Supplemental Material: Origin of low Mg# hawaiites carrying peridotite xenoliths from the Cima volcanic field, California, USA: Evidence of rapid magma mixing during ascent along intersecting fractures

Abstract

<p>Figure S1: Geologic maps of (a) Marl Mountain Quadrangle presented by Wilshire et al. (2002b) and (b). Figure S2: Peridotite mantle xenoliths found in Cima-4a and −4b, and DH-1. Figure S3: Histogram of Fo mol% ( = XMgO/(XMgO + XFeO) × 100) for Cima-4a. Figure S4: Representative BSE images of clinopyroxene phenocrysts from each textural category including (1) non-spongy/non-vermicular (2) spongy/vermicular and (3) oscillatory/sector-zoned. Figure S5: Histograms of clinopyroxene Mg# for five Cima hawaiites. Figure S6: Plots of Na2O, TiO2, and Cr2O3 (wt%) versus Mg# from analyzed clinopyroxene phenocrysts. Figure S7: Histograms of anorthite content (An mol% = XCaO/XCaO + XNa2O + XK2O) × 100) for three Cima basalts. Table S1: Standards employed for electron microprobe analyses of olivine, clinopyroxene, plagioclase, and Fe-Ti oxides. Table S2: Analyzed trace-element concentrations for all Cima samples. Table S3: Olivine phenocryst analyses for all Cima and Dish Hill samples. Table S4: (A) Clinopyroxene analyses for five Cima hawaiites. (B) Composition of the most Mg-rich clinopyroxene phenocryst. Table S5: (A) Microprobe analyses of ilmenite and titanomagnetite from six Cima hawaiites. (B) Fe-Ti oxide thermometry and oxybarometry (Ghiorso and Evans, 2008) results for all possible pairs of ilmenite and titanomagnetite. (C) Composition (wt%) of onset ilmenite and titanomagnetite pair that pass the Bacon and Hirschmann (1988) test for equilibrium. Table S6: (A) Plagioclase phenocryst analyses for three Cima hawaiites. (B) Analysis of most calcic plagioclase phenocryst. Table S7: Olivine-melt thermometry applied to all Cima and Dish Hill samples. </p>