Boron-lithium relationships in rhyolites and associated thermal waters of young silicic calderas, with comments on incompatible element behaviour

Shaw, Denis M.; Sturchio, Neil C.

doi:10.1016/0016-7037(92)90165-f

Cited by 39 publications

(11 citation statements)

References 44 publications

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“…For samples 17 and 31 the B/Cl and Li/Cl ratios (Figs. 8b-c), similar to those of seawater, seem to support the previous hypothesis, while the other samples show higher B and Li concentrations that support water-rock interaction processes involving clay minerals (Shaw and Sturchio, 1992). In addition, the B enrichment observed in the unconfined aquifer may be ascribed to the massive use of fertilizers (Spivak et al, 1987;Dotsika et al, 2006).…”

Section: Chemical and Isotopic Composition Of Waterssupporting

confidence: 54%

Geochemistry of shallow aquifers and soil gas surveys in a feasibility study at the Rivara natural gas storage site (Po Plain, Northern Italy)

Sciarra

Cinti

Pizzino

et al. 2013

Applied Geochemistry

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Section: Chemical and Isotopic Composition Of Waterssupporting

confidence: 54%

Geochemistry of shallow aquifers and soil gas surveys in a feasibility study at the Rivara natural gas storage site (Po Plain, Northern Italy)

Sciarra

Cinti

Pizzino

et al. 2013

Applied Geochemistry

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“…Boron was determined by prompt gamma neutron activation using the McMaster Nuclear Reactor. This method has been described by Higgins et al (1984); precision and accuracy have been reported by Shaw and Sturchio (1992). The quality of the trace element data can be judged from replicate analyses of the standard rocks (Appendix 1).…”

Section: Methodsmentioning

confidence: 99%

“…Seyfried et al (1984) also found that, at lower temperature (150~ Li can be removed from seawater and incorporated into altered basalt. Shaw and Sturchio (1992) attributed the increase of Li in rhyolites during low-T aqueous alteration to its absorption on clay minerals, and Li depletion in hydrothermally-altered rocks to leaching. A similar explanation can probably be invoked for the basalts analysed in this study.…”

Section: Lithium the Tholeiitic Basalts Altered By Relatively High Tmentioning

confidence: 99%

Distribution of boron, lithium and beryllium in ocean island basalts from French Polynesia: implications for the B/Be and Li/Be ratios as tracers of subducted components

1996

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The study focuses on the distribution of B, Be, Li, rare earth elements (REE), high-field-strength elements (HFSE), Th, U and Pb in fresh and hydrothermally altered ocean island basalts (OIB) from French Polynesia, and evaluates B/Be and Li/Be ratios as potential tracers of subducted components in the mantle. Hydrothermal solutions affecting the rocks during cooling were derived from meteoric water, sea water and magmatic fluids. The concentrations of REE, HFSE, Th and Be in the OIB were not affected by secondary processes except during advanced stages of subaerial hydrothermal alteration where saponite was a dominant secondary phase. This alteration modified the contents of these elements, changed REE patterns and produced a positive Ce anomaly. The subaerial and submarine hydrothermal alteration (T ~ 70-100~ may change U concentrations in OIB, whereas Pb was only marginally redistributed during alteration.Boron was enriched during submarine and subaerial hydrothermal alteration but was not noticeably affected in basalts altered by magmatic fluids at T > 200~ Like B, the mobility of Li during the alteration varies with fluid temperature. Lithium became enriched in the basalts during advanced stages of lower T hydrothermal alteration (<100~ However, this element was partly removed from the rocks during higher T alteration (>200~ by magmatic fluids. Boron, Be and Li behave as incompatible trace elements in basaltic magmas. Beryllium content in primitive mantle is estimated to be 0.07 ppm. Fresh Polynesian OIB have low abundances of B and Li and low B/Be (2-5) and Li/Be (2.5-5) ratios compared with volcanic arc rocks, marine sediments and altered oceanic crust. Various OIB including even those which have HIMU-and EMaffinities have similar overlapping B/Be and Li/Be ratios. Both B and Li are probably stripped from a lithospheric slab during subduction-related metamorphism and are, thus, not involved in deep mantle recycling. The mantle-normalized trace element abundances of MORB and OIB usually display patterns characterized by negative B, Pb and Li anomalies. The patterns of continental crust and crustal rocks have distinct positive anomalies for these elements whereas continental basaltic rocks have variable relative abundances of B, Pb and Li. The anomalies of these elements in basalts can be useful in discriminating their tectonic setting and constraining the mantle source regions of basalts.

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“…Continental hot spring waters, where essentially undiluted, have high Li concentrations (most in the range 0.1 to 10 ppm; Brondi et al 1973;White et al 1976;Shaw and Sturchio 1992). Although they showed a large range in Li isotopic composition ( 7 Li = +1.0 to +34.8; Bullen and Kharaka 1992;Falkner et al 1997;Sturchio and Chan 2003;Tomascak et al 2003), the majority of these fl uids were fairly similar to marine hydrothermal vent fl uids in terms of Li concentration and isotopic composition (average 7 Li = +5.1 vs. +8.1 in vent fl uids) (Fig.…”

Section: Lithium Isotopic Fractionation On the Continentsmentioning

confidence: 98%

Developments in the Understanding and Application of Lithium Isotopes in the Earth and Planetary Sciences

Tomascak

2004

Reviews in Mineralogy and Geochemistry

232

152

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INTRODUCTIONThe signifi cant relative mass difference (c. 16%) between the two stable isotopes of Li (approximately 6 Li 7.5%, 7 Li 92.5%), coupled with broad elemental dispersion in Earth and planetary materials, makes this a system of considerable interest in fi ngerprinting geochemical processes, determining mass balances, and in thermometry. Natural mass fractionation in this system is responsible for c. 6% variation among materials examined to date ( Fig. 1). Although the "modern era" of Li isotope quantifi cation has begun, there are still many questions about the Li isotopic compositions of fundamental materials and the nature of fractionation by important mechanisms that are unanswered (e.g., Hoefs 1997). Figure 1. Summary of lithium isotopic compositions of Earth and planetary materials. Filled bars are solid samples, open bars are liquids. See text for references and details. Tomascak 154The purpose of this chapter is to summarize the current understanding of Li isotopes in geo-and cosmochemical systems and to indicate (1) where Li isotopes have a high probability of adding new understanding of these systems; (2) where some of the more signifi cant defi cits in knowledge exist. The small but burgeoning Li isotope community has not yet compiled the volume of peer-reviewed literature needed to adequately assess even that which has been studied to date. As a result, signifi cant portions of this chapter are based on data reported in abstracts, and as such are more than normally subject to revisions over time. This chapter is anticipated to serve as a starting point for those interested in research incorporating Li isotope geochemistry, or in understanding the state of extant research. BACKGROUND: LITHIUM ISOTOPES IN THE SCIENCES

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Boron-lithium relationships in rhyolites and associated thermal waters of young silicic calderas, with comments on incompatible element behaviour

Cited by 39 publications

References 44 publications

Geochemistry of shallow aquifers and soil gas surveys in a feasibility study at the Rivara natural gas storage site (Po Plain, Northern Italy)

Geochemistry of shallow aquifers and soil gas surveys in a feasibility study at the Rivara natural gas storage site (Po Plain, Northern Italy)

Distribution of boron, lithium and beryllium in ocean island basalts from French Polynesia: implications for the B/Be and Li/Be ratios as tracers of subducted components

Developments in the Understanding and Application of Lithium Isotopes in the Earth and Planetary Sciences

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