The systematics of boron abundances in young volcanic rocks

Ryan, Jeffrey G.; Langmuir, C. H.

doi:10.1016/0016-7037(93)90008-k

Cited by 231 publications

(135 citation statements)

References 52 publications

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“…Ridge fluids relative to Vienna Woods, consistent with greater B enrichment in more silicic rock compositions and the increased influence of recycled slab material as the arc is approached (Spivack and Edmond, 1987;Ryan and Langmuir, 1993). Because of the strong affinity of B for fluids, however, we cannot exclude magmatic degassing as an additional source of B to hydrothermal fluids at Pual Ridge (Ryan and Langmuir, 1993;Arnorsson and Andresdottir, 1995;Audetat et al, 1998).…”

Section: Alkalis and Bmentioning

confidence: 72%

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Laboratory and field-based investigations of subsurface geochemical processes in seafloor hydrothermal systems

Reeves¹

2010

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This thesis presents the results of four discrete investigations into processes governing the organic and inorganic chemical composition of seafloor hydrothermal fluids in a variety of geologic settings. Though Chapters 2 through 5 of this thesis are disparate in focus, each represents a novel investigation aimed at furthering our understanding of subsurface geochemical processes affecting hydrothermal fluid compositions. Chapters 2 and 3 concern the abiotic (nonbiological) formation of organic compounds in high temperature vent fluids, a process which has direct implications for the emergence of life in early Earth settings and sustainment of present day microbial populations in hydrothermal environments. Chapter 2 represents an experimental investigation of methane (CH 4 ) formation under hydrothermal conditions. The overall reduction of carbon dioxide (CO 2 ) to CH 4 , previously assumed to be kinetically inhibited in the absence of mineral catalysts, is shown to proceed on timescales pertinent to crustal residence times of hydrothermal fluids. In Chapter 3, the abundance of methanethiol (CH 3 SH), considered to be a crucial precursor for the emergence of primitive chemoautotrophic life, is characterized in vent fluids from ultramafic-, basalt-and sediment-hosted hydrothermal systems. Previous assumptions that CH 3 SH forms by reduction of CO 2 are not supported by the observed distribution in natural systems. Chapter 4 investigates factors regulating the hydrogen isotope composition of hydrocarbons under hydrothermal conditions. Isotopic exchange between low molecular weight n-alkanes and water is shown to be facilitated by metastable equilibrium reactions between alkanes and their corresponding alkenes, which are feasible in natural systems. In Chapter 5, the controls on vent fluid composition in a backarc hydrothermal system are investigated. A comprehensive survey of the inorganic geochemistry of fluids from sites of hydrothermal activity in the eastern Manus Basin indicates that fluids there are influenced by input of acidic magmatic solutions at depth, and subsequently modified by variable extents of seawater entrainment and mixing-related secondary acidity production. CHAPTER 1 IntroductionSeafloor hydrothermal systems associated with the generation of oceanic crust represent a dramatic expression of heat and mass transfer from the interior of the Earth. In addition to profound effects on ocean chemistry, convective circulation of seawater through volcanically active oceanic crust leads to the formation of metal sulfide deposits. In addition, seafloor hot springs are often invoked as ideal settings from which early microbial life could have emerged.Since the initial discovery of low temperature venting at the Galápagos Spreading Center in 1977 (CORLISS et al., 1979), our understanding of the composition and diversity of hydrothermal solutions has expanded greatly. During convection through oceanic crust of basaltic composition, O 2 -replete seawater reacts with crustal rock, typically producin...

