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University of California, San Diego UNIVERSITY OF CALIFORNIA, SAN DIEGO Fluid Origins, Paths, and Fluid-Rock Reactions At Convergent Margins, Using Halogens, Cl Stable Isotopes, and Alkali Metals As Geochemical Tracers A dissertation submitted in partial satisfaction of the requirements for the degree Doctor of Philosophy in Earth Sciences by Wei Wei Committee in charge: Professor Miriam Kastner, Chair Professor Neal Driscoll Professor Joris Gieskes Professor David Hilton Professor Arthur Spivack Professor Mark Thiemens 2007 ©Copyrights Wei Wei, 2007 All rights reserved The dissertation of Wei Wei is approved, and it is acceptable in quality and form for publication on microfilm: Chair University of California, San Diego 2007 iii TABLE OF CONTENTS Signature Page………………………………………………………………… iii Table of Contents……………………………………………………………... iv List of Figures…………………………………………………………………. vi List of Tables………………………………………………………………….. x Acknowledgements……………………………………………………………. xi Vita and Publications………………………………………………………….. xiv Abstract………………………………………………………………………... xvi Chapter 1. Introduction………………………………………………………... 1 1.1 The importance of fluids at convergent margins…………………… 1 1.2 Application of halogen system, Cl, Sr, Li and B isotopes, and alkali elements………………………………………………………………… 4 1.3 Outline of the thesis………………………………………………… 8 Chapter 2. Chlorine stable isotopes and halogen concentrations in convergent margins…………………………………………………………………. 12 2.1 Introduction on Cl stable isotope and halogens …………………..... 12 2.2 Geologic background of studied areas……………………………… 14 2.3 Analytical methods…………………………………………………. 31 2.4 Results and discussions of Nankai Trough…………………………. 37 2.5 Results and discussions of Costa Rica Subduction Zone…………… 50 2.6 Results and discussions of Mariana Mud Volcanoes……………….. 63 2.7 Implications of Cl isotope cycle on Earth…………………………... 80 iv Chapter 3. Hydrothermal experiments………………………………………… 90 3.1 Introduction ………………………………………………………… 90 3.2 Methods…………………………………………………………….. 93 3.3 Results and discussions……………………………………………... 97 3.4 Implications…………………………………………………………. 131 Chapter 4. Summary and prospective…………………………………………. 141 4.1 Summary …………………………………………………………… 141 4.2 Prospective………………………………………………………….. 147 References……………………………………………………………………... 150 v LIST OF FIGURES Figure 2.2.1 ODP Leg 190 in the Nankai Trough………………………… 20 Figure 2.2.2 Seismic reflection profile, Muroto Transect, Sites 1173, 1174, and 808………………………………………………... 21 Figure 2.2.3 Correlation of facies units, magnetic susceptibility, and major time boundaries within stratigraphic successions of the reference and prism toe sites at the Muroto Transect at Nankai margin………………………….................................. 22 Figure 2.2.4 Cl concentration (mM)-depth profiles along the Muroto transect at Nankai Trough…………………………………… 23 Figure 2.2.5 (A)Location map and (B) Bathymetric map of Leg 170 and 205 drill sites………………………………………………… 24 Figure 2.2.6 Migrated multi-channel seismic profile across the Middle America Trench……………………………………………… 25 Figure 2.2.7 Summary of recovered lithology at drill sites at the Costa Rica margin. ………………………………………………… 26 Figure 2.2.8 Cl concentration depth profiles at the Costa Rica transect………………………………………………………. 27 Figure 2.2.9 Bathymetric map of the southern Mariana forearc showing locations of all forearc seamounts sampled to date…………. 28 Figure 2.2.10 Location of Holes 1200A-1200E on the summit knoll of South Chamorro Seamount………………………………….. 29 Figure 2.2.11 Pore water composition vs. depth curves for Holes 1200D, 1200E, and 1200F. A. pH. B. Alkalinity. C. Sodium/chloride. D. Boron. E. Sulfate..…………………….. 30 Figure 2.4.1 δ37Cl (‰)-depth profiles in pore fluids and Cl concentrations of corresponding solids at the Nankai Trough transect………………………………………………………. 44 Figure 2.4.2 Br/Cl molar ratio-depth profiles in pore fluids at the Nankai Trough. Seawater value is denoted by dotted line…………………………………………………………... 45 Figure 2.4.3 F concentration depth profiles in pore fluids and in solids at the Nankai Trough…………………………………………... 46 Figure 2.4.4 Sr concentration depth profiles of pore fluid at Nankai Muroto transect……………………………………………… 47 vi Figure 2.4.5 87Sr/86Sr depth profiles of pore fluid at Nankai Muroto transect………………………………………………………. 48 Figure 2.4.6 Mixing relationships between 87Sr/87Sr ratios and 1/Sr at Nankai Muroto transect……………………………………… 49 Figure 2.5.1 δ37Cl (‰)-depth profiles in pore fluids at Costa Rica subduction zone transect…………………………………….. 57 Figure 2.5.2 Br/Cl molor ratio-depth profiles in pore fluids at the Costa Rica subduction zone transect……………………………….. 58 Figure 2.5.3 F concentration depth profiles in pore fluids at the Costa Rica subduction zone transect……………………………….. 