TEXTURAL AND MICROANALYSIS OF IGNEOUS ROCKS: TOOLS ...

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105 TABLE 3.1 CSD MEASUREMENT INFORMATION Sample ODP Site Unit Mineral Crystals Measured Area Measured (mm 2 ) Habit (S:I:L) Habit R 2 17R5-34-36 1203 1 plagioclase 1502 560.2 1-3.2-8 0.78 19R2-136-138 1203 3 top plagioclase 2356 100.4 1-3.2-10 0.74 20R3-4-10 1203 3 bottom plagioclase 3477 105.9 1-3.2-10 0.80 31R1-29-31 1203 8 plagioclase 721 516 1-3.2-10 0.69 32R3-85-87 PL 1203 11 plagioclase 842 585.2 1-2.9-7 0.80 32R3-85-87 OL 1203 11 olivine 462 585.2 1-1.5-1.8 0.92 36R4-92-95 1203 14 plagioclase 3388 72.3 1-4.0-9.0 0.88 37R3-10-13 PL 1203 16 plagioclase 1781 350.5 1-3.4-9 0.85 37R3-10-13 OL 1203 16 olivine 859 350.5 1-1.25-1.9 0.89 40R5-119-121 1203 18 plagioclase 2762 478.1 1-4.0-10 0.90 42R5-20-23 1203 19 plagioclase 1285 711.8 1-3.6-7 0.86 52R6-12-14 1203 23 plagioclase 3280 327.8 1-3.2-10 0.88 57R2-127-129 1203 23 plagioclase 2722 199.7 1-3.4-9 0.87 59R2-99-102 1203 24 plagioclase 2580 394 1-4.0-9.0 0.91 59R5-30-32 1203 26 plagioclase 1902 108 1-4.0-9.0 0.86 68R4-29-30 1203 31 plagioclase 2227 164.9 1-2.9-5.5 0.84 9R1-36-45 884 8 top plagioclase 2653 857.7 1-3.0-10 0.82 9R2-60-75 884 8 middle plagioclase 2406 861.5 1-3.2-8 0.83 9R3-1-12 884 8 bottom plagioclase 2940 789.7 1-3.2-8 0.85 10R2-31-43 884 10 top plagioclase 2711 805.1 1-3.4-7 0.84 10R3-60-74 884 10 middle plagioclase 2329 728.8 1-3.2-8 0.82 10R4-33-49 884 10 bottom plagioclase 2561 576.7 1-3.6-7 0.88 1 Crystal habit was estimated using the CSDslice program written by Morgan and Jerram [106]. S:I:L = short:intermediate:long axis lengths.
106 TABLE 3.2 CSD RESULTS Sample ODP Site Unit Mineral CSD segment Slope (mm −1 ) σ (slope) ln n o (mm −4 ) σ (intercept) X plag X oliv 17R5-34-36 1203 1 plagioclase linear -1.95 0.03 3.57 0.04 0.13 – 19R2-136-138 1203 3 top plagioclase A -4.47 0.06 7.68 0.03 0.23 – B -1.26 0.02 1.69 0.01 – – 20R3-4-10 1203 3 bottom plagioclase A -4.33 0.05 7.86 0.02 0.17 – 31R1-29-31 1203 8 plagioclase A -4.24 0.08 5.01 0.07 0.04 – B -0.96 0.02 -0.49 0.01 – – 32R3-85-87 PL 1203 11PL plagioclase A -1.80 0.04 2.73 0.19 0.08 0.38 32R3-85-87 OL 1203 11OL olivine A -2.01 0.08 1.38 0.03 0.08 0.38 36R4-92-95 1203 14 plagioclase A -10.80 0.16 9.89 0.03 0.2 – B -1.31 0.02 0.86 0.00 – – 37R3-10-13 PL 1203 16PL plagioclase linear -3.55 0.05 5.82 0.06 0.07 0.3 37R3-10-13 OL 1203 16OL olivine linear -4.07 0.12 3.34 0.07 0.07 0.3 40R5-119-121 1203 18 plagioclase A -3.71 0.06 6 0.04 0.11 – B -0.91 0.02 -1.15 0.01 – – 42R5-20-23 1203 19 plagioclase A -3.90 0.06 4.44 0.05 0.14 – B -1.10 0.02 -0.11 0.00 – – 52R6-12-14 1203 23 plagioclase linear -2.99 0.04 6.18 0.04 0.14 – 57R2-127-129 1203 23 plagioclase A -4.43 0.08 6.91 0.04 0.11 – 59R2-99-102 1203 24 plagioclase linear -4.36 0.09 6.12 0.05 0.07 – 59R5-30-32 1203 26 plagioclase linear -6.27 0.13 7.75 0.06 0.09 – 68R4-29-30 1203 31 plagioclase A -17.77 0.21 9.26 0.03 0.18 – B -1.69 0.02 1.72 0.01 – – 9R1-36-45 884 8 top plagioclase A -1.36 0.02 3.02 0.03 0.17 – 9R2-60-75 884 8 middle plagioclase A -2.01 0.03 3.48 0.03 0.36 – B -0.31 0.00 -4.32 0.04 – – 9R3-1-12 884 8 bottom plagioclase A -2.52 0.05 4.27 0.03 0.27 – B -0.39 0.01 -3.8 0.03 – – 10R2-31-43 884 10 top plagioclase A -3.79 0.05 4.94 0.04 0.34 – B -0.59 0.01 -1.94 0.02 – – 10R3-60-74 884 10 middle plagioclase A -2.12 0.03 3.83 0.03 0.43 – B -0.37 0.01 -2.95 0.03 – – 10R4-33-49 884 10 bottom plagioclase A -4.07 0.07 5.57 0.04 0.24 – B -0.95 0.02 -0.65 0.00 – – 1 Segment A of a curved or kinked CSD here refers to the small crystals that populate the steeper segment, whereas segment B refers to the larger crystals. 2 1σ errors were calculated following the protocol of Higgins [68]. 3 Several samples listed contained sparse olivine phenocrysts but each less than 5% by volume unless otherwise noted.
