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grains and contains small clinopyroxene and completely altered olivine grains in similar proportions along its margins (130-807C-93R-1-137-139; Unit 4G; 1525.8 mbsf; [82]; Figs. 2.3e,f). Major and minor element data only are reported in Ta- ble 2.1 for selected points sampled along a transect from the core area to the rim of a single large xenolith crystal (Fig. 2.6e). 53
54 Crystal Zone 5 ML-X1 xenolith TABLE 2.2 CALCULATED PARTITION COEFFICIENTS <strong>AND</strong> EQUILIBRIUM LIQUID COMPOSITIONS An D Sr D Ti D Y D Ba D La D Ce D Nd D Eu D Mg D Fe Sr Ti Y Ba La Ce Nd Eu Mg# 6 Ba/Sr La/Y Sr/Ti Interior 85 1.26 0.04 0.03 0.1 0.17 0.11 0.12 0.43 0.047 0.065 136.8 3331 8 22.08 1.41 5.52 - 0.58 0.3 0.16 0.18 0.04 Interior 85 1.24 0.04 0.03 0.1 0.17 0.1 0.11 0.43 0.047 0.065 130.5 1991 7.05 29.68 0.99 2.37 3.3 0.78 0.31 0.23 0.14 0.07 Interior 85 1.24 0.04 0.03 0.1 0.17 0.11 0.11 0.43 0.047 0.065 142.1 3664 7.51 18.91 1.19 3.49 3.39 0.81 0.32 0.13 0.16 0.04 Interior 86 1.23 0.04 0.03 0.1 0.17 0.1 0.11 0.43 0.047 0.065 152.3 2036 5.15 21.85 1.52 3.49 6.71 0.97 0.31 0.14 0.26 0.07 Interior 84 1.28 0.04 0.03 0.11 0.17 0.11 0.12 0.43 0.047 0.065 135 2147 - 27.01 2.32 3.4 3.29 1.1 0.33 0.2 - 0.06 Interior 86 1.21 0.04 0.02 0.1 0.17 0.1 0.11 0.43 0.047 0.065 153.6 4392 17.51 32.31 1.81 5.25 2.03 - 0.31 0.21 0.1 0.03 59R2-X1 xenolith Exterior 66 1.99 0.06 0.06 0.24 0.2 0.14 0.16 0.43 0.047 0.065 - 2998 - - - - - - 0.18 - - - Exterior 75 1.61 0.05 0.04 0.16 0.19 0.12 0.14 0.43 0.047 0.065 140.6 9313 4.76 30.42 2.33 5.26 3.6 1.13 0.32 0.22 0.49 0.02 Interior 81 1.39 0.04 0.03 0.13 0.18 0.11 0.12 0.43 0.047 0.065 - 5985 - - - - - - 0.3 - - - continued...
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TEXTURAL AND MICROANALYSIS OF IGNEO
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TEXTURAL AND MICROANALYSIS OF IGNEO
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DEDICATION This work is dedicated t
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CHAPTER 2: MAGMA EVOLUTION REVEALED
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3.6.3.1 Crystal Population Origins
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FIGURES 1.1 Magma Chambers . . . .
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TABLES 2.1 MAJOR AND TRACE ELEMENT
Page 15 and 16: thus been debate within the volcano
Page 17 and 18: Cambrian schist) including a crysta
Page 19 and 20: explosive eruption vs. mild effusiv
Page 21 and 22: tiation (e.g., [84, 98]; Fig. 1.3).
Page 23 and 24: defined as having crystallinities b
Page 25 and 26: 12 Figure 1.4: Large Igneous Provin
Page 27 and 28: distribution of crystal sizes (e.g.
Page 29 and 30: investigating magmatic evolution us
Page 31 and 32: length dispersive spectroscopy(WDS)
Page 33 and 34: microdrilling, a pre-cleaned square
Page 35 and 36: 1.7.2 Detroit Seamount, Part of the
Page 37 and 38: lations. Reprocessing of intrusive
Page 39 and 40: nucleated homogenously and grew thr
Page 41 and 42: With accurate partition coefficient
Page 43 and 44: uniform composition of large volume
Page 45 and 46: Figure 2.2. Hand sample and thin se
Page 47 and 48: 2.3.1 A Cogenetic Relationship Betw
Page 49 and 50: Figure 2.4. Stratigraphic section o
Page 51 and 52: Figure 2.5. Backscatter electron im
Page 53 and 54: studies of Kwaimbaita basalt by San
Page 55 and 56: 42 Crystal Zone An (mol%) TABLE 2.1
Page 57 and 58: 44 Crystal Zone An (mol%) 63R2 phen
Page 63 and 64: along the xenolith margins (e.g., F
Page 65: are more abundant in phenocrysts fr
Page 69 and 70: 56 TABLE 2.2 Continued Crystal Zone
Page 75 and 76: Figure 2.7. Measured major and trac
Page 77 and 78: 2.5.3.2 Trace Elements It is diffic
Page 79 and 80: Figure 2.9. Trace element ratio plo
Page 81 and 82: 2.5.4 Resorption Features in Site 1
Page 83 and 84: should, however, be noted that in t
Page 85 and 86: 2.6.1.2 An-rich OJP Plagioclase: In
Page 87 and 88: equivocally the roles of H2O, press
Page 89 and 90: ent magma requires significant clin
Page 91 and 92: tion driven plumes, or stirring by
Page 93 and 94: Yamashita, [123], and thus did not
Page 95 and 96: erally extensive crystal-mush netwo
Page 97 and 98: asalt at Site 1185 of ODP Leg 192 [
Page 99 and 100: CHAPTER 3 SHALLOW MAGMA EVOLUTION D
Page 101 and 102: magma compositions [23, 39, 98]. A
Page 103 and 104: Figure 3.2. Stratigraphy of basalts
Page 105 and 106: [118]. No volcaniclastic rocks were
Page 107 and 108: magmatic crystallization. Using the
Page 109 and 110: Figure 3.3. A cross polarized light
Page 111 and 112: 3.4.5 Major and Trace Element Data
Page 113 and 114: 3.4.6.1 Partition coefficients for
Page 115 and 116: 3.5.1.2 Site 884 CSDs I measured pl
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Figure 3.5. Plagioclase CSDs of ODP
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106 TABLE 3.2 CSD RESULTS Sample OD
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ln (n) [mm -4 ] ln (n) [mm -4 ] 10
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ulation A crystals are unzoned (An6
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Figure 3.8. a) The majority of Site
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3.5.4.3 Site 1203 Unit 31 and Site
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3.5.5 Trace Elements 3.5.5.1 Measur
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Unit 31 > Site 884 Unit 8 (Table 3.
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3.6 Discussion 3.6.1 Evidence of Cr
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3.6.1.1 Site 1203 Alkalic Basalts a
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etween the different crystal popula
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Unit 14 and 31 magmas accumulated o
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sition is similar to parent magmas
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Sr - low La/Ce population A parent
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The Unit 31 plagioclase CSD is kink
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was dominated by late stage clinopy
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pressure, and growth of An-rich pla
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138 TABLE 3.3 PLAGIOCLASE PHENOCRYS
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140 TABLE 3.3 Continued Sample Zone
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KP has been done via drilling at 11
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and over time crustal wall-rocks be
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flow [33]. I selected a single samp
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4.3.4 Major and Trace Element Data
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B) C) parafilm splash guard A) tape
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of these elements are the better co
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5 mm 5 mm Figure 4.4. Cross polariz
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4.4.2 Electron Probe Microanalysis
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An (mol %) An (mol %) An (mol %) An
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study exhibit their highest An at t
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4.4.3 LA-ICP-MS - Trace Elements An
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87 86 Sr/ SrI = 0.705722(8) Ba/Sr =
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and Rb (Fig. 4.11d,e). 4.4.3.3 Yttr
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Sr (ppm) Y (ppm) La (ppm) Ce (ppm)
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Unit 4 plagioclase rims plagioclase
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204 TABLE 4.4 UNIT 4 PLAGIOCLASE PA
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4.5 Discussion 4.5.0.1 Origin of Ma
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4.5.0.2 Insights from Trace Element
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that other factors influenced the a
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C A/B / D A/B C A/B / D A/B Unit 4
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Magma chambers tend to form at hori
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whole-rock basalt data. Cumulate xe
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over short time spans but may be ea
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lowing initial Elan Bank magma empl
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BIBLIOGRAPHY 1. C. Allegre, A. Prov
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22. B. Charlier, J. Davidson, O. Ba
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46. J. Fitton and M. Godard, Origin
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68. M. Higgins, Measurement of crys
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89. J. Longhi, D. Walker and J. Hay
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100 of Geophysical Monograph, pages
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129. J. Tarduno, W. Sliter, L. Kroe
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