59 Figure 2.5.4 Sr concentration depth profiles of pore fluid at Costa Rica subduction zone……………………………………………… 60 Figure 2.5.5 87Sr/86Sr depth profiles of pore fluid at Costa Rica subduction zone……………………………………………… 61 Figure 2.5.6 Modeled δ37Cl fractionation at the décollement caused by advection-diffusion at Site 1043 and Site 1040, Costa Rica subduction zones…………………………………………….. 62 Figure 2.6.1 A. δ37Cl (‰)-depth profile in pore fluids at the Mariana subduction zone, South Chamorro seamount ODP Site 1200. B. δ37Cl (‰)-depth profile of serpentines from the Mariana subduction zone, South Chamorro seamount ODP Site 1200…………………………………………………………. 74 Figure 2.6.2 (A)Br concentration-depth profiles, (B)Br/Cl concentration ratios-depth profiles (C) F concentration-depth profiles, (D) F/Cl concentration ratios-depth profiles (E) Cl concentrations in pore fluids at Site 1200, ODP Leg 195………………………………………………………….. 75 Figure 2.6.3 Br/Cl vs 1/Cl plots of pore fluids at (A) Mariana, (B) Nankai, and (C) Costa Rica subduction zones…………...................... 76 Figure 2.6.4 (A) B/Cl concentration ratio-depth profiles in pore fluids of all the holes at Site 1200; (B) B concentrations-depth profiles in both pore fluids and solids; (C) δ11B in both pore fluids and solids at Site 1200, Holes A and E, ODP Leg 195………………………………………… 77 vii Figure 2.6.5 δ11B vs 1/B in pore fluids at Site 1200, Site 1200 Hole A and E, ODP Leg 195……………………………………………... 78 Figure 2.6.6 TG-DSC results for three different forms of serpentines………….………………………………………... 79 Figure 3.3.1 Si concentration versus temperature in (a) basalt and (b) smectite experiments………………………………………… 120 Figure 3.3.2 Major element concentrations (normalized to Cl) versus temperature in hydrothermal experimental fluids: (a) Mg/Cl versus temperature in basalt experiment; (b) Mg/Cl versus temperature in smectite experiment; (c) Ca/Cl versus temperature in basalt experiment; (d) Ca/Cl versus temperature in smectite experiment……….. 121 Figure 3.3.3 Alkali element concentrations normalized to Cl (µM/mM) versus temperature in reacting fluids in basalt experiment: (a) K/Cl; (b) Li/Cl; (c) Rb/Cl; (d) Cs/Cl……………………. 122 Figure 3.3.4 Alkali element concentrations normalized to Cl (µM/mM) versus temperature in reacting fluids in smectite experiment: (a) K/Cl; (b) Li/Cl; (c) Rb/Cl; (d) Cs/Cl……………………. 123 Figure 3.3.5 Br/Cl and Sr/Cl versus temperature in hydrothermal experimental fluids: (a) Ba/Cl versus temperature in basalt experiment; (b) Ba/Cl versus temperature in smectite experiment…………………………………………………… 124 Figure 3.3.6 (a) U concentration and (b) F concentration versus temperature in hydrothermal experimental fluids of smectite experiment……….................................................................... 125 Figure 3.3.7 U concentration and F concentration cross plot in the smectite-sw experiment from 35 to 350°C………………….. 126 Figure 3.3.8 The reactivity of the solid for Li versus temperature in both basalt and smectite experiments…………………………….. 127 Figure 3.3.9 Analyzed and calculated Li isotope ratio versus temperature in (a) basalt + sw experiment; and (b) smectite + sw experiment………………………………............................... 128 Figure 3.3.10 Sr/Cl (µM/mM) versus temperature in (a) basalt; and (b) smectite experiments……………………………………….. 129 Figure 3.3.11 87Sr/86Sr versus temperature in (a) basalt-sw experiment; and (b) smectite-sw experiment…………………………………. 130 Figure 3.4.1 Depth profiles of (a) K and (b) Li/K in Costa Rica (ODP Sites 1040 and 1254)………………………………………... 139 viii Figure 3.4.2 Li/K (µM/mM) versus K concentration. The data above the green dashed line are for the temperatures above 150 ºC…… 140 ix LIST OF TABLES Table 1.2.1 Summary of published halogen concentrations and δ37Cl values ……………………………………………………. 11 Table 2.2.1 Main Geologic characteristics of the three subduction zones……………………………………………………... 19 Table 2.6.1 Fluorine and chlorine concentrations (ppm) and δ37Cl (‰) values in selected serpentines, analyzed in this study……………………………………………………... 73 Table 2.7.1 Data-base for the marine δ37Cl cycle……………………. 88 Table 3.2.1 Starting Reactants……………………………………….. 96 Table 3.3.1 Major and trace element concentrations in the reacting fluids from 35 to 350 °C in different experiments: (a) basalt + sw; (b) basalt + asw; (c) smectite + sw; (d) smectite+ asw; (e) basalt/smectite (2/1)+ asw…………… 113 Table 3.3.2 Major and trace element compositions in the Starting and Ending Solids at 350 ºC………………………………….. 118 Table 3.3.3 Estimated reactivity, distribution coefficient (K) and fractionation factor (α), Li concentration and δ7Li (calculated and measured values) with temperature in basalt-sw and smectite-sw reactions…………………….. 119 Table 3.4.1 Alkali metal concentrations and δ7Li values at 350 ºC in the basalt+sw experiments and in natural hydrothermal fluids……………………………………………………... 137
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