology, v. 45, no. 6, p. G Roden, M., and Shimizu, N., 1993, Ion microprobe analyses bearing on the composition of the upper mantle beneath the Basin and Range and Colorado Plateau provinces: Journal of Geological Research, v. 98, no. 93, p Roden, M., Smith, D., and Murthy, V., 1990, Chemical constraints on lithosphere composition and evolution beneath the Colorado Plateau: Journal of Geophysical Research, v. 95, no. 89, p Smith, D., 2010, Antigorite Peridotite, Metaserpentinite, and other Inclusions within Diatremes on the Colorado Plateau, SW USA: Implications for the Mantle Wedge during Low angle Subduction: Journal of Petrology, v. 51, no. 6, p Smith, D., 1979, Hydrous minerals and carbonates in peridotite inclusions from the green knobs and bull park kimberlitic diatremes on the Colorado Plateau: The Mantle Sample: Inclusion in Kimberlites and Other Volcanics, v. 16, p Smith, D., 2013, Olivine thermometry and source constraints for mantle fragments in the Navajo Volcanic Field, Colorado Plateau, southwest United States: Implications for the mantle wedge: Geochemistry, Geophysics, Geosystems, v. 14, no. 3, p Smith, D., 1977, The Origin and Interpretation of Spinel Pyroxene Clusters in Peridotite: v. 85, no. 4, p Smith, D., and Levy, S., 1976, Petrology of the Green Knobs diatreme and implications for the upper mantle below the Colorado Plateau: Earth and Planetary Science Letters, v. 29, p

6 Figure DR1: Plot of Sm/Nd in clinopyroxene versus Sm Nd DMM model age in clinopyroxene. Lower Sm/Nd ratios represents more metasomatised samples. As samples become more metasomatised, they have a younger DMM model age. This trend suggests recent metasomatism, most likely related to Farallon subduction.

7 Figure DR2: Clinopyroxene Yb concentration versus olivine oxygen isotope composition. Lower Yb concentration represents increasing melt depletion.

8 Figure DR3: Dry whole rock Al 2 O 3 concentration (normalized without LOI) versus olivine oxygen isotope composition. Increasing melt depletion lowers the whole rock Al 2 O 3 concentration.

9 Figure DR4: Whole rock Loss on Ignition (LOI) versus olivine oxygen isotope composition. Higher LOI represents more abundant hydrous minerals in a sample.

10 Table DR1: Whole Rock major and trace elements EMGN23 SiO TiO Al2O Cr2O FeO 6.87 MnO 0.11 MgO CaO 1.05 Na2O 0.01 K2O 0.00 NiO 0.30 P2O LOI 4.57 Total La 0.04 Ce 0.05 Pr 0.01 Nd 0.02 Sm 0.01 Eu 0.00 Gd 0.01 Tb 0.00 Dy 0.02 Ho 0.00 Er 0.02 Tm 0.00 Yb 0.04 Lu 0.01 Rb 0.12 Pb 0.15 Th 0.01 U 0.00 Nb 0.02 Sr Zr 0.27 Hf 0.00 Y 0.17 Sc 7.72 V The other sample whole rock data, as well as the whole rock analytical methods are reported in Marshall et al., 2017

11 Table DR2: Clinopyroxene trace element data EMGN23 EMGN7 EMMR7 Average 2σ Average 2σ Average 2σ Group D Group E Group D n = 3 n = 9 n = 8 La 0.08 (0.04) 0.05 (0.02) 0.05 (0.01) Ce 0.23 (0.05) 0.08 (0.01) 0.07 (0.03) Pr 0.04 (0.01) 0.01 (0.00) 0.01 (0.00) Nd 0.24 (0.05) 0.03 (0.01) 0.05 (0.01) Sm 0.10 (0.01) 0.01 (0.01) 0.10 (0.02) Eu 0.05 (0.01) 0.01 (0.00) 0.07 (0.02) Gd 0.20 (0.05) 0.02 (0.01) 0.39 (0.06) Dy 0.45 (0.01) 0.09 (0.01) 0.96 (0.10) Er 0.46 (0.06) 0.16 (0.02) 0.80 (0.10) Yb 0.56 (0.08) 0.29 (0.04) 0.92 (0.09) Lu 0.09 (0.01) 0.05 (0.01) 0.13 (0.01) Rb 0.02 (0.05) bd bd Th 0.01 (0.01) bd bd U bd bd bd Nb 0.02 (0.02) 0.01 (0.01) 0.01 (0.01) Ta 0.00 (0.00) bd bd Pb 0.04 (0.03) bd bd Sr 7.51 (6.45) 2.53 (2.06) 0.94 (0.84) Zr 0.53 (0.09) 0.04 (0.02) 0.05 (0.01) Hf 0.01 (0.00) bd 0.02 (0.00) Y 3.42 (0.25) 1.04 (0.07) 6.43 (0.52) V 190 (6.71) bd: below detection The other sample clinopyroxene data, as well as the whole rock analytical methods are reported in Marshall et al., 2017

12 Table DR3: Olivine oxygen isotope data δ18o Duplicates ( ) Average δ18o 1 s.d. MR-ATG-13 Group D N126-GN Group D N16-GN Group D N61-GN Group D N106-GN Group D EMGN24 Group D N23-GN Group D EMGN23 Group D EMGN2 Group T N17-GN Group T EMMR7 Group T N55-GN Group E EMGN21 Group E EMGN27 Group E EMGN7 Group E All values are reported relative to SMOW

13 Table DR4: Hydrous mineral hydrogen isotope compositions δd Duplicates ( ) Sample Mineral δd value ( ) 1 s.d. EMGN10 Serpentine EMGN13 Chlorite EMGN17 Chlorite EMGN21 Chlorite EMGN23 Chlorite EMGN27 Chlorite EMGN33 Chlorite EMGN7 Chlorite EMGN9 Chlorite EMMR25 Chlorite EMMR4 Chlorite N106-GN Chlorite N143-GN Serpentine N15-GN Serpentine N178-GN Chlorite N182-GN Serpentine N23-GN Chlorite N234-GN Serpentine N363-GN Serpentine N51-GN Serpentine N57-GN Serpentine N71-GN Chlorite All δd values relative to SMOW

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