TEXTURAL AND MICROANALYSIS OF IGNEOUS ROCKS: TOOLS ...

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87 Sr/ 86 SrI = 0.704937(10) Ba/Sr = 0.08 Rb/Sr = 0.0004 crystal A crystal J 87 Sr/ 86 SrI = 0.704951(14) Ba/Sr = 0.08 Rb/Sr = 0.0003 1 mm 87 Sr/ 86 SrI = 0.704902(10) Ba/Sr = 0.08 Rb/Sr = 0.0003 1 mm 87 Sr/ 86 SrI = 0.704845(6) Ba/Sr = 0.09 Rb/Sr = 0.0004 87 Sr/ 86 SrI = 0.704849(12) Ba/Sr = 0.07 Rb/Sr = 0.0002 87 86 Sr/ SrI = 0.704985(68) Ba/Sr = 0.08 Rb/Sr = 0.0004 1 mm A) B) crystal D Figure 4.8. Diagrams of zoning features in the three of five Unit 4 plagioclase phenocrysts that were subjects of EPMA, LA-ICP-MS and micro Sr isotope analyses. Thin dotted black lines mark the locations of core to rim EPMA transects. 87 Sr/ 86 SrI results are shown for each along with the measured 2σ error in parentheses. Measured Ba/Sr and Rb/Sr ratios are shown for each zone examined. A) The core of crystal A is bounded by a resorption surface that is marked with a dotted white line. Anorthite content increases from ∼ An65 to > An70 (see Fig. 4.6a). B)The core of crystal D is bounded by a resorption surface with an a change from ∼ An63 to > An67 across the surface (see Fig. 4.6c). C) Crystal J is a normal zoned crystal. There is a change in the zoning pattern marked noted by a white dotted line but no obvious resorption surface. (see also Fig. 4.6j). 195 C)
87 86 Sr/ SrI = 0.705722(8) Ba/Sr = 0.12 Rb/Sr = 0.0007 Ba/Sr = 0.12 Rb/Sr = 0.0006 1 mm 87 86 Sr/ SrI = 0.705575(10) Ba/Sr = 0.18 Rb/Sr = 0.0009 10-1D-A 87 86 Sr/ SrI = 0.705637(12) Ba/Sr = 0.17 Rb/Sr = 0.0010 87 86 Sr/ SrI = 0.705536(8) Ba/Sr = 0.14 Rb/Sr = 0.0006 87 86 Sr/ SrI = 0.705735(10) Ba/Sr = 0.15 Rb/Sr = 0.0008 87 86 Sr/ SrI = 0.705685(6) Ba/Sr = 0.16 Rb/Sr = 0.0009 Ba/Sr = 0.14 Rb/Sr = 0.0007 Ba/Sr = 0.18 Rb/Sr = 0.001 1 mm 1 mm Ba/Sr = 0.15 Rb/Sr = 0.0006 87 Sr/ 86 SrI = 0.705620(10) Ba/Sr = 0.17 Rb/Sr = 0.0010 Ba/Sr = 0.15 Rb/Sr = 0.0008 A) 10-1C-A B) 10-1C-D Figure 4.9. Diagrams of zoning features in the two of five Unit 10 plagioclase phenocrysts that were subjects of EPMA, LA-ICP-MS and micro Sr isotope analyses. Thin dotted black lines mark the locations of core to rim EPMA transects. 87 Sr/ 86 SrI results are shown for each along with the measured 2σ error in parentheses. Measured Ba/Sr and Rb/Sr ratios are shown for each zone examined. A) Crystal 10-1C-A contains four distinct zones that were sampled. These zones are visible in the cross polarized light photo. These zones, which were each sampled, are ∼An60 in the core, an ∼An65 intermediate zone, an ∼An60 intermediate zone, and an > An65 rim zone (see Fig. 4.7b). B) Crystal 10-1C-D contains abundant oscillatory zoning but has an overall reverse zonation pattern and at least two zones, which were each sampled, where An content is higher (up to An65 than the core An61−62 (see Fig. 4.7f). C) Crystal 10-1D-A appears to be a fragment of a large crystal with an oscillatory zoned interior. This crystal has an obvious resorption surface near the rim that in accompanied by a change in from An62−63 to > An66. 196 C)
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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
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54 Crystal Zone 5 ML-X1 xenolith TA
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56 TABLE 2.2 Continued Crystal Zone
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Figure 2.7. Measured major and trac
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2.5.3.2 Trace Elements It is diffic
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Figure 2.9. Trace element ratio plo
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2.5.4 Resorption Features in Site 1
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should, however, be noted that in t
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2.6.1.2 An-rich OJP Plagioclase: In
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equivocally the roles of H2O, press
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ent magma requires significant clin
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tion driven plumes, or stirring by
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Yamashita, [123], and thus did not
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erally extensive crystal-mush netwo
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asalt at Site 1185 of ODP Leg 192 [
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CHAPTER 3 SHALLOW MAGMA EVOLUTION D
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magma compositions [23, 39, 98]. A
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Figure 3.2. Stratigraphy of basalts
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[118]. No volcaniclastic rocks were
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magmatic crystallization. Using the
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Figure 3.3. A cross polarized light
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3.4.5 Major and Trace Element Data
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3.4.6.1 Partition coefficients for
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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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142 TABLE 3.3 Continued Sample Zone
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Page 187 and 188: KP has been done via drilling at 11
Page 189 and 190: and over time crustal wall-rocks be
Page 191 and 192: flow [33]. I selected a single samp
Page 193 and 194: 4.3.4 Major and Trace Element Data
Page 195 and 196: B) C) parafilm splash guard A) tape
Page 197 and 198: of these elements are the better co
Page 199 and 200: 5 mm 5 mm Figure 4.4. Cross polariz
Page 201 and 202: 4.4.2 Electron Probe Microanalysis
Page 203 and 204: An (mol %) An (mol %) An (mol %) An
Page 205 and 206: study exhibit their highest An at t
Page 207: 4.4.3 LA-ICP-MS - Trace Elements An
Page 211 and 212: and Rb (Fig. 4.11d,e). 4.4.3.3 Yttr
Page 213 and 214: Sr (ppm) Y (ppm) La (ppm) Ce (ppm)
Page 215 and 216: Unit 4 plagioclase rims plagioclase
Page 217 and 218: 204 TABLE 4.4 UNIT 4 PLAGIOCLASE PA
Page 219 and 220: 4.5 Discussion 4.5.0.1 Origin of Ma
Page 221 and 222: 4.5.0.2 Insights from Trace Element
Page 223 and 224: that other factors influenced the a
Page 225 and 226: C A/B / D A/B C A/B / D A/B Unit 4
Page 227 and 228: Magma chambers tend to form at hori
Page 229 and 230: whole-rock basalt data. Cumulate xe
Page 231 and 232: over short time spans but may be ea
Page 233 and 234: lowing initial Elan Bank magma empl
Page 235 and 236: BIBLIOGRAPHY 1. C. Allegre, A. Prov
Page 237 and 238: 22. B. Charlier, J. Davidson, O. Ba
Page 239 and 240: 46. J. Fitton and M. Godard, Origin
Page 241 and 242: 68. M. Higgins, Measurement of crys
Page 243 and 244: 89. J. Longhi, D. Walker and J. Hay
Page 245 and 246: 100 of Geophysical Monograph, pages
Page 247 and 248: 129. J. Tarduno, W. Sliter, L. Kroe
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TEXTURAL AND MICROANALYSIS OF IGNEOUS ROCKS: TOOLS ...

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