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Section: Alkalis and Bmentioning

confidence: 72%

“…Because of the strong affinity of B for fluids, however, we cannot exclude magmatic degassing as an additional source of B to hydrothermal fluids at Pual Ridge (Ryan and Langmuir, 1993;Arnorsson and Andresdottir, 1995;Audetat et al, 1998).…”

Section: Alkalis and Bmentioning

confidence: 99%

Laboratory and field-based investigations of subsurface geochemical processes in seafloor hydrothermal systems

Reeves¹

2010

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“…Analyses of B isotopes in OIB are less difficult and slightly more precise than B isotope analyses of MORB glasses, because many have higher B abundances by a factor of two to three (e.g., Ryan and Langmuir 1993). However, this does not apply to all OIB samples.…”

Section: Ocean Island Basaltsmentioning

confidence: 99%

Boron Isotopes in the Ocean Floor Realm and the Mantle

Marschall

2017

Advances in Isotope Geochemistry

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This chapter reviews the boron isotopic composition of the ocean floor, including pristine igneous oceanic crust such as mid-ocean ridge basalts and ocean island basalts and their implications for the B isotopic composition of the mantle. The chapter further discusses the B isotopic effects of assimilation of altered crustal materials in mantle-derived magmas. The systematics of seawater alteration on oceanic rocks are discussed, including sediments, igneous crust and serpentinization of ultramafic rocks and the respective marine hydrothermal vent fluids. The chapter concludes with a discussion of the secular evolution of the B isotopic composition of seawater.

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“…Boron, zirconium, niobium, hafnium and tantalum all behave as incompatible elements during magmatic processes (Sun and McDonough, 1989;Ryan and Langmuir, 1993). In aqueous fluid-related processes, however, the behavior of boron is in striking contrast to that of zirconium, niobium, hafnium and tantalum.…”

Section: Introductionmentioning

confidence: 99%

“…This problem is avoidable when boron is determined by inductively coupled plasma-atomic emission spectrometry (ICP-AES) after sample digestion using the alkali fusion technique (Ryan and Langmuir, 1993) or by prompt γ-ray neutron activation analysis (PGNAA) without sample digestion (Gladney et al, 1976). However, these methods are of limited utility for the analysis of low levels of boron as well as for the determination of HFSEs.…”

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confidence: 99%

A simple method for the precise determination of boron, zirconium, niobium, hafnium and tantalum using ICP-MS and new results for rock reference samples

Nagaishi

Ishikawa

2009

Geochem. J.

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An analytical technique for determining boron, zirconium, niobium, hafnium and tantalum contents in rock samples by inductively coupled plasma mass spectrometry (ICP-MS) is described. The rock samples (<30 mg) were decomposed with mannitol-added HF, and dissolved in a 0.015 M HF/0.12 M HNO 3 acid mixture for ICP-MS analysis. Boron, zirconium, niobium, hafnium and tantalum concentrations were measured by the internal calibration curve method using three internal standard elements, beryllium for boron, indium for zirconium and niobium, and rhenium for hafnium and tantalum. Seventeen rock reference samples from the Geological Survey of Japan and the U.S. Geological Survey were analyzed, and the determined concentrations showed good agreement with the reported values obtained by isotope dilution method, as well as with the recommended values. This technique is a simple method for the precise determination of boron, zirconium, niobium, hafnium and tantalum concentrations, and it has wide potential for geochemical application, particularly for the determination of boron.Keywords: ICP-MS, analytical method, rock reference samples, boron, high field strength elements 1990; Ishikawa and Nakamura, 1994;Ishikawa and Tera, 1997;Tonarini et al., 2001). Although the isovalent element pairs zirconium-hafnium and niobium-tantalum have very similar ionic radii and generally behave coherently during magmatic processes, the Zr/Hf and Nb/Ta ratios of some mantle-derived igneous rocks deviate sub-

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The systematics of boron abundances in young volcanic rocks

Cited by 231 publications

References 52 publications

Laboratory and field-based investigations of subsurface geochemical processes in seafloor hydrothermal systems

Laboratory and field-based investigations of subsurface geochemical processes in seafloor hydrothermal systems

Boron Isotopes in the Ocean Floor Realm and the Mantle

A simple method for the precise determination of boron, zirconium, niobium, hafnium and tantalum using ICP-MS and new results for rock reference samples

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