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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
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thus been debate within the volcano
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Cambrian schist) including a crysta
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explosive eruption vs. mild effusiv
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tiation (e.g., [84, 98]; Fig. 1.3).
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defined as having crystallinities b
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12 Figure 1.4: Large Igneous Provin
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distribution of crystal sizes (e.g.
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investigating magmatic evolution us
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length dispersive spectroscopy(WDS)
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microdrilling, a pre-cleaned square
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1.7.2 Detroit Seamount, Part of the
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lations. Reprocessing of intrusive
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nucleated homogenously and grew thr
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With accurate partition coefficient
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uniform composition of large volume
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Figure 2.2. Hand sample and thin se
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2.3.1 A Cogenetic Relationship Betw
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Figure 2.4. Stratigraphic section o
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Figure 2.5. Backscatter electron im
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studies of Kwaimbaita basalt by San
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42 Crystal Zone An (mol%) TABLE 2.1
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44 Crystal Zone An (mol%) 63R2 phen
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along the xenolith margins (e.g., F
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are more abundant in phenocrysts fr
Page 67 and 68: 54 Crystal Zone 5 ML-X1 xenolith TA
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
Page 117: Figure 3.5. Plagioclase CSDs of ODP
Page 121 and 122: ln (n) [mm -4 ] ln (n) [mm -4 ] 10
Page 123 and 124: ulation A crystals are unzoned (An6
Page 125 and 126: Figure 3.8. a) The majority of Site
Page 127 and 128: 3.5.4.3 Site 1203 Unit 31 and Site
Page 129 and 130: 3.5.5 Trace Elements 3.5.5.1 Measur
Page 131 and 132: Unit 31 > Site 884 Unit 8 (Table 3.
Page 133 and 134: 3.6 Discussion 3.6.1 Evidence of Cr
Page 135 and 136: 3.6.1.1 Site 1203 Alkalic Basalts a
Page 137 and 138: etween the different crystal popula
Page 139 and 140: Unit 14 and 31 magmas accumulated o
Page 141 and 142: sition is similar to parent magmas
Page 143 and 144: Sr - low La/Ce population A parent
Page 145 and 146: The Unit 31 plagioclase CSD is kink
Page 147 and 148: was dominated by late stage clinopy
Page 149 and 150: pressure, and growth of An-rich pla
Page 151 and 152: 138 TABLE 3.3 PLAGIOCLASE PHENOCRYS
Page 153 and 154: 140 TABLE 3.3 Continued Sample Zone
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156